package org.apache.maven.plugin.invoker;

 /*

  * 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 java.util.Collection;

 import java.util.HashMap;

 import java.util.Map;

 import java.util.Set;

 import org.apache.maven.project.MavenProject;

 import org.codehaus.plexus.util.introspection.ReflectionValueExtractor;

 /**

  * A map-like source to interpolate expressions.

  * 

  * @author Olivier Lamy

  * @since 1.1

  * @version $Id: CompositeMap.java 1412649 2012-11-22 19:47:02Z rfscholte $

  */

 class CompositeMap

     implements Map<String, Object>

 {

     /**

      * The Maven project from which to extract interpolated values, never <code>null</code>.

      */

     private MavenProject mavenProject;

     /**

      * The set of additional properties from which to extract interpolated values, never <code>null</code>.

      */

     private Map<String, Object> properties;

     /**

      * Creates a new interpolation source backed by the specified Maven project and some user-specified properties.

      * 

      * @param mavenProject The Maven project from which to extract interpolated values, must not be <code>null</code>.

      * @param properties The set of additional properties from which to extract interpolated values, may be

      *            <code>null</code>.

      */

     protected CompositeMap( MavenProject mavenProject, Map<String, Object> properties )

     {

         if ( mavenProject == null )

         {

             throw new IllegalArgumentException( "no project specified" );

         }

         this.mavenProject = mavenProject;

         this.properties = properties == null ? new HashMap<String, Object>() : properties;

     }

     /**

      * {@inheritDoc}

      * 

      * @see java.util.Map#clear()

      */

     public void clear()

     {

         // nothing here

     }

     /**

      * {@inheritDoc}

      * 

      * @see java.util.Map#containsKey(java.lang.Object)

      */

     public boolean containsKey( Object key )

     {

         if ( !( key instanceof String ) )

         {

             return false;

         }

         String expression = (String) key;

         if ( expression.startsWith( "project." ) || expression.startsWith( "pom." ) )

         {

             try

             {

                 Object evaluated = ReflectionValueExtractor.evaluate( expression, this.mavenProject );

                 if ( evaluated != null )

                 {

                     return true;

                 }

             }

             catch ( Exception e )

             {

                 // uhm do we have to throw a RuntimeException here ?

             }

         }

         return properties.containsKey( key ) || mavenProject.getProperties().containsKey( key );

     }

     /**

      * {@inheritDoc}

      * 

      * @see java.util.Map#containsValue(java.lang.Object)

      */

     public boolean containsValue( Object value )

     {

         throw new UnsupportedOperationException();

     }

     /**

      * {@inheritDoc}

      * 

      * @see java.util.Map#entrySet()

      */

     public Set<Entry<String, Object>> entrySet()

     {

         throw new UnsupportedOperationException();

     }

     /**

      * {@inheritDoc}

      * 

      * @see java.util.Map#get(java.lang.Object)

      */

     public Object get( Object key )

     {

         if ( !( key instanceof String ) )

         {

             return null;

         }

         String expression = (String) key;

         if ( expression.startsWith( "project." ) || expression.startsWith( "pom." ) )

         {

             try

             {

                 Object evaluated = ReflectionValueExtractor.evaluate( expression, this.mavenProject );

                 if ( evaluated != null )

                 {

                     return evaluated;

                 }

             }

             catch ( Exception e )

             {

                 // uhm do we have to throw a RuntimeException here ?

             }

         }

         Object value = properties.get( key );

         return ( value != null ? value : this.mavenProject.getProperties().get( key ) );

     }

     /**

      * {@inheritDoc}

      * 

      * @see java.util.Map#isEmpty()

      */

     public boolean isEmpty()

     {

         return this.mavenProject == null && this.mavenProject.getProperties().isEmpty() && this.properties.isEmpty();

     }

     /**

      * {@inheritDoc}

      * 

      * @see java.util.Map#keySet()

      */

     public Set<String> keySet()

     {

         throw new UnsupportedOperationException();

     }

     /**

      * {@inheritDoc}

      * 

      * @see java.util.Map#put(java.lang.Object, java.lang.Object)

      */

     public Object put( String key, Object value )

     {

         throw new UnsupportedOperationException();

     }

     /**

      * {@inheritDoc}

      * 

      * @see java.util.Map#putAll(java.util.Map)

      */

     public void putAll( Map<? extends String, ? extends Object> t )

     {

         throw new UnsupportedOperationException();

     }

     /**

      * {@inheritDoc}

      * 

      * @see java.util.Map#remove(java.lang.Object)

      */

     public Object remove( Object key )

     {

         throw new UnsupportedOperationException();

     }

     /**

      * {@inheritDoc}

      * 

      * @see java.util.Map#size()

      */

     public int size()

     {

         throw new UnsupportedOperationException();

     }

     /**

      * {@inheritDoc}

      * 

      * @see java.util.Map#values()

      */

     public Collection<Object> values()

     {

         throw new UnsupportedOperationException();

     }

 }