/* This file is part of the db4o object database http://www.db4o.com
Copyright (C) 2004 - 2011 Versant Corporation http://www.versant.com
db4o is free software; you can redistribute it and/or modify it under
the terms of version 3 of the GNU General Public License as published
by the Free Software Foundation.
db4o is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with this program. If not, see http://www.gnu.org/licenses/. */
package com.db4o.typehandlers;
import java.util.*;
import com.db4o.ext.*;
import com.db4o.foundation.*;
import com.db4o.internal.*;
import com.db4o.internal.delete.*;
import com.db4o.internal.handlers.*;
import com.db4o.internal.marshall.*;
import com.db4o.marshall.*;
/**
* TypeHandler for java.util.Vector for JDKs without the
* collection framework.
* @sharpen.ignore
*/
public class VectorTypeHandler implements ReferenceTypeHandler, CascadingTypeHandler, VariableLengthTypeHandler {
public PreparedComparison prepareComparison(Context context, Object obj) {
// TODO Auto-generated method stub
return null;
}
public void write(WriteContext context, Object obj) {
Vector vector = (Vector)obj;
TypeHandler4 elementHandler = detectElementTypeHandler(container(context), vector);
writeElementClassMetadataId(context, elementHandler);
writeElementCount(context, vector);
writeElements(context, vector, elementHandler);
}
public void activate(ReferenceActivationContext context) {
Vector vector = (Vector)((UnmarshallingContext) context).persistentObject();
vector.removeAllElements();
TypeHandler4 elementHandler = readElementTypeHandler(context, context);
int elementCount = context.readInt();
for (int i = 0; i < elementCount; i++) {
vector.addElement(context.readObject(elementHandler));
}
}
private void writeElementCount(WriteContext context, Vector vector) {
context.writeInt(vector.size());
}
private void writeElements(WriteContext context, Vector vector, TypeHandler4 elementHandler) {
final Enumeration elements = vector.elements();
while (elements.hasMoreElements()) {
context.writeObject(elementHandler, elements.nextElement());
}
}
private ObjectContainerBase container(Context context) {
return ((InternalObjectContainer)context.objectContainer()).container();
}
public void delete(final DeleteContext context) throws Db4oIOException {
if (! context.cascadeDelete()) {
return;
}
TypeHandler4 elementHandler = readElementTypeHandler(context, context);
int elementCount = context.readInt();
for (int i = elementCount; i > 0; i--) {
elementHandler.delete(context);
}
}
public void defragment(DefragmentContext context) {
TypeHandler4 elementHandler = readElementTypeHandler(context, context);
int elementCount = context.readInt();
for (int i = 0; i < elementCount; i++) {
elementHandler.defragment(context);
}
}
public final void cascadeActivation(ActivationContext context) {
Enumeration all = ((Vector) context.targetObject()).elements();
while (all.hasMoreElements()) {
context.cascadeActivationToChild(all.nextElement());
}
}
public TypeHandler4 readCandidateHandler(QueryingReadContext context) {
return this;
}
public void collectIDs(final QueryingReadContext context) {
TypeHandler4 elementHandler = readElementTypeHandler(context, context);
int elementCount = context.readInt();
for (int i = 0; i < elementCount; i++) {
context.readId(elementHandler);
}
}
private void writeElementClassMetadataId(WriteContext context, TypeHandler4 elementHandler) {
context.writeInt(0);
}
private TypeHandler4 readElementTypeHandler(ReadBuffer buffer, Context context) {
buffer.readInt();
return (TypeHandler4) container(context).handlers().openTypeHandler();
}
private TypeHandler4 detectElementTypeHandler(InternalObjectContainer container, Vector vector) {
return (TypeHandler4) container.handlers().openTypeHandler();
}
}