/**
    * This file Copyright (c) 2003-2018 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.module.delta;
  
  import info.magnolia.module.InstallContext;
  import info.magnolia.repository.RepositoryConstants;
  
  import javax.jcr.RepositoryException;
  
  /**
   * A task that delegates to another depending on whether a specified node exists or not.
   */
  public class NodeExistsDelegateTask extends ConditionalDelegateTask {
      private final String workspaceName;
      private final String pathToCheck;
  
      public NodeExistsDelegateTask(String name, String pathToCheck, Task ifTrue) {
          this(name, pathToCheck, ifTrue, null);
      }
  
      public NodeExistsDelegateTask(String name, String pathToCheck, Taskef="../../../../info/magnolia/module/delta/Task.html#Task">Task ifTrue, Task ifFalse) {
          this(name, String.format("Execute task [%s] if node '%s' exists or [%s] if not.",
                  ifTrue == null ? DO_NOTHING : ifTrue.getDescription(),
                  pathToCheck,
                  ifFalse == null ? DO_NOTHING : ifFalse.getDescription()),
                  RepositoryConstants.CONFIG, pathToCheck, ifTrue, ifFalse);
      }
  
      public NodeExistsDelegateTask(String name, String description, String workspaceName, String pathToCheck, Task ifTrue) {
          this(name, description, workspaceName, pathToCheck, ifTrue, null);
      }
  
      public NodeExistsDelegateTask(String name, String description, String workspaceName, String pathToCheck, Taskef="../../../../info/magnolia/module/delta/Task.html#Task">Task ifTrue, Task ifFalse) {
          super(name, description, ifTrue, ifFalse);
          this.pathToCheck = pathToCheck;
          this.workspaceName = workspaceName;
      }
  
      @Override
      protected boolean condition(InstallContext ctx) {
          try {
              return ctx.getJCRSession(workspaceName).nodeExists(pathToCheck);
          } catch (RepositoryException e) {
              ctx.error("There was an error assessing if the node exists.", e);
              return false;
          }
      }
  }