/*
* 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.request;
import org.apache.log4j.Logger;
import org.exist.dom.QName;
import org.exist.http.servlets.RequestWrapper;
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 wolf
*/
public class SetAttribute extends Function {
protected static final Logger logger = Logger.getLogger(SetAttribute.class);
public final static FunctionSignature signature =
new FunctionSignature(
new QName( "set-attribute", RequestModule.NAMESPACE_URI, RequestModule.PREFIX ),
"Stores a value in the current request using the supplied attribute name.",
new SequenceType[] {
new FunctionParameterSequenceType( "name", Type.STRING, Cardinality.EXACTLY_ONE, "The attribute name" ),
new FunctionParameterSequenceType( "value", Type.ITEM, Cardinality.ZERO_OR_MORE, "The attribute value" )
},
new SequenceType( Type.ITEM, Cardinality.EMPTY )
);
public SetAttribute(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() );
}
}
RequestModule myModule = (RequestModule)context.getModule( RequestModule.NAMESPACE_URI );
// request object is read from global variable $request
Variable var = myModule.resolveVariable( RequestModule.REQUEST_VAR );
if( var == null || var.getValue() == null ) {
throw( new XPathException( this, "Request not set" ) );
}
if( var.getValue().getItemType() != Type.JAVA_OBJECT ) {
throw( new XPathException( this, "Variable $request is not bound to a Java object." ) );
}
JavaObjectValue request = (JavaObjectValue)var.getValue().itemAt( 0 );
// get attribute name parameter
String attribName = getArgument( 0 ).eval( contextSequence, contextItem ).getStringValue();
Sequence attribValue = getArgument( 1 ).eval( contextSequence, contextItem );
if( request.getObject() instanceof RequestWrapper ) {
((RequestWrapper)request.getObject()).setAttribute( attribName, attribValue );
} else {
throw( new XPathException( this, "Type error: variable $request is not bound to a request object" ) );
}
return( Sequence.EMPTY_SEQUENCE );
}
}