package org.apache.maven.artifact;
   
   /*
    * 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.ArrayList;
  import java.util.Collection;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.regex.Matcher;
  
  import org.apache.maven.artifact.versioning.VersionRange;
  
  public final class ArtifactUtils
  {
  
      public static boolean isSnapshot( String version )
      {
          if ( version != null )
          {
              if ( version.regionMatches( true, version.length() - Artifact.SNAPSHOT_VERSION.length(),
                                          Artifact.SNAPSHOT_VERSION, 0, Artifact.SNAPSHOT_VERSION.length() ) )
              {
                  return true;
              }
              else if ( Artifact.VERSION_FILE_PATTERN.matcher( version ).matches() )
              {
                  return true;
              }
          }
          return false;
      }
  
      public static String toSnapshotVersion( String version )
      {
          if ( version == null )
          {
              throw new IllegalArgumentException( "version: null" );
          }
  
          Matcher m = Artifact.VERSION_FILE_PATTERN.matcher( version );
          if ( m.matches() )
          {
              return m.group( 1 ) + "-" + Artifact.SNAPSHOT_VERSION;
          }
          else
          {
              return version;
          }
      }
  
      public static String versionlessKey( Artifact artifact )
      {
          return versionlessKey( artifact.getGroupId(), artifact.getArtifactId() );
      }
  
      public static String versionlessKey( String groupId, String artifactId )
      {
          if ( groupId == null )
          {
              throw new NullPointerException( "groupId is null" );
          }
          if ( artifactId == null )
          {
              throw new NullPointerException( "artifactId is null" );
          }
          return groupId + ":" + artifactId;
      }
  
      public static String key( Artifact artifact )
      {
          return key( artifact.getGroupId(), artifact.getArtifactId(), artifact.getVersion() );
      }
  
      public static String key( String groupId, String artifactId, String version )
      {
          if ( groupId == null )
          {
              throw new NullPointerException( "groupId is null" );
          }
          if ( artifactId == null )
          {
             throw new NullPointerException( "artifactId is null" );
         }
         if ( version == null )
         {
             throw new NullPointerException( "version is null" );
         }
 
         return groupId + ":" + artifactId + ":" + version;
     }
 
     public static Map<String, Artifact> artifactMapByVersionlessId( Collection<Artifact> artifacts )
     {
         Map<String, Artifact> artifactMap = new LinkedHashMap<String, Artifact>();
 
         if ( artifacts != null )
         {
             for ( Artifact artifact : artifacts )
             {
                 artifactMap.put( versionlessKey( artifact ), artifact );
             }
         }
 
         return artifactMap;
     }
 
     public static Artifact copyArtifactSafe( Artifact artifact )
     {
         return ( artifact != null ) ? copyArtifact( artifact ) : null;
     }
 
     public static Artifact copyArtifact( Artifact artifact )
     {
         VersionRange range = artifact.getVersionRange();
 
         // For some reason with the introduction of MNG-1577 we have the case in Yoko where a depMan section has
         // something like the following:
         //
         // <dependencyManagement>
         //     <dependencies>
         //         <!--  Yoko modules -->
         //         <dependency>
         //             <groupId>org.apache.yoko</groupId>
         //             <artifactId>yoko-core</artifactId>
         //             <version>${version}</version>
         //         </dependency>
         // ...
         //
         // And the range is not set so we'll check here and set it. jvz.
 
         if ( range == null )
         {
             range = VersionRange.createFromVersion( artifact.getVersion() );
         }
 
         DefaultArtifact clone = new DefaultArtifact( artifact.getGroupId(), artifact.getArtifactId(), range.cloneOf(),
             artifact.getScope(), artifact.getType(), artifact.getClassifier(),
             artifact.getArtifactHandler(), artifact.isOptional() );
         clone.setRelease( artifact.isRelease() );
         clone.setResolvedVersion( artifact.getVersion() );
         clone.setResolved( artifact.isResolved() );
         clone.setFile( artifact.getFile() );
 
         clone.setAvailableVersions( copyList( artifact.getAvailableVersions() ) );
         if ( artifact.getVersion() != null )
         {
             clone.setBaseVersion( artifact.getBaseVersion() );
         }
         clone.setDependencyFilter( artifact.getDependencyFilter() );
         clone.setDependencyTrail( copyList( artifact.getDependencyTrail() ) );
         clone.setDownloadUrl( artifact.getDownloadUrl() );
         clone.setRepository( artifact.getRepository() );
 
         return clone;
     }
 
     /** Returns <code>to</code> collection */
     public static <T extends Collection<Artifact>> T copyArtifacts( Collection<Artifact> from, T to )
     {
         for ( Artifact artifact : from )
         {
             to.add( ArtifactUtils.copyArtifact( artifact ) );
         }
         return to;
     }
 
     public static <K, T extends Map<K, Artifact>> T copyArtifacts( Map<K, ? extends Artifact> from, T to )
     {
         if ( from != null )
         {
             for ( Map.Entry<K, ? extends Artifact> entry : from.entrySet() )
             {
                 to.put( entry.getKey(), ArtifactUtils.copyArtifact( entry.getValue() ) );
             }
         }
 
         return to;
     }
 
     private static <T> List<T> copyList( List<T> original )
     {
         List<T> copy = null;
 
         if ( original != null )
         {
             copy = new ArrayList<T>();
 
             if ( !original.isEmpty() )
             {
                 copy.addAll( original );
             }
         }
 
         return copy;
     }
 
 }