/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-04 Wolfgang M. Meier (wolfgang@exist-db.org)
* and others (see 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 program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id$
*/
package org.exist.xupdate;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.exist.EXistException;
import org.exist.collections.triggers.TriggerException;
import org.exist.dom.DocumentSet;
import org.exist.security.PermissionDeniedException;
import org.exist.source.Source;
import org.exist.source.StringSource;
import org.exist.storage.DBBroker;
import org.exist.storage.XQueryPool;
import org.exist.storage.txn.Txn;
import org.exist.util.LockException;
import org.exist.xquery.CompiledXQuery;
import org.exist.xquery.XPathException;
import org.exist.xquery.XQuery;
import org.exist.xquery.XQueryContext;
import org.exist.xquery.value.Sequence;
/**
* @author wolf
*/
public class Conditional extends Modification {
private List<Modification> modifications = new ArrayList<Modification>(5);
/**
* @param broker
* @param docs
* @param selectStmt
* @param namespaces
*/
public Conditional(DBBroker broker, DocumentSet docs, String selectStmt,
Map<String, String> namespaces, Map<String, Object> variables) {
super(broker, docs, selectStmt, namespaces, variables);
}
public void addModification(Modification mod) {
modifications.add(mod);
}
/* (non-Javadoc)
* @see org.exist.xupdate.Modification#process()
*/
public long process(Txn transaction) throws PermissionDeniedException, LockException,
EXistException, XPathException, TriggerException {
LOG.debug("Processing xupdate:if ...");
final XQuery xquery = broker.getXQueryService();
final XQueryPool pool = xquery.getXQueryPool();
final Source source = new StringSource(selectStmt);
CompiledXQuery compiled = pool.borrowCompiledXQuery(broker, source);
XQueryContext context;
if(compiled == null)
{context = xquery.newContext(getAccessContext());}
else
{context = compiled.getContext();}
//context.setBackwardsCompatibility(true);
context.setStaticallyKnownDocuments(docs);
declareNamespaces(context);
declareVariables(context);
if(compiled == null)
try {
compiled = xquery.compile(context, source);
} catch (final IOException e) {
throw new EXistException("An exception occurred while compiling the query: " + e.getMessage());
}
Sequence seq = null;
try {
seq = xquery.execute(compiled, null);
} finally {
pool.returnCompiledXQuery(source, compiled);
}
if(seq.effectiveBooleanValue()) {
long mods = 0;
for (final Modification modification : modifications) {
mods += modification.process(transaction);
broker.flush();
}
if (LOG.isDebugEnabled())
{LOG.debug(mods + " modifications processed.");}
return mods;
} else
{return 0;}
}
/* (non-Javadoc)
* @see org.exist.xupdate.Modification#getName()
*/
public String getName() {
return "if";
}
}