Redesigning E/R instance definition

CHANGELOG.md

@@ -2,6 +2,11 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 # Changelog for Information System Model
 
+## [v7.0.0]
+
+- [#24992]
+
+
 ## [v6.0.0]
 
 - Modified models discovery to make it easier and more powerful [#24548]

pom.xml

@@ -10,7 +10,7 @@
 
 	<groupId>org.gcube.information-system</groupId>
 	<artifactId>information-system-model</artifactId>
-	<version>6.0.0</version>
+	<version>7.0.0-SNAPSHOT</version>
 	<name>Information System Model</name>
 	<description>Information System Model is the reference model of the gCube Information System</description>
 	<packaging>jar</packaging>
@@ -31,7 +31,7 @@
 			<dependency>
 				<groupId>org.gcube.distribution</groupId>
 				<artifactId>gcube-bom</artifactId>
-				<version>2.2.0</version>
+				<version>2.4.0-SNAPSHOT</version>
 				<type>pom</type>
 				<scope>import</scope>
 			</dependency>
@@ -62,6 +62,12 @@
 			<artifactId>authorization-utils</artifactId>
 			<version>[2.0.0, 3.0.0-SNAPSHOT)</version>
 			<scope>test</scope>
+			<exclusions>
+				<exclusion>
+					<groupId>org.slf4j</groupId>
+					<artifactId>slf4j-simple</artifactId>
+				</exclusion>
+			</exclusions>
 		</dependency>
 		<dependency>
 			<groupId>junit</groupId>

src/main/java/org/gcube/informationsystem/base/impl/entities/EntityElementImpl.java

@@ -1,11 +1,12 @@
 package org.gcube.informationsystem.base.impl.entities;
 
 import java.io.StringWriter;
+import java.util.UUID;
 
 import org.gcube.com.fasterxml.jackson.annotation.JsonTypeName;
 import org.gcube.informationsystem.base.impl.ElementImpl;
 import org.gcube.informationsystem.base.reference.entities.EntityElement;
-import org.gcube.informationsystem.model.reference.properties.Header;
+import org.gcube.informationsystem.model.reference.properties.Metadata;
 import org.gcube.informationsystem.serialization.ElementMapper;
 
 /**
@@ -19,20 +20,31 @@ public abstract class EntityElementImpl extends ElementImpl implements EntityEle
 	 */
 	private static final long serialVersionUID = -4488771434017342703L;
 	
-	protected Header header;
+	protected UUID uuid;
+	protected Metadata metadata;
 	
 	protected EntityElementImpl(){
 		super();
 	}
 	
 	@Override
-	public Header getHeader() {
+	public UUID getUUID() {
-		return header;
+		return uuid;
 	}
 
 	@Override
-	public void setHeader(Header header){
+	public void setUUID(UUID uuid) {
-		this.header = header;
+		this.uuid = uuid;
+	}
+	
+	@Override
+	public Metadata getMetadata() {
+		return metadata;
+	}
+	
+	@Override
+	public void setMetadata(Metadata metadata){
+		this.metadata = metadata;
 	}
 	
 	@Override
@@ -43,7 +55,7 @@ public abstract class EntityElementImpl extends ElementImpl implements EntityEle
 			return stringWriter.toString();
 		}catch(Exception e){
 			try {
-				ElementMapper.marshal(this.header, stringWriter);
+				ElementMapper.marshal(this.metadata, stringWriter);
 				return stringWriter.toString();
 			} catch(Exception e1){
 				return super.toString();

src/main/java/org/gcube/informationsystem/base/impl/relations/RelationElementImpl.java

@@ -1,10 +1,12 @@
 package org.gcube.informationsystem.base.impl.relations;
 
+import java.util.UUID;
+
 import org.gcube.com.fasterxml.jackson.annotation.JsonTypeName;
 import org.gcube.informationsystem.base.impl.ElementImpl;
 import org.gcube.informationsystem.base.reference.entities.EntityElement;
 import org.gcube.informationsystem.base.reference.relations.RelationElement;
-import org.gcube.informationsystem.model.reference.properties.Header;
+import org.gcube.informationsystem.model.reference.properties.Metadata;
 
 /**
  * @author Luca Frosini (ISTI - CNR)
@@ -17,7 +19,8 @@ public abstract class RelationElementImpl<S extends EntityElement, T extends Ent
 	 */
 	private static final long serialVersionUID = 28704968813390512L;
 	
-	protected Header header;
+	protected UUID uuid;
+	protected Metadata metadata;
 	
 	protected S source;
 	protected T target;
@@ -33,13 +36,23 @@ public abstract class RelationElementImpl<S extends EntityElement, T extends Ent
 	}
 	
 	@Override
-	public Header getHeader() {
+	public UUID getUUID() {
-		return header;
+		return uuid;
 	}
 
 	@Override
-	public void setHeader(Header header){
+	public void setUUID(UUID uuid) {
-		this.header = header;
+		this.uuid = uuid;
+	}
+	
+	@Override
+	public Metadata getMetadata() {
+		return metadata;
+	}
+	
+	@Override
+	public void setMetadata(Metadata metadata){
+		this.metadata = metadata;
 	}
 	
 	@Override

src/main/java/org/gcube/informationsystem/base/reference/IdentifiableElement.java

@@ -1,17 +1,24 @@
 package org.gcube.informationsystem.base.reference;
 
-import org.gcube.informationsystem.model.reference.properties.Header;
+import java.util.UUID;
+
+import org.gcube.informationsystem.model.reference.properties.Metadata;
 
 /**
- * This interfaces is an helper to identify elements could be identified via {@link Header}
+ * This interfaces is an helper to identify elements could be identified via {@link Metadata}
  * 
  * @author Luca Frosini (ISTI - CNR)
  */
 public interface IdentifiableElement extends Element {
 	
-	public static final String HEADER_PROPERTY = "header";
+	public static final String UUID_PROPERTY = "@uuid";
+	public static final String METADATA_PROPERTY = "@metadata";
 	
-	public Header getHeader();
+	public UUID getUUID();
 
-	public void setHeader(Header header);
+	public void setUUID(UUID uuid);
+	
+	public Metadata getMetadata();
+	
+	public void setMetadata(Metadata metadata);
 }

src/main/java/org/gcube/informationsystem/base/reference/entities/EntityElement.java

@@ -1,9 +1,11 @@
 package org.gcube.informationsystem.base.reference.entities;
 
+import java.util.UUID;
+
 import org.gcube.com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import org.gcube.informationsystem.base.reference.Element;
 import org.gcube.informationsystem.base.reference.IdentifiableElement;
-import org.gcube.informationsystem.model.reference.properties.Header;
+import org.gcube.informationsystem.model.reference.properties.Metadata;
 import org.gcube.informationsystem.types.annotations.Abstract;
 import org.gcube.informationsystem.types.annotations.ISProperty;
 import org.gcube.informationsystem.types.reference.Change;
@@ -22,9 +24,18 @@ public interface EntityElement extends Element, IdentifiableElement {
 	
 	public static final String NAME = "EntityElement"; //Entity.class.getSimpleName();
 
