tools/maven-bundle-plugin/src/main/java/org/apache/felix/obrplugin/ObrRemoteClean.java - felix - Git at Google

 /*
  * 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.felix.obrplugin;


 import java.io.BufferedReader;
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.net.MalformedURLException;
 import java.net.URI;
 import java.net.URL;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Date;
 import java.util.List;
 import java.util.Properties;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;

 import javax.xml.parsers.DocumentBuilder;
 import javax.xml.parsers.DocumentBuilderFactory;
 import javax.xml.parsers.ParserConfigurationException;
 import javax.xml.transform.Result;
 import javax.xml.transform.Transformer;
 import javax.xml.transform.TransformerConfigurationException;
 import javax.xml.transform.TransformerException;
 import javax.xml.transform.TransformerFactory;
 import javax.xml.transform.dom.DOMSource;
 import javax.xml.transform.stream.StreamResult;

 import org.apache.maven.artifact.manager.WagonManager;
 import org.apache.maven.artifact.repository.ArtifactRepository;
 import org.apache.maven.plugin.AbstractMojo;
 import org.apache.maven.plugin.MojoExecutionException;
 import org.apache.maven.plugin.logging.Log;
 import org.apache.maven.plugins.annotations.Component;
 import org.apache.maven.plugins.annotations.LifecyclePhase;
 import org.apache.maven.plugins.annotations.Mojo;
 import org.apache.maven.plugins.annotations.Parameter;
 import org.apache.maven.project.MavenProject;
 import org.apache.maven.settings.Settings;
 import org.w3c.dom.Document;
 import org.w3c.dom.Element;
 import org.w3c.dom.Node;
 import org.w3c.dom.NodeList;
 import org.xml.sax.SAXException;


 /**
  * Clean a remote repository file.
  * It just looks for every resources and check that pointed file exists.
  *
  * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a>
  */
 @Mojo( name = "remote-clean", requiresProject = false, defaultPhase = LifecyclePhase.CLEAN )
 public final class ObrRemoteClean extends AbstractMojo
 {
     /**
      * When true, ignore remote locking.
      */
     @Parameter( property = "ignoreLock" )
     private boolean ignoreLock;

     /**
      * Optional public URL prefix for the remote repository.
      */
     @Parameter( property = "prefixUrl" )
     private String prefixUrl;

     /**
      * Remote OBR Repository.
      */
     @Parameter( property = "remoteOBR", defaultValue = "NONE" )
     private String remoteOBR;

     /**
      * Local OBR Repository.
      */
     @Parameter( property = "obrRepository" )
     private String obrRepository;

     /**
      * Project types which this plugin supports.
      */
     @Parameter
     private List supportedProjectTypes = Arrays.asList( new String[]
         { "jar", "bundle" } );

     @Parameter( defaultValue = "${project.distributionManagementArtifactRepository}", readonly = true )
     private ArtifactRepository deploymentRepository;

     /**
      * Alternative deployment repository. Format: id::layout::url
      */
     @Parameter( property = "altDeploymentRepository" )
     private String altDeploymentRepository;

     /**
      * OBR specific deployment repository. Format: id::layout::url
      */
     @Parameter( property = "obrDeploymentRepository" )
     private String obrDeploymentRepository;

     @Parameter( defaultValue = "${settings.interactiveMode}", readonly = true )
     private boolean interactive;

     /**
      * The Maven project.
      */
     @Parameter( defaultValue = "${project}", readonly = true, required = true )
     private MavenProject project;

     /**
      * Local Maven settings.
      */
     @Parameter( defaultValue = "${settings}", readonly = true, required = true )
     private Settings settings;

     /**
      * The Wagon manager.
      */
     @Component
     private WagonManager m_wagonManager;


     public void execute() throws MojoExecutionException
     {
         String projectType = project.getPackaging();

         // ignore unsupported project types, useful when bundleplugin is configured in parent pom
         if ( !supportedProjectTypes.contains( projectType ) )
         {
             getLog().warn(
                 "Ignoring project type " + projectType + " - supportedProjectTypes = " + supportedProjectTypes );
             return;
         }
         else if ( "NONE".equalsIgnoreCase( remoteOBR ) || "false".equalsIgnoreCase( remoteOBR ) )
         {
             getLog().info( "Remote OBR update disabled (enable with -DremoteOBR)" );
             return;
         }

