bundles/org.eclipse.wst.xsl.core/src_validation/org/eclipse/wst/xsl/core/internal/compiler/xslt10/extensions/ExtensionHandlerJava.java

/*******************************************************************************
 * Copyright (c) 2007 Standards for Technology in Automotive Retail
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     David Carver - STAR - bug 224197 - initial API and implementation
 *                    based on work from Apache Xalan 2.7.0
 *******************************************************************************/

/*
 * Copyright 1999-2004 The Apache Software Foundation.
 *
 * Licensed 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: ExtensionHandlerJava.java,v 1.2 2008/03/28 02:38:17 dacarver Exp $
 */
package org.eclipse.wst.xsl.core.internal.compiler.xslt10.extensions;

import java.util.Hashtable;

/**
 * Abstract base class handling the java language extensions for XPath. This
 * base class provides cache management shared by all of the various java
 * extension handlers.
 * 
 * @xsl.usage internal
 */
public abstract class ExtensionHandlerJava extends ExtensionHandler {

	/** Extension class name */
	protected String m_className = "";

	/** Table of cached methods */
	private Hashtable m_cachedMethods = new Hashtable();

	/**
	 * Construct a new extension handler given all the information needed.
	 * 
	 * @param namespaceUri
	 *            the extension namespace URI that I'm implementing
	 * @param funcNames
	 *            string containing list of functions of extension NS
	 * @param lang
	 *            language of code implementing the extension
	 * @param srcURL
	 *            value of src attribute (if any) - treated as a URL or a
	 *            classname depending on the value of lang. If srcURL is not
	 *            null, then scriptSrc is ignored.
	 * @param scriptSrc
	 *            the actual script code (if any)
	 * @param scriptLang
	 *            the scripting language
	 * @param className
	 *            the extension class name
	 */
	protected ExtensionHandlerJava(String namespaceUri, String scriptLang,
			String className) {

		super(namespaceUri, scriptLang);

		m_className = className;
	}

	/**
	 * Look up the entry in the method cache.
	 * 
	 * @param methodKey
	 *            A key that uniquely identifies this invocation in the
	 *            stylesheet.
	 * @param objType
	 *            A Class object or instance object representing the type
	 * @param methodArgs
	 *            An array of the XObject arguments to be used for function
	 *            mangling.
	 * 
	 * @return The given method from the method cache
	 */
	public Object getFromCache(Object methodKey, Object objType,
			Object[] methodArgs) {

		// Eventually, we want to insert code to mangle the methodKey with
		// methodArgs
		return m_cachedMethods.get(methodKey);
	}

	/**
	 * Add a new entry into the method cache.
	 * 
	 * @param methodKey
	 *            A key that uniquely identifies this invocation in the
	 *            stylesheet.
	 * @param objType
	 *            A Class object or instance object representing the type
	 * @param methodArgs
	 *            An array of the XObject arguments to be used for function
	 *            mangling.
	 * @param methodObj
	 *            A Class object or instance object representing the method
	 * 
	 * @return The cached method object
	 */
	public Object putToCache(Object methodKey, Object objType,
			Object[] methodArgs, Object methodObj) {

		// Eventually, we want to insert code to mangle the methodKey with
		// methodArgs
		return m_cachedMethods.put(methodKey, methodObj);
	}
}