package org.apache.maven.model.interpolation;
   
   /*
    * 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.HashSet;
  import java.util.Set;
  
  import org.apache.maven.model.path.UrlNormalizer;
  import org.codehaus.plexus.interpolation.InterpolationPostProcessor;
  
  /**
   * Ensures that expressions referring to URLs evaluate to normalized URLs.
   *
   * @author Benjamin Bentmann
   */
  class UrlNormalizingPostProcessor
      implements InterpolationPostProcessor
  {
  
      private static final Set<String> URL_EXPRESSIONS;
  
      static
      {
          Set<String> expressions = new HashSet<>();
          expressions.add( "project.url" );
          expressions.add( "project.scm.url" );
          expressions.add( "project.scm.connection" );
          expressions.add( "project.scm.developerConnection" );
          expressions.add( "project.distributionManagement.site.url" );
  
          URL_EXPRESSIONS = expressions;
      }
  
      private UrlNormalizer normalizer;
  
      UrlNormalizingPostProcessor( UrlNormalizer normalizer )
      {
          this.normalizer = normalizer;
      }
  
      @Override
      public Object execute( String expression, Object value )
      {
          if ( value != null && URL_EXPRESSIONS.contains( expression ) )
          {
              return normalizer.normalize( value.toString() );
          }
  
          return null;
      }
  
  }