/*******************************************************************************
 * Copyright (c) 2006, 2008 Oracle. All rights reserved.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0, which accompanies this distribution
 * and is available at http://www.eclipse.org/legal/epl-v10.html.
 * 
 * Contributors:
 *     Oracle - initial API and implementation
 ******************************************************************************/
package org.eclipse.jpt.core.internal.context.orm;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import org.eclipse.jpt.core.JpaStructureNode;
import org.eclipse.jpt.core.JptCorePlugin;
import org.eclipse.jpt.core.MappingKeys;
import org.eclipse.jpt.core.context.AccessType;
import org.eclipse.jpt.core.context.PersistentAttribute;
import org.eclipse.jpt.core.context.PersistentType;
import org.eclipse.jpt.core.context.PersistentTypeContext;
import org.eclipse.jpt.core.context.java.JavaAttributeMapping;
import org.eclipse.jpt.core.context.java.JavaPersistentAttribute;
import org.eclipse.jpt.core.context.java.JavaPersistentType;
import org.eclipse.jpt.core.context.orm.OrmAttributeMapping;
import org.eclipse.jpt.core.context.orm.OrmEmbeddable;
import org.eclipse.jpt.core.context.orm.OrmEntity;
import org.eclipse.jpt.core.context.orm.OrmMappedSuperclass;
import org.eclipse.jpt.core.context.orm.OrmPersistentAttribute;
import org.eclipse.jpt.core.context.orm.OrmPersistentType;
import org.eclipse.jpt.core.context.orm.OrmPersistentTypeContext;
import org.eclipse.jpt.core.context.orm.OrmStructureNodes;
import org.eclipse.jpt.core.context.orm.OrmTypeMapping;
import org.eclipse.jpt.core.context.orm.OrmTypeMappingProvider;
import org.eclipse.jpt.core.internal.context.AbstractXmlContextNode;
import org.eclipse.jpt.core.resource.orm.AbstractXmlTypeMapping;
import org.eclipse.jpt.core.resource.orm.Attributes;
import org.eclipse.jpt.core.resource.orm.OrmFactory;
import org.eclipse.jpt.core.resource.orm.XmlAttributeMapping;
import org.eclipse.jpt.core.resource.orm.XmlEmbeddable;
import org.eclipse.jpt.core.resource.orm.XmlEntity;
import org.eclipse.jpt.core.resource.orm.XmlMappedSuperclass;
import org.eclipse.jpt.core.utility.TextRange;
import org.eclipse.jpt.utility.internal.CollectionTools;
import org.eclipse.jpt.utility.internal.iterators.ChainIterator;
import org.eclipse.jpt.utility.internal.iterators.CloneListIterator;
import org.eclipse.jpt.utility.internal.iterators.CompositeIterator;
import org.eclipse.jpt.utility.internal.iterators.CompositeListIterator;
import org.eclipse.jpt.utility.internal.iterators.EmptyListIterator;
import org.eclipse.jpt.utility.internal.iterators.FilteringIterator;
import org.eclipse.jpt.utility.internal.iterators.TransformationIterator;
import org.eclipse.wst.validation.internal.provisional.core.IMessage;

public class GenericOrmPersistentType
	extends AbstractXmlContextNode
	implements OrmPersistentType
{
	protected final List<OrmPersistentAttribute> specifiedPersistentAttributes;

	protected final List<OrmPersistentAttribute> virtualPersistentAttributes;

	protected final Collection<OrmTypeMappingProvider> typeMappingProviders;

	protected OrmTypeMapping ormTypeMapping;
	
	protected PersistentType parentPersistentType;
	
	
	public GenericOrmPersistentType(PersistentTypeContext parent, String mappingKey) {
		super(parent);
		this.typeMappingProviders = buildTypeMappingProviders();
		this.ormTypeMapping = buildOrmTypeMapping(mappingKey);
		this.specifiedPersistentAttributes = new ArrayList<OrmPersistentAttribute>();
		this.virtualPersistentAttributes = new ArrayList<OrmPersistentAttribute>();
	}
	
