package org.apache.maven.plugins.pmd;
   
   /*
    * 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.util.ArrayList;
  import java.util.List;
  
  import org.apache.maven.plugin.AbstractMojo;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.MojoFailureException;
  import org.apache.maven.plugins.annotations.Parameter;
  import org.apache.maven.project.MavenProject;
  import org.codehaus.plexus.util.xml.pull.XmlPullParserException;
  
  /**
   * Base class for mojos that check if there were any PMD violations.
   *
   * @param <D> type of the check, e.g. {@link org.apache.maven.plugins.pmd.model.Violation}
   * or {@link org.apache.maven.plugins.pmd.model.Duplication}.
   * @author <a href="mailto:brett@apache.org">Brett Porter</a>
   * @version $Id$
   */
  public abstract class AbstractPmdViolationCheckMojo<D>
      extends AbstractMojo
  {
      /**
       * The location of the XML report to check, as generated by the PMD report.
       */
      @Parameter( property = "project.build.directory", required = true )
      private File targetDirectory;
  
      /**
       * Whether to fail the build if the validation check fails.
       */
      @Parameter( property = "pmd.failOnViolation", defaultValue = "true", required = true )
      protected boolean failOnViolation;
  
      /**
       * Whether to build an aggregated report at the root, or build individual reports.
       *
       * @since 2.2
       */
      @Parameter( property = "aggregate", defaultValue = "false" )
      protected boolean aggregate;
  
      /**
       * Print details of check failures to build output.
       */
      @Parameter( property = "pmd.verbose", defaultValue = "false" )
      private boolean verbose;
  
      /**
       * Print details of errors that cause build failure
       *
       * @since 3.0
       */
      @Parameter( property = "pmd.printFailingErrors", defaultValue = "false" )
      private boolean printFailingErrors;
  
      /**
       * File that lists classes and rules to be excluded from failures.
       * For PMD, this is a properties file. For CPD, this
       * is a text file that contains comma-separated lists of classes
       * that are allowed to duplicate.
       *
       * @since 3.0
       */
      @Parameter( property = "pmd.excludeFromFailureFile", defaultValue = "" )
      private String excludeFromFailureFile;
  
      /** Helper to exclude violations from the result. */
      private final ExcludeFromFile<D> excludeFromFile;
  
      /**
       * Initialize this abstact check mojo by giving the correct ExcludeFromFile helper.
       * @param excludeFromFile the needed helper, for the specific violation type
       */
      protected AbstractPmdViolationCheckMojo( ExcludeFromFile<D> excludeFromFile )
      {
          this.excludeFromFile = excludeFromFile;
     }
 
     /**
      * The project to analyze.
      */
     @Parameter( defaultValue = "${project}", readonly = true, required = true )
     protected MavenProject project;
 
     protected void executeCheck( final String filename, final String tagName, final String key,
                                  final int failurePriority )
         throws MojoFailureException, MojoExecutionException
     {
         if ( aggregate && !project.isExecutionRoot() )
         {
             return;
         }
 
         if ( "pom".equals( project.getPackaging() ) && !aggregate )
         {
             return;
         }
 
         excludeFromFile.loadExcludeFromFailuresData( excludeFromFailureFile );
         final File outputFile = new File( targetDirectory, filename );
 
         if ( outputFile.exists() )
         {
             try
             {
                 final ViolationDetails<D> violations = getViolations( outputFile, failurePriority );
 
                 final List<D> failures = violations.getFailureDetails();
                 final List<D> warnings = violations.getWarningDetails();
 
                 if ( verbose )
                 {
                     printErrors( failures, warnings );
                 }
 
                 final int failureCount = failures.size();
                 final int warningCount = warnings.size();
 
                 final String message = getMessage( failureCount, warningCount, key, outputFile );
 
                 getLog().debug( "PMD failureCount: " + failureCount + ", warningCount: " + warningCount );
 
                 if ( failureCount > 0 && isFailOnViolation() )
                 {
                     throw new MojoFailureException( message );
                 }
 
                 this.getLog().info( message );
             }
             catch ( final IOException e )
             {
                 throw new MojoExecutionException(
                                                   "Unable to read PMD results xml: " + outputFile.getAbsolutePath(),
                                                   e );
             }
             catch ( final XmlPullParserException e )
             {
                 throw new MojoExecutionException(
                                                   "Unable to read PMD results xml: " + outputFile.getAbsolutePath(),
                                                   e );
             }
         }
         else
         {
             throw new MojoFailureException( "Unable to perform check, " + "unable to find " + outputFile );
         }
     }
 
