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From: mcconnell@apache.org
To: avalon-cvs@apache.org
Subject: cvs commit:
 avalon/repository/impl/src/java/org/apache/avalon/repository/impl
 ArtifactSequenceParameter.java
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mcconnell    2004/03/03 19:27:44

  Added:       repository/impl/src/java/org/apache/avalon/repository/impl
                        ArtifactSequenceParameter.java
  Log:
  Add support for the addition of factory artifacts in the repository criteria.
  
  Revision  Changes    Path
  1.1                  avalon/repository/impl/src/java/org/apache/avalon/repository/impl/ArtifactSequenceParameter.java
  
  Index: ArtifactSequenceParameter.java
  ===================================================================
  /* 
   * Copyright 2004 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.avalon.repository.impl;
  
  import java.util.ArrayList;
  import java.util.StringTokenizer;
  
  import org.apache.avalon.repository.Artifact;
  
  import org.apache.avalon.util.criteria.Parameter;
  import org.apache.avalon.util.criteria.CriteriaException;
  
  
  /**
   * A parameter descriptor that supports transformation of a 
   * a string to a string array based on a supplied token.
   * 
   * @author <a href="mailto:dev@avalon.apache.org">Avalon Development Team</a>
   * @version $Revision: 1.1 $
   */
  public class ArtifactSequenceParameter extends Parameter
  {
      //--------------------------------------------------------------
      // immutable state
      //--------------------------------------------------------------
  
      private final String m_delimiter;
  
      //--------------------------------------------------------------
      // constructors
      //--------------------------------------------------------------
  
     /**
      * Transform a string to a string array.
      * @param key the parameter key
      * @param delimiter the delimiter character
      * @param defaults the default string array
      */
      public ArtifactSequenceParameter( 
        final String key, final String delimiter, Artifact[] defaults ) 
      {
          super( key, Artifact[].class, defaults );
          m_delimiter = delimiter;
      }
  
     /**
      * Resolve a supplied string or string array to a artifact array value.
      * @param value the value to resolve
      * @exception CriteriaException if an error occurs
      */
      public Object resolve( Object value ) 
        throws CriteriaException
      {
          if( value == null ) return null;
          if( value instanceof Artifact[] )
          {
              return value;
          }
          if( value instanceof String[] )
          {
              String[] specs = (String[]) value;
              Artifact[] artifacts = new Artifact[ specs.length ];
              for( int i=0; i<specs.length; i++ )
              {
                  final String spec = specs[i];
                  artifacts[i] = Artifact.createArtifact( spec );
              }
              return artifacts;
          }
          else if( value instanceof String )
          {
              ArrayList list = new ArrayList();
              String s = (String) value;
              StringTokenizer tokenizer = 
              new StringTokenizer( s, m_delimiter );
              while( tokenizer.hasMoreTokens() )
              {
                 final String spec = tokenizer.nextToken();
                 Artifact artifact = Artifact.createArtifact( spec );
                 list.add( artifact );
              }
              return list.toArray( new Artifact[0] );
          }
          else
          {
              final String error = 
                "Don't know how to transform an instance of [" 
                + value.getClass().getName() 
                + " to a Artifact[].";
              throw new CriteriaException( error );
          }
      }
  }
  
  
  

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