-	/* Overriding getHeader method to create Header property in type */
+	@ISProperty(name=METADATA_PROPERTY, mandatory=true, nullable=false, description="Metadata associated with the instance that is automatically created/updated by the system.")
-	@ISProperty(name=HEADER_PROPERTY, mandatory=true, nullable=false, description="Metadata associated with the instance that is automatically created/updated by the system.")
 	@Override
-	public Header getHeader();
+	public Metadata getMetadata();
+	
+	@Override
+	public void setMetadata(Metadata metadata);
+	
+	@ISProperty(name = UUID_PROPERTY, description = "This UUID is be used to identify the instance univocally.", readonly = true, mandatory = true, nullable = false)
+	@Override
+	public UUID getUUID();
+
+	@Override
+	public void setUUID(UUID uuid);
 	
 }

src/main/java/org/gcube/informationsystem/base/reference/relations/RelationElement.java

@@ -1,11 +1,13 @@
 package org.gcube.informationsystem.base.reference.relations;
 
+import java.util.UUID;
+
 import org.gcube.com.fasterxml.jackson.annotation.JsonGetter;
 import org.gcube.com.fasterxml.jackson.annotation.JsonIgnore;
 import org.gcube.informationsystem.base.reference.Element;
 import org.gcube.informationsystem.base.reference.IdentifiableElement;
 import org.gcube.informationsystem.base.reference.entities.EntityElement;
-import org.gcube.informationsystem.model.reference.properties.Header;
+import org.gcube.informationsystem.model.reference.properties.Metadata;
 import org.gcube.informationsystem.types.annotations.Abstract;
 import org.gcube.informationsystem.types.annotations.ISProperty;
 import org.gcube.informationsystem.types.reference.Change;
@@ -23,13 +25,22 @@ public interface RelationElement<S extends EntityElement, T extends EntityElemen
 	
 	public static final String NAME = "RelationElement"; // RelationElement.class.getSimpleName();
 	
-	public static final String SOURCE_PROPERTY = "source";
+	public static final String SOURCE_PROPERTY = "@source";
-	public static final String TARGET_PROPERTY = "target";
+	public static final String TARGET_PROPERTY = "@target";
 	
-	/* Overriding getHeader method to create Header property in type */
+	@ISProperty(name=METADATA_PROPERTY, mandatory=true, nullable=false, description="Metadata associated with the instance that is automatically created/updated by the system.")
-	@ISProperty(name = HEADER_PROPERTY, mandatory = true, nullable = false)
 	@Override
-	public Header getHeader();
+	public Metadata getMetadata();
+	
+	@Override
+	public void setMetadata(Metadata metadata);
+	
+	@ISProperty(name = UUID_PROPERTY, description = "This UUID is be used to identify the instance univocally.", readonly = true, mandatory = true, nullable = false)
+	@Override
+	public UUID getUUID();
+
+	@Override
+	public void setUUID(UUID uuid);
 	
 	@JsonGetter(value=SOURCE_PROPERTY)
 	public S getSource();

src/main/java/org/gcube/informationsystem/contexts/impl/entities/ContextImpl.java

@@ -14,7 +14,7 @@ import org.gcube.informationsystem.base.impl.entities.EntityElementImpl;
 import org.gcube.informationsystem.contexts.impl.relations.IsParentOfImpl;
 import org.gcube.informationsystem.contexts.reference.entities.Context;
 import org.gcube.informationsystem.contexts.reference.relations.IsParentOf;
-import org.gcube.informationsystem.model.impl.properties.HeaderImpl;
+import org.gcube.informationsystem.model.impl.properties.MetadataImpl;
 import org.gcube.informationsystem.utils.UUIDManager;
 
 /**
@@ -28,6 +28,7 @@ public final class ContextImpl extends EntityElementImpl implements Context {
 	 */
 	private static final long serialVersionUID = -5070590328223454087L;
 	
+	protected UUID uuid;
 	protected String name;
 	
 	protected IsParentOf parent;
@@ -39,6 +40,10 @@ public final class ContextImpl extends EntityElementImpl implements Context {
 		this.children = new ArrayList<>();
 	}
 	
+	public ContextImpl(UUID uuid) {
+		this(null, uuid);
+	}
+	
 	public ContextImpl(String name) {
 		this(name, null);
 	}
@@ -47,9 +52,23 @@ public final class ContextImpl extends EntityElementImpl implements Context {
 		this();
 		this.name = name;
 		if(uuid == null){
-			uuid = UUIDManager.generateValidRandomUUID();
+			uuid = UUIDManager.getInstance().generateValidRandomUUID();
 		}
-		this.header = new HeaderImpl(uuid);
+		this.uuid = uuid;
+		this.metadata = new MetadataImpl();
+	}
+	
+	/**
+	 * @return the uuid
+	 */
+	@Override
+	public UUID getUUID() {
+		return uuid;
+	}
+
+	@Override
+	public void setUUID(UUID uuid) {
+		this.uuid = uuid;
 	}
 	
 	@Override
@@ -72,8 +91,8 @@ public final class ContextImpl extends EntityElementImpl implements Context {
 	public void setParent(UUID uuid) {
 		Context parent = null;
 		if(uuid!=null) {
-			parent = new ContextImpl();
+			parent = new ContextImpl(uuid);
-			parent.setHeader(new HeaderImpl(uuid));
+			parent.setMetadata(new MetadataImpl());
 		}
 		setParent(parent);
 	}
@@ -121,8 +140,8 @@ public final class ContextImpl extends EntityElementImpl implements Context {
 	
 	@Override
 	public void addChild(UUID uuid) {
-		Context child = new ContextImpl();
+		Context child = new ContextImpl(uuid);
-		child.setHeader(new HeaderImpl(uuid));
+		child.setMetadata(new MetadataImpl());
 		addChild(child);
 	}
 	

src/main/java/org/gcube/informationsystem/model/impl/entities/DummyFacet.java

@@ -5,7 +5,7 @@ package org.gcube.informationsystem.model.impl.entities;
 
 import java.util.UUID;
 
-import org.gcube.informationsystem.model.impl.properties.HeaderImpl;
+import org.gcube.informationsystem.model.impl.properties.MetadataImpl;
 import org.gcube.informationsystem.model.reference.entities.Facet;
 import org.gcube.informationsystem.types.reference.Change;
 import org.gcube.informationsystem.types.reference.TypeMetadata;
@@ -25,7 +25,8 @@ public class DummyFacet extends FacetImpl implements Facet {
 	
 	public DummyFacet(UUID uuid) {
 		super();
-		this.header = new HeaderImpl(uuid);
+		this.uuid = uuid;
+		this.metadata = new MetadataImpl();
 	}
 
 	public DummyFacet(){

src/main/java/org/gcube/informationsystem/model/impl/entities/DummyResource.java

@@ -5,7 +5,7 @@ package org.gcube.informationsystem.model.impl.entities;
 
 import java.util.UUID;
 
-import org.gcube.informationsystem.model.impl.properties.HeaderImpl;
+import org.gcube.informationsystem.model.impl.properties.MetadataImpl;
 import org.gcube.informationsystem.model.reference.entities.Resource;
 import org.gcube.informationsystem.types.reference.Change;
 import org.gcube.informationsystem.types.reference.TypeMetadata;
@@ -25,7 +25,8 @@ public class DummyResource extends ResourceImpl implements Resource {
 
 	public DummyResource(UUID uuid){
 		super();
-		this.header = new HeaderImpl(uuid);
+		this.uuid = uuid;
+		this.metadata = new MetadataImpl();
 	}
 	
 	public DummyResource(){

src/main/java/org/gcube/informationsystem/model/impl/entities/EntityImpl.java

@@ -20,7 +20,7 @@ public abstract class EntityImpl extends EntityElementImpl implements Entity {
 	
 	protected EntityImpl(){
 		super();
-		this.header = null;
+		this.metadata = null;
 	}
 	
