/*

  * Copyright 1999-2001,2004 The Apache Software Foundation.

  * 

  * Licensed under the Apache License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  * 

  *      http://www.apache.org/licenses/LICENSE-2.0

  * 

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */ 

 package org.apache.commons.workflow.base;

 import java.util.ArrayList;

 import org.apache.commons.workflow.Activity;

 import org.apache.commons.workflow.Context;

 import org.apache.commons.workflow.Descriptor;

 import org.apache.commons.workflow.Descriptors;

 import org.apache.commons.workflow.Step;

 import org.apache.commons.workflow.StepException;

 /**

  * <p><strong>DescriptorStep</strong> is a convenient base class for more

  * sophisticated <code>Step</code> implementations that already support

  * the APIs provided by <code>BaseStep</code>, and also implement the

  * <code>Descriptors</code> interafce.

  *

  * @version $Revision: 155475 $ $Date: 2005-02-26 13:31:11 +0000 (Sat, 26 Feb 2005) $

  * @author Craig R. McClanahan

  */

 public abstract class DescriptorStep extends BaseStep implements Descriptors {

     // ----------------------------------------------------- Instance Variables

     /**

      * The list of <code>Descriptor</code> objects associated with this

      * <code>Step</code>.

      */

     protected ArrayList descriptors = new ArrayList();

     // --------------------------------------------------------- Public Methods

     /**

      * Add a new <code>Descriptor</code> to the set associated with

      * this object.

      *

      * @param descriptor The Descriptor to be added

      */

     public void addDescriptor(Descriptor descriptor) {

         descriptors.add(descriptor);

     }

     /**

      * Return the set of <code>Descriptor</code> objects associated with

      * this object, in the order that they were originally added.

      */

     public Descriptor[] findDescriptors() {

         Descriptor results[] = new Descriptor[descriptors.size()];

         return ((Descriptor[]) descriptors.toArray(results));

     }

     /**

      * Remove an existing <code>Descriptor</code> from the set associated

      * with this object.

      *

      * @param descriptor The Descriptor to be removed

      */

     public void removeDescriptor(Descriptor descriptor) {

         descriptors.remove(descriptor);

     }

 }