Path Util
/*
* Copyright 2005-2010 the original author or authors.
* 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 sdloader.util;
import java.io.File;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.Stack;
/**
* PathUtils
*
* @author c9katayama
*
*/
public class PathUtil {
/**
* ????//???./???../?????????.
*/
public static String narrow(String path) {
path = replaceFileSeparator(path);
String[] paths = path.split("/");
Stack<String> narrowPathList = new Stack<String>();
for (int i = 0; i < paths.length; i++) {
if (paths[i].length() == 0 || paths[i].equals(".")) {
continue;
} else if (paths[i].equals("..")) {
if (narrowPathList.size() != 0) {
narrowPathList.pop();
}
} else {
narrowPathList.add(paths[i]);
}
}
boolean first = true;
String newPath = null;
for (String p : narrowPathList) {
if (first) {
newPath = path.startsWith("/") ? "/" : "";
first = false;
} else {
newPath += "/";
}
newPath += p;
}
if (path.endsWith("/")) {
newPath += "/";
}
return newPath;
}
/**
* ????????????????????
*
* @param basePath
* @param path
* @return
*/
public static String computeRelativePath(String basePath, String path) {
basePath = basePath.substring(0, basePath.lastIndexOf("/"));
return jointPathWithSlash(basePath, path);
}
/**
* 2?????"/"???????
*/
public static String jointPathWithSlash(String path1, String path2) {
path1 = removeEndSlashIfNeed(path1);
path2 = removeStartSlashIfNeed(path2);
return path1 + "/" + path2;
}
public static String appendStartSlashIfNeed(final String path) {
if (path != null && !startsWithSlash(path)) {
return "/" + path;
}
return path;
}
public static String appendEndSlashIfNeed(final String path) {
if (path != null && !endsWithSlash(path)) {
return path + "/";
}
return path;
}
public static String removeStartSlashIfNeed(final String path) {
if (path != null && startsWithSlash(path)) {
return path.substring(1, path.length());
}
return path;
}
public static String removeEndSlashIfNeed(final String path) {
if (path != null && path.endsWith("/")) {
return path.substring(0, path.length() - 1);
}
return path;
}
public static boolean startsWithSlash(final String path) {
if (isEmpty(path)) {
return false;
}
return path.indexOf("/") == 0;
}
public static boolean endsWithSlash(final String path) {
if (isEmpty(path