Added query parameters to get paginated results

src/main/java/org/gcube/informationsystem/resourceregistry/api/request/BaseRequestInfo.java

@@ -0,0 +1,114 @@
+package org.gcube.informationsystem.resourceregistry.api.request;
+
+import org.gcube.informationsystem.base.reference.IdentifiableElement;
+import org.gcube.informationsystem.model.reference.properties.Metadata;
+
+/**
+ * @author Luca Frosini (ISTI - CNR)
+ */
+public class BaseRequestInfo implements RequestInfo {
+	
+	/**
+	 *  To get unlimited results the limit query parameters must be set to -1. 
+	 * 	If the results are too much the operation could have a timeout. 
+	 */
+	protected int limit;
+	
+	/**
+	 * The offset parameter indicates the starting position of the result.
+	 */
+	protected int offset;
+	
+	
+	/**
+	 * Track if the request requested to include {@link Metadata} 
+	 */
+	protected boolean includeMeta;
+	
+	/**
+	 * Track if the request requested to include {@link Metadata} in all
+	 * {@link IdentifiableElement} or just in the root instance 
+	 */
+	protected boolean allMeta;
+	
+	
+	/**
+	 * Track if hierarchicalMode has been requested 
+	 */
+	protected boolean hierarchicalMode;
+	
+	/**
+	 * Track if the request requested to include contexts 
+	 */	
+	protected boolean includeContexts;
+	
+	public BaseRequestInfo() {
+		this.limit = 10;
+		this.offset = 0;
+		this.includeMeta = false;
+		this.allMeta = false;
+		this.hierarchicalMode = false;
+		this.includeContexts = false;
+	}
+	
+	@Override
+	public int getLimit() {
+		return limit;
+	}
+
+	@Override
+	public void setLimit(int limit) {
+		this.limit = limit;
+	}
+
+	@Override
+	public int getOffset() {
+		return offset;
+	}
+
+	@Override
+	public void setOffset(int offset) {
+		this.offset = offset;
+	}
+
+	@Override
+	public boolean includeMeta() {
+		return includeMeta;
+	}
+
+	@Override
+	public void setIncludeMeta(boolean includeMeta) {
+		this.includeMeta = includeMeta;
+	}
+
+	@Override
+	public boolean allMeta() {
+		return allMeta;
+	}
+
+	@Override
+	public void setAllMeta(boolean allMeta) {
+		this.allMeta = allMeta;
+	}
+	
+	@Override
+	public boolean isHierarchicalMode() {
+		return hierarchicalMode;
+	}
+	
+	@Override
+	public void setHierarchicalMode(boolean hierarchicalMode) {
+		this.hierarchicalMode = hierarchicalMode;
+	}
+
+	@Override
+	public boolean includeContexts() {
+		return includeContexts;
+	}
+	
+	@Override
+	public void setIncludeContexts(boolean includeContexts) {
+		this.includeContexts = includeContexts;
+	}
+
+}

src/main/java/org/gcube/informationsystem/resourceregistry/api/request/RequestInfo.java

@@ -5,6 +5,14 @@ package org.gcube.informationsystem.resourceregistry.api.request;
  */
 public interface RequestInfo {
 
+	public int getLimit();
+
+	public void setLimit(int limit);
+
+	public int getOffset();
+
+	public void setOffset(int offset);
+
 	public boolean includeMeta();
 
 	public void setIncludeMeta(boolean includeMeta);

src/main/java/org/gcube/informationsystem/resourceregistry/api/rest/InstancePath.java

@@ -10,6 +10,10 @@ public class InstancePath {
 	
 	public static final String INSTANCES_PATH_PART = "instances";
 	
+	public static final String LIMIT_QUERY_PARAMETER = "limit";
+	
+	public static final String OFFSET_QUERY_PARAMETER = "offset";
+	
 	public static final String POLYMORPHIC_QUERY_PARAMETER = "polymorphic";
 	
 	public static final String HIERARCHICAL_MODE_QUERY_PARAMETER = "hierarchical";

src/main/java/org/gcube/informationsystem/resourceregistry/api/rest/QueryTemplatePath.java

@@ -8,6 +8,7 @@ public class QueryTemplatePath {
 	public static final String QUERY_TEMPLATES_PATH_PART = "query-templates";
 	
 	public static final String INCLUDE_META_QUERY_PARAMETER = InstancePath.INCLUDE_META_QUERY_PARAMETER;
+	
 	public static final String INCLUDE_META_IN_ALL_INSTANCES_QUERY_PARAMETER = InstancePath.INCLUDE_META_IN_ALL_INSTANCES_QUERY_PARAMETER;
 	
 }