package org.apache.maven.artifact.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.Artifact;

 import org.apache.maven.artifact.metadata.ArtifactMetadata;

 import org.apache.maven.artifact.repository.ArtifactRepository;

 import org.apache.maven.artifact.repository.metadata.io.xpp3.MetadataXpp3Reader;

 import org.apache.maven.artifact.repository.metadata.io.xpp3.MetadataXpp3Writer;

 import org.codehaus.plexus.util.IOUtil;

 import org.codehaus.plexus.util.ReaderFactory;

 import org.codehaus.plexus.util.WriterFactory;

 import org.codehaus.plexus.util.xml.pull.XmlPullParserException;

 import java.io.File;

 import java.io.IOException;

 import java.io.Reader;

 import java.io.Writer;

 /**

  * Shared methods of the repository metadata handling.

  *

  * @author <a href="mailto:brett@apache.org">Brett Porter</a>

  * @version $Id: AbstractRepositoryMetadata.java 640549 2008-03-24 20:05:11Z bentmann $

  */

 public abstract class AbstractRepositoryMetadata

     implements RepositoryMetadata

 {

     private Metadata metadata;

     protected AbstractRepositoryMetadata( Metadata metadata )

     {

         this.metadata = metadata;

     }

     public String getRemoteFilename()

     {

         return "maven-metadata.xml";

     }

     public String getLocalFilename( ArtifactRepository repository )

     {

         return "maven-metadata-" + repository.getKey() + ".xml";

     }

     public void storeInLocalRepository( ArtifactRepository localRepository, ArtifactRepository remoteRepository )

         throws RepositoryMetadataStoreException

     {

         try

         {

             updateRepositoryMetadata( localRepository, remoteRepository );

         }

         catch ( IOException e )

         {

             throw new RepositoryMetadataStoreException( "Error updating group repository metadata", e );

         }

         catch ( XmlPullParserException e )

         {

             throw new RepositoryMetadataStoreException( "Error updating group repository metadata", e );

         }

     }

     protected void updateRepositoryMetadata( ArtifactRepository localRepository, ArtifactRepository remoteRepository )

         throws IOException, XmlPullParserException

     {

         MetadataXpp3Reader mappingReader = new MetadataXpp3Reader();

         Metadata metadata = null;

         File metadataFile = new File( localRepository.getBasedir(),

                                       localRepository.pathOfLocalRepositoryMetadata( this, remoteRepository ) );

         if ( metadataFile.exists() )

         {

             Reader reader = null;

             try

             {

                 reader = ReaderFactory.newXmlReader( metadataFile );

                 metadata = mappingReader.read( reader, false );

             }

             finally

             {

                 IOUtil.close( reader );

             }

         }

         boolean changed;

         // If file could not be found or was not valid, start from scratch

         if ( metadata == null )

         {

             metadata = this.metadata;

             changed = true;

         }

         else

         {

             changed = metadata.merge( this.metadata );

         }

         // beware meta-versions!

         String version = metadata.getVersion();

         if ( version != null && ( Artifact.LATEST_VERSION.equals( version ) || Artifact.RELEASE_VERSION.equals( version ) ) )

         {

             // meta-versions are not valid <version/> values...don't write them.

             metadata.setVersion( null );

         }

         if ( changed || !metadataFile.exists() )

         {

             Writer writer = null;

             try

             {

                 metadataFile.getParentFile().mkdirs();

                 writer = WriterFactory.newXmlWriter( metadataFile );

                 MetadataXpp3Writer mappingWriter = new MetadataXpp3Writer();

                 mappingWriter.write( writer, metadata );

             }

             finally

             {

                 IOUtil.close( writer );

             }

         }

         else

         {

             metadataFile.setLastModified( System.currentTimeMillis() );

         }

     }

     public String toString()

     {

         return "repository metadata for: \'" + getKey() + "\'";

     }

     protected static Metadata createMetadata( Artifact artifact, Versioning versioning )

     {

         Metadata metadata = new Metadata();

         metadata.setGroupId( artifact.getGroupId() );

         metadata.setArtifactId( artifact.getArtifactId() );

         metadata.setVersion( artifact.getVersion() );

         metadata.setVersioning( versioning );

         return metadata;

     }

     protected static Versioning createVersioning( Snapshot snapshot )

     {

         Versioning versioning = new Versioning();

         versioning.setSnapshot( snapshot );

         versioning.updateTimestamp();

         return versioning;

     }

     public void setMetadata( Metadata metadata )

     {

         this.metadata = metadata;

     }

     public Metadata getMetadata()

     {

         return metadata;

     }

     public void merge( ArtifactMetadata metadata )

     {

         // TODO: not sure that it should assume this, maybe the calls to addMetadata should pre-merge, then artifact replaces?

         AbstractRepositoryMetadata repoMetadata = (AbstractRepositoryMetadata) metadata;

         this.metadata.merge( repoMetadata.getMetadata() );

     }

     public String extendedToString()

     {

         StringBuffer buffer = new StringBuffer();

         buffer.append( "\nRepository Metadata\n--------------------------" );

         buffer.append( "\nGroupId: " ).append( getGroupId() );

         buffer.append( "\nArtifactId: " ).append( getArtifactId() );

         buffer.append( "\nMetadata Type: " ).append( getClass().getName() );

         return buffer.toString();

     }

 }