/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-04 Wolfgang M. Meier
* wolfgang@exist-db.org
* http://exist.sourceforge.net
*
* 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 program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id$
*/
package org.exist.xupdate;
import java.util.Map;
import org.exist.EXistException;
import org.exist.dom.*;
import org.exist.security.Permission;
import org.exist.security.PermissionDeniedException;
import org.exist.storage.DBBroker;
import org.exist.storage.NotificationService;
import org.exist.storage.UpdateListener;
import org.exist.storage.txn.Txn;
import org.exist.util.LockException;
import org.exist.xquery.XPathException;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* Implements the XUpdate update modification.
*
* @author wolf
*/
public class Update extends Modification {
/**
* @param broker
* @param docs
* @param namespaces
* @param variables
* @param selectStmt
*/
public Update(DBBroker broker, DocumentSet docs, String selectStmt,
Map namespaces, Map variables) {
super(broker, docs, selectStmt, namespaces, variables);
}
/*
* (non-Javadoc)
*
* @see org.exist.xupdate.Modification#process(org.exist.dom.DocumentSet)
*/
public long process(Txn transaction) throws PermissionDeniedException, LockException,
EXistException, XPathException {
NodeList children = content;
if (children.getLength() == 0)
return 0;
int modifications = children.getLength();
try {
StoredNode ql[] = selectAndLock(transaction);
IndexListener listener = new IndexListener(ql);
NotificationService notifier = broker.getBrokerPool().getNotificationService();
Node temp;
TextImpl text;
AttrImpl attribute;
ElementImpl parent;
for (int i = 0; i < ql.length; i++) {
StoredNode node = ql[i];
if (node == null) {
LOG.warn("select " + selectStmt + " returned empty node");
continue;
}
DocumentImpl doc = (DocumentImpl)node.getOwnerDocument();
doc.getMetadata().setIndexListener(listener);
if (!doc.getPermissions().validate(broker.getUser(),
Permission.UPDATE))
throw new PermissionDeniedException(
"permission to update document denied");
switch (node.getNodeType()) {
case Node.ELEMENT_NODE:
if (modifications == 0) modifications = 1;
((ElementImpl) node).update(transaction, children);
break;
case Node.TEXT_NODE:
parent = (ElementImpl) node.getParentNode();
temp = children.item(0);
text = new TextImpl(temp.getNodeValue());
modifications = 1;
text.setOwnerDocument(doc);
parent.updateChild(transaction, node, text);
break;
case Node.ATTRIBUTE_NODE:
parent = (ElementImpl) node.getParentNode();
if (parent == null) {
LOG.warn("parent node not found for "
+ node.getNodeId());
break;
}
AttrImpl attr = (AttrImpl) node;
temp = children.item(0);
attribute = new AttrImpl(attr.getQName(), temp.getNodeValue());
attribute.setOwnerDocument(doc);
parent.updateChild(transaction, node, attribute);
break;
default:
throw new EXistException("unsupported node-type");
}
doc.getMetadata().clearIndexListener();
doc.getMetadata().setLastModified(System.currentTimeMillis());
modifiedDocuments.add(doc);
broker.storeXMLResource(transaction, doc);
notifier.notifyUpdate(doc, UpdateListener.UPDATE);
}
checkFragmentation(transaction, modifiedDocuments);
} finally {
unlockDocuments(transaction);
}
return modifications;
}
/*
* (non-Javadoc)
*
* @see org.exist.xupdate.Modification#getName()
*/
public String getName() {
return XUpdateProcessor.UPDATE;
}
}