package org.apache.maven.toolchain;
   
   /*
    * 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 org.apache.maven.artifact.versioning.DefaultArtifactVersion;
  import org.apache.maven.artifact.versioning.InvalidVersionSpecificationException;
  import org.apache.maven.artifact.versioning.VersionRange;
  
  /**
   *
   * @author mkleint
   */
  public final class RequirementMatcherFactory
  {
      private RequirementMatcherFactory()
      {
      }
  
      public static RequirementMatcher createExactMatcher( String provideValue )
      {
          return new ExactMatcher( provideValue );
      }
  
      public static RequirementMatcher createVersionMatcher( String provideValue )
      {
          return new VersionMatcher( provideValue );
      }
  
      private static final class ExactMatcher
          implements RequirementMatcher
      {
  
          private String provides;
  
          private ExactMatcher( String provides )
          {
              this.provides = provides;
          }
  
          @Override
          public boolean matches( String requirement )
          {
              return provides.equalsIgnoreCase( requirement );
          }
          
          @Override
          public String toString()
          {
              return provides;
          }
      }
  
      private static final class VersionMatcher
          implements RequirementMatcher
      {
          DefaultArtifactVersion version;
  
          private VersionMatcher( String version )
          {
              this.version = new DefaultArtifactVersion( version );
          }
  
          @Override
          public boolean matches( String requirement )
          {
              try
              {
                  VersionRange range = VersionRange.createFromVersionSpec( requirement );
                  if ( range.hasRestrictions() )
                  {
                      return range.containsVersion( version );
                  }
                  else
                  {
                      return range.getRecommendedVersion().compareTo( version ) == 0;
                  }
              }
              catch ( InvalidVersionSpecificationException ex )
              {
                  //TODO error reporting
                  ex.printStackTrace();
                  return false;
             }
         }
         
         @Override
         public String toString()
         {
             return version.toString();
         }
     }
 }