         // if the user doesn't supply an explicit name for the remote OBR file, use the local name instead
         if ( null == remoteOBR || remoteOBR.trim().length() == 0 || "true".equalsIgnoreCase( remoteOBR ) )
         {
             remoteOBR = obrRepository;
         }

         URI tempURI = ObrUtils.findRepositoryXml( "", remoteOBR );
         String repositoryName = new File( tempURI.getSchemeSpecificPart() ).getName();

         Log log = getLog();

         RemoteFileManager remoteFile = new RemoteFileManager( m_wagonManager, settings, log );
         openRepositoryConnection( remoteFile );
         if ( null == prefixUrl )
         {
             prefixUrl = remoteFile.toString();
         }

         // ======== LOCK REMOTE OBR ========
         log.info( "LOCK " + remoteFile + '/' + repositoryName );
         remoteFile.lockFile( repositoryName, ignoreLock );
         File downloadedRepositoryXml = null;

         try
         {
             // ======== DOWNLOAD REMOTE OBR ========
             log.info( "Downloading " + repositoryName );
             downloadedRepositoryXml = remoteFile.get( repositoryName, ".xml" );

             URI repositoryXml = downloadedRepositoryXml.toURI();

             Config userConfig = new Config();
             userConfig.setRemoteFile( true );

             // Clean the downloaded file.
             Document doc = parseFile( new File( repositoryXml ), initConstructor() );
             Node finalDocument = cleanDocument( doc.getDocumentElement() );

             if ( finalDocument == null )
             {
                 getLog().info( "Nothing to clean in " + repositoryName );
             }
             else
             {
                 writeToFile( repositoryXml, finalDocument ); // Write the new file
                 getLog().info( "Repository " + repositoryName + " cleaned" );
                 // ======== UPLOAD MODIFIED OBR ========
                 log.info( "Uploading " + repositoryName );
                 remoteFile.put( downloadedRepositoryXml, repositoryName );
             }
         }
         catch ( Exception e )
         {
             log.warn( "Exception while updating remote OBR: " + e.getLocalizedMessage(), e );
         }
         finally
         {
             // ======== UNLOCK REMOTE OBR ========
             log.info( "UNLOCK " + remoteFile + '/' + repositoryName );
             remoteFile.unlockFile( repositoryName );
             remoteFile.disconnect();

             if ( null != downloadedRepositoryXml )
             {
                 downloadedRepositoryXml.delete();
             }
         }
     }

     private static final Pattern ALT_REPO_SYNTAX_PATTERN = Pattern.compile( "(.+)::(.+)::(.+)" );


     private void openRepositoryConnection( RemoteFileManager remoteFile ) throws MojoExecutionException
     {
         // use OBR specific deployment location?
         if ( obrDeploymentRepository != null )
         {
             altDeploymentRepository = obrDeploymentRepository;
         }

         if ( deploymentRepository == null && altDeploymentRepository == null )
         {
             String msg = "Deployment failed: repository element was not specified in the pom inside"
                 + " distributionManagement element or in -DaltDeploymentRepository=id::layout::url parameter";

             throw new MojoExecutionException( msg );
         }

         if ( altDeploymentRepository != null )
         {
             getLog().info( "Using alternate deployment repository " + altDeploymentRepository );

             Matcher matcher = ALT_REPO_SYNTAX_PATTERN.matcher( altDeploymentRepository );
             if ( !matcher.matches() )
             {
                 throw new MojoExecutionException( "Invalid syntax for alternative repository \""
                     + altDeploymentRepository + "\". Use \"id::layout::url\"." );
             }

             remoteFile.connect( matcher.group( 1 ).trim(), matcher.group( 3 ).trim() );
         }
         else
         {
             remoteFile.connect( deploymentRepository.getId(), deploymentRepository.getUrl() );
         }
     }


