/*
    * 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.
   */
  package org.apache.maven.repository.metadata;
  
  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 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();
     }
 
     // ---------------------------------------------------------------------
     // ---------------------------------------------------------------------
 }