 }

src/main/java/org/gcube/informationsystem/model/impl/entities/ResourceImpl.java

@@ -177,14 +177,12 @@ public abstract class ResourceImpl extends EntityImpl implements Resource {
 			throw new RuntimeException(message);
 		}
 		
-		if (relation.getSource().getHeader()!= null &&
+		if (relation.getSource().getMetadata()!= null &&
-			relation.getSource().getHeader().getUUID() != null &&
+			relation.getSource().getUUID() != null &&
-			this.header !=null &&
+			this.metadata !=null &&
-			this.header.getUUID() != null &&
+			this.uuid != null &&
-			relation.getSource().getHeader().getUUID().compareTo(this.header.getUUID())!=0) {
+			relation.getSource().getUUID().compareTo(this.uuid)!=0) {
-			
 			throw new RuntimeException(message);
-
 		}
 		
 		if(relation.getSource()!=this){

src/main/java/org/gcube/informationsystem/model/impl/properties/EncryptedImpl.java

@@ -5,13 +5,13 @@ package org.gcube.informationsystem.model.impl.properties;
 
 import org.gcube.com.fasterxml.jackson.annotation.JsonIgnore;
 import org.gcube.com.fasterxml.jackson.annotation.JsonTypeName;
-import org.gcube.informationsystem.model.reference.properties.Vault;
+import org.gcube.informationsystem.model.reference.properties.Encrypted;
 
 /**
  * @author Luca Frosini (ISTI - CNR)
  */
-@JsonTypeName(value = Vault.NAME)
+@JsonTypeName(value = Encrypted.NAME)
-public class VaultImpl extends PropertyImpl implements Vault {
+public class EncryptedImpl extends PropertyImpl implements Encrypted {
 	
 	/**
 	 * Generated Serial Version UID
@@ -21,7 +21,7 @@ public class VaultImpl extends PropertyImpl implements Vault {
 	@JsonIgnore
 	protected String value;
 	
-	public VaultImpl() {
+	public EncryptedImpl() {
 		super();
 	}
 	

src/main/java/org/gcube/informationsystem/model/impl/properties/MetadataImpl.java

@@ -4,49 +4,30 @@
 package org.gcube.informationsystem.model.impl.properties;
 
 import java.util.Date;
-import java.util.UUID;
 
 import org.gcube.com.fasterxml.jackson.annotation.JsonTypeName;
-import org.gcube.informationsystem.model.reference.properties.Header;
+import org.gcube.informationsystem.model.reference.properties.Metadata;
 
 /**
  * @author Luca Frosini (ISTI - CNR)
  */
-@JsonTypeName(value=Header.NAME)
+@JsonTypeName(value=Metadata.NAME)
-public final class HeaderImpl extends PropertyImpl implements Header {
+public final class MetadataImpl extends PropertyImpl implements Metadata {
 
 	/**
 	 * Generated Serial Version UID
 	 */
 	private static final long serialVersionUID = 5102553511155113169L;
 
-	protected UUID uuid;
 	protected String createdBy;
 	protected Date creationTime;
 	protected String lastUpdateBy;
 	protected Date lastUpdateTime;
 
-	public HeaderImpl() {
+	public MetadataImpl() {
 		super();
 	}
 
-	public HeaderImpl(UUID uuid) {
-		this.uuid = uuid;
-	}
-
-	/**
-	 * @return the uuid
-	 */
-	@Override
-	public UUID getUUID() {
-		return uuid;
-	}
-
-	@Override
-	public void setUUID(UUID uuid) {
-		this.uuid = uuid;
-	}
-
 	@Override
 	public String getCreatedBy() {
 		return createdBy;

src/main/java/org/gcube/informationsystem/model/reference/properties/Encrypted.java

@@ -3,7 +3,7 @@ package org.gcube.informationsystem.model.reference.properties;
 import org.gcube.com.fasterxml.jackson.annotation.JsonGetter;
 import org.gcube.com.fasterxml.jackson.annotation.JsonSetter;
 import org.gcube.com.fasterxml.jackson.databind.annotation.JsonDeserialize;
-import org.gcube.informationsystem.model.impl.properties.VaultImpl;
+import org.gcube.informationsystem.model.impl.properties.EncryptedImpl;
 import org.gcube.informationsystem.types.annotations.ISProperty;
 import org.gcube.informationsystem.types.reference.Change;
 import org.gcube.informationsystem.types.reference.TypeMetadata;
@@ -12,12 +12,12 @@ import org.gcube.informationsystem.utils.Version;
 /**
  * @author Luca Frosini (ISTI - CNR)
  */
-@JsonDeserialize(as=VaultImpl.class)
+@JsonDeserialize(as=EncryptedImpl.class)
-@TypeMetadata(name = Vault.NAME, description = "This type is used to properly manage values must be stored safely (e.g. encrypted) in the IS.", version = Version.MINIMAL_VERSION_STRING)
+@TypeMetadata(name = Encrypted.NAME, description = "This type is used to properly manage values must be stored safely (e.g. encrypted) in the IS.", version = Version.MINIMAL_VERSION_STRING)
 @Change(version = Version.MINIMAL_VERSION_STRING, description = Version.MINIMAL_VERSION_DESCRIPTION)
-public interface Vault extends Property {
+public interface Encrypted extends Property {
 	
-	public static final String NAME = "Vault"; // Vault.class.getSimpleName();
+	public static final String NAME = "Encrypted"; // Encrypted.class.getSimpleName();
 	
 	public static final String VALUE = "value";
 	

src/main/java/org/gcube/informationsystem/model/reference/properties/Metadata.java

@@ -4,12 +4,11 @@
 package org.gcube.informationsystem.model.reference.properties;
 
 import java.util.Date;
-import java.util.UUID;
 
 import org.gcube.com.fasterxml.jackson.annotation.JsonFormat;
 import org.gcube.com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import org.gcube.informationsystem.base.reference.Element;
-import org.gcube.informationsystem.model.impl.properties.HeaderImpl;
+import org.gcube.informationsystem.model.impl.properties.MetadataImpl;
 import org.gcube.informationsystem.types.annotations.Final;
 import org.gcube.informationsystem.types.annotations.ISProperty;
 import org.gcube.informationsystem.types.reference.Change;
@@ -17,31 +16,28 @@ import org.gcube.informationsystem.types.reference.TypeMetadata;
 import org.gcube.informationsystem.utils.Version;
 
 /**
- * https://wiki.gcube-system.org/gcube/Facet_Based_Resource_Model#Header
- * 
  * @author Luca Frosini (ISTI - CNR)
  */
-@JsonDeserialize(as=HeaderImpl.class)
+@JsonDeserialize(as=MetadataImpl.class)
-@TypeMetadata(name = Header.NAME, description = "This type provides metadata per every IdentifiableElement", version = Version.MINIMAL_VERSION_STRING)
+@TypeMetadata(name = Metadata.NAME, description = "This type provides metadata per every IdentifiableElement", version = Version.MINIMAL_VERSION_STRING)
 @Change(version = Version.MINIMAL_VERSION_STRING, description = Version.MINIMAL_VERSION_DESCRIPTION)
 @Final
-public interface Header extends Property {
+public interface Metadata extends Property {
 