     /**
      * Analyze the given XML tree (DOM of the repository file) and remove missing resources.
      * This method ask the user before deleting the resources from the repository.
      * @param elem : the input XML tree
      * @return the cleaned XML tree
      */
     private Element cleanDocument( Element elem )
     {
         NodeList nodes = elem.getElementsByTagName( "resource" );
         List toRemove = new ArrayList();

         // First, look for missing resources
         for ( int i = 0; i < nodes.getLength(); i++ )
         {
             Element n = ( Element ) nodes.item( i );
             String value = n.getAttribute( "uri" );

             URL url;
             try
             {
                 url = new URL( new URL( prefixUrl + '/' ), value );
             }
             catch ( MalformedURLException e )
             {
                 getLog().error( "Malformed URL when creating the resource absolute URI : " + e.getMessage() );
                 return null;
             }

             try
             {
                 url.openConnection().getContent();
             }
             catch ( IOException e )
             {
                 getLog().info(
                     "The bundle " + n.getAttribute( "presentationname" ) + " - " + n.getAttribute( "version" )
                         + " will be removed : " + e.getMessage() );
                 toRemove.add( n );
             }
         }

         Date d = new Date();
         if ( toRemove.size() > 0 )
         {
             String answer = "y";
             if ( interactive )
             {
                 System.out.println( "Do you want to remove these bundles from the repository file [y/N]:" );
                 BufferedReader br = new BufferedReader( new InputStreamReader( System.in ) );

                 try
                 {
                     answer = br.readLine();
                 }
                 catch ( IOException ioe )
                 {
                     getLog().error( "IO error trying to read the user confirmation" );
                     return null;
                 }
             }

             if ( answer != null && answer.trim().equalsIgnoreCase( "y" ) )
             {
                 // Then remove missing resources.
                 for ( int i = 0; i < toRemove.size(); i++ )
                 {
                     elem.removeChild( ( Node ) toRemove.get( i ) );
                 }

                 // If we have to remove resources, we need to update 'lastmodified' attribute
                 SimpleDateFormat format = new SimpleDateFormat( "yyyyMMddHHmmss.SSS" );
                 d.setTime( System.currentTimeMillis() );
                 elem.setAttribute( "lastmodified", format.format( d ) );
                 return elem;
             }
             else
             {
                 return null;
             }
         }

         return null;
     }


     /**
      * Initialize the document builder from Xerces.
      *
      * @return DocumentBuilder ready to create new document
      * @throws MojoExecutionException : occurs when the instantiation of the document builder fails
      */
     private DocumentBuilder initConstructor() throws MojoExecutionException
     {
         DocumentBuilder constructor = null;
         DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
         try
         {
             constructor = factory.newDocumentBuilder();
         }
         catch ( ParserConfigurationException e )
         {
             getLog().error( "Unable to create a new xml document" );
             throw new MojoExecutionException( "Cannot create the Document Builder : " + e.getMessage() );
         }
         return constructor;
     }


     /**
      * Open an XML file.
      *
      * @param file : XML file
      * @param constructor DocumentBuilder get from xerces
      * @return Document which describes this file
      * @throws MojoExecutionException occurs when the given file cannot be opened or is a valid XML file.
      */
     private Document parseFile( File file, DocumentBuilder constructor ) throws MojoExecutionException
     {
         if ( constructor == null )
         {
             return null;
         }
         // The document is the root of the DOM tree.
         File targetFile = file.getAbsoluteFile();
         getLog().info( "Parsing " + targetFile );
         Document doc = null;
         try
         {
             doc = constructor.parse( targetFile );
         }
         catch ( SAXException e )
         {
             getLog().error( "Cannot parse " + targetFile + " : " + e.getMessage() );
             throw new MojoExecutionException( "Cannot parse " + targetFile + " : " + e.getMessage() );
         }
         catch ( IOException e )
         {
             getLog().error( "Cannot open " + targetFile + " : " + e.getMessage() );
             throw new MojoExecutionException( "Cannot open " + targetFile + " : " + e.getMessage() );
         }
         return doc;
     }


