package org.apache.maven.plugin.invoker;

 /*

  * 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.io.File;

 import java.io.IOException;

 import java.io.Reader;

 import java.io.Writer;

 import java.text.SimpleDateFormat;

 import java.util.Collection;

 import java.util.Date;

 import java.util.LinkedHashSet;

 import java.util.Set;

 import java.util.TimeZone;

 import org.apache.maven.artifact.Artifact;

 import org.codehaus.plexus.util.IOUtil;

 import org.codehaus.plexus.util.ReaderFactory;

 import org.codehaus.plexus.util.WriterFactory;

 import org.codehaus.plexus.util.xml.Xpp3Dom;

 import org.codehaus.plexus.util.xml.Xpp3DomBuilder;

 import org.codehaus.plexus.util.xml.Xpp3DomUtils;

 import org.codehaus.plexus.util.xml.Xpp3DomWriter;

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

 /**

  * Provides utility methods for artifact metadata processing.

  * 

  * @author Benjamin Bentmann

  */

 class MetadataUtils

 {

     /**

      * Creates local metadata files for the specified artifact. The goal is to simulate the installation of the artifact

      * by a local build, thereby decoupling the forked builds from the inderministic collection of remote repositories

      * that are available to the main build and from which the artifact was originally resolved.

      * 

      * @param file The artifact's file in the local test repository, must not be <code>null</code>.

      * @param artifact The artifact to create metadata for, must not be <code>null</code>.

      * @throws IOException If the metadata could not be created.

      */

     public static void createMetadata( File file, Artifact artifact )

         throws IOException

     {

         TimeZone tz = java.util.TimeZone.getTimeZone( "UTC" );

         SimpleDateFormat fmt = new SimpleDateFormat( "yyyyMMddHHmmss" );

         fmt.setTimeZone( tz );

         String timestamp = fmt.format( new Date() );

         if ( artifact.isSnapshot() )

         {

             File metadataFile = new File( file.getParentFile(), "maven-metadata-local.xml" );

             Xpp3Dom metadata = new Xpp3Dom( "metadata" );

             addChild( metadata, "groupId", artifact.getGroupId() );

             addChild( metadata, "artifactId", artifact.getArtifactId() );

             addChild( metadata, "version", artifact.getBaseVersion() );

             Xpp3Dom versioning = new Xpp3Dom( "versioning" );

             versioning.addChild( addChild( new Xpp3Dom( "snapshot" ), "localCopy", "true" ) );

             addChild( versioning, "lastUpdated", timestamp );

             metadata.addChild( versioning );

             writeMetadata( metadataFile, metadata );

         }

         {

             File metadataFile = new File( file.getParentFile().getParentFile(), "maven-metadata-local.xml" );

             Set<String> allVersions = new LinkedHashSet<String>();

             Xpp3Dom metadata = readMetadata( metadataFile );

             if ( metadata != null )

             {

                 Xpp3Dom versioning = metadata.getChild( "versioning" );

                 if ( versioning != null )

                 {

                     Xpp3Dom versions = versioning.getChild( "versions" );

                     if ( versions != null )

                     {

                         Xpp3Dom[] children = versions.getChildren( "version" );

                         for ( int i = 0; i < children.length; i++ )

                         {

                             allVersions.add( children[i].getValue() );

                         }

                     }

                 }

             }

             allVersions.add( artifact.getBaseVersion() );

             metadata = new Xpp3Dom( "metadata" );

             addChild( metadata, "groupId", artifact.getGroupId() );

             addChild( metadata, "artifactId", artifact.getArtifactId() );

             Xpp3Dom versioning = new Xpp3Dom( "versioning" );

             versioning.addChild( addChildren( new Xpp3Dom( "versions" ), "version", allVersions ) );

             addChild( versioning, "lastUpdated", timestamp );

             metadata.addChild( versioning );

             metadata = Xpp3DomUtils.mergeXpp3Dom( metadata, readMetadata( metadataFile ) );

             writeMetadata( metadataFile, metadata );

         }

     }

     private static Xpp3Dom addChild( Xpp3Dom parent, String childName, String childValue )

     {

         Xpp3Dom child = new Xpp3Dom( childName );

         child.setValue( childValue );

         parent.addChild( child );

         return parent;

     }

     private static Xpp3Dom addChildren( Xpp3Dom parent, String childName, Collection<String> childValues )

     {

         for ( String childValue : childValues )

         {

             addChild( parent, childName, childValue );

         }

         return parent;

     }

     private static Xpp3Dom readMetadata( File metadataFile )

         throws IOException

     {

         if ( !metadataFile.isFile() )

         {

             return null;

         }

         Reader reader = ReaderFactory.newXmlReader( metadataFile );

         try

         {

             try

             {

                 return Xpp3DomBuilder.build( reader );

             }

             catch ( XmlPullParserException e )

             {

                 throw (IOException) new IOException( e.getMessage() ).initCause( e );

             }

         }

         finally

         {

             IOUtil.close( reader );

         }

     }

     private static void writeMetadata( File metadataFile, Xpp3Dom metadata )

         throws IOException

     {

         metadataFile.getParentFile().mkdirs();

         Writer writer = WriterFactory.newXmlWriter( metadataFile );

         try

         {

             Xpp3DomWriter.write( writer, metadata );

         }

         finally

         {

             IOUtil.close( writer );

         }

     }

 }