/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-09 The eXist Project
* http://exist-db.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* $Id$
*
* Original package com.ocom.leaseman.modules.lease (Scott Warren)
*/
package org.exist.xquery.functions.util;
import java.util.Properties;
import org.apache.log4j.Logger;
import org.exist.dom.QName;
import org.exist.memtree.DocumentBuilderReceiver;
import org.exist.memtree.MemTreeBuilder;
import org.exist.xquery.BasicFunction;
import org.exist.xquery.Cardinality;
import org.exist.xquery.FunctionSignature;
import org.exist.xquery.XPathException;
import org.exist.xquery.XQueryContext;
import org.exist.xquery.value.FunctionParameterSequenceType;
import org.exist.xquery.value.FunctionReturnSequenceType;
import org.exist.xquery.value.Item;
import org.exist.xquery.value.NodeValue;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.SequenceType;
import org.exist.xquery.value.Type;
import org.xml.sax.SAXException;
public class DeepCopyFunction extends BasicFunction {
protected static final Logger logger = Logger.getLogger(DeepCopyFunction.class);
public final static FunctionSignature signature =
new FunctionSignature(
new QName("deep-copy", UtilModule.NAMESPACE_URI, UtilModule.PREFIX),
"Performs a Deep Clone of the passed in item.",
new SequenceType[]
{
new FunctionParameterSequenceType("item", Type.ITEM, Cardinality.ZERO_OR_ONE, "The item to be cloned"),
},
new FunctionReturnSequenceType(Type.ITEM, Cardinality.ZERO_OR_ONE, "the item clone"));
public DeepCopyFunction(XQueryContext context, FunctionSignature signature) {
super(context, signature);
}
public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException {
if (args[0].isEmpty()) {
return Sequence.EMPTY_SEQUENCE;
}
final Item a = args[0].itemAt(0);
final MemTreeBuilder builder = new MemTreeBuilder(context);
builder.startDocument();
final DocumentBuilderReceiver receiver = new DocumentBuilderReceiver(builder);
try {
final Properties props = new Properties();
a.toSAX(context.getBroker(), receiver, props);
} catch (final SAXException e) {
throw new XPathException(this, "Cannot Deep-copy Item");
}
builder.endDocument();
return (NodeValue)receiver.getDocument().getDocumentElement();
}
}