-	public static final String NAME = "Header"; // Header.class.getSimpleName();
+	public static final String NAME = "Metadata"; // Metadata.class.getSimpleName();
 
 	/**
 	 * Used to set Creator when the user is not known
 	 */
 	public static final String UNKNOWN_USER = "UNKNOWN_USER";
 
-	public static final String UUID_PROPERTY = "uuid";
 	public static final String CREATED_BY_PROPERTY = "createdBy";
 	public static final String CREATION_TIME_PROPERTY = "creationTime";
 	public static final String LAST_UPDATE_BY_PROPERTY = "lastUpdateBy";
 	public static final String LAST_UPDATE_TIME_PROPERTY = "lastUpdateTime";
 
 	/**
-	 * Used when requested to include contexts in header.
+	 * Used when requested to include contexts in metadata.
 	 * This is not a native property (it is just generated by server for administration clients convenience)
 	 */
 	public static final String __CONTEXTS = "contexts";
@@ -60,9 +56,4 @@ public interface Header extends Property {
 	@ISProperty(name = LAST_UPDATE_TIME_PROPERTY, description = "Last Update time. At creation time it assumes the same value of " + CREATION_TIME_PROPERTY + ". It is represented in the format " + Element.DATETIME_PATTERN, mandatory = true, nullable = false)
 	public Date getLastUpdateTime();
 	
-	@ISProperty(name = UUID_PROPERTY, description = "This UUID is be used to identify the Entity or the Relation univocally.", readonly = true, mandatory = true, nullable = false)
-	public UUID getUUID();
-
-	public void setUUID(UUID uuid);
-	
 }

src/main/java/org/gcube/informationsystem/model/reference/relations/Relation.java

@@ -37,7 +37,7 @@ public interface Relation<S extends Resource, T extends Entity> extends Relation
 	
 	public static final String NAME = "Relation"; //Relation.class.getSimpleName();
 	
-	public static final String PROPAGATION_CONSTRAINT_PROPERTY = "propagationConstraint";
+	public static final String PROPAGATION_CONSTRAINT_PROPERTY = "@propagationConstraint";
 	
 	@JsonIgnoreProperties({Resource.CONSISTS_OF_PROPERTY, Resource.IS_RELATED_TO_PROPERTY})
 	@JsonGetter(value = SOURCE_PROPERTY)

src/main/java/org/gcube/informationsystem/types/impl/TypeImpl.java

@@ -8,6 +8,7 @@ import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
 import java.util.TreeSet;
+import java.util.UUID;
 
 import org.gcube.com.fasterxml.jackson.annotation.JsonGetter;
 import org.gcube.com.fasterxml.jackson.annotation.JsonIgnore;
@@ -20,7 +21,7 @@ import org.gcube.informationsystem.base.reference.Element;
 import org.gcube.informationsystem.base.reference.entities.EntityElement;
 import org.gcube.informationsystem.base.reference.properties.PropertyElement;
 import org.gcube.informationsystem.base.reference.relations.RelationElement;
-import org.gcube.informationsystem.model.reference.properties.Header;
+import org.gcube.informationsystem.model.reference.properties.Metadata;
 import org.gcube.informationsystem.types.TypeMapper;
 import org.gcube.informationsystem.types.annotations.Abstract;
 import org.gcube.informationsystem.types.annotations.Final;
@@ -57,8 +58,8 @@ public class TypeImpl implements Type {
 		DEFAULT_CHANGELOG_MAP_KEY_AS_STRING.put(Version.MINIMAL_VERSION_STRING, Version.MINIMAL_VERSION_DESCRIPTION);
 	}
 	
-	
+	protected UUID uuid;
-	protected Header header;
+	protected Metadata metadata;
 
 	protected String name;
 	protected String description;
@@ -188,13 +189,23 @@ public class TypeImpl implements Type {
 	}
 	
 	@Override
-	public Header getHeader() {
+	public UUID getUUID() {
-		return header;
+		return uuid;
 	}
 
 	@Override
-	public void setHeader(Header header) {
+	public void setUUID(UUID uuid) {
-		this.header = header;
+		this.uuid = uuid;
+	}
+	
+	@Override
+	public Metadata getMetadata() {
+		return metadata;
+	}
+
+	@Override
+	public void setMetadata(Metadata metadata) {
+		this.metadata = metadata;
 	}
 
 	@Override

src/main/java/org/gcube/informationsystem/types/impl/entities/EntityTypeImpl.java

@@ -11,7 +11,7 @@ import org.gcube.informationsystem.base.reference.entities.EntityElement;
 import org.gcube.informationsystem.contexts.reference.entities.Context;
 import org.gcube.informationsystem.model.reference.entities.Facet;
 import org.gcube.informationsystem.model.reference.entities.Resource;
-import org.gcube.informationsystem.model.reference.properties.Header;
+import org.gcube.informationsystem.model.reference.properties.Metadata;
 import org.gcube.informationsystem.queries.templates.reference.entities.QueryTemplate;
 import org.gcube.informationsystem.serialization.ElementMapper;
 import org.gcube.informationsystem.types.impl.TypeImpl;
@@ -91,16 +91,16 @@ public class EntityTypeImpl extends TypeImpl implements EntityType {
 	 * We need to copy them. 
 	 */
 	
-	protected Header header;
+	protected Metadata metadata;
 	
 	@Override
-	public Header getHeader() {
+	public Metadata getMetadata() {
-		return header;
+		return metadata;
 	}
 	
 	@Override
-	public void setHeader(Header header){
+	public void setMetadata(Metadata metadata){
-		this.header = header;
+		this.metadata = metadata;
 	}
 	
 	@Override
@@ -111,7 +111,7 @@ public class EntityTypeImpl extends TypeImpl implements EntityType {
 			return stringWriter.toString();
 		}catch(Exception e){
 			try {
-				ElementMapper.marshal(this.header, stringWriter);
+				ElementMapper.marshal(this.metadata, stringWriter);
 				return stringWriter.toString();
 			} catch(Exception e1){
 				return super.toString();

src/main/java/org/gcube/informationsystem/types/impl/properties/PropertyTypeImpl.java

@@ -83,7 +83,7 @@ public final class PropertyTypeImpl<P extends PropertyElement> extends TypeImpl
 			return stringWriter.toString();
 		}catch(Exception e){
 			try {
-				ElementMapper.marshal(this.header, stringWriter);
+				ElementMapper.marshal(this.metadata, stringWriter);
 				return stringWriter.toString();
 			} catch(Exception e1){
 				return super.toString();

src/main/java/org/gcube/informationsystem/types/impl/relations/RelationTypeImpl.java

@@ -167,7 +167,7 @@ public class RelationTypeImpl<S extends EntityType, T extends EntityType>
 			return stringWriter.toString();
 		}catch(Exception e){
 			try {
-				ElementMapper.marshal(this.header, stringWriter);
+				ElementMapper.marshal(this.metadata, stringWriter);
 				return stringWriter.toString();
 			} catch(Exception e1){
 				return super.toString();

src/main/java/org/gcube/informationsystem/types/reference/properties/PropertyType.java