	
	//***************** PersistentType implementation **************************
	
	public OrmPersistentTypeContext getContext() {
		return (OrmPersistentTypeContext) getParent();
	}
	
	public String getId() {
		return OrmStructureNodes.PERSISTENT_TYPE_ID;
	}

	public boolean isFor(String fullyQualifiedTypeName) {
		String className = getMapping().getClass_();
		if (className == null) {
			return false;
		}
		if (className.equals(fullyQualifiedTypeName)) {
			return true;
		}
		if ((getContext().getDefaultPersistentTypePackage() + '.' +  className).equals(fullyQualifiedTypeName)) {
			return true;
		}
		return false;
	}
	
	protected OrmTypeMapping buildOrmTypeMapping(String key) {
		return getTypeMappingProvider(key).buildMapping(this, getJpaFactory());
	}

	protected Collection<OrmTypeMappingProvider> buildTypeMappingProviders() {
		Collection<OrmTypeMappingProvider> collection = new ArrayList<OrmTypeMappingProvider>();
		collection.add(new OrmEntityProvider());
		collection.add(new OrmMappedSuperclassProvider());
		collection.add(new OrmEmbeddableProvider());
		return collection;
	}

	protected OrmTypeMappingProvider getTypeMappingProvider(String key) {
		for (OrmTypeMappingProvider provider : this.typeMappingProviders) {
			if (provider.getKey().equals(key)) {
				return provider;
			}
		}
		throw new IllegalArgumentException();
	}

	public OrmTypeMapping getMapping() {
		return this.ormTypeMapping;
	}

	public void setMappingKey(String newMappingKey) {
		if (this.getMappingKey() == newMappingKey) {
			return;
		}
		OrmTypeMapping oldMapping = getMapping();
		this.ormTypeMapping = buildOrmTypeMapping(newMappingKey);
		getContext().changeMapping(this, oldMapping, this.ormTypeMapping);
		firePropertyChanged(MAPPING_PROPERTY, oldMapping, this.ormTypeMapping);
	}
	
	protected void setMappingKey_(String newMappingKey) {
		if (this.getMappingKey() == newMappingKey) {
			return;
		}
		OrmTypeMapping oldMapping = getMapping();
		this.ormTypeMapping = buildOrmTypeMapping(newMappingKey);
		firePropertyChanged(MAPPING_PROPERTY, oldMapping, this.ormTypeMapping);
	}

	public Iterator<PersistentType> inheritanceHierarchy() {
		// using a chain iterator to traverse up the inheritance tree
		return new ChainIterator<PersistentType>(this) {
			@Override
			protected PersistentType nextLink(PersistentType pt) {
				return pt.getParentPersistentType();
			}
		};
	}

	public Iterator<PersistentType> ancestors() {
		// using a chain iterator to traverse up the inheritance tree
		return new ChainIterator<PersistentType>(this.getParentPersistentType()) {
			@Override
			protected PersistentType nextLink(PersistentType pt) {
				return pt.getParentPersistentType();
			}
		};
	}

	public PersistentType getParentPersistentType() {
		return this.parentPersistentType;
	}
	
	public void setParentPersistentType(PersistentType newParentPersistentType) {
		if (attributeValueHasNotChanged(this.parentPersistentType, newParentPersistentType)) {
			return;
		}
		PersistentType oldParentPersistentType = this.parentPersistentType;
		this.parentPersistentType = newParentPersistentType;
		firePropertyChanged(PersistentType.PARENT_PERSISTENT_TYPE_PROPERTY, oldParentPersistentType, newParentPersistentType);
	}

