package org.apache.maven.repository.metadata;
   
   /*
    * 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.ArtifactScopeEnum;
  
  /**
   * metadata graph vertice - just a wrapper around artifact's metadata
   *
   * @author <a href="oleg@codehaus.org">Oleg Gusakov</a>
   */
  public class MetadataGraphVertex
      implements Comparable<MetadataGraphVertex>
  {
      ArtifactMetadata md;
  
      // indications to use these in comparison
      private boolean compareVersion = false;
      private boolean compareScope   = false;
  
      public MetadataGraphVertex( ArtifactMetadata md )
      {
          super();
          this.md = md;
      }
  
      public MetadataGraphVertex( ArtifactMetadata md, boolean compareVersion, boolean compareScope )
      {
          this( md );
          this.compareVersion = compareVersion;
          this.compareScope = compareScope;
      }
  
      public ArtifactMetadata getMd()
      {
          return md;
      }
  
      public void setMd( ArtifactMetadata md )
      {
          this.md = md;
      }
  
      // ---------------------------------------------------------------------
      public boolean isCompareVersion()
      {
          return compareVersion;
      }
  
      public void setCompareVersion( boolean compareVersion )
      {
          this.compareVersion = compareVersion;
      }
  
      public boolean isCompareScope()
      {
          return compareScope;
      }
  
      public void setCompareScope( boolean compareScope )
      {
          this.compareScope = compareScope;
      }
  
      // ---------------------------------------------------------------------
      @Override
      public String toString()
      {
          return "[" + ( md == null ? "no metadata" : md.toString() ) + "]";
      }
  
      // ---------------------------------------------------------------------
      private static int compareStrings( String s1, String s2 )
      {
          if ( s1 == null && s2 == null )
          {
              return 0;
          }
  
          if ( s1 == null /* && s2 != null */ )
          {
              return -1;
         }
 
         if ( /* s1 != null && */ s2 == null )
         {
             return 1;
         }
 
         return s1.compareTo( s2 );
     }
 
     // ---------------------------------------------------------------------
     public int compareTo( MetadataGraphVertex vertex )
     {
         if ( vertex == null || vertex.getMd() == null )
         {
             return 1;
         }
 
         ArtifactMetadata vmd = vertex.getMd();
 
         if ( vmd == null )
         {
             if ( md == null )
             {
                 return 0;
             }
             else
             {
                 return 1;
             }
         }
 
         int g = compareStrings( md.groupId, vmd.groupId );
 
         if ( g == 0 )
         {
             int a = compareStrings( md.artifactId, vmd.artifactId );
             if ( a == 0 )
             {
                 if ( compareVersion )
                 {
                     int v = compareStrings( md.version, vmd.version );
                     if ( v == 0 )
                     {
                         if ( compareScope )
                         {
                             String s1 = ArtifactScopeEnum.checkScope( md.artifactScope ).getScope();
                             String s2 = ArtifactScopeEnum.checkScope( vmd.artifactScope ).getScope();
                             return s1.compareTo( s2 );
                         }
                         else
                         {
                             return 0;
                         }
                     }
                     else
                     {
                         return v;
                     }
                 }
                 else
                 {
                     return 0;
                 }
             }
             else
             {
                 return a;
             }
         }
 
         return g;
     }
 
     // ---------------------------------------------------------------------
     @Override
     public boolean equals( Object vo )
     {
         if ( vo == null || !( vo instanceof MetadataGraphVertex ) )
         {
             return false;
         }
         return compareTo( (MetadataGraphVertex) vo ) == 0;
     }
 
     // ---------------------------------------------------------------------
 
     @Override
     public int hashCode()
     {
         if ( md == null )
         {
             return super.hashCode();
         }
         StringBuilder hashString = new StringBuilder( 128 );
         hashString.append( md.groupId ).append( '|' );
         hashString.append( md.artifactId ).append( '|' );
 
         if ( compareVersion )
         {
             hashString.append( md.version ).append( '|' );
         }
 
         if ( compareScope )
         {
             hashString.append( md.getArtifactScope() ).append( '|' );
         }
 
         return hashString.toString().hashCode();
 
         // BASE64Encoder b64 = new BASE64Encoder();
         // return b64.encode( hashString.toString().getBytes() ).hashCode();
     }
 
     // ---------------------------------------------------------------------
     // ---------------------------------------------------------------------
 }