@@ -6,7 +6,7 @@ import org.gcube.com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import org.gcube.com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import org.gcube.informationsystem.base.reference.IdentifiableElement;
 import org.gcube.informationsystem.base.reference.properties.PropertyElement;
-import org.gcube.informationsystem.model.reference.properties.Header;
+import org.gcube.informationsystem.model.reference.properties.Metadata;
 import org.gcube.informationsystem.types.annotations.Final;
 import org.gcube.informationsystem.types.annotations.ISProperty;
 import org.gcube.informationsystem.types.impl.properties.PropertyTypeImpl;
@@ -27,10 +27,10 @@ public interface PropertyType<P extends PropertyElement> extends PropertyElement
 	
 	public static final String NAME = "PropertyType"; // PropertyTypeDefinition.class.getSimpleName();
 	
-	@ISProperty(name=IdentifiableElement.HEADER_PROPERTY, mandatory=true, nullable=false)
+	@ISProperty(name=IdentifiableElement.METADATA_PROPERTY, mandatory=true, nullable=false)
-	public Header getHeader();
+	public Metadata getMetadata();
 	
-	public void setHeader(Header header);
+	public void setMetadata(Metadata metadata);
 	
 	/* TypeDefinition is just a Java useful class. The type is not created in the IS. Hence the fields must be redefined */
 	

src/main/java/org/gcube/informationsystem/utils/UUIDManager.java

@@ -10,8 +10,17 @@ import java.util.UUID;
  */
 public final class UUIDManager {
 
-	public static final Set<String> RESERVED_UUID_STRING;
+	private static final Set<String> RESERVED_UUID_STRING;
-	public static final Set<UUID> RESERVED_UUID;
+	private static final Set<UUID> RESERVED_UUID;
+	
+	private static UUIDManager uuidManager;
+	
+	public static UUIDManager getInstance() {
+		if(uuidManager==null) {
+			uuidManager = new UUIDManager();
+		}
+		return uuidManager;
+	}
 	
 	private UUIDManager() {
 		
@@ -31,27 +40,29 @@ public final class UUIDManager {
 		}
 	}
 	
-	public static boolean isReservedUUID(UUID uuid) {
+	public boolean isReservedUUID(UUID uuid) {
 		return RESERVED_UUID.contains(uuid);
 	}
 	
-	public static boolean isReservedUUID(String uuid) {
+	public boolean isReservedUUID(String uuid) {
 		return RESERVED_UUID_STRING.contains(uuid);
 	}
 	
-	public static Set<String> getAllReservedUUIDAsStrings(){
+	public Set<String> getAllReservedUUIDAsStrings(){
 		return new TreeSet<>(RESERVED_UUID_STRING);
 	}
 	
-	public static Set<UUID> getAllReservedUUID(){
+	public Set<UUID> getAllReservedUUID(){
 		return new TreeSet<>(RESERVED_UUID);
 	}
 	
-	public static UUID generateValidRandomUUID() {
+	public UUID generateValidRandomUUID() {
 		UUID generated = UUID.randomUUID();
 		while(RESERVED_UUID.contains(generated)) {
 			generated = UUID.randomUUID();
 		}
 		return generated;
 	}
+	
+	
 }

src/main/java/org/gcube/informationsystem/utils/Utility.java

@@ -9,8 +9,7 @@ import java.util.UUID;
 import org.gcube.com.fasterxml.jackson.core.JsonProcessingException;
 import org.gcube.com.fasterxml.jackson.databind.JsonNode;
 import org.gcube.com.fasterxml.jackson.databind.ObjectMapper;
-import org.gcube.informationsystem.model.reference.entities.Entity;
+import org.gcube.informationsystem.base.reference.IdentifiableElement;
-import org.gcube.informationsystem.model.reference.properties.Header;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -22,14 +21,13 @@ public class Utility {
 	private static Logger logger = LoggerFactory.getLogger(Utility.class);
 	
 	public static UUID getUUIDFromJsonNode(JsonNode jsonNode){
-		JsonNode header = jsonNode.get(Entity.HEADER_PROPERTY);
+		UUID uuid = UUID.fromString(jsonNode.get(IdentifiableElement.UUID_PROPERTY).asText());
-		UUID uuid = UUID.fromString(header.get(Header.UUID_PROPERTY).asText());
 		logger.trace("UUID got from {} is : {} ", jsonNode.toString(), uuid);
 		return uuid;
 	}
 	
 	public static UUID getUUIDFromJSONString(String json) throws JsonProcessingException, IOException {
-		logger.trace("Trying to get UUID from {} of {} ", Header.class.getSimpleName(), json);
+		logger.trace("Trying to get UUID of {} ", json);
 		JsonNode jsonNode = getJSONNode(json);
 		return getUUIDFromJsonNode(jsonNode);
 	}

src/test/java/org/gcube/informationsystem/ContextTest.java

@@ -15,7 +15,7 @@ import org.gcube.common.authorization.utils.secret.SecretUtility;
 import org.gcube.common.keycloak.KeycloakClientFactory;
 import org.gcube.common.keycloak.model.TokenResponse;
 import org.gcube.common.scope.api.ScopeProvider;
-import org.gcube.informationsystem.model.reference.properties.Header;
+import org.gcube.informationsystem.model.reference.properties.Metadata;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.slf4j.Logger;
@@ -112,7 +112,7 @@ public class ContextTest {
 	}
 	
 	public static String getUser() {
-		String user = Header.UNKNOWN_USER;
+		String user = Metadata.UNKNOWN_USER;
 		try {
 			user = SecretManagerProvider.instance.get().getUser().getUsername();
 		} catch(Exception e) {

src/test/java/org/gcube/informationsystem/model/impl/properties/HeaderTest.java

@@ -1,67 +0,0 @@
-package org.gcube.informationsystem.model.impl.properties;
-
-import java.io.IOException;
-import java.util.Calendar;
-import java.util.Date;
-import java.util.List;
-import java.util.UUID;
-
-import org.gcube.com.fasterxml.jackson.core.JsonParseException;
-import org.gcube.com.fasterxml.jackson.databind.JsonMappingException;
-import org.gcube.informationsystem.model.reference.properties.Header;
-import org.gcube.informationsystem.model.reference.properties.Property;
-import org.gcube.informationsystem.serialization.ElementMapper;
-import org.junit.Assert;
-import org.junit.Test;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-/**
- * @author Luca Frosini (ISTI - CNR)
- */
-public class HeaderTest {
-
-	private static Logger logger = LoggerFactory.getLogger(HeaderTest.class);
-	
-	@Test
-	public void headerTest() throws Exception {
-		HeaderImpl header = new HeaderImpl(UUID.randomUUID());
-		Date date = Calendar.getInstance().getTime();
-		header.creationTime = date;
-		header.lastUpdateTime = date;
-		header.createdBy = Header.UNKNOWN_USER;
-		
-		String json = ElementMapper.marshal(header);
-		logger.debug(json);
-		
-		
-		Property property = ElementMapper.unmarshal(Property.class, json);
-		Assert.assertTrue(property instanceof Header);
-		Assert.assertTrue(((Header) property).getCreationTime().compareTo(date)==0);
-		Assert.assertTrue(((Header) property).getLastUpdateTime().compareTo(date)==0);
-		logger.debug(ElementMapper.marshal(property));
-		
-		Header h  = ElementMapper.unmarshal(Header.class, json);
-		Assert.assertTrue(property instanceof Header);
-		Assert.assertTrue(h.getCreationTime().compareTo(date)==0);
-		Assert.assertTrue(h.getLastUpdateTime().compareTo(date)==0);
-		logger.debug(ElementMapper.marshal(h));
-	}
-	
-	@Test
-	public void testContextsInHeader() throws JsonParseException, JsonMappingException, IOException {
-		
-		String headerJson = "{\"@class\":\"Header\",\"uuid\":\"cee84aaf-030c-4170-b554-836e7df3f611\",\"creator\":\"UNKNOWN_USER\",\"modifiedBy\":null,\"creationTime\":\"2020-11-09 10:01:25.415 +0000\",\"lastUpdateTime\":\"2020-11-09 10:01:25.415 +0000\",\"contexts\":[\"167114e0-9027-4e9e-83af-57973a8f8f08\",\"bad5f350-345c-11e9-9f49-cef9b1608c3f\"]}";
-		
-		Property property = ElementMapper.unmarshal(Property.class, headerJson);
-		logger.debug("{}", property);
-		
-		Header h  = ElementMapper.unmarshal(Header.class, headerJson);
-		logger.debug("{}", h);
-		
-		@SuppressWarnings("unchecked")
-		List<String> contexts = (List<String>) h.getAdditionalProperty(Header.__CONTEXTS);
-		logger.debug("Contexts UUIDs are {}", contexts);
-	}
-
-}

