information-system-model/src/main/java/org/gcube/informationsystem/types/impl/relations/RelationTypeDefinitionImpl.java

package org.gcube.informationsystem.types.impl.relations;

import java.io.StringWriter;
import java.lang.reflect.ParameterizedType;

import org.gcube.informationsystem.base.reference.entities.BaseEntity;
import org.gcube.informationsystem.base.reference.properties.Header;
import org.gcube.informationsystem.base.reference.relations.BaseRelation;
import org.gcube.informationsystem.context.reference.relations.IsParentOf;
import org.gcube.informationsystem.model.reference.entities.Facet;
import org.gcube.informationsystem.model.reference.entities.Resource;
import org.gcube.informationsystem.model.reference.relations.ConsistsOf;
import org.gcube.informationsystem.model.reference.relations.IsRelatedTo;
import org.gcube.informationsystem.model.reference.relations.Relation;
import org.gcube.informationsystem.types.TypeBinder;
import org.gcube.informationsystem.types.impl.TypeDefinitionImpl;
import org.gcube.informationsystem.types.reference.entities.EntityTypeDefinition;
import org.gcube.informationsystem.types.reference.relations.RelationTypeDefinition;
import org.gcube.informationsystem.utils.ISMapper;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonTypeName;

@JsonTypeName(value=RelationTypeDefinition.NAME)
public final class RelationTypeDefinitionImpl<ES extends EntityTypeDefinition<S>,  ET extends EntityTypeDefinition<T>, S extends BaseEntity, T extends BaseEntity>
		extends TypeDefinitionImpl implements RelationTypeDefinition<ES, ET, S,T> {

	/**
	 * Generated Serial Version UID
	 */
	private static final long serialVersionUID = 2221831081869571296L;
	
	// private static final String EDGE_CLASS_NAME   = "E";
	
	@JsonInclude(JsonInclude.Include.NON_NULL) 
	protected String sourceType;
	@JsonInclude(JsonInclude.Include.NON_NULL) 
	protected String targetType;
	
	protected RelationTypeDefinitionImpl() {
		super();
	}
	
	public RelationTypeDefinitionImpl(Class<? extends BaseRelation<S,T>> clz) {
		super(clz);
		
		if(IsRelatedTo.class.isAssignableFrom(clz)){
			@SuppressWarnings({"unchecked"})
			Class<? extends IsRelatedTo<? extends Resource, ? extends Resource>> c = (Class<? extends IsRelatedTo<? extends Resource, ? extends Resource>>) clz;
			this.superClasses = retrieveSuperClasses(c, IsRelatedTo.class, Relation.NAME);
		} else if(ConsistsOf.class.isAssignableFrom(clz)) {
			@SuppressWarnings({"unchecked"})
			Class<? extends ConsistsOf<? extends Resource, ? extends Facet>> c = (Class<? extends ConsistsOf<? extends Resource, ? extends Facet>>) clz;
			this.superClasses = retrieveSuperClasses(c, ConsistsOf.class, Relation.NAME);
		} else if(RelationTypeDefinition.class.isAssignableFrom(clz)){
			@SuppressWarnings({"unchecked", "rawtypes"})
			Class<? extends RelationTypeDefinition> c = (Class<? extends RelationTypeDefinition>) clz;
			this.superClasses = retrieveSuperClasses(c, RelationTypeDefinition.class, BaseRelation.NAME);
		} else if(IsParentOf.class.isAssignableFrom(clz)){
			@SuppressWarnings({"unchecked"})
			Class<? extends IsParentOf> c = (Class<? extends IsParentOf>) clz;
			this.superClasses = retrieveSuperClasses(c, IsParentOf.class, BaseRelation.NAME);
		} else if(BaseRelation.class.isAssignableFrom(clz)){
			this.superClasses = retrieveSuperClasses(clz, BaseRelation.class, null);
		} else {
			throw new RuntimeException("Type Hierachy Error");
		}
		
		java.lang.reflect.Type[] typeParameters = clz.getTypeParameters();
		if(typeParameters.length==0) {
			typeParameters = ((ParameterizedType) clz.getGenericInterfaces()[0]).getActualTypeArguments();
			@SuppressWarnings("unchecked")
			Class<S> sourceClass = (Class<S>) typeParameters[0];
			@SuppressWarnings("unchecked")
			Class<T> targetClass = (Class<T>) typeParameters[1];
			this.sourceType = TypeBinder.getType(sourceClass);
			this.targetType = TypeBinder.getType(targetClass);
		}else {
			@SuppressWarnings("unchecked")
			Class<S> sourceClass = (Class<S>) getGenericClass(typeParameters[0]);
			@SuppressWarnings("unchecked")
			Class<T> targetClass = (Class<T>) getGenericClass(typeParameters[1]);
			this.sourceType = TypeBinder.getType(sourceClass);
			this.targetType = TypeBinder.getType(targetClass);
		}
		
	}

	
	public String getSourceType() {
		return sourceType;
	}
	
	public String getTargetType() {
		return targetType;
	}
	
	
	/* 
	 * Java does not support multiple inheritance. 
	 * TypeDefinitionImpl is the superclass so that this class does not inherits the methods and field of BaseRelationImpl
	 * We need to copy them. 
	 */
	
	protected Header header;
	
	@Override
	public Header getHeader() {
		return header;
	}
	
	@Override
	public void setHeader(Header header){
		this.header = header;
	}
	
	@Override
	public String toString(){
		StringWriter stringWriter = new StringWriter();
		try {
			ISMapper.marshal(this, stringWriter);
			return stringWriter.toString();
		}catch(Exception e){
			try {
				ISMapper.marshal(this.header, stringWriter);
				return stringWriter.toString();
			} catch(Exception e1){
				return super.toString();
			}
		}
	}

	protected ES source;
	protected ET target;
	
	@Override
	public ES getSource() {
		return source;
	}


	@Override
	public void setSource(ES source) {
		this.source = source;
	}


	@Override
	public ET getTarget() {
		return target;
	}


	@Override
	public void setTarget(ET target) {
		this.target = target;
	}
	
}