	public AccessType getAccess() {
		return getMapping().getAccess();
	}
	
	public void changeMapping(OrmPersistentAttribute ormPersistentAttribute, OrmAttributeMapping oldMapping, OrmAttributeMapping newMapping) {
		int sourceIndex = this.specifiedPersistentAttributes.indexOf(ormPersistentAttribute);
		this.specifiedPersistentAttributes.remove(sourceIndex);
		oldMapping.removeFromResourceModel(this.ormTypeMapping.getResourceTypeMapping());
		int targetIndex = insertionIndex(ormPersistentAttribute);
		this.specifiedPersistentAttributes.add(targetIndex, ormPersistentAttribute);
		newMapping.addToResourceModel(getMapping().getResourceTypeMapping());
		oldMapping.initializeOn(newMapping);
		fireItemMoved(SPECIFIED_ATTRIBUTES_LIST, targetIndex, sourceIndex);
	}

	public void makePersistentAttributeVirtual(OrmPersistentAttribute ormPersistentAttribute) {
		if (ormPersistentAttribute.isVirtual()) {
			throw new IllegalStateException("Attribute is already virtual"); //$NON-NLS-1$
		}
		JavaPersistentAttribute javaPersistentAttribute = ormPersistentAttribute.getMapping().getJavaPersistentAttribute();
		OrmPersistentAttribute virtualPersistentAttribute = null;
		if (javaPersistentAttribute != null) {
			virtualPersistentAttribute = buildVirtualOrmPersistentAttribute(javaPersistentAttribute);
			this.virtualPersistentAttributes.add(virtualPersistentAttribute);
		}
		this.removeSpecifiedPersistentAttribute(ormPersistentAttribute);
		if (virtualPersistentAttribute != null) {
			fireItemAdded(VIRTUAL_ATTRIBUTES_LIST, virtualAttributesSize() - 1, virtualPersistentAttribute);
		}
	}
	
	public void makePersistentAttributeSpecified(OrmPersistentAttribute ormPersistentAttribute) {
		makePersistentAttributeSpecified(ormPersistentAttribute, ormPersistentAttribute.getMappingKey());		
	}

	public void makePersistentAttributeSpecified(OrmPersistentAttribute ormPersistentAttribute, String mappingKey) {
		if (!ormPersistentAttribute.isVirtual()) {
			throw new IllegalStateException("Attribute is already specified"); //$NON-NLS-1$
		}
		if (mappingKey == MappingKeys.NULL_ATTRIBUTE_MAPPING_KEY) {
			throw new IllegalStateException("Use makePersistentAttributeSpecified(OrmPersistentAttribute, String) instead and specify a mapping type"); //$NON-NLS-1$
		}
			
		OrmPersistentAttribute newPersistentAttribute = buildOrmPersistentAttribute(mappingKey);
		if (getMapping().getResourceTypeMapping().getAttributes() == null) {
			getMapping().getResourceTypeMapping().setAttributes(createAttributesResource());
		}
		int insertionIndex = insertionIndex(newPersistentAttribute);
		this.specifiedPersistentAttributes.add(insertionIndex, newPersistentAttribute);
		newPersistentAttribute.getMapping().addToResourceModel(getMapping().getResourceTypeMapping());
		
		int removalIndex = this.virtualPersistentAttributes.indexOf(ormPersistentAttribute);
		this.virtualPersistentAttributes.remove(ormPersistentAttribute);
		newPersistentAttribute.getSpecifiedMapping().setName(ormPersistentAttribute.getName());
		
		fireItemAdded(PersistentType.SPECIFIED_ATTRIBUTES_LIST, insertionIndex, newPersistentAttribute);
		fireItemRemoved(VIRTUAL_ATTRIBUTES_LIST, removalIndex, ormPersistentAttribute);
	}

	protected Attributes createAttributesResource() {
		return OrmFactory.eINSTANCE.createAttributes();
	}
	
	public Iterator<String> allAttributeNames() {
		return this.attributeNames(this.allAttributes());
	}

