//$Id: PersistentElementHolder.java 10086 2006-07-05 18:17:27Z [email protected] $
package org.hibernate.collection;
import java.io.Serializable;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.dom4j.Element;
import org.hibernate.AssertionFailure;
import org.hibernate.HibernateException;
import org.hibernate.loader.CollectionAliases;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.persister.collection.CollectionPersister;
import org.hibernate.type.Type;
import org.hibernate.util.CollectionHelper;
/**
* A persistent wrapper for an XML element
*
* @author Gavin King
*/
public class PersistentElementHolder extends AbstractPersistentCollection {
protected Element element;
public PersistentElementHolder(SessionImplementor session, Element element) {
super(session);
this.element = element;
setInitialized();
}
public Serializable getSnapshot(CollectionPersister persister)
throws HibernateException {
final Type elementType = persister.getElementType();
List elements = element.elements( persister.getElementNodeName() );
ArrayList snapshot = new ArrayList( elements.size() );
for ( int i=0; i<elements.size(); i++ ) {
Element elem = (Element) elements.get(i);
Object value = elementType.fromXMLNode( elem, persister.getFactory() );
Object copy = elementType.deepCopy(value , getSession().getEntityMode(), persister.getFactory() );
snapshot.add(copy);
}
return snapshot;
}
public Collection getOrphans(Serializable snapshot, String entityName)
throws HibernateException {
//orphan delete not supported for EntityMode.DOM4J
return CollectionHelper.EMPTY_COLLECTION;
}
public PersistentElementHolder(SessionImplementor session, CollectionPersister persister, Serializable key)
throws HibernateException {
super(session);
Element owner = (Element) session.getPersistenceContext().getCollectionOwner(key, persister);
if (owner==null) throw new AssertionFailure("null owner");
//element = XMLHelper.generateDom4jElement( persister.getNodeName() );
final String nodeName = persister.getNodeName();
if ( ".".equals(nodeName) ) {
element = owner;
}
else {
element = owner.element( nodeName );
if (element==null) element = owner.addElement( nodeName );
}
}
public boolean isWrapper(Object collection) {
return element==collection;
}
public boolean equalsSnapshot(CollectionPersister persister) throws HibernateException {
Type elementType = persister.getElementType();
ArrayList snapshot = (ArrayList) getSnapshot();
List elements = element.elements( persister.getElementNodeName() );
if ( snapshot.size()!= elements.size() ) return false;
for ( int i=0; i<snapshot.size(); i++ ) {
Object old = snapshot.get(i);
Element elem = (Element) elements.get(i);
Object current = elementType.fromXMLNode( elem, persister.getFactory() );
if ( elementType.isDirty( old, current, getSession() ) ) return false;
}
return true;
}
public boolean isSnapshotEmpty(Serializable snapshot) {
return ( (Collection) snapshot ).isEmpty();
}
public boolean empty() {
return !element.elementIterator().hasNext();
}
public Object readFrom(ResultSet rs, CollectionPersister persister, CollectionAliases descriptor, Object owner)
throws HibernateException, SQLException {
Object object = persister.readElement( rs, owner, descriptor.getSuffixedElementAliases(), getSession() );
final Type elementType = persister.getElementType();
Element subelement = element.addElement( persister.getElementNodeName() );
elementType.setToXMLNode( subelement, object, persister.getFactory() );
return object;
}
public Iterator entries(CollectionPersister persister) {
final Type elementType = persister.getElementType();
List elements = element.elements( persister.getElementNodeName() );
int length = elements.size();
List result = new ArrayList(length);
for ( int i=0; i<length; i++ ) {
Element elem = (Element) elements.get(i);
Object object = elementType.fromXMLNode( elem, persister.getFactory() );
result.add(object);
}
return result.iterator();
}
public void beforeInitialize(CollectionPersister persister, int anticipatedSize) {}
public boolean isDirectlyAccessible() {
return true;
}
public void initializeFromCache(CollectionPersister persister, Serializable disassembled, Object owner)
throws HibernateException {
Type elementType = persister.getElementType();
Serializable[] cached = (Serializable[]) disassembled;
for ( int i=0; i<cached.length; i++ ) {
Object object = elementType.assemble( cached[i], getSession(), owner );
Element subelement = element.addElement( persister.getElementNodeName() );
elementType.setToXMLNode( subelement, object, persister.getFactory() );
}
}
public Serializable disassemble(CollectionPersister persister) throws HibernateException {
Type elementType = persister.getElementType();
List elements = element.elements( persister.getElementNodeName() );
int length = elements.size();
Serializable[] result = new Serializable[length];
for ( int i=0; i<length; i++ ) {
Element elem = (Element) elements.get(i);
Object object = elementType.fromXMLNode( elem, persister.getFactory() );
result[i] = elementType.disassemble( object, getSession(), null );
}
return result;
}
public Object getValue() {
return element;
}
public Iterator getDeletes(CollectionPersister persister, boolean indexIsFormula)
throws HibernateException {
Type elementType = persister.getElementType();
ArrayList snapshot = (ArrayList) getSnapshot();
List elements = element.elements( persister.getElementNodeName() );
ArrayList result = new ArrayList();
for ( int i=0; i<snapshot.size(); i++ ) {
Object old = snapshot.get(i);
if ( i >= elements.size() ) {
result.add(old);
}
else {
Element elem = (Element) elements.get(i);
Object object = elementType.fromXMLNode( elem, persister.getFactory() );
if ( elementType.isDirty( old, object, getSession() ) ) result.add(old);
}
}
return result.iterator();
}
public boolean needsInserting(Object entry, int i, Type elementType)
throws HibernateException {
ArrayList snapshot = (ArrayList) getSnapshot();
return i>=snapshot.size() || elementType.isDirty( snapshot.get(i), entry, getSession() );
}
public boolean needsUpdating(Object entry, int i, Type elementType)
throws HibernateException {
return false;
}
public Object getIndex(Object entry, int i, CollectionPersister persister) {
throw new UnsupportedOperationException();
}
public Object getElement(Object entry) {
return entry;
}
public Object getSnapshotElement(Object entry, int i) {
throw new UnsupportedOperationException();
}
public boolean entryExists(Object entry, int i) {
return entry!=null;
}
}
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