| /* |
| * Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Sun designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Sun in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| |
| package com.sun.xml.internal.ws.api.pipe; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * Clones the whole pipeline. |
| * |
| * <p> |
| * Since {@link Tube}s may form an arbitrary directed graph, someone needs |
| * to keep track of isomorphism for a clone to happen correctly. This class |
| * serves that role. |
| * |
| * @author Kohsuke Kawaguchi |
| */ |
| public class TubeCloner { |
| // Pipe to pipe, or tube to tube |
| protected final Map<Object,Object> master2copy = new HashMap<Object,Object>(); |
| |
| /*package*/ TubeCloner() { |
| } |
| |
| /** |
| * Invoked by a client of a tube to clone the whole pipeline. |
| * |
| * <p> |
| * {@link Tube}s implementing the {@link Tube#copy(TubeCloner)} method |
| * shall use {@link #copy(Tube)} method. |
| * |
| * @param p |
| * The entry point of a pipeline to be copied. must not be null. |
| * @return |
| * The cloned pipeline. Always non-null. |
| */ |
| public static Tube clone(Tube p) { |
| // we often want to downcast TubeCloner to PipeCloner, |
| // so let's create PipeCloner to make that possible |
| return new PipeCloner().copy(p); |
| } |
| |
| /** |
| * Invoked by a {@link Tube#copy(TubeCloner)} implementation |
| * to copy a reference to another pipe. |
| * |
| * <p> |
| * This method is for {@link Tube} implementations, not for users. |
| * |
| * <p> |
| * If the given tube is already copied for this cloning episode, |
| * this method simply returns that reference. Otherwise it copies |
| * a tube, make a note, and returns a copied tube. This additional |
| * step ensures that a graph is cloned isomorphically correctly. |
| * |
| * <p> |
| * (Think about what happens when a graph is A->B, A->C, B->D, and C->D |
| * if you don't have this step.) |
| * |
| * @param t |
| * The tube to be copied. |
| * @return |
| * The cloned tube. Always non-null. |
| */ |
| public <T extends Tube> T copy(T t) { |
| Tube r = (Tube)master2copy.get(t); |
| if(r==null) { |
| r = t.copy(this); |
| // the pipe must puts its copy to the map by itself |
| assert master2copy.get(t)==r : "the tube must call the add(...) method to register itself before start copying other pipes, but "+t +" hasn't done so"; |
| } |
| return (T)r; |
| } |
| |
| /** |
| * This method must be called from within the copy constructor |
| * to notify that the copy was created. |
| * |
| * <p> |
| * When your pipe has references to other pipes, |
| * it's particularly important to call this method |
| * before you start copying the pipes you refer to, |
| * or else there's a chance of inifinite loop. |
| */ |
| public void add(Tube original, Tube copy) { |
| assert !master2copy.containsKey(original); |
| assert original!=null && copy!=null; |
| master2copy.put(original,copy); |
| } |
| } |