package org.apache.maven.plugin.war.util;

 /*

  * 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.Collections;

 import java.util.List;

 import java.util.Properties;

 import org.apache.maven.artifact.Artifact;

 import org.codehaus.plexus.interpolation.InterpolationException;

 import org.codehaus.plexus.interpolation.ObjectBasedValueSource;

 import org.codehaus.plexus.interpolation.PropertiesBasedValueSource;

 import org.codehaus.plexus.interpolation.RegexBasedInterpolator;

 import org.codehaus.plexus.interpolation.ValueSource;

 /**

  * Utilities used to evaluate expression.

  * <p/>

  * TODO: this comes from the assembly plugin; refactor when it's shared.

  * <p/>

  * The expression might use any field of the {@link Artifact} interface. Some

  * examples might be:

  * <ul>

  * <li>@{artifactId}@-@{version}@@{dashClassifier?}@.@{extension}@</li>

  * <li>@{artifactId}@-@{version}@.@{extension}@</li>

  * <li>@{artifactId}@.@{extension}@</li>

  * </ul>

  *

  * @author Stephane Nicoll

  * @version $Id: MappingUtils.java 947587 2010-05-24 10:17:47Z dennisl $

  */

 public class MappingUtils

 {

     /**

      * Evaluates the specified expression for the given artifact.

      *

      * @param expression the expression to evaluate

      * @param artifact   the artifact to use as value object for tokens

      * @return expression the evaluated expression

      */

     public static String evaluateFileNameMapping( String expression, Artifact artifact )

         throws InterpolationException

     {

         String value = expression;

         // FIXME: This is BAD! Accessors SHOULD NOT change the behavior of the object.

         artifact.isSnapshot();

         RegexBasedInterpolator interpolator = new RegexBasedInterpolator( "\\@\\{(", ")?([^}]+)\\}@" );

         interpolator.addValueSource( new ObjectBasedValueSource( artifact ) );

         interpolator.addValueSource( new ObjectBasedValueSource( artifact.getArtifactHandler() ) );

         Properties classifierMask = new Properties();

         classifierMask.setProperty( "classifier", "" );

         // Support for special expressions, like @{dashClassifier?}@, see MWAR-212

         String classifier = artifact.getClassifier();

         if ( classifier != null )

         {

             classifierMask.setProperty( "dashClassifier?", "-" + classifier );

             classifierMask.setProperty( "dashClassifier", "-" + classifier );

         }

         else

         {

             classifierMask.setProperty( "dashClassifier?", "" );

             classifierMask.setProperty( "dashClassifier", "" );

         }

         interpolator.addValueSource( new PropertiesBasedValueSource ( classifierMask ) );

         value = interpolator.interpolate( value, "__artifact" );

         return value;

     }

     /**

      * Internal implementation of {@link ValueSource}

      */

     static class PropertiesInterpolationValueSource

         implements ValueSource

     {

         private final Properties properties;

         public PropertiesInterpolationValueSource( Properties properties )

         {

             this.properties = properties;

         }

         public Object getValue( String key )

         {

             return properties.getProperty( key );

         }

         public void clearFeedback()

         {

             // nothing here

         }

         public List getFeedback()

         {

             // nothing here just NPE free

             return Collections.EMPTY_LIST;

         }

     }

 }