     /**
      * write a Node in a xml file.
      *
      * @param outputFilename URI to the output file
      * @param treeToBeWrite Node root of the tree to be write in file
      * @throws MojoExecutionException if the plugin failed
      */
     private void writeToFile( URI outputFilename, Node treeToBeWrite ) throws MojoExecutionException
     {
         // init the transformer
         Transformer transformer = null;
         TransformerFactory tfabrique = TransformerFactory.newInstance();
         try
         {
             transformer = tfabrique.newTransformer();
         }
         catch ( TransformerConfigurationException e )
         {
             getLog().error( "Unable to write to file: " + outputFilename.toString() );
             throw new MojoExecutionException( "Unable to write to file: " + outputFilename.toString() + " : "
                 + e.getMessage() );
         }
         Properties proprietes = new Properties();
         proprietes.put( "method", "xml" );
         proprietes.put( "version", "1.0" );
         proprietes.put( "encoding", "ISO-8859-1" );
         proprietes.put( "standalone", "yes" );
         proprietes.put( "indent", "yes" );
         proprietes.put( "omit-xml-declaration", "no" );
         transformer.setOutputProperties( proprietes );

         DOMSource input = new DOMSource( treeToBeWrite );

         File fichier = new File( outputFilename );
         FileOutputStream flux = null;
         try
         {
             flux = new FileOutputStream( fichier );
         }
         catch ( FileNotFoundException e )
         {
             getLog().error( "Unable to write to file: " + fichier.getName() );
             throw new MojoExecutionException( "Unable to write to file: " + fichier.getName() + " : " + e.getMessage() );
         }
         Result output = new StreamResult( flux );
         try
         {
             transformer.transform( input, output );
         }
         catch ( TransformerException e )
         {
             throw new MojoExecutionException( "Unable to write to file: " + outputFilename.toString() + " : "
                 + e.getMessage() );
         }

         try
         {
             flux.flush();
             flux.close();
         }
         catch ( IOException e )
         {
             throw new MojoExecutionException( "IOException when closing file : " + e.getMessage() );
         }
     }
 }
	/*
	* 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.felix.obrplugin;


	import java.io.BufferedReader;
	import java.io.File;
	import java.io.FileNotFoundException;
	import java.io.FileOutputStream;
	import java.io.IOException;
	import java.io.InputStreamReader;
	import java.net.MalformedURLException;
	import java.net.URI;
	import java.net.URL;
	import java.text.SimpleDateFormat;
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.Date;
	import java.util.List;
	import java.util.Properties;
	import java.util.regex.Matcher;
	import java.util.regex.Pattern;

	import javax.xml.parsers.DocumentBuilder;
	import javax.xml.parsers.DocumentBuilderFactory;
	import javax.xml.parsers.ParserConfigurationException;
	import javax.xml.transform.Result;
	import javax.xml.transform.Transformer;
	import javax.xml.transform.TransformerConfigurationException;
	import javax.xml.transform.TransformerException;
	import javax.xml.transform.TransformerFactory;
	import javax.xml.transform.dom.DOMSource;
	import javax.xml.transform.stream.StreamResult;

	import org.apache.maven.artifact.manager.WagonManager;
	import org.apache.maven.artifact.repository.ArtifactRepository;
	import org.apache.maven.plugin.AbstractMojo;
	import org.apache.maven.plugin.MojoExecutionException;
	import org.apache.maven.plugin.logging.Log;
	import org.apache.maven.plugins.annotations.Component;
	import org.apache.maven.plugins.annotations.LifecyclePhase;
	import org.apache.maven.plugins.annotations.Mojo;
	import org.apache.maven.plugins.annotations.Parameter;
	import org.apache.maven.project.MavenProject;
	import org.apache.maven.settings.Settings;
	import org.w3c.dom.Document;
	import org.w3c.dom.Element;
	import org.w3c.dom.Node;
	import org.w3c.dom.NodeList;
	import org.xml.sax.SAXException;


	/**
	* Clean a remote repository file.
	* It just looks for every resources and check that pointed file exists.
	*
	* @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a>
	*/
	@Mojo( name = "remote-clean", requiresProject = false, defaultPhase = LifecyclePhase.CLEAN )
	public final class ObrRemoteClean extends AbstractMojo
	{
	/**
	* When true, ignore remote locking.
	*/
	@Parameter( property = "ignoreLock" )
	private boolean ignoreLock;

