code: /*
   * Copyright (c) 2008-2019 Emmanuel Dupuy.
   * This project is distributed under the GPLv3 license.
   * This is a Copyleft license that gives the user the right to use, 
   * copy and modify the code freely for non-commercial purposes.
   */
  
  package org.jd.gui.service.fileloader;
  
  import org.jd.gui.api.API;
  import org.jd.gui.util.io.TextReader;
  
  import java.io.File;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  public class JavaFileLoaderProvider extends AbstractTypeFileLoaderProvider {
      protected static final String[] EXTENSIONS = { "java" };
  
      @Override public String[] getExtensions() { return EXTENSIONS; }
      @Override public String getDescription() { return "Java files (*.java)"; }
  
      @Override
      public boolean accept(API api, File file) {
          return file.exists() && file.isFile() && file.canRead() && file.getName().toLowerCase().endsWith(".java");
      }
  
      @Override
      public boolean load(API api, File file) {
          String text = TextReader.getText(file);
          Pattern pattern = Pattern.compile("(?s)(.*\\s)?package\\s+(\\S+)\\s*;.*");
          Matcher matcher = pattern.matcher(text);
  
          if (matcher.matches()) {
              // Package name found
              String pathInFile = matcher.group(2).replace(".", File.separator) + File.separator + file.getName();
  
              return load(api, file, pathInFile);
          } else {
              // Package name not found
              return load(api, file, file.getName());
          }
      }
  }
  