/**
 * Copyright 1996-2014 FoxBPM ORG.
 *
 * 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.
 * 
 * @author kenshin
 */
package org.foxbpm.engine.impl.util;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

import org.foxbpm.engine.exception.FoxBPMException;

/**
 * 文件操作工具类
 * 
 * @author Administrator
 * 
 */
public class FileUtil {
	public static void unZip(String zipfile, String destDir) {
		byte b[] = new byte[1024];
		OutputStream outputStream = null;
		InputStream inputStream = null;
		ZipFile zipFile = null;
		int length;
		try {
			DeleteFolder(destDir);
			zipFile = new ZipFile(zipfile);
			Enumeration<? extends ZipEntry> enumeration = zipFile.entries();
			ZipEntry zipEntry = null;
			while (enumeration.hasMoreElements()) {
				zipEntry = enumeration.nextElement();
				File loadFile = new File(new StringBuffer(destDir).append(File.separator)
						.append(zipEntry.getName()).toString());
				if (zipEntry.isDirectory()) {
					loadFile.mkdirs();
				} else {
					File parentFile = loadFile.getParentFile();
					if (!parentFile.exists()) {
						parentFile.mkdirs();
					}
					outputStream = new FileOutputStream(loadFile);
					inputStream = zipFile.getInputStream(zipEntry);
					while ((length = inputStream.read(b)) > 0) {
						outputStream.write(b, 0, length);
					}
					if (outputStream != null) {
						outputStream.close();
					}
				}
			}
		} catch (IOException e) {
			throw new FoxBPMException("解压文件：" + zipfile + "失败！", e);
		} finally {
			try {
				if (outputStream != null) {
					outputStream.close();
				}
				if (inputStream != null) {
					inputStream.close();
				}
				if (zipFile != null) {
					zipFile.close();
				}
			} catch (Exception e2) {
				throw new FoxBPMException("关闭流失败！", e2);
			}

		}

	}

	/**
	 * 根据路径删除指定的目录或文件，无论存在与否
	 * 
	 * @param sPath
	 *            要删除的目录或文件
	 * @return 删除成功返回 true，否则返回 false。
	 */
	public static boolean DeleteFolder(String sPath) {
		File file = new File(sPath);
		// 判断目录或文件是否存在
		if (!file.exists()) { // 不存在返回 false
			return true;
		} else {
			// 判断是否为文件
			if (file.isFile()) { // 为文件时调用删除文件方法
				return deleteFile(sPath);
			} else { // 为目录时调用删除目录方法
				return deleteDirectory(sPath);
			}
		}
	}

	/**
	 * 删除单个文件
	 * 
	 * @param sPath
	 *            被删除文件的文件名
	 * @return 单个文件删除成功返回true，否则返回false
	 */
	public static boolean deleteFile(String sPath) {
		boolean flag = false;
		File file = new File(sPath);
		// 路径为文件且不为空则进行删除
		if (file.isFile() && file.exists()) {
			file.delete();
			flag = true;
		}
		return flag;
	}

	/**
	 * 删除目录（文件夹）以及目录下的文件
	 * 
	 * @param sPath
	 *            被删除目录的文件路径
	 * @return 目录删除成功返回true，否则返回false
	 */
	public static boolean deleteDirectory(String sPath) {
		// 如果sPath不以文件分隔符结尾，自动添加文件分隔符
		if (!sPath.endsWith(File.separator)) {
			sPath = sPath + File.separator;
		}
		File dirFile = new File(sPath);
		// 如果dir对应的文件不存在，或者不是一个目录，则退出
		if (!dirFile.exists() || !dirFile.isDirectory()) {
			return false;
		}
		boolean flag = true;
		// 删除文件夹下的所有文件(包括子目录)
		File[] files = dirFile.listFiles();
		for (int i = 0; i < files.length; i++) {
			// 删除子文件
			if (files[i].isFile()) {
				flag = deleteFile(files[i].getAbsolutePath());
				if (!flag)
					break;
			} // 删除子目录
			else {
				flag = deleteDirectory(files[i].getAbsolutePath());
				if (!flag)
					break;
			}
		}
		if (!flag)
			return false;
		// 删除当前目录
		if (dirFile.delete()) {
			return true;
		} else {
			return false;
		}
	}
}