	public Iterator<PersistentAttribute> allAttributes() {
		return new CompositeIterator<PersistentAttribute>(new TransformationIterator<PersistentType, Iterator<PersistentAttribute>>(this.inheritanceHierarchy()) {
			@Override
			protected Iterator<PersistentAttribute> transform(PersistentType pt) {
				return pt.attributes();
			}
		});
	}

	protected Iterator<OrmPersistentAttribute> attributesNamed(final String attributeName) {
		return new FilteringIterator<OrmPersistentAttribute, OrmPersistentAttribute>(attributes()) {
			@Override
			protected boolean accept(OrmPersistentAttribute o) {
				if (attributeName == null && o.getName() == null) {
					return true;
				}
				if (attributeName != null && attributeName.equals(o.getName())) {
					return true;
				}
				return false;
			}
		};
	}

	public OrmPersistentAttribute getAttributeNamed(String attributeName) {
		Iterator<OrmPersistentAttribute> stream = attributesNamed(attributeName);
		return (stream.hasNext()) ? stream.next() : null;
	}

	public Iterator<String> attributeNames() {
		return this.attributeNames(this.attributes());
	}
	
	protected Iterator<String> attributeNames(Iterator<? extends PersistentAttribute> attrs) {
		return new TransformationIterator<PersistentAttribute, String>(attrs) {
			@Override
			protected String transform(PersistentAttribute attribute) {
				return attribute.getName();
			}
		};
	}

	protected OrmPersistentAttribute specifiedAttributeNamed(String attributeName) {
		Iterator<OrmPersistentAttribute> stream = specifiedAttributesNamed(attributeName);
		return (stream.hasNext()) ? stream.next() : null;
		
	}
	
	protected Iterator<OrmPersistentAttribute> specifiedAttributesNamed(final String attributeName) {
		return new FilteringIterator<OrmPersistentAttribute, OrmPersistentAttribute>(specifiedAttributes()) {
			@Override
			protected boolean accept(OrmPersistentAttribute ormPersistentAttribute) {
				return attributeName.equals(ormPersistentAttribute.getName());
			}
		};
	}

	@SuppressWarnings("unchecked")
	public ListIterator<OrmPersistentAttribute> attributes() {
		return new CompositeListIterator<OrmPersistentAttribute>(specifiedAttributes(), virtualAttributes());
	}

	public int attributesSize() {
		return specifiedAttributesSize() + virtualAttributesSize();
	}
	
	public ListIterator<OrmPersistentAttribute> specifiedAttributes() {
		return new CloneListIterator<OrmPersistentAttribute>(this.specifiedPersistentAttributes);
	}
	
	public int specifiedAttributesSize() {
		return this.specifiedPersistentAttributes.size();
	}
	
	public ListIterator<OrmPersistentAttribute> virtualAttributes() {
		return new CloneListIterator<OrmPersistentAttribute>(this.virtualPersistentAttributes);		
	}
	
	public int virtualAttributesSize() {
		return this.virtualPersistentAttributes.size();
	}
	
	protected void addVirtualPersistentAttribute(OrmPersistentAttribute ormPersistentAttribute) {
		addItemToList(ormPersistentAttribute, this.virtualPersistentAttributes, OrmPersistentType.VIRTUAL_ATTRIBUTES_LIST);
	}

	protected void removeVirtualPersistentAttribute(OrmPersistentAttribute ormPersistentAttribute) {
		removeItemFromList(ormPersistentAttribute, this.virtualPersistentAttributes, OrmPersistentType.VIRTUAL_ATTRIBUTES_LIST);
	}
	
	protected void moveVirtualPersistentAttribute_(int index, OrmPersistentAttribute attribute) {
		moveItemInList(index, this.virtualPersistentAttributes.indexOf(attribute), this.virtualPersistentAttributes, OrmPersistentType.VIRTUAL_ATTRIBUTES_LIST);
	}

	public boolean containsVirtualPersistentAttribute(OrmPersistentAttribute ormPersistentAttribute) {
		return this.virtualPersistentAttributes.contains(ormPersistentAttribute);
	}
	
