package org.apache.maven.shared.dependency.tree.traversal;

 /*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you 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.

  */

 import org.apache.maven.shared.dependency.tree.DependencyNode;

 import org.apache.maven.shared.dependency.tree.filter.DependencyNodeFilter;

 /**

  * A dependency node visitor that filters nodes and delegates to another visitor.

  * 

  * @author <a href="mailto:markhobson@gmail.com">Mark Hobson</a>

  * @version $Id: FilteringDependencyNodeVisitor.java 1100703 2011-05-08 08:27:33Z hboutemy $

  * @since 1.1

  */

 public class FilteringDependencyNodeVisitor

     implements DependencyNodeVisitor

 {

     // fields -----------------------------------------------------------------

     /**

      * The dependency node visitor to delegate to.

      */

     private final DependencyNodeVisitor visitor;

     /**

      * The dependency node filter to apply before delegation.

      */

     private final DependencyNodeFilter filter;

     // constructors -----------------------------------------------------------

     /**

      * Creates a dependency node visitor that delegates nodes that are accepted by the specified filter to the specified

      * visitor.

      * 

      * @param visitor

      *            the dependency node visitor to delegate to

      * @param filter

      *            the dependency node filter to apply before delegation

      */

     public FilteringDependencyNodeVisitor( DependencyNodeVisitor visitor, DependencyNodeFilter filter )

     {

         this.visitor = visitor;

         this.filter = filter;

     }

     // DependencyNodeVisitor methods ------------------------------------------

     /**

      * {@inheritDoc}

      */

     public boolean visit( DependencyNode node )

     {

         boolean visit;

         if ( filter.accept( node ) )

         {

             visit = visitor.visit( node );

         }

         else

         {

             visit = true;

         }

         return visit;

     }

     /**

      * {@inheritDoc}

      */

     public boolean endVisit( DependencyNode node )

     {

         boolean visit;

         if ( filter.accept( node ) )

         {

             visit = visitor.endVisit( node );

         }

         else

         {

             visit = true;

         }

         return visit;

     }

     // public methods ---------------------------------------------------------

     /**

      * Gets the dependency node visitor that this visitor delegates to.

      * 

      * @return the dependency node visitor

      */

     public DependencyNodeVisitor getDependencyNodeVisitor()

     {

         return visitor;

     }

     /**

      * Gets the dependency node filter that this visitor applies before delegation.

      * 

      * @return the dependency node filter

      */

     public DependencyNodeFilter getDependencyNodeFilter()

     {

         return filter;

     }

 }