	/**
	* Optional public URL prefix for the remote repository.
	*/
	@Parameter( property = "prefixUrl" )
	private String prefixUrl;

	/**
	* Remote OBR Repository.
	*/
	@Parameter( property = "remoteOBR", defaultValue = "NONE" )
	private String remoteOBR;

	/**
	* Local OBR Repository.
	*/
	@Parameter( property = "obrRepository" )
	private String obrRepository;

	/**
	* Project types which this plugin supports.
	*/
	@Parameter
	private List supportedProjectTypes = Arrays.asList( new String[]
	{ "jar", "bundle" } );

	@Parameter( defaultValue = "${project.distributionManagementArtifactRepository}", readonly = true )
	private ArtifactRepository deploymentRepository;

	/**
	* Alternative deployment repository. Format: id::layout::url
	*/
	@Parameter( property = "altDeploymentRepository" )
	private String altDeploymentRepository;

	/**
	* OBR specific deployment repository. Format: id::layout::url
	*/
	@Parameter( property = "obrDeploymentRepository" )
	private String obrDeploymentRepository;

	@Parameter( defaultValue = "${settings.interactiveMode}", readonly = true )
	private boolean interactive;

	/**
	* The Maven project.
	*/
	@Parameter( defaultValue = "${project}", readonly = true, required = true )
	private MavenProject project;

	/**
	* Local Maven settings.
	*/
	@Parameter( defaultValue = "${settings}", readonly = true, required = true )
	private Settings settings;

	/**
	* The Wagon manager.
	*/
	@Component
	private WagonManager m_wagonManager;


	public void execute() throws MojoExecutionException
	{
	String projectType = project.getPackaging();

	// ignore unsupported project types, useful when bundleplugin is configured in parent pom
	if ( !supportedProjectTypes.contains( projectType ) )
	{
	getLog().warn(
	"Ignoring project type " + projectType + " - supportedProjectTypes = " + supportedProjectTypes );
	return;
	}
	else if ( "NONE".equalsIgnoreCase( remoteOBR ) \|\| "false".equalsIgnoreCase( remoteOBR ) )
	{
	getLog().info( "Remote OBR update disabled (enable with -DremoteOBR)" );
	return;
	}

	// if the user doesn't supply an explicit name for the remote OBR file, use the local name instead
	if ( null == remoteOBR \|\| remoteOBR.trim().length() == 0 \|\| "true".equalsIgnoreCase( remoteOBR ) )
	{
	remoteOBR = obrRepository;
	}

	URI tempURI = ObrUtils.findRepositoryXml( "", remoteOBR );
	String repositoryName = new File( tempURI.getSchemeSpecificPart() ).getName();

	Log log = getLog();

	RemoteFileManager remoteFile = new RemoteFileManager( m_wagonManager, settings, log );
	openRepositoryConnection( remoteFile );
	if ( null == prefixUrl )
	{
	prefixUrl = remoteFile.toString();
	}

	// ======== LOCK REMOTE OBR ========
	log.info( "LOCK " + remoteFile + '/' + repositoryName );
	remoteFile.lockFile( repositoryName, ignoreLock );
	File downloadedRepositoryXml = null;

	try
	{
	// ======== DOWNLOAD REMOTE OBR ========
	log.info( "Downloading " + repositoryName );
	downloadedRepositoryXml = remoteFile.get( repositoryName, ".xml" );

	URI repositoryXml = downloadedRepositoryXml.toURI();

	Config userConfig = new Config();
	userConfig.setRemoteFile( true );

