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'rapiddweller Common' is an open source Java library forked from Databene Commons by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * Licensed 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.
 */

package com.rapiddweller.common.file;

import com.rapiddweller.common.ArrayUtil;
import com.rapiddweller.common.Element;
import com.rapiddweller.common.TreeModel;
import com.rapiddweller.common.Visitor;

import java.io.File;
import java.util.Arrays;
import java.util.Comparator;

/**
 * databene TreeModel implementation for files.
 * Created: 08.05.2007 17:55:54
 *
 * @author Volker Bergmann
 */
public class FileTreeModel implements TreeModel, Element {

  private final File root;
  private final Comparator fileComparator;

  /**
   * Instantiates a new File tree model.
   *
   * @param root the root
   */
  public FileTreeModel(File root) {
    this(root, new FilenameComparator());
  }

  /**
   * Instantiates a new File tree model.
   *
   * @param root           the root
   * @param fileComparator the file comparator
   */
  public FileTreeModel(File root, Comparator fileComparator) {
    if (!root.exists()) {
      throw new IllegalArgumentException("File/Directory not found: " + root);
    }
    this.root = root;
    this.fileComparator = fileComparator;
  }

  @Override
  public File getRoot() {
    return root;
  }

  @Override
  public File getParent(File child) {
    return child.getParentFile();
  }

  @Override
  public File getChild(File parent, int index) {
    return listFiles(parent)[index];
  }

  @Override
  public int getChildCount(File parent) {
    if (parent.isFile()) {
      return 0;
    } else {
      return listFiles(parent).length;
    }
  }

  @Override
  public boolean isLeaf(File node) {
    return (node).isFile();
  }

  @Override
  public int getIndexOfChild(File parent, File child) {
    File[] files = listFiles(parent);
    return ArrayUtil.indexOf(child, files);
  }

  private File[] listFiles(File parent) {
    File[] files = parent.listFiles();
    if (files != null) {
      Arrays.sort(files, fileComparator);
    } else {
      files = new File[0];
    }
    return files;
  }

  @Override
  public void accept(Visitor visitor) {
    accept(visitor, root);
  }

  private void accept(Visitor visitor, File file) {
    visitor.visit(file);
    if (file.isDirectory()) {
      for (File child : file.listFiles()) {
        accept(visitor, child);
      }
    }
  }

}