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
020package org.crsh.util;
021
022import java.util.concurrent.Callable;
023
024/**
025 * An helper for chaining statements to execute.
026 */
027public 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}