package org.apache.maven.plugin.dependency;
   
   /*
    * 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.BufferedReader;
  import java.io.BufferedWriter;
  import java.io.File;
  import java.io.FileReader;
  import java.io.FileWriter;
  import java.io.IOException;
  import java.io.Writer;
  import java.util.ArrayList;
  import java.util.Comparator;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Set;
  
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.dependency.utils.DependencyUtil;
  import org.apache.maven.project.MavenProjectHelper;
  import org.apache.maven.shared.artifact.filter.collection.ArtifactsFilter;
  import org.codehaus.plexus.util.StringUtils;
  
  /**
   * This goal will output a classpath string of dependencies from the local repository to a file or log.
   * 
   * @goal build-classpath
   * @requiresDependencyResolution test
   * @phase generate-sources
   * @author ankostis
   * @version $Id: BuildClasspathMojo.java 728546 2008-12-21 22:56:51Z bentmann $
   * @since 2.0-alpha-2
   */
  public class BuildClasspathMojo
      extends AbstractDependencyFilterMojo
      implements Comparator
  {
  
      /**
       * Strip artifact version during copy (only works if prefix is set)
       * 
       * @parameter expression="${mdep.stripVersion}" default-value="false"
       * @parameter
       */
      private boolean stripVersion = false;
  
      /**
       * The prefix to prepend on each dependent artifact. If undefined, the paths refer to the actual files store in the
       * local repository (the stipVersion parameter does nothing then).
       * 
       * @parameter expression="${mdep.prefix}"
       */
      private String prefix;
  
      /**
       * The file to write the classpath string. If undefined, it just prints the classpath as [INFO].
       * This parameter is deprecated. Use outputFile instead.
       * @parameter expression="${mdep.cpFile}"
       * @deprecated use outputFile instead
       * @since 2.0
       */
      private File cpFile;
  
      /**
       * The file to write the classpath string. If undefined, it just prints the classpath as [INFO].
       * @parameter expression="${mdep.outputFile}"
       */
      private File outputFile;
      
      /**
       * If 'true', it skips the up-to-date-check, and always regenerates the classpath file.
       * 
       * @parameter default-value="false" expression="${mdep.regenerateFile}"
       */
      private boolean regenerateFile;
  
      /**
       * Override the char used between the paths. This field is initialized to contain the first character of the value
       * of the system property file.separator. On UNIX systems the value of this field is '/'; on Microsoft Windows
       * systems it is '\'. The default is File.separator
       * 
      * @since 2.0
      * @parameter default-value="" expression="${mdep.fileSeparator}"
      */
     private String fileSeparator;
 
     /**
      * Override the char used between path folders. The system-dependent path-separator character. This field is
      * initialized to contain the first character of the value of the system property path.separator. This character is
      * used to separate filenames in a sequence of files given as a path list. On UNIX systems, this character is ':';
      * on Microsoft Windows systems it is ';'.
      * 
      * @since 2.0
      * @parameter default-value="" expression="${mdep.pathSeparator}"
      */
     private String pathSeparator;
 
     /**
      * Replace the absolute path to the local repo with this property. This field is ignored it prefix is declared. The
      * value will be forced to "${M2_REPO}" if no value is provided AND the attach flag is true.
      * 
      * @since 2.0
      * @parameter default-value="" expression="${mdep.localRepoProperty}"
      */
     private String localRepoProperty;
 
     /**
      * Attach the classpath file to the main artifact so it can be installed and deployed.
      * 
      * @since 2.0
      * @parameter default-value=false
      */
     boolean attach;
     
     /**
      * Write out the classpath in a format compatible with filtering (classpath=xxxxx)
      * 
      * @since 2.0
      * @parameter default-value=false expression="${mdep.outputFilterFile}"
      */
     boolean outputFilterFile;
 
     /**
      * Maven ProjectHelper
      * 
      * @component
      * @readonly
      */
     private MavenProjectHelper projectHelper;
 
     boolean isFileSepSet = true;
 
     boolean isPathSepSet = true;
 
     /**
      * Main entry into mojo. Gets the list of dependencies and iterates through calling copyArtifact.
      * 
      * @throws MojoExecutionException with a message if an error occurs.
      * @see #getDependencies
      * @see #copyArtifact(Artifact, boolean)
      */
     public void execute()
         throws MojoExecutionException
     {
         
         if (cpFile != null)
         {
             getLog().warn( "The parameter cpFile is deprecated. Use outputFile instead." );
             this.outputFile = cpFile;
         }
         
