Java tutorial
/** * Copyright (C) 2004 Orbeon, Inc. * * 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 * 2.1 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. * * The full text of the license is available at http://www.gnu.org/copyleft/lesser.html */ package org.orbeon.oxf.transformer.xupdate; import org.dom4j.Namespace; import org.dom4j.QName; import org.jaxen.UnresolvableException; import org.jaxen.VariableContext; import org.orbeon.oxf.transformer.xupdate.statement.Utils; public class VariableContextImpl implements VariableContext { private VariableContextImpl parentContext; private QName qname; private Object value; public VariableContextImpl() { } public VariableContextImpl(VariableContextImpl parentContext, QName qname, Object value) { this.parentContext = parentContext; this.qname = qname; this.value = value; } public Object getVariableValue(String namespaceURI, String prefix, String localName) throws UnresolvableException { if (this.qname == null) { throw new UnresolvableException( "Variable '" + Utils.qualifiedName(prefix, localName) + "' is not defined"); } else { QName qname = new QName(localName, new Namespace(prefix, namespaceURI)); return this.qname.equals(qname) ? value : parentContext.getVariableValue(namespaceURI, prefix, localName); } } public void assign(QName qname, Object value) throws UnresolvableException { if (this.qname == null) { throw new UnresolvableException("Variable '" + qname.getQualifiedName() + "' is not defined"); } else { if (this.qname.equals(qname)) this.value = value; else parentContext.assign(qname, value); } } }