	// Clean the downloaded file.
	Document doc = parseFile( new File( repositoryXml ), initConstructor() );
	Node finalDocument = cleanDocument( doc.getDocumentElement() );

	if ( finalDocument == null )
	{
	getLog().info( "Nothing to clean in " + repositoryName );
	}
	else
	{
	writeToFile( repositoryXml, finalDocument ); // Write the new file
	getLog().info( "Repository " + repositoryName + " cleaned" );
	// ======== UPLOAD MODIFIED OBR ========
	log.info( "Uploading " + repositoryName );
	remoteFile.put( downloadedRepositoryXml, repositoryName );
	}
	}
	catch ( Exception e )
	{
	log.warn( "Exception while updating remote OBR: " + e.getLocalizedMessage(), e );
	}
	finally
	{
	// ======== UNLOCK REMOTE OBR ========
	log.info( "UNLOCK " + remoteFile + '/' + repositoryName );
	remoteFile.unlockFile( repositoryName );
	remoteFile.disconnect();

	if ( null != downloadedRepositoryXml )
	{
	downloadedRepositoryXml.delete();
	}
	}
	}

	private static final Pattern ALT_REPO_SYNTAX_PATTERN = Pattern.compile( "(.+)::(.+)::(.+)" );


	private void openRepositoryConnection( RemoteFileManager remoteFile ) throws MojoExecutionException
	{
	// use OBR specific deployment location?
	if ( obrDeploymentRepository != null )
	{
	altDeploymentRepository = obrDeploymentRepository;
	}

	if ( deploymentRepository == null && altDeploymentRepository == null )
	{
	String msg = "Deployment failed: repository element was not specified in the pom inside"
	+ " distributionManagement element or in -DaltDeploymentRepository=id::layout::url parameter";

	throw new MojoExecutionException( msg );
	}

	if ( altDeploymentRepository != null )
	{
	getLog().info( "Using alternate deployment repository " + altDeploymentRepository );

	Matcher matcher = ALT_REPO_SYNTAX_PATTERN.matcher( altDeploymentRepository );
	if ( !matcher.matches() )
	{
	throw new MojoExecutionException( "Invalid syntax for alternative repository \""
	+ altDeploymentRepository + "\". Use \"id::layout::url\"." );
	}

	remoteFile.connect( matcher.group( 1 ).trim(), matcher.group( 3 ).trim() );
	}
	else
	{
	remoteFile.connect( deploymentRepository.getId(), deploymentRepository.getUrl() );
	}
	}


	/**
	* Analyze the given XML tree (DOM of the repository file) and remove missing resources.
	* This method ask the user before deleting the resources from the repository.
	* @param elem : the input XML tree
	* @return the cleaned XML tree
	*/
	private Element cleanDocument( Element elem )
	{
	NodeList nodes = elem.getElementsByTagName( "resource" );
	List toRemove = new ArrayList();

	// First, look for missing resources
	for ( int i = 0; i < nodes.getLength(); i++ )
	{
	Element n = ( Element ) nodes.item( i );
	String value = n.getAttribute( "uri" );

	URL url;
	try
	{
	url = new URL( new URL( prefixUrl + '/' ), value );
	}
	catch ( MalformedURLException e )
	{
	getLog().error( "Malformed URL when creating the resource absolute URI : " + e.getMessage() );
	return null;
	}

	try
	{
	url.openConnection().getContent();
	}
	catch ( IOException e )
	{
	getLog().info(
	"The bundle " + n.getAttribute( "presentationname" ) + " - " + n.getAttribute( "version" )
	+ " will be removed : " + e.getMessage() );
	toRemove.add( n );
	}
	}

	Date d = new Date();
	if ( toRemove.size() > 0 )
	{
	String answer = "y";
	if ( interactive )
	{
	System.out.println( "Do you want to remove these bundles from the repository file [y/N]:" );
	BufferedReader br = new BufferedReader( new InputStreamReader( System.in ) );

	try
	{
	answer = br.readLine();
	}
	catch ( IOException ioe )
	{
	getLog().error( "IO error trying to read the user confirmation" );
	return null;
	}
	}

	if ( answer != null && answer.trim().equalsIgnoreCase( "y" ) )
	{
	// Then remove missing resources.
	for ( int i = 0; i < toRemove.size(); i++ )
	{
	elem.removeChild( ( Node ) toRemove.get( i ) );
	}