src/test/java/org/gcube/informationsystem/model/impl/properties/MetadataTest.java

@@ -0,0 +1,77 @@
+package org.gcube.informationsystem.model.impl.properties;
+
+import java.io.IOException;
+import java.util.Calendar;
+import java.util.Date;
+import java.util.Map;
+
+import org.gcube.com.fasterxml.jackson.core.JsonParseException;
+import org.gcube.com.fasterxml.jackson.databind.JsonMappingException;
+import org.gcube.informationsystem.model.reference.properties.Metadata;
+import org.gcube.informationsystem.model.reference.properties.Property;
+import org.gcube.informationsystem.serialization.ElementMapper;
+import org.junit.Assert;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * @author Luca Frosini (ISTI - CNR)
+ */
+public class MetadataTest {
+
+	private static Logger logger = LoggerFactory.getLogger(MetadataTest.class);
+	
+	@Test
+	public void metadataTest() throws Exception {
+		MetadataImpl metadata = new MetadataImpl();
+		Date date = Calendar.getInstance().getTime();
+		metadata.creationTime = date;
+		metadata.lastUpdateTime = date;
+		metadata.createdBy = Metadata.UNKNOWN_USER;
+		metadata.lastUpdateBy = Metadata.UNKNOWN_USER;
+		
+		String json = ElementMapper.marshal(metadata);
+		logger.debug(json);
+		
+		
+		Property property = ElementMapper.unmarshal(Property.class, json);
+		Assert.assertTrue(property instanceof Metadata);
+		Assert.assertTrue(((Metadata) property).getCreationTime().compareTo(date)==0);
+		Assert.assertTrue(((Metadata) property).getLastUpdateTime().compareTo(date)==0);
+		logger.debug(ElementMapper.marshal(property));
+		
+		Metadata h  = ElementMapper.unmarshal(Metadata.class, json);
+		Assert.assertTrue(property instanceof Metadata);
+		Assert.assertTrue(h.getCreationTime().compareTo(date)==0);
+		Assert.assertTrue(h.getLastUpdateTime().compareTo(date)==0);
+		logger.debug(ElementMapper.marshal(h));
+	}
+	
+	@Test
+	public void testContextsInMetadata() throws JsonParseException, JsonMappingException, IOException {
+		
+		String metadataJson = 
+		"{"
+			+ "\"@class\":\"Metadata\","
+			+ "\"createdBy\":\"UNKNOWN_USER\","
+			+ "\"lastUpdateBy\":\"UNKNOWN_USER\","
+			+ "\"creationTime\":\"2020-11-09 10:01:25.415 +0000\","
+			+ "\"lastUpdateTime\":\"2020-11-09 10:01:25.415 +0000\","
+			+ "\"contexts\": {"
+				+ "\"bad5f350-345c-11e9-9f49-cef9b1608c3f\": \"/gcube/devNext/NextNext\""
+			+ "}"
+		+ "}";
+		
+		Property property = ElementMapper.unmarshal(Property.class, metadataJson);
+		logger.debug("{}", property);
+		
+		Metadata h  = ElementMapper.unmarshal(Metadata.class, metadataJson);
+		logger.debug("{}", h);
+		
+		@SuppressWarnings("unchecked")
+		Map<String,String> contexts = (Map<String, String>) h.getAdditionalProperty(Metadata.__CONTEXTS);
+		logger.debug("Contexts UUIDs are {}", contexts);
+	}
+
+}

src/test/java/org/gcube/informationsystem/model/impl/properties/PropagationConstraintTest.java

@@ -1,7 +1,6 @@
 package org.gcube.informationsystem.model.impl.properties;
 
 import java.util.Calendar;
-import java.util.UUID;
 
 import org.gcube.informationsystem.base.reference.Element;
 import org.gcube.informationsystem.model.reference.entities.Facet;
@@ -116,48 +115,38 @@ public class PropagationConstraintTest {
 		"}";
 		logger.debug(pcString);
 		
-		HeaderImpl header = new HeaderImpl();
+		MetadataImpl metadata = new MetadataImpl();
-		header.setUUID(UUID.randomUUID());
+		metadata.createdBy = "luca.frosini";
-		header.createdBy = "luca.frosini";
+		metadata.lastUpdateBy = "luca.frosini";
-		header.lastUpdateBy = "luca.frosini";
+		metadata.creationTime = Calendar.getInstance().getTime();
-		header.creationTime = Calendar.getInstance().getTime();
+		metadata.lastUpdateTime = Calendar.getInstance().getTime();
-		header.lastUpdateTime = Calendar.getInstance().getTime();
 		
-		String hString = ElementMapper.marshal(header);
+		String hString = ElementMapper.marshal(metadata);
 		