         // initialize the separators.
         if ( StringUtils.isEmpty( fileSeparator ) )
         {
             isFileSepSet = false;
         }
         else
         {
             isFileSepSet = true;
         }
 
         if ( StringUtils.isEmpty( pathSeparator ) )
         {
             isPathSepSet = false;
         }
         else
         {
             isPathSepSet = true;
         }
 
         //don't allow them to have absolute paths when they attach.
         if ( attach && StringUtils.isEmpty( localRepoProperty ) )
         {
             localRepoProperty = "${M2_REPO}";
         }
 
         Set artifacts = getResolvedDependencies( true );
 
         if ( artifacts == null || artifacts.isEmpty() )
         {
             getLog().info( "No dependencies found." );
         }
 
         List artList = new ArrayList( artifacts );
 
         StringBuffer sb = new StringBuffer();
         Iterator i = artList.iterator();
 
         if ( i.hasNext() )
         {
             appendArtifactPath( (Artifact) i.next(), sb );
 
             while ( i.hasNext() )
             {
                 sb.append( isPathSepSet ? this.pathSeparator : File.pathSeparator );
                 appendArtifactPath( (Artifact) i.next(), sb );
             }
         }
 
         String cpString = sb.toString();
 
         // if file separator is set, I need to replace the default one from all
         // the file paths that were pulled from the artifacts
         if ( isFileSepSet )
         {
             String separator = File.separator;
 
             // if the file sep is "\" then I need to escape it for the regex
             if ( File.separator.equals( "\\" ) )
             {
                 separator = "\\\\";
             }
 
             cpString = cpString.replaceAll( separator, fileSeparator );
         }
 
         //make the string valid for filtering
         if (outputFilterFile)
         {
             cpString = "classpath="+ cpString;
         }
         
         if ( outputFile == null )
         {
             getLog().info( "Dependencies classpath:\n" + cpString );
         }
         else
         {
             if ( regenerateFile || !isUpdToDate( cpString ) )
             {
                 storeClasspathFile( cpString, outputFile );
             }
             else
             {
                 this.getLog().info( "Skipped writing classpath file '" + outputFile + "'.  No changes found." );
             }
         }
         if ( attach )
         {
             attachFile( cpString );
         }
     }
 
     protected void attachFile( String cpString )
         throws MojoExecutionException
     {
         File attachedFile = new File( project.getBuild().getDirectory(), "classpath" );
         storeClasspathFile( cpString, attachedFile );
 
         projectHelper.attachArtifact( project, attachedFile, "classpath" );
     }
 
     /**
      * Appends the artifact path into the specified stringBuffer.
      * 
      * @param art
      * @param sb
      */
     protected void appendArtifactPath( Artifact art, StringBuffer sb )
     {
         if ( prefix == null )
         {
             String file = art.getFile().getPath();
             // substitute the property for the local repo path to make the classpath file portable.
             if ( StringUtils.isNotEmpty( localRepoProperty ) )
             {
                 file = StringUtils.replace( file, local.getBasedir(), localRepoProperty );
             }
             sb.append( file );
         }
         else
         {
             // TODO: add param for prepending groupId and version.
             sb.append( prefix );
             sb.append( File.separator );
             sb.append( DependencyUtil.getFormattedFileName( art, this.stripVersion ) );
         }
     }
 
     /**
      * Checks that new classpath differs from that found inside the old classpathFile.
      * 
      * @param cpString
      * @return true if the specified classpath equals to that found inside the file, false otherwise (including when
      *         file does not exists but new classpath does).
      */
     private boolean isUpdToDate( String cpString )
     {
         try
         {
             String oldCp = readClasspathFile();
             return ( cpString == oldCp || ( cpString != null && cpString.equals( oldCp ) ) );
         }
         catch ( Exception ex )
         {
             this.getLog().warn( "Error while reading old classpath file '" + outputFile + "' for up-to-date check: " + ex );
 
             return false;
         }
     }
 
     /**
      * It stores the specified string into that file.
      * 
      * @param cpString the string to be written into the file.
      * @throws MojoExecutionException
      */
     private void storeClasspathFile( String cpString, File out )
         throws MojoExecutionException
     {
         
         //make sure the parent path exists.
         out.getParentFile().mkdirs();
         
         try
         {
            
             
             Writer w = new BufferedWriter( new FileWriter( out ) );
 
             try
             {
                 w.write( cpString );
 
                 getLog().info( "Wrote classpath file '" + out + "'." );
             }
             catch ( IOException ex )
             {
                 throw new MojoExecutionException( "Error while writting to classpath file '" + out + "': " +
                     ex.toString(), ex );
             }
             finally
             {
                 w.close();
             }
         }
         catch ( IOException ex )
         {
             throw new MojoExecutionException( "Error while opening/closing classpath file '" + out + "': " +
                 ex.toString(), ex );
         }
     }
 
