| /* |
| * 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. |
| */ |
| |
| package org.apache.commons.proxy; |
| |
| import org.apache.commons.proxy.invoker.NullInvoker; |
| |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.HashMap; |
| |
| /** |
| * Provides some helpful proxy utility methods. |
| * |
| * @author James Carman |
| * @since 1.0 |
| */ |
| public class ProxyUtils |
| { |
| //---------------------------------------------------------------------------------------------------------------------- |
| // Fields |
| //---------------------------------------------------------------------------------------------------------------------- |
| |
| public static final Object[] EMPTY_ARGUMENTS = new Object[0]; |
| public static final Class[] EMPTY_ARGUMENT_TYPES = new Class[0]; |
| private static final Map wrapperClassMap = new HashMap(); |
| |
| //---------------------------------------------------------------------------------------------------------------------- |
| // Static Methods |
| //---------------------------------------------------------------------------------------------------------------------- |
| |
| static |
| { |
| wrapperClassMap.put( Integer.TYPE, Integer.class ); |
| wrapperClassMap.put( Character.TYPE, Character.class ); |
| wrapperClassMap.put( Boolean.TYPE, Boolean.class ); |
| wrapperClassMap.put( Short.TYPE, Short.class ); |
| wrapperClassMap.put( Long.TYPE, Long.class ); |
| wrapperClassMap.put( Float.TYPE, Float.class ); |
| wrapperClassMap.put( Double.TYPE, Double.class ); |
| wrapperClassMap.put( Byte.TYPE, Byte.class ); |
| } |
| /** |
| * Creates a "null object" which implements the <code>proxyClasses</code>. |
| * |
| * @param proxyFactory the proxy factory to be used to create the proxy object |
| * @param proxyClasses the proxy interfaces |
| * @return a "null object" which implements the <code>proxyClasses</code>. |
| */ |
| public static Object createNullObject( ProxyFactory proxyFactory, Class[] proxyClasses ) |
| { |
| return proxyFactory.createInvokerProxy( new NullInvoker(), proxyClasses ); |
| } |
| |
| /** |
| * Creates a "null object" which implements the <code>proxyClasses</code>. |
| * |
| * @param proxyFactory the proxy factory to be used to create the proxy object |
| * @param classLoader the class loader to be used by the proxy factory to create the proxy object |
| * @param proxyClasses the proxy interfaces |
| * @return a "null object" which implements the <code>proxyClasses</code>. |
| */ |
| public static Object createNullObject( ProxyFactory proxyFactory, ClassLoader classLoader, Class[] proxyClasses ) |
| { |
| return proxyFactory.createInvokerProxy( classLoader, new NullInvoker(), proxyClasses ); |
| } |
| |
| /** |
| * <p>Gets an array of {@link Class} objects representing all interfaces implemented by the given class and its |
| * superclasses.</p> |
| * <p/> |
| * <p>The order is determined by looking through each interface in turn as declared in the source file and following |
| * its hierarchy up. Then each superclass is considered in the same way. Later duplicates are ignored, so the order |
| * is maintained.</p> |
| * <p/> |
| * <b>Note</b>: Implementation of this method was "borrowed" from |
| * <a href="http://commons.apache.org/lang/">Apache Commons Lang</a> to avoid a dependency.</p> |
| * |
| * @param cls the class to look up, may be <code>null</code> |
| * @return an array of {@link Class} objects representing all interfaces implemented by the given class and its |
| * superclasses or <code>null</code> if input class is null. |
| */ |
| public static Class[] getAllInterfaces( Class cls ) |
| { |
| final List interfaces = getAllInterfacesImpl( cls, new LinkedList() ); |
| return interfaces == null ? null : ( Class[] ) interfaces.toArray( new Class[interfaces.size()] ); |
| } |
| |
| private static List getAllInterfacesImpl( Class cls, List list ) |
| { |
| if( cls == null ) |
| { |
| return null; |
| } |
| while( cls != null ) |
| { |
| Class[] interfaces = cls.getInterfaces(); |
| for( int i = 0; i < interfaces.length; i++ ) |
| { |
| if( !list.contains( interfaces[i] ) ) |
| { |
| list.add( interfaces[i] ); |
| } |
| getAllInterfacesImpl( interfaces[i], list ); |
| } |
| cls = cls.getSuperclass(); |
| } |
| return list; |
| } |
| |
| /** |
| * Returns the class name as you would expect to see it in Java code. |
| * <p/> |
| * <b>Examples:</b> <ul> <li>getJavaClassName( Object[].class ) == "Object[]"</li> <li>getJavaClassName( |
| * Object[][].class ) == "Object[][]"</li> <li>getJavaClassName( Integer.TYPE ) == "int"</li> </p> |
| * |
| * @param clazz the class |
| * @return the class' name as you would expect to see it in Java code |
| */ |
| public static String getJavaClassName( Class clazz ) |
| { |
| if( clazz.isArray() ) |
| { |
| return getJavaClassName( clazz.getComponentType() ) + "[]"; |
| } |
| return clazz.getName(); |
| } |
| |
| /** |
| * Returns the wrapper class for the given primitive type. |
| * @param primitiveType the primitive type |
| * @return the wrapper class |
| */ |
| public static Class getWrapperClass( Class primitiveType ) |
| { |
| return ( Class )wrapperClassMap.get( primitiveType ); |
| } |
| } |
| |