/*
* 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.collections.triggers.TriggerException;
import org.exist.dom.DocumentImpl;
import org.exist.dom.DocumentSet;
import org.exist.dom.StoredNode;
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.NodeList;
/**
* Implements an XUpate append statement.
*
* Note: appending an attribute that is already present in
* an element will overwrite the old attribute value.
*
* @author Wolfgang Meier
*/
public class Append extends Modification {
private int child;
/**
* Constructor for Append.
* @param selectStmt
*/
public Append(DBBroker broker, DocumentSet docs, String selectStmt,
String childAttr, Map<String, String> namespaces, Map<String, Object> variables) {
super(broker, docs, selectStmt, namespaces, variables);
if(childAttr == null || "last()".equals(childAttr))
{child = -1;}
else
{child = Integer.parseInt(childAttr);}
}
/*
* @see org.exist.xupdate.Modification#process()
*/
public long process(Txn transaction) throws PermissionDeniedException, LockException,
EXistException, XPathException, TriggerException {
final NodeList children = content;
if(children.getLength() == 0)
{return 0;}
try {
final StoredNode ql[] = selectAndLock(transaction);
final IndexListener listener = new IndexListener(ql);
final NotificationService notifier = broker.getBrokerPool().getNotificationService();
for(int i = 0; i < ql.length; i++) {
final StoredNode node = ql[i];
final DocumentImpl doc = (DocumentImpl)node.getOwnerDocument();
doc.getMetadata().setIndexListener(listener);
if (!doc.getPermissions().validate(broker.getSubject(), Permission.WRITE)) {
throw new PermissionDeniedException("User '" + broker.getSubject().getName() + "' does not have permission to write to the document '" + doc.getDocumentURI() + "'!");
}
node.appendChildren(transaction, children, child);
doc.getMetadata().clearIndexListener();
doc.getMetadata().setLastModified(System.currentTimeMillis());
modifiedDocuments.add(doc);
broker.storeXMLResource(transaction, doc);
notifier.notifyUpdate(doc, UpdateListener.UPDATE);
}
checkFragmentation(transaction, modifiedDocuments);
return ql.length;
} finally {
// release all acquired locks
unlockDocuments(transaction);
}
}
public String getName() {
return "append";
}
}