     /**
      * Reads into a string the file specified by the mojo param 'outputFile'. Assumes, the instance variable 'outputFile' is not
      * null.
      * 
      * @return the string contained in the classpathFile, if exists, or null ortherwise.
      * @throws MojoExecutionException
      */
     protected String readClasspathFile()
         throws IOException
     {
         if ( outputFile == null )
         {
             throw new IllegalArgumentException(
                                                 "The outputFile parameter cannot be null if the file is intended to be read." );
         }
 
         if ( !outputFile.isFile() )
         {
             return null;
         }
         StringBuffer sb = new StringBuffer();
         BufferedReader r = new BufferedReader( new FileReader( outputFile ) );
 
         try
         {
             String l;
             while ( ( l = r.readLine() ) != null )
             {
                 sb.append( l );
             }
 
             return sb.toString();
         }
         finally
         {
             r.close();
         }
     }
 
     /**
      * Compares artifacts lexicographically, using pattern [group_id][artifact_id][version].
      * 
      * @param arg1 first object
      * @param arg2 second object
      * @return the value <code>0</code> if the argument string is equal to this string; a value less than
      *         <code>0</code> if this string is lexicographically less than the string argument; and a value greater
      *         than <code>0</code> if this string is lexicographically greater than the string argument.
      */
     public int compare( Object arg1, Object arg2 )
     {
         if ( arg1 instanceof Artifact && arg2 instanceof Artifact )
         {
             if ( arg1 == arg2 )
             {
                 return 0;
             }
             else if ( arg1 == null )
             {
                 return -1;
             }
             else if ( arg2 == null )
             {
                 return +1;
             }
 
             Artifact art1 = (Artifact) arg1;
             Artifact art2 = (Artifact) arg2;
 
             String s1 = art1.getGroupId() + art1.getArtifactId() + art1.getVersion();
             String s2 = art2.getGroupId() + art2.getArtifactId() + art2.getVersion();
 
             return s1.compareTo( s2 );
         }
         else
         {
             return 0;
         }
     }
 
     protected ArtifactsFilter getMarkedArtifactFilter()
     {
         return null;
     }
 
     /**
      * @return the outputFile
      */
     public File getCpFile()
     {
         return this.outputFile;
     }
 
     /**
      * @param theCpFile the outputFile to set
      */
     public void setCpFile( File theCpFile )
     {
         this.outputFile = theCpFile;
     }
 
     /**
      * @return the fileSeparator
      */
     public String getFileSeparator()
     {
         return this.fileSeparator;
     }
 
     /**
      * @param theFileSeparator the fileSeparator to set
      */
     public void setFileSeparator( String theFileSeparator )
     {
         this.fileSeparator = theFileSeparator;
     }
 
     /**
      * @return the pathSeparator
      */
     public String getPathSeparator()
     {
         return this.pathSeparator;
     }
 
     /**
      * @param thePathSeparator the pathSeparator to set
      */
     public void setPathSeparator( String thePathSeparator )
     {
         this.pathSeparator = thePathSeparator;
     }
 
     /**
      * @return the prefix
      */
     public String getPrefix()
     {
         return this.prefix;
     }
 
     /**
      * @param thePrefix the prefix to set
      */
     public void setPrefix( String thePrefix )
     {
         this.prefix = thePrefix;
     }
 
     /**
      * @return the regenerateFile
      */
     public boolean isRegenerateFile()
     {
         return this.regenerateFile;
     }
 
     /**
      * @param theRegenerateFile the regenerateFile to set
      */
     public void setRegenerateFile( boolean theRegenerateFile )
     {
         this.regenerateFile = theRegenerateFile;
     }
 
     /**
      * @return the stripVersion
      */
     public boolean isStripVersion()
     {
         return this.stripVersion;
     }
 
     /**
      * @param theStripVersion the stripVersion to set
      */
     public void setStripVersion( boolean theStripVersion )
     {
         this.stripVersion = theStripVersion;
     }
 
     public String getLocalRepoProperty()
     {
         return localRepoProperty;
     }
 
     public void setLocalRepoProperty( String localRepoProperty )
     {
         this.localRepoProperty = localRepoProperty;
     }
 
     public boolean isFileSepSet()
     {
         return isFileSepSet;
     }
 
     public void setFileSepSet( boolean isFileSepSet )
     {
         this.isFileSepSet = isFileSepSet;
     }
 
     public boolean isPathSepSet()
     {
         return isPathSepSet;
     }
 
     public void setPathSepSet( boolean isPathSepSet )
     {
         this.isPathSepSet = isPathSepSet;
     }
 }