 		
 		String consistsOfString = "{" +
 			"\"" + Element.CLASS_PROPERTY + "\":\"" + ConsistsOf.NAME + "\"," +
 			"\"" + ConsistsOf.PROPAGATION_CONSTRAINT_PROPERTY + "\":"+ pcString + "," +
-			"\"" + ConsistsOf.HEADER_PROPERTY + "\": " + hString + "," +
+			"\"" + ConsistsOf.METADATA_PROPERTY + "\": " + hString + "," +
 			"\"" + ConsistsOf.SOURCE_PROPERTY + "\":{" +
+				"\"@uuid\":\"4a971915-ca90-48cf-9975-63ee2dd28605\"," +
 				"\"@class\":\"MyEService\"," +
 				"\"@superClasses\":[\"EService\", \"Service\", \"Resource\"]," +
-				"\"header\":"+ "{" +
+				"\"" + ConsistsOf.METADATA_PROPERTY + "\": " + hString +
-					"\"@class\":\"Header\"," +
-					"\"uuid\":\"4a971915-ca90-48cf-9975-63ee2dd28605\"," +
-					"\"creator\":null, " +
-					"\"creationTime\":null, " +
-					"\"lastUpdateTime\":null}" + 
 				"}," +
 			"\"" + ConsistsOf.TARGET_PROPERTY + "\":{" +
+				"\"@uuid\":\"3ace4bd0-e5cd-49a3-97a8-a0a9468ce6d4\"," +
 				"\"@class\":\"MySoftwareFacet\"," +
 				"\"@superClasses\":[\"SoftwareFacet\", \"Facet\"]," +
-				"\"header\":"+ "{" +
+				"\"" + ConsistsOf.METADATA_PROPERTY + "\": " + hString + "," + 
-					"\"@class\":\"Header\"," +
+				"\"name\":\"WhnManager\"," +
-					"\"uuid\":\"3ace4bd0-e5cd-49a3-97a8-a0a9468ce6d4\"," +
-					"\"creator\":null, " +
-					"\"creationTime\":null, " +
-					"\"lastUpdateTime\":null" +
-				"}" + 
-				",\"name\":\"WhnManager\"," +
 				"\"group\":\"VREManagement\"," +
 				"\"version\":\"2.0.0-SNAPSHOT\"," +
 				"\"description\":\"Web Hosting Node Service\"," +
 				"\"qualifier\":null,\"optional\":false" +
 			"}" + 
 		"}";
-		logger.debug(consistsOfString);
+		logger.debug("--- {}", consistsOfString);
 		
 		@SuppressWarnings("unchecked")
 		ConsistsOf<Resource,Facet> consistsOf = ElementMapper.unmarshal(ConsistsOf.class, consistsOfString);

src/test/java/org/gcube/informationsystem/types/EntitySchemaDefinition.java

@@ -6,7 +6,7 @@ package org.gcube.informationsystem.types;
 import org.gcube.informationsystem.base.reference.Element;
 import org.gcube.informationsystem.base.reference.properties.PropertyElement;
 import org.gcube.informationsystem.model.reference.entities.Resource;
-import org.gcube.informationsystem.model.reference.properties.Header;
+import org.gcube.informationsystem.model.reference.properties.Metadata;
 import org.gcube.informationsystem.model.reference.relations.IsRelatedTo;
 import org.junit.Test;
 import org.slf4j.Logger;
@@ -21,7 +21,7 @@ public class EntitySchemaDefinition {
 
 	@Test
 	public void test() throws Exception {
-		Class<? extends PropertyElement> clz = Header.class;
+		Class<? extends PropertyElement> clz = Metadata.class;
 		String json = TypeMapper.serializeType(clz);
 		logger.trace(json);
 	}

src/test/java/org/gcube/informationsystem/types/SerializationTest.java

@@ -8,10 +8,10 @@ import org.gcube.informationsystem.contexts.reference.relations.IsParentOf;
 import org.gcube.informationsystem.model.reference.entities.Entity;
 import org.gcube.informationsystem.model.reference.entities.Facet;
 import org.gcube.informationsystem.model.reference.entities.Resource;
-import org.gcube.informationsystem.model.reference.properties.Header;
+import org.gcube.informationsystem.model.reference.properties.Metadata;
 import org.gcube.informationsystem.model.reference.properties.PropagationConstraint;
 import org.gcube.informationsystem.model.reference.properties.Property;
-import org.gcube.informationsystem.model.reference.properties.Vault;
+import org.gcube.informationsystem.model.reference.properties.Encrypted;
 import org.gcube.informationsystem.model.reference.relations.ConsistsOf;
 import org.gcube.informationsystem.model.reference.relations.IsRelatedTo;
 import org.gcube.informationsystem.model.reference.relations.Relation;
@@ -89,9 +89,9 @@ public class SerializationTest {
 		logger.info(ElementMapper.marshal(property));
 		
 		@SuppressWarnings("unchecked")
-		PropertyType<Header> header = (PropertyType<Header>) TypeMapper.createTypeDefinition(Header.class);
+		PropertyType<Metadata> metadataType = (PropertyType<Metadata>) TypeMapper.createTypeDefinition(Metadata.class);
-		Assert.assertTrue(header.getAccessType()==AccessType.PROPERTY);
+		Assert.assertTrue(metadataType.getAccessType()==AccessType.PROPERTY);
-		logger.info(ElementMapper.marshal(header));
+		logger.info(ElementMapper.marshal(metadataType));
 		
 		@SuppressWarnings("unchecked")
 		PropertyType<PropagationConstraint> propagationConstraint = (PropertyType<PropagationConstraint>) TypeMapper.createTypeDefinition(PropagationConstraint.class);
@@ -99,7 +99,7 @@ public class SerializationTest {
 		logger.info(ElementMapper.marshal(propagationConstraint));
 		
 		@SuppressWarnings("unchecked")
-		PropertyType<Vault> vault = (PropertyType<Vault>) TypeMapper.createTypeDefinition(Vault.class);
+		PropertyType<Encrypted> vault = (PropertyType<Encrypted>) TypeMapper.createTypeDefinition(Encrypted.class);
 		Assert.assertTrue(vault.getAccessType()==AccessType.PROPERTY);
 		logger.info(ElementMapper.marshal(vault));
 		
@@ -198,19 +198,19 @@ public class SerializationTest {
 	
 	@Test
 	public void testTypeSerialization() throws Exception {
-		String serialized = TypeMapper.serializeType(Header.class);
+		String serialized = TypeMapper.serializeType(Metadata.class);
 		logger.info(serialized);
 		@SuppressWarnings("unchecked")
-		PropertyType<Header> propertyType = (PropertyType<Header>) TypeMapper.deserializeTypeDefinition(serialized);
+		PropertyType<Metadata> propertyType = (PropertyType<Metadata>) TypeMapper.deserializeTypeDefinition(serialized);
 		Version typeVersion = propertyType.getVersion();
 		logger.debug("Version {}", typeVersion.toString());
 		logger.info(ElementMapper.marshal(propertyType));
 		