	public OrmPersistentAttribute addSpecifiedPersistentAttribute(String mappingKey, String attributeName) {
		OrmPersistentAttribute persistentAttribute = buildOrmPersistentAttribute(mappingKey);
		int index = insertionIndex(persistentAttribute);
		if (getMapping().getResourceTypeMapping().getAttributes() == null) {
			getMapping().getResourceTypeMapping().setAttributes(createAttributesResource());
		}
		this.specifiedPersistentAttributes.add(index, persistentAttribute);
		persistentAttribute.getMapping().addToResourceModel(getMapping().getResourceTypeMapping());
		
		persistentAttribute.getSpecifiedMapping().setName(attributeName);
		fireItemAdded(PersistentType.SPECIFIED_ATTRIBUTES_LIST, index, persistentAttribute);
		return persistentAttribute;
	}

	protected int insertionIndex(OrmPersistentAttribute persistentAttribute) {
		return CollectionTools.insertionIndexOf(this.specifiedPersistentAttributes, persistentAttribute, buildMappingComparator());
	}

	protected Comparator<OrmPersistentAttribute> buildMappingComparator() {
		return new Comparator<OrmPersistentAttribute>() {
			public int compare(OrmPersistentAttribute o1, OrmPersistentAttribute o2) {
				int o1Sequence = o1.getMapping().getXmlSequence();
				int o2Sequence = o2.getMapping().getXmlSequence();
				if (o1Sequence < o2Sequence) {
					return -1;
				}
				if (o1Sequence == o2Sequence) {
					return 0;
				}
				return 1;
			}
		};
	}

	
	protected void addSpecifiedPersistentAttribute_(OrmPersistentAttribute ormPersistentAttribute) {
		addItemToList(ormPersistentAttribute, this.specifiedPersistentAttributes, PersistentType.SPECIFIED_ATTRIBUTES_LIST);
	}

	protected void removeSpecifiedPersistentAttribute_(OrmPersistentAttribute ormPersistentAttribute) {
		removeItemFromList(ormPersistentAttribute, this.specifiedPersistentAttributes, PersistentType.SPECIFIED_ATTRIBUTES_LIST);
	}
	
	protected void moveSpecifiedPersistentAttribute_(int index, OrmPersistentAttribute attribute) {
		moveItemInList(index, this.specifiedPersistentAttributes.indexOf(attribute), this.specifiedPersistentAttributes, PersistentType.SPECIFIED_ATTRIBUTES_LIST);
	}

	public void removeSpecifiedPersistentAttribute(OrmPersistentAttribute ormPersistentAttribute) {
		int index = this.specifiedPersistentAttributes.indexOf(ormPersistentAttribute);
		this.specifiedPersistentAttributes.remove(ormPersistentAttribute);
		ormPersistentAttribute.getMapping().removeFromResourceModel(this.ormTypeMapping.getResourceTypeMapping());
		if (this.ormTypeMapping.getResourceTypeMapping().getAttributes().isAllFeaturesUnset()) {
			this.ormTypeMapping.getResourceTypeMapping().setAttributes(null);
		}
		fireItemRemoved(PersistentType.SPECIFIED_ATTRIBUTES_LIST, index, ormPersistentAttribute);		
	}

	public String getName() {
		return getMapping().getClass_();
	}
	
	public String getShortName(){
		return getName().substring(getName().lastIndexOf('.') + 1);
	}

	public void classChanged(String oldClass, String newClass) {
		firePropertyChanged(NAME_PROPERTY, oldClass, newClass);
	}

	public boolean isMapped() {
		return true;
	}

	public String getMappingKey() {
		return getMapping().getKey();
	}
	
	public JavaPersistentType getJavaPersistentType() {
		return getMapping().getJavaPersistentType();
	}
	
