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 }