- /*
- * Copyright 2003-2004 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: Utils.java,v 1.3 2004/02/17 04:18:18 minchau Exp $
- */
- package com.sun.org.apache.xml.internal.serializer;
-
- import java.util.Hashtable;
-
- /**
- * This class contains utilities used by the serializer
- */
- class Utils
- {
-
- /**
- * This nested class acts as a way to lazy load the hashtable
- * in a thread safe way.
- */
- static private class CacheHolder
- {
- static final Hashtable cache;
- static {
- cache = new Hashtable();
- }
- }
- /**
- * Load the class by name.
- *
- * This implementation, for performance reasons,
- * caches all classes loaded by name and
- * returns the cached Class object if it can previously
- * loaded classes that were load by name. If not previously loaded
- * an attempt is made to load with Class.forName(classname)
- * @param classname the name of the class to be loaded
- * @return the loaded class, never null. If the class could not be
- * loaded a ClassNotFound exception is thrown.
- * @throws ClassNotFoundException if the class was not loaded
- */
- static Class ClassForName(String classname) throws ClassNotFoundException
- {
- Class c;
- // the first time the next line runs will reference
- // CacheHolder, causing the class to load and create the
- // Hashtable.
- Object o = CacheHolder.cache.get(classname);
- if (o == null)
- {
- // class was not in the cache, so try to load it
- c = Class.forName(classname);
- // if the class is not found we will have thrown a
- // ClassNotFoundException on the statement above
-
- // if we get here c is not null
- CacheHolder.cache.put(classname, c);
- }
- else
- {
- c = (Class)o;
- }
- return c;
- }
- }