001 /*
002 * Copyright (C) 2012 eXo Platform SAS.
003 *
004 * This is free software; you can redistribute it and/or modify it
005 * under the terms of the GNU Lesser General Public License as
006 * published by the Free Software Foundation; either version 2.1 of
007 * the License, or (at your option) any later version.
008 *
009 * This software is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * You should have received a copy of the GNU Lesser General Public
015 * License along with this software; if not, write to the Free
016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018 */
019
020 package org.crsh.util;
021
022 import java.util.concurrent.Callable;
023
024 /**
025 * An helper for chaining statements to execute.
026 */
027 public abstract class Statement {
028
029 /** . */
030 private Statement next;
031
032 protected abstract void run() throws Throwable;
033
034 public Statement with(final Runnable runnable) {
035 return with(new Statement() {
036 @Override
037 protected void run() throws Throwable {
038 runnable.run();
039 }
040 });
041 }
042
043 public Statement with(final Callable<?> callable) {
044 return with(new Statement() {
045 @Override
046 protected void run() throws Throwable {
047 callable.call();
048 }
049 });
050 }
051
052 public Statement with(Statement callback) {
053 if (next != null) {
054 next.with(callback);
055 } else {
056 next = callback;
057 }
058 return this;
059 }
060
061 public void all() {
062 try {
063 run();
064 }
065 catch (Throwable ignore) {
066 }
067 if (next != null) {
068 next.all();
069 }
070 }
071 }