| /* |
| * 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. |
| */ |
| package org.apache.commons.functor.adapter; |
| |
| import java.io.Serializable; |
| |
| import org.apache.commons.functor.Function; |
| import org.apache.commons.functor.Procedure; |
| |
| /** |
| * Adapts a {@link Function Function} |
| * to the {@link Procedure Procedure} |
| * interface by ignoring the value returned |
| * by the function. |
| * <p/> |
| * Note that although this class implements |
| * {@link Serializable}, a given instance will |
| * only be truly <code>Serializable</code> if the |
| * underlying function is. Attempts to serialize |
| * an instance whose delegate is not |
| * <code>Serializable</code> will result in an exception. |
| * |
| * @version $Revision$ $Date$ |
| * @author Rodney Waldhoff |
| */ |
| public final class FunctionProcedure implements Procedure, Serializable { |
| /** |
| * Create an {@link Procedure Procedure} wrapping |
| * the given {@link Function Function}. |
| * @param function the {@link Function Function} to wrap |
| */ |
| public FunctionProcedure(Function function) { |
| this.function = function; |
| } |
| |
| /** |
| * {@link Function#evaluate Evaluate} my function, |
| * but ignore its returned value. |
| */ |
| public void run() { |
| function.evaluate(); |
| } |
| |
| public boolean equals(Object that) { |
| if(that instanceof FunctionProcedure) { |
| return equals((FunctionProcedure)that); |
| } else { |
| return false; |
| } |
| } |
| |
| public boolean equals(FunctionProcedure that) { |
| return that == this || (null != that && (null == function ? null == that.function : function.equals(that.function))); |
| } |
| |
| public int hashCode() { |
| int hash = "FunctionProcedure".hashCode(); |
| if(null != function) { |
| hash ^= function.hashCode(); |
| } |
| return hash; |
| } |
| |
| public String toString() { |
| return "FunctionProcedure<" + function + ">"; |
| } |
| /** |
| * Adapt the given, possibly-<code>null</code>, |
| * {@link Function Function} to the |
| * {@link Procedure Procedure} interface. |
| * When the given <code>Function</code> is <code>null</code>, |
| * returns <code>null</code>. |
| * |
| * @param function the possibly-<code>null</code> |
| * {@link Function Function} to adapt |
| * @return a {@link Procedure Procedure} wrapping the given |
| * {@link Function Function}, or <code>null</code> |
| * if the given <code>Function</code> is <code>null</code> |
| */ |
| public static FunctionProcedure adapt(Function function) { |
| return null == function ? null : new FunctionProcedure(function); |
| } |
| |
| /** The {@link Function Function} I'm wrapping. */ |
| private Function function = null; |
| } |