/*

  * 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.

  */

 package org.apache.myfaces.view.facelets.compiler;

 import java.util.ArrayList;

 import java.util.List;

 import org.apache.myfaces.view.facelets.tag.TagLibrary;

 /**

  * @author Jacob Hookom

  * @version $Id$

  */

 final class NamespaceManager

 {

     private final static class NS

     {

         public final String prefix;

         public final String namespace;

         public NS(String prefix, String ns)

         {

             this.prefix = prefix;

             this.namespace = ns;

         }

     }

     private final List<NS> namespaces;

     /**

      * 

      */

     public NamespaceManager()

     {

         this.namespaces = new ArrayList<NS>();

     }

     public void reset()

     {

         this.namespaces.clear();

     }

     public void pushNamespace(String prefix, String namespace)

     {

         NS ns = new NS(prefix, namespace);

         this.namespaces.add(0, ns);

     }

     public String getNamespace(String prefix)

     {

         NS ns = null;

         for (int i = 0; i < this.namespaces.size(); i++)

         {

             ns = (NS) this.namespaces.get(i);

             if (ns.prefix.equals(prefix))

             {

                 return ns.namespace;

             }

         }

         return null;

     }

     public void popNamespace(String prefix)

     {

         NS ns = null;

         for (int i = 0; i < this.namespaces.size(); i++)

         {

             ns = (NS) this.namespaces.get(i);

             if (ns.prefix.equals(prefix))

             {

                 this.namespaces.remove(i);

                 return;

             }

         }

     }

     public NamespaceUnit toNamespaceUnit(TagLibrary library)

     {

         NamespaceUnit unit = new NamespaceUnit(library);

         if (this.namespaces.size() > 0)

         {

             NS ns = null;

             for (int i = this.namespaces.size() - 1; i >= 0; i--)

             {

                 ns = this.namespaces.get(i);

                 unit.setNamespace(ns.prefix, ns.namespace);

             }

         }

         return unit;

     }

 }