-		String json = "{\"@class\":\"PropertyType\",\"header\":null,\"name\":\"Header\",\"description\":\"This class provides metadata per every IdentifiableElement\",\"superClasses\":[\"Property\"],\"properties\":[{\"@class\":\"PropertyDefinition\",\"name\":\"creationTime\",\"description\":\"Creation time. It represents the difference, measured in milliseconds, between the creation time and midnight, January 1, 1970, UTC.\",\"mandatory\":true,\"readonly\":true,\"notnull\":true,\"max\":null,\"min\":null,\"regexp\":null,\"type\":\"Date\"},{\"@class\":\"PropertyDefinition\",\"name\":\"lastUpdateTime\",\"description\":\"Last Update time. At creation time it assumes the same value of creationTime. It represents the difference, measured in milliseconds, between the creation time and midnight, January 1, 1970, UTC.\",\"mandatory\":true,\"readonly\":false,\"notnull\":true,\"max\":null,\"min\":null,\"regexp\":null,\"type\":\"Date\"},{\"@class\":\"PropertyDefinition\",\"name\":\"createdBy\",\"description\":\"The user that created the Entity or the Relation. It is initialized at creation time. \",\"mandatory\":true,\"readonly\":true,\"notnull\":true,\"max\":null,\"min\":null,\"regexp\":null,\"type\":\"String\"},{\"@class\":\"PropertyDefinition\",\"name\":\"uuid\",\"description\":\"This UUID is be used to identify the Entity or the Relation univocally.\",\"mandatory\":true,\"readonly\":true,\"notnull\":true,\"max\":null,\"min\":null,\"regexp\":\"^([a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}){1}$\",\"type\":\"String\"},{\"@class\":\"PropertyDefinition\",\"name\":\"lastUpdateBy\",\"description\":\"The user that made the last update to the Entity or the Relation. At creation time, it assumes the same value of creator.\",\"mandatory\":true,\"readonly\":false,\"notnull\":true,\"max\":null,\"min\":null,\"regexp\":null,\"type\":\"String\"}],\"accessType\":\"PROPERTY\",\"abstract\":false,\"version\":\"1.0.0\",\"changelog\":{\"1.0.0\":\"First Version\"}}";
+		String json = "{\"@class\":\"PropertyType\",\"metadata\":null,\"name\":\"Metadata\",\"description\":\"This class provides metadata per every IdentifiableElement\",\"superClasses\":[\"Property\"],\"properties\":[{\"@class\":\"PropertyDefinition\",\"name\":\"creationTime\",\"description\":\"Creation time. It represents the difference, measured in milliseconds, between the creation time and midnight, January 1, 1970, UTC.\",\"mandatory\":true,\"readonly\":true,\"notnull\":true,\"max\":null,\"min\":null,\"regexp\":null,\"type\":\"Date\"},{\"@class\":\"PropertyDefinition\",\"name\":\"lastUpdateTime\",\"description\":\"Last Update time. At creation time it assumes the same value of creationTime. It represents the difference, measured in milliseconds, between the creation time and midnight, January 1, 1970, UTC.\",\"mandatory\":true,\"readonly\":false,\"notnull\":true,\"max\":null,\"min\":null,\"regexp\":null,\"type\":\"Date\"},{\"@class\":\"PropertyDefinition\",\"name\":\"createdBy\",\"description\":\"The user that created the Entity or the Relation. It is initialized at creation time. \",\"mandatory\":true,\"readonly\":true,\"notnull\":true,\"max\":null,\"min\":null,\"regexp\":null,\"type\":\"String\"},{\"@class\":\"PropertyDefinition\",\"name\":\"uuid\",\"description\":\"This UUID is be used to identify the Entity or the Relation univocally.\",\"mandatory\":true,\"readonly\":true,\"notnull\":true,\"max\":null,\"min\":null,\"regexp\":\"^([a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}){1}$\",\"type\":\"String\"},{\"@class\":\"PropertyDefinition\",\"name\":\"lastUpdateBy\",\"description\":\"The user that made the last update to the Entity or the Relation. At creation time, it assumes the same value of creator.\",\"mandatory\":true,\"readonly\":false,\"notnull\":true,\"max\":null,\"min\":null,\"regexp\":null,\"type\":\"String\"}],\"accessType\":\"PROPERTY\",\"abstract\":false,\"version\":\"1.0.0\",\"changelog\":{\"1.0.0\":\"First Version\"}}";
 		logger.info(json);
 		@SuppressWarnings("unchecked")
-		PropertyType<Header> headerType = (PropertyType<Header>) TypeMapper.deserializeTypeDefinition(json);
+		PropertyType<Metadata> metadataType = (PropertyType<Metadata>) TypeMapper.deserializeTypeDefinition(json);
-		logger.info(ElementMapper.marshal(headerType));
+		logger.info(ElementMapper.marshal(metadataType));
 		
 	}
 	

src/test/java/org/gcube/informationsystem/types/TypeNameTest.java

@@ -1,7 +1,7 @@
 package org.gcube.informationsystem.types;
 
-import org.gcube.informationsystem.model.reference.properties.Header;
+import org.gcube.informationsystem.model.reference.properties.Metadata;
-import org.gcube.informationsystem.model.reference.properties.Vault;
+import org.gcube.informationsystem.model.reference.properties.Encrypted;
 import org.gcube.informationsystem.types.PropertyTypeName.BaseType;
 import org.junit.Assert;
 import org.junit.Test;
@@ -17,7 +17,7 @@ public class TypeNameTest {
 	
 	@Test
 	public void getBaseType() throws Exception {
-		Class<?> clz = Header.class;
+		Class<?> clz = Metadata.class;
 		BaseType baseType = PropertyTypeName.getBaseTypeByClass(clz);
 		logger.debug("{} for class {} is {}", BaseType.class.getSimpleName(), clz, baseType);
 	}
@@ -63,7 +63,7 @@ public class TypeNameTest {
 			if(baseType.ordinal()>=BaseType.PROPERTY.ordinal()) {
 				if(baseType == BaseType.PROPERTY) {
 					stringBuffer = new StringBuffer();
-					stringBuffer.append(Vault.NAME);
+					stringBuffer.append(Encrypted.NAME);
 					checkPropertyTypeName(stringBuffer.toString(), baseType);
 				} else {
 					for(BaseType b : BaseType.values()) {
@@ -79,7 +79,7 @@ public class TypeNameTest {
 						}
 						
 						if(b == BaseType.PROPERTY) {
-							sb.append(Vault.NAME);
+							sb.append(Encrypted.NAME);
 						} else {
 							sb.append(b.toString());
 						}

src/test/java/org/gcube/informationsystem/utils/UUIDManagerTest.java

@@ -14,21 +14,23 @@ public class UUIDManagerTest {
 	
 	@Test
 	public void testReservedUUID() {
-		Set<UUID> allUUID = UUIDManager.getAllReservedUUID();
+		UUIDManager uuidManager = UUIDManager.getInstance();
+		
+		Set<UUID> allUUID = uuidManager.getAllReservedUUID();
 		logger.debug("Reserved UUIDs are {}", allUUID);
 		
-		Set<String> allUUIDAsString = UUIDManager.getAllReservedUUIDAsStrings();
+		Set<String> allUUIDAsString = uuidManager.getAllReservedUUIDAsStrings();
 		Assert.assertTrue(allUUID.size()==allUUIDAsString.size());
 		Assert.assertTrue(allUUID.size()==16);
 		Assert.assertTrue(allUUIDAsString.size()==16);
 		for(UUID uuid : allUUID) {
-			Assert.assertTrue(UUIDManager.isReservedUUID(uuid));
+			Assert.assertTrue(uuidManager.isReservedUUID(uuid));
-			Assert.assertTrue(UUIDManager.isReservedUUID(uuid.toString()));
+			Assert.assertTrue(uuidManager.isReservedUUID(uuid.toString()));
 		}
 		
 		for(String uuidString : allUUIDAsString) {
-			Assert.assertTrue(UUIDManager.isReservedUUID(UUID.fromString(uuidString)));
+			Assert.assertTrue(uuidManager.isReservedUUID(UUID.fromString(uuidString)));
-			Assert.assertTrue(UUIDManager.isReservedUUID(uuidString));
+			Assert.assertTrue(uuidManager.isReservedUUID(uuidString));
 		}
 		
 	}

src/test/resources/logback-test.xml

@@ -10,7 +10,7 @@
   
   
   <logger name="org.gcube" level="WARN" />
-  <logger name="org.gcube.informationsystem" level="INFO" />
+  <logger name="org.gcube.informationsystem" level="TRACE" />
   <logger name="org.gcube.informationsystem.resourceregistry.dbinitialization" level="WARN" />
   
   <root level="WARN">