/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: FuncExtElementAvailable.java 468655 2006-10-28 07:12:06Z minchau $
*/
package org.apache.xpath.functions;
import org.apache.xalan.templates.Constants;
import org.apache.xalan.transformer.TransformerImpl;
import org.apache.xml.utils.QName;
import org.apache.xpath.ExtensionsProvider;
import org.apache.xpath.XPathContext;
import org.apache.xpath.objects.XBoolean;
import org.apache.xpath.objects.XObject;
/**
* Execute the ExtElementAvailable() function.
* @xsl.usage advanced
*/
public class FuncExtElementAvailable extends FunctionOneArg
{
static final long serialVersionUID = -472533699257968546L;
/**
* Execute the function. The function must return
* a valid object.
* @param xctxt The current execution context.
* @return A valid XObject.
*
* @throws javax.xml.transform.TransformerException
*/
public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
{
String prefix;
String namespace;
String methName;
String fullName = m_arg0.execute(xctxt).str();
int indexOfNSSep = fullName.indexOf(':');
if (indexOfNSSep < 0)
{
prefix = "";
namespace = Constants.S_XSLNAMESPACEURL;
methName = fullName;
}
else
{
prefix = fullName.substring(0, indexOfNSSep);
namespace = xctxt.getNamespaceContext().getNamespaceForPrefix(prefix);
if (null == namespace)
return XBoolean.S_FALSE;
methName= fullName.substring(indexOfNSSep + 1);
}
if (namespace.equals(Constants.S_XSLNAMESPACEURL)
|| namespace.equals(Constants.S_BUILTIN_EXTENSIONS_URL))
{
try
{
TransformerImpl transformer = (TransformerImpl) xctxt.getOwnerObject();
return transformer.getStylesheet().getAvailableElements().containsKey(
new QName(namespace, methName))
? XBoolean.S_TRUE : XBoolean.S_FALSE;
}
catch (Exception e)
{
return XBoolean.S_FALSE;
}
}
else
{
//dml
ExtensionsProvider extProvider = (ExtensionsProvider)xctxt.getOwnerObject();
return extProvider.elementAvailable(namespace, methName)
? XBoolean.S_TRUE : XBoolean.S_FALSE;
}
}
}