1 /** 2 * This file Copyright (c) 2003-2011 Magnolia International 3 * Ltd. (http://www.magnolia-cms.com). All rights reserved. 4 * 5 * 6 * This file is dual-licensed under both the Magnolia 7 * Network Agreement and the GNU General Public License. 8 * You may elect to use one or the other of these licenses. 9 * 10 * This file is distributed in the hope that it will be 11 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the 12 * implied warranty of MERCHANTABILITY or FITNESS FOR A 13 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT. 14 * Redistribution, except as permitted by whichever of the GPL 15 * or MNA you select, is prohibited. 16 * 17 * 1. For the GPL license (GPL), you can redistribute and/or 18 * modify this file under the terms of the GNU General 19 * Public License, Version 3, as published by the Free Software 20 * Foundation. You should have received a copy of the GNU 21 * General Public License, Version 3 along with this program; 22 * if not, write to the Free Software Foundation, Inc., 51 23 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 24 * 25 * 2. For the Magnolia Network Agreement (MNA), this file 26 * and the accompanying materials are made available under the 27 * terms of the MNA which accompanies this distribution, and 28 * is available at http://www.magnolia-cms.com/mna.html 29 * 30 * Any modifications to this file must keep this entire header 31 * intact. 32 * 33 */ 34 package info.magnolia.module.delta; 35 36 import info.magnolia.module.InstallContext; 37 38 /** 39 * A task that delegates to another if a condition is true, or to an optional other if it is false. 40 * 41 * TODO : get descriptions from delegate + a description of the condition ? 42 * 43 * @author gjoseph 44 * @version $Revision: $ ($Author: $) 45 */ 46 public abstract class ConditionalDelegateTask extends AbstractTask { 47 private final Task ifTrue; 48 private final Task ifFalse; 49 50 protected ConditionalDelegateTask(String taskName, String taskDescription, Task ifTrue) { 51 this(taskName, taskDescription, ifTrue, null); 52 } 53 54 public ConditionalDelegateTask(String taskName, String taskDescription, Task ifTrue, Task ifFalse) { 55 super(taskName, taskDescription); 56 this.ifTrue = ifTrue; 57 this.ifFalse = ifFalse; 58 } 59 60 @Override 61 public void execute(InstallContext ctx) throws TaskExecutionException { 62 final Task task = condition(ctx) ? ifTrue : ifFalse; 63 if (task != null) { 64 task.execute(ctx); 65 } 66 } 67 68 protected abstract boolean condition(InstallContext installContext) throws TaskExecutionException; 69 70 }