| /* |
| * 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.provider; |
| |
| import org.apache.commons.proxy.ObjectProvider; |
| import org.apache.commons.proxy.ProxyUtils; |
| import org.apache.commons.proxy.exception.ObjectProviderException; |
| |
| import java.io.Serializable; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| |
| /** |
| * Merely calls <code>clone()</code> (reflectively) on the given {@link Cloneable} object. |
| * |
| * @author James Carman |
| * @since 1.0 |
| */ |
| public class CloningProvider implements ObjectProvider, Serializable |
| { |
| //********************************************************************************************************************** |
| // Fields |
| //********************************************************************************************************************** |
| |
| private final Cloneable cloneable; |
| private Method cloneMethod; |
| |
| //********************************************************************************************************************** |
| // Constructors |
| //********************************************************************************************************************** |
| |
| /** |
| * Constructs a provider which returns clone copies of the specified {@link Cloneable} |
| * object. |
| * |
| * @param cloneable the object to clone |
| */ |
| public CloningProvider( Cloneable cloneable ) |
| { |
| this.cloneable = cloneable; |
| } |
| |
| //********************************************************************************************************************** |
| // ObjectProvider Implementation |
| //********************************************************************************************************************** |
| |
| |
| public Object getObject() |
| { |
| try |
| { |
| return getCloneMethod().invoke(cloneable, ProxyUtils.EMPTY_ARGUMENTS); |
| } |
| catch( IllegalAccessException e ) |
| { |
| throw new ObjectProviderException( |
| "Class " + cloneable.getClass().getName() + " does not have a public clone() method.", e); |
| } |
| catch( InvocationTargetException e ) |
| { |
| throw new ObjectProviderException( |
| "Attempt to clone object of type " + cloneable.getClass().getName() + " threw an exception.", e); |
| } |
| } |
| |
| //********************************************************************************************************************** |
| // Getter/Setter Methods |
| //********************************************************************************************************************** |
| |
| private synchronized Method getCloneMethod() |
| { |
| if( cloneMethod == null ) |
| { |
| try |
| { |
| cloneMethod = cloneable.getClass().getMethod("clone", ProxyUtils.EMPTY_ARGUMENT_TYPES); |
| } |
| catch( NoSuchMethodException e ) |
| { |
| throw new ObjectProviderException( |
| "Class " + cloneable.getClass().getName() + " does not have a public clone() method."); |
| } |
| } |
| return cloneMethod; |
| } |
| } |