	
	//TODO is there a way to avoid a method for every mapping type?
	//I am trying to take adavantage of generics here, but it sure is
	//leading to a lot of duplicated code. - KFM
	public void initialize(XmlEntity entity) {
		((OrmEntity) getMapping()).initialize(entity);
		this.initializeParentPersistentType();	
		this.initializePersistentAttributes(entity);
	}
	
	public void initialize(XmlMappedSuperclass mappedSuperclass) {
		((OrmMappedSuperclass) getMapping()).initialize(mappedSuperclass);
		this.initializeParentPersistentType();
		this.initializePersistentAttributes(mappedSuperclass);
	}
		
	public void initialize(XmlEmbeddable embeddable) {
		((OrmEmbeddable) getMapping()).initialize(embeddable);
		this.initializeParentPersistentType();		
		this.initializePersistentAttributes(embeddable);
	}
	
	protected void initializePersistentAttributes(AbstractXmlTypeMapping typeMapping) {
		this.initializeSpecifiedPersistentAttributes(typeMapping.getAttributes());
		this.initializeVirtualPersistentAttributes();
	}
	
	protected OrmPersistentAttribute buildOrmPersistentAttribute(String mappingKey) {
		return getJpaFactory().buildOrmPersistentAttribute(this, mappingKey);
	}
	
	protected void initializeSpecifiedPersistentAttributes(Attributes attributes) {
		if (attributes == null) {
			return;
		}
		for (XmlAttributeMapping resourceMapping : attributes.getAttributeMappings()) {
			OrmPersistentAttribute ormPersistentAttribute = buildOrmPersistentAttribute(resourceMapping.getMappingKey());
			ormPersistentAttribute.initialize(resourceMapping);
			this.specifiedPersistentAttributes.add(ormPersistentAttribute);
		}
	}
	
	protected void initializeVirtualPersistentAttributes() {
		ListIterator<JavaPersistentAttribute> javaAttributes = javaPersistentAttributes();
		
		while (javaAttributes.hasNext()) {
			JavaPersistentAttribute javaPersistentAttribute = javaAttributes.next();
			if (specifiedAttributeNamed(javaPersistentAttribute.getName()) == null) {
				OrmPersistentAttribute ormPersistentAttribute = buildVirtualOrmPersistentAttribute(javaPersistentAttribute);
				this.virtualPersistentAttributes.add(ormPersistentAttribute);
			}
		}
	}
	
	protected ListIterator<JavaPersistentAttribute> javaPersistentAttributes() {
		JavaPersistentType javaPersistentType = getJavaPersistentType();
		if (javaPersistentType != null) {
			return javaPersistentType.attributes();
		}
		return EmptyListIterator.instance();
	}

	protected void initializeParentPersistentType() {
		JavaPersistentType javaPersistentType = getJavaPersistentType();
		if (javaPersistentType != null) {
			this.parentPersistentType = javaPersistentType.getParentPersistentType();
		}
	}

	public void update(XmlEntity entity) {
		//TODO remove this just like I did in GenericOrmPersistentAttribute
		if (getMappingKey() != MappingKeys.ENTITY_TYPE_MAPPING_KEY) {
			setMappingKey_(MappingKeys.ENTITY_TYPE_MAPPING_KEY);
		}
		((OrmEntity) getMapping()).update(entity);
		this.updateParentPersistentType();
		this.updatePersistentAttributes(entity);
	}
	
	public void update(XmlMappedSuperclass mappedSuperclass) {
		if (getMappingKey() != MappingKeys.MAPPED_SUPERCLASS_TYPE_MAPPING_KEY) {
			setMappingKey_(MappingKeys.MAPPED_SUPERCLASS_TYPE_MAPPING_KEY);
		}
		((OrmMappedSuperclass) getMapping()).update(mappedSuperclass);
		this.updateParentPersistentType();
		this.updatePersistentAttributes(mappedSuperclass);
	}
	
