package org.apache.maven.plugin.surefire.util;
   
   /*
    * 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 static org.apache.maven.plugin.surefire.util.ScannerUtil.convertJarFileResourceToJavaClassName;
  
  import java.io.File;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.Enumeration;
  import java.util.LinkedHashSet;
  import java.util.List;
  import java.util.Set;
  import java.util.jar.JarEntry;
  import java.util.jar.JarFile;
  
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.surefire.testset.TestFilter;
  import org.apache.maven.surefire.testset.TestListResolver;
  import org.apache.maven.surefire.util.DefaultScanResult;
  
  /**
   * Scans dependencies looking for tests.
   *
   * @author Aslak Knutsen
   */
  public class DependencyScanner
  {
      private final List<File> dependenciesToScan;
  
      private final TestListResolver filter;
  
      public DependencyScanner( List<File> dependenciesToScan, TestListResolver filter )
      {
          this.dependenciesToScan = dependenciesToScan;
          this.filter = filter;
      }
  
      public DefaultScanResult scan()
          throws MojoExecutionException
      {
          Set<String> classes = new LinkedHashSet<String>();
          for ( File artifact : dependenciesToScan )
          {
              try
              {
                  scanArtifact( artifact, filter, classes );
              }
              catch ( IOException e )
              {
                  throw new MojoExecutionException( "Could not scan dependency " + artifact.toString(), e );
              }
          }
          return new DefaultScanResult( new ArrayList<String>( classes ) );
      }
  
      private static void scanArtifact( File artifact, TestFilter<String, String> filter, Set<String> classes )
          throws IOException
      {
          if ( artifact != null && artifact.isFile() )
          {
              JarFile jar = null;
              try
              {
                  jar = new JarFile( artifact );
                  for ( Enumeration<JarEntry> entries = jar.entries(); entries.hasMoreElements(); )
                  {
                      JarEntry entry = entries.nextElement();
                      if ( filter.shouldRun( entry.getName(), null ) )
                      {
                          classes.add( convertJarFileResourceToJavaClassName( entry.getName() ) );
                      }
                  }
              }
              finally
              {
                  if ( jar != null )
                  {
                      jar.close();
                  }
              }
         }
     }
 
     public static List<File> filter( List<Artifact> artifacts, List<String> groupArtifactIds )
     {
         List<File> matches = new ArrayList<File>();
         if ( groupArtifactIds == null || artifacts == null )
         {
             return matches;
         }
         for ( Artifact artifact : artifacts )
         {
             for ( String groups : groupArtifactIds )
             {
                 String[] groupArtifact = groups.split( ":" );
                 if ( groupArtifact.length != 2 )
                 {
                     throw new IllegalArgumentException( "dependencyToScan argument should be in format"
                         + " 'groupid:artifactid': " + groups );
                 }
                 if ( artifact.getGroupId().matches( groupArtifact[0] )
                     && artifact.getArtifactId().matches( groupArtifact[1] ) )
                 {
                     matches.add( artifact.getFile() );
                 }
             }
         }
         return matches;
     }
 }