/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-09 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.xquery.functions.session;
//import org.apache.log4j.Logger;
import org.exist.dom.QName;
import org.exist.http.servlets.SessionWrapper;
import org.exist.xquery.Cardinality;
import org.exist.xquery.Dependency;
import org.exist.xquery.Function;
import org.exist.xquery.FunctionSignature;
import org.exist.xquery.Profiler;
import org.exist.xquery.Variable;
import org.exist.xquery.XPathException;
import org.exist.xquery.XQueryContext;
import org.exist.xquery.value.FunctionParameterSequenceType;
import org.exist.xquery.value.Item;
import org.exist.xquery.value.JavaObjectValue;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.SequenceType;
import org.exist.xquery.value.Type;
/**
* @author Adam Retter (adam.retter@devon.gov.uk)
* @author Loren Cahlander
*/
public class RemoveAttribute extends Function {
// private static final Logger logger = Logger.getLogger(RemoveAttribute.class);
public final static FunctionSignature signature =
new FunctionSignature(
new QName("remove-attribute", SessionModule.NAMESPACE_URI, SessionModule.PREFIX),
"Removes the attribute with the supplied name from the current session",
new SequenceType[] {
new FunctionParameterSequenceType("name", Type.STRING, Cardinality.EXACTLY_ONE, "The attribute name")
},
new SequenceType(Type.ITEM, Cardinality.EMPTY));
public RemoveAttribute(XQueryContext context) {
super(context, signature);
}
/* (non-Javadoc)
* @see org.exist.xquery.Expression#eval(org.exist.dom.DocumentSet, org.exist.xquery.value.Sequence, org.exist.xquery.value.Item)
*/
public Sequence eval(Sequence contextSequence, Item contextItem) throws XPathException {
if (context.getProfiler().isEnabled()) {
context.getProfiler().start(this);
context.getProfiler().message(this, Profiler.DEPENDENCIES, "DEPENDENCIES", Dependency.getDependenciesName(this.getDependencies()));
if (contextSequence != null)
{context.getProfiler().message(this, Profiler.START_SEQUENCES, "CONTEXT SEQUENCE", contextSequence);}
if (contextItem != null)
{context.getProfiler().message(this, Profiler.START_SEQUENCES, "CONTEXT ITEM", contextItem.toSequence());}
}
final SessionModule myModule = (SessionModule)context.getModule(SessionModule.NAMESPACE_URI);
// session object is read from global variable $session
final Variable var = myModule.resolveVariable(SessionModule.SESSION_VAR);
if(var == null || var.getValue() == null)
{throw new XPathException(this, "Session not set");}
if(var.getValue().getItemType() != Type.JAVA_OBJECT)
{throw new XPathException(this, "Variable $session is not bound to a Java object.");}
final JavaObjectValue session = (JavaObjectValue) var.getValue().itemAt(0);
// get attribute name parameter
final String attrib = getArgument(0).eval(contextSequence, contextItem).getStringValue();
if(session.getObject() instanceof SessionWrapper)
{((SessionWrapper)session.getObject()).removeAttribute(attrib);}
else
{throw new XPathException(this, "Type error: variable $session is not bound to a session object");}
return Sequence.EMPTY_SEQUENCE;
}
}