content: /*
   *  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
   *
   *      https://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.tools.ant.types.optional.depend;
  
  import java.io.File;
  import java.util.Set;
  import java.util.Vector;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  
  import org.apache.tools.ant.BuildException;
  import org.apache.tools.ant.DirectoryScanner;
  import org.apache.tools.ant.types.Path;
  import org.apache.tools.ant.util.StreamUtils;
  import org.apache.tools.ant.util.depend.DependencyAnalyzer;
  
  /**
   * DirectoryScanner for finding class dependencies.
   */
  public class DependScanner extends DirectoryScanner {
      /**
       * The name of the analyzer to use by default.
       */
      public static final String DEFAULT_ANALYZER_CLASS
          = "org.apache.tools.ant.util.depend.bcel.FullAnalyzer";
  
      /**
       * The root classes to drive the search for dependent classes.
       */
      private Vector<String> rootClasses;
  
      /**
       * The names of the classes to include in the fileset.
       */
      private Vector<String> included;
  
      private Vector<File> additionalBaseDirs = new Vector<>();
  
      /**
       * The parent scanner which gives the basic set of files. Only files which
       * are in this set and which can be reached from a root class will end
       * up being included in the result set.
       */
      private DirectoryScanner parentScanner;
  
      /**
       * Create a DependScanner, using the given scanner to provide the basic
       * set of files from which class files come.
       *
       * @param parentScanner the DirectoryScanner which returns the files from
       *        which class files must come.
       */
      public DependScanner(DirectoryScanner parentScanner) {
          this.parentScanner = parentScanner;
      }
  
      /**
       * Sets the root classes to be used to drive the scan.
       *
       * @param rootClasses the rootClasses to be used for this scan.
       */
      public synchronized void setRootClasses(Vector<String> rootClasses) {
          this.rootClasses = rootClasses;
      }
  
      /**
       * Get the names of the class files on which baseClass depends.
       *
       * @return the names of the files.
       */
      @Override
      public String[] getIncludedFiles() {
          return included.toArray(new String[getIncludedFilesCount()]);
      }
  
      /** {@inheritDoc}. */
      @Override
      public synchronized int getIncludedFilesCount() {
          if (included == null) {
              throw new IllegalStateException();
          }
          return included.size();
      }
  
      /**
       * Scans the base directory for files on which baseClass depends.
       *
       * @exception IllegalStateException when basedir was set incorrectly.
       */
      @Override
      public synchronized void scan() throws IllegalStateException {
          included = new Vector<>();
          String analyzerClassName = DEFAULT_ANALYZER_CLASS;
          DependencyAnalyzer analyzer;
          try {
              Class<? extends DependencyAnalyzer> analyzerClass =
                  Class.forName(analyzerClassName)
                      .asSubclass(DependencyAnalyzer.class);
              analyzer = analyzerClass.newInstance();
          } catch (Exception e) {
              throw new BuildException("Unable to load dependency analyzer: "
                                       + analyzerClassName, e);
          }
          analyzer.addClassPath(new Path(null, basedir.getPath()));
          additionalBaseDirs.stream().map(File::getPath)
              .map(p -> new Path(null, p)).forEach(analyzer::addClassPath);
  
          rootClasses.forEach(analyzer::addRootClass);
  
          Set<String> parentSet = Stream.of(parentScanner.getIncludedFiles())
              .collect(Collectors.toSet());
  
          // This is included
          StreamUtils.enumerationAsStream(analyzer.getClassDependencies())
                  .map(cName -> cName.replace('.', File.separatorChar) + ".class")
                  .filter(fName -> new File(basedir, fName).exists() && parentSet.contains(fName))
                  .forEach(fName -> included.addElement(fName));
      }
  
      /**
       * @see DirectoryScanner#addDefaultExcludes
       */
      @Override
      public void addDefaultExcludes() {
      }
  
      /**
       * @see DirectoryScanner#getExcludedDirectories
       * {@inheritDoc}.
       */
      @Override
      public String[] getExcludedDirectories() {
          return null;
      }
  
      /**
       * @see DirectoryScanner#getExcludedFiles
       * {@inheritDoc}.
       */
      @Override
      public String[] getExcludedFiles() {
          return null;
      }
  
      /**
       * @see DirectoryScanner#getIncludedDirectories
       * {@inheritDoc}.
       */
      @Override
      public String[] getIncludedDirectories() {
          return new String[0];
      }
  
      /**
       * @see DirectoryScanner#getIncludedDirsCount
       * {@inheritDoc}.
       */
      @Override
      public int getIncludedDirsCount() {
          return 0;
      }
  
      /**
       * @see DirectoryScanner#getNotIncludedDirectories
       * {@inheritDoc}.
       */
      @Override
      public String[] getNotIncludedDirectories() {
          return null;
      }
  
      /**
       * @see DirectoryScanner#getNotIncludedFiles
       * {@inheritDoc}.
       */
      @Override
      public String[] getNotIncludedFiles() {
          return null;
      }
  
      /**
       * @see DirectoryScanner#setExcludes
       * {@inheritDoc}.
       */
      @Override
      public void setExcludes(String[] excludes) {
      }
  
      /**
       * @see DirectoryScanner#setIncludes
       * {@inheritDoc}.
       */
      @Override
      public void setIncludes(String[] includes) {
      }
  
      /**
       * @see DirectoryScanner#setCaseSensitive
       * {@inheritDoc}.
       */
      @Override
      public void setCaseSensitive(boolean isCaseSensitive) {
      }
  
      public void addBasedir(File baseDir) {
          additionalBaseDirs.addElement(baseDir);
      }
  }
  