     /**
      * Method for collecting the violations found by the PMD tool
      *
      * @param analysisFile
      * @param failurePriority
      * @return an int that specifies the number of violations found
      * @throws XmlPullParserException
      * @throws IOException
      */
     private ViolationDetails<D> getViolations( final File analysisFile, final int failurePriority )
         throws XmlPullParserException, IOException
     {
         final List<D> failures = new ArrayList<>();
         final List<D> warnings = new ArrayList<>();
 
         final List<D> violations = getErrorDetails( analysisFile );
 
         for ( final D violation : violations )
         {
             final int priority = getPriority( violation );
             if ( priority <= failurePriority && !excludeFromFile.isExcludedFromFailure( violation ) )
             {
                 failures.add( violation );
                 if ( printFailingErrors )
                 {
                     printError( violation, "Failure" );
                 }
             }
             else
             {
                 warnings.add( violation );
             }
         }
 
         final ViolationDetails<D> details = newViolationDetailsInstance();
         details.setFailureDetails( failures );
         details.setWarningDetails( warnings );
         return details;
     }
 
     protected abstract int getPriority( D errorDetail );
 
     protected abstract ViolationDetails<D> newViolationDetailsInstance();
 
     /**
      * Prints the warnings and failures
      *
      * @param failures list of failures
      * @param warnings list of warnings
      */
     protected void printErrors( final List<D> failures, final List<D> warnings )
     {
         for ( final D warning : warnings )
         {
             printError( warning, "Warning" );
         }
 
         for ( final D failure : failures )
         {
             printError( failure, "Failure" );
         }
     }
 
     /**
      * Gets the output message
      *
      * @param failureCount
      * @param warningCount
      * @param key
      * @param outputFile
      * @return
      */
     private String getMessage( final int failureCount, final int warningCount, final String key, final File outputFile )
     {
         final StringBuilder message = new StringBuilder( 256 );
         if ( failureCount > 0 || warningCount > 0 )
         {
             if ( failureCount > 0 )
             {
                 message.append( "You have " ).append( failureCount ).append( " " ).append( key ).
                   append( failureCount > 1 ? "s" : "" );
             }
 
             if ( warningCount > 0 )
             {
                 if ( failureCount > 0 )
                 {
                     message.append( " and " );
                 }
                 else
                 {
                     message.append( "You have " );
                 }
                 message.append( warningCount ).append( " warning" ).append( warningCount > 1 ? "s" : "" );
             }
 
             message.append( ". For more details see: " ).append( outputFile.getAbsolutePath() );
         }
         return message.toString();
     }
 
     /**
      * Formats the failure details and prints them as an INFO message
      *
      * @param item either a {@link org.apache.maven.plugins.pmd.model.Violation} from PMD
      * or a {@link org.apache.maven.plugins.pmd.model.Duplication} from CPD
      * @param severity the found issue is prefixed with the given severity, usually "Warning" or "Failure".
      */
     protected abstract void printError( D item, String severity );
 
     /**
      * Gets the attributes and text for the violation tag and puts them in a HashMap
      *
      * @param analysisFile the xml output from PMD or CPD
      * @return all PMD {@link org.apache.maven.plugins.pmd.model.Violation}s
      * or CPD {@link org.apache.maven.plugins.pmd.model.Duplication}s.
      * @throws XmlPullParserException if the analysis file contains invalid XML
      * @throws IOException if the analysis file could be read
      */
     protected abstract List<D> getErrorDetails( File analysisFile )
         throws XmlPullParserException, IOException;
 
     public boolean isFailOnViolation()
     {
         return failOnViolation;
     }
 }