	public void update(XmlEmbeddable embeddable) {
		if (getMappingKey() != MappingKeys.EMBEDDABLE_TYPE_MAPPING_KEY) {
			setMappingKey_(MappingKeys.EMBEDDABLE_TYPE_MAPPING_KEY);
		}
		((OrmEmbeddable) getMapping()).update(embeddable);
		this.updateParentPersistentType();
		this.updatePersistentAttributes(embeddable);
	}
	
	protected void updateParentPersistentType() {
		JavaPersistentType javaPersistentType = getJavaPersistentType();
		setParentPersistentType(javaPersistentType == null ? null : javaPersistentType.getParentPersistentType());
	}
	
	protected void updatePersistentAttributes(AbstractXmlTypeMapping typeMapping) {
		this.updateSpecifiedPersistentAttributes(typeMapping.getAttributes());
		this.updateVirtualPersistentAttributes();
	}

	protected void updateSpecifiedPersistentAttributes(Attributes attributes) {
		Collection<OrmPersistentAttribute> contextAttributesToRemove = CollectionTools.collection(specifiedAttributes());
		Collection<OrmPersistentAttribute> contextAttributesToUpdate = new ArrayList<OrmPersistentAttribute>();
		int resourceIndex = 0;
		
		if (attributes != null) {
			for (XmlAttributeMapping resourceMapping : attributes.getAttributeMappings()) {
				boolean contextAttributeFound = false;
				for (OrmPersistentAttribute contextAttribute : contextAttributesToRemove) {
					if (contextAttribute.getMapping().getResourceAttributeMapping() == resourceMapping) {
						moveSpecifiedPersistentAttribute_(resourceIndex, contextAttribute);
						contextAttributesToRemove.remove(contextAttribute);
						contextAttributesToUpdate.add(contextAttribute);
						contextAttributeFound = true;
						break;
					}
				}
				if (!contextAttributeFound) {
					OrmPersistentAttribute ormPersistentAttribute = buildOrmPersistentAttribute(resourceMapping.getMappingKey());
					ormPersistentAttribute.initialize(resourceMapping);
					addSpecifiedPersistentAttribute_(ormPersistentAttribute);
				}
				resourceIndex++;
			}
		}
		for (OrmPersistentAttribute contextAttribute : contextAttributesToRemove) {
			removeSpecifiedPersistentAttribute_(contextAttribute);
		}
		//first handle adding/removing of the persistent attributes, then update the others last, 
		//this causes less churn in the update process
		for (OrmPersistentAttribute contextAttribute : contextAttributesToUpdate) {
			contextAttribute.update();
		}	
	}
	
	//TODO move this to Attributes, so that eclipselink can implement this as well?
	
	protected void updateVirtualPersistentAttributes() {
		Collection<OrmPersistentAttribute> contextAttributesToRemove = CollectionTools.collection(virtualAttributes());
		Collection<OrmPersistentAttribute> contextAttributesToUpdate = new ArrayList<OrmPersistentAttribute>();
		int resourceIndex = 0;
		
		ListIterator<JavaPersistentAttribute> javaAttributes = this.javaPersistentAttributes();
		for (JavaPersistentAttribute javaAttribute : CollectionTools.iterable(javaAttributes)) {
			if (specifiedAttributeNamed(javaAttribute.getName()) == null) {
				JavaAttributeMapping javaAttributeMapping = javaAttribute.getMapping();
				if (getMapping().isMetadataComplete()) {
					javaAttributeMapping = javaAttribute.getDefaultMapping();
				}
				boolean contextAttributeFound = false;
				for (OrmPersistentAttribute contextAttribute : contextAttributesToRemove) {
					//TODO not so sure about this, casting to VirtualXmlAttributeMapping as well as the getJavaAttributeMapping() api
					if (((VirtualXmlAttributeMapping<?>) contextAttribute.getMapping().getResourceAttributeMapping()).getJavaAttributeMapping() == javaAttributeMapping) {
						moveVirtualPersistentAttribute_(resourceIndex, contextAttribute);
						contextAttributesToRemove.remove(contextAttribute);
						contextAttributesToUpdate.add(contextAttribute);
						contextAttributeFound = true;
						break;
					}
				}
				if (!contextAttributeFound) {
					addVirtualPersistentAttribute(javaAttribute);
				}
				resourceIndex++;
			}
		}
		