	// If we have to remove resources, we need to update 'lastmodified' attribute
	SimpleDateFormat format = new SimpleDateFormat( "yyyyMMddHHmmss.SSS" );
	d.setTime( System.currentTimeMillis() );
	elem.setAttribute( "lastmodified", format.format( d ) );
	return elem;
	}
	else
	{
	return null;
	}
	}

	return null;
	}


	/**
	* Initialize the document builder from Xerces.
	*
	* @return DocumentBuilder ready to create new document
	* @throws MojoExecutionException : occurs when the instantiation of the document builder fails
	*/
	private DocumentBuilder initConstructor() throws MojoExecutionException
	{
	DocumentBuilder constructor = null;
	DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
	try
	{
	constructor = factory.newDocumentBuilder();
	}
	catch ( ParserConfigurationException e )
	{
	getLog().error( "Unable to create a new xml document" );
	throw new MojoExecutionException( "Cannot create the Document Builder : " + e.getMessage() );
	}
	return constructor;
	}


	/**
	* Open an XML file.
	*
	* @param file : XML file
	* @param constructor DocumentBuilder get from xerces
	* @return Document which describes this file
	* @throws MojoExecutionException occurs when the given file cannot be opened or is a valid XML file.
	*/
	private Document parseFile( File file, DocumentBuilder constructor ) throws MojoExecutionException
	{
	if ( constructor == null )
	{
	return null;
	}
	// The document is the root of the DOM tree.
	File targetFile = file.getAbsoluteFile();
	getLog().info( "Parsing " + targetFile );
	Document doc = null;
	try
	{
	doc = constructor.parse( targetFile );
	}
	catch ( SAXException e )
	{
	getLog().error( "Cannot parse " + targetFile + " : " + e.getMessage() );
	throw new MojoExecutionException( "Cannot parse " + targetFile + " : " + e.getMessage() );
	}
	catch ( IOException e )
	{
	getLog().error( "Cannot open " + targetFile + " : " + e.getMessage() );
	throw new MojoExecutionException( "Cannot open " + targetFile + " : " + e.getMessage() );
	}
	return doc;
	}


	/**
	* write a Node in a xml file.
	*
	* @param outputFilename URI to the output file
	* @param treeToBeWrite Node root of the tree to be write in file
	* @throws MojoExecutionException if the plugin failed
	*/
	private void writeToFile( URI outputFilename, Node treeToBeWrite ) throws MojoExecutionException
	{
	// init the transformer
	Transformer transformer = null;
	TransformerFactory tfabrique = TransformerFactory.newInstance();
	try
	{
	transformer = tfabrique.newTransformer();
	}
	catch ( TransformerConfigurationException e )
	{
	getLog().error( "Unable to write to file: " + outputFilename.toString() );
	throw new MojoExecutionException( "Unable to write to file: " + outputFilename.toString() + " : "
	+ e.getMessage() );
	}
	Properties proprietes = new Properties();
	proprietes.put( "method", "xml" );
	proprietes.put( "version", "1.0" );
	proprietes.put( "encoding", "ISO-8859-1" );
	proprietes.put( "standalone", "yes" );
	proprietes.put( "indent", "yes" );
	proprietes.put( "omit-xml-declaration", "no" );
	transformer.setOutputProperties( proprietes );

	DOMSource input = new DOMSource( treeToBeWrite );

	File fichier = new File( outputFilename );
	FileOutputStream flux = null;
	try
	{
	flux = new FileOutputStream( fichier );
	}
	catch ( FileNotFoundException e )
	{
	getLog().error( "Unable to write to file: " + fichier.getName() );
	throw new MojoExecutionException( "Unable to write to file: " + fichier.getName() + " : " + e.getMessage() );
	}
	Result output = new StreamResult( flux );
	try
	{
	transformer.transform( input, output );
	}
	catch ( TransformerException e )
	{
	throw new MojoExecutionException( "Unable to write to file: " + outputFilename.toString() + " : "
	+ e.getMessage() );
	}

	try
	{
	flux.flush();
	flux.close();
	}
	catch ( IOException e )
	{
	throw new MojoExecutionException( "IOException when closing file : " + e.getMessage() );
	}
	}
	}