ClassCache.java |
/* * The Apache Software License, Version 1.1 * * Copyright (c) 2001-2002 The Apache Software Foundation. All rights * reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The end-user documentation included with the redistribution, * if any, must include the following acknowledgment: * "This product includes software developed by the * Apache Software Foundation (http://www.apache.org/)." * Alternately, this acknowledgment may appear in the software itself, * if and wherever such third-party acknowledgments normally appear. * * 4. The names "Axis" and "Apache Software Foundation" must * not be used to endorse or promote products derived from this * software without prior written permission. For written * permission, please contact apache@apache.org. * * 5. Products derived from this software may not be called "Apache", * nor may "Apache" appear in their name, without prior written * permission of the Apache Software Foundation. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of the Apache Software Foundation. For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. */ package org.jboss.axis.utils.cache; import org.jboss.axis.utils.ClassUtils; import java.util.Hashtable; /** * A cache class for JavaClass objects, which enables us to quickly reference * methods. * * @author Doug Davis (dug@us.ibm.com) * @author Glen Daniels (gdaniels@apache.org) */ public class ClassCache { Hashtable classCache = new Hashtable(); public ClassCache() { } /** * Register a class in the cache. Creates a new JavaClass object * around the given class, and inserts it into the Hashtable, replacing * any previous entry. * * @param name the name of the class. * @param cls a Java Class. */ public synchronized void registerClass(String name, Class cls) { if (name == null) return; // ??? Should we let this NPE? JavaClass oldClass = (JavaClass)classCache.get(name); if (oldClass != null && oldClass.getJavaClass() == cls) return; classCache.put(name, new JavaClass(cls)); } /** * Remove an entry from the cache. * * @param name the name of the class to remove. */ public synchronized void deregisterClass(String name) { classCache.remove(name); } /** * Query a given class' cache status. * * @param name a class name * @return true if the class is in the cache, false otherwise */ public boolean isClassRegistered(String name) { return (classCache != null && classCache.get(name) != null); } /** * Find the cached JavaClass entry for this class, creating one * if necessary. * * @param className name of the class desired * @param cl ClassLoader to use if we need to load the class * @return JavaClass entry */ public JavaClass lookup(String className, ClassLoader cl) throws ClassNotFoundException { if (className == null) { return null; } JavaClass jc = (JavaClass)classCache.get(className); if ((jc == null) && (cl != null)) { // Try to load the class with the specified classloader Class cls = ClassUtils.forName(className, true, cl); jc = new JavaClass(cls); } return jc; } } ;
ClassCache.java |