		for (OrmPersistentAttribute contextAttribute : contextAttributesToRemove) {
			removeVirtualPersistentAttribute(contextAttribute);
		}
		//first handle adding/removing of the persistent attributes, then update the others last, 
		//this causes less churn in the update process
		for (OrmPersistentAttribute contextAttribute : contextAttributesToUpdate) {
			contextAttribute.update();
		}
	}

	protected void addVirtualPersistentAttribute(JavaPersistentAttribute javaAttribute) {
		addVirtualPersistentAttribute(buildVirtualOrmPersistentAttribute(javaAttribute));
	}
	
	protected OrmPersistentAttribute buildVirtualOrmPersistentAttribute(JavaPersistentAttribute javaAttribute) {
		String javaMappingKey = javaAttribute.getMappingKey();
		JavaAttributeMapping javaAttributeMapping = javaAttribute.getMapping();
		if (getMapping().isMetadataComplete()) {
			javaMappingKey = javaAttribute.getDefaultMappingKey();
			javaAttributeMapping = javaAttribute.getDefaultMapping();
		}
		OrmPersistentAttribute ormPersistentAttribute = buildOrmPersistentAttribute(javaMappingKey);
		XmlAttributeMapping resourceMapping = getJpaPlatform().buildVirtualOrmResourceMappingFromMappingKey(javaMappingKey, getMapping(), javaAttributeMapping);
		ormPersistentAttribute.initialize(resourceMapping);
		return ormPersistentAttribute;
	}
	
	public PersistentAttribute resolveAttribute(String attributeName) {
		Iterator<OrmPersistentAttribute> attributes = attributesNamed(attributeName);
		if (attributes.hasNext()) {
			OrmPersistentAttribute attribute = attributes.next();
			return attributes.hasNext() ? null /* more than one */: attribute;
		}
		else if (getParentPersistentType() != null) {
			return getParentPersistentType().resolveAttribute(attributeName);
		}
		else {
			return null;
		}
	}
	
	public JpaStructureNode getStructureNode(int textOffset) {
		for (OrmPersistentAttribute attribute : CollectionTools.iterable(specifiedAttributes())) {
			if (attribute.contains(textOffset)) {
				return attribute;
			}
		}
		return this;
	}
	
	public boolean contains(int textOffset) {
		return this.ormTypeMapping.containsOffset(textOffset);
	}
	
	public TextRange getSelectionTextRange() {
		return this.ormTypeMapping.getSelectionTextRange();
	}
	
	//******************** validation **********************
	
	@Override
	public void validate(List<IMessage> messages) {
		super.validate(messages);
		this.validateMapping(messages);
		this.validateAttributes(messages);
	}
	
	protected void validateMapping(List<IMessage> messages) {
		try {
			this.ormTypeMapping.validate(messages);
		} catch(Throwable t) {
			JptCorePlugin.log(t);
		}
	}
	
	protected void validateAttributes(List<IMessage> messages) {
		for (Iterator<OrmPersistentAttribute> stream = this.attributes(); stream.hasNext(); ) {
			this.validateAttribute(stream.next(), messages);
		}
	}
	
	protected void validateAttribute(OrmPersistentAttribute attribute, List<IMessage> messages) {
		try {
			attribute.validate(messages);
		} catch(Throwable t) {
			JptCorePlugin.log(t);
		}
	}
	
	public TextRange getValidationTextRange() {
		return this.ormTypeMapping.getValidationTextRange();
	}
	
	public void dispose() {
		if (getJavaPersistentType() != null) {
			getJavaPersistentType().dispose();
		}
	}

	@Override
	public void toString(StringBuilder sb) {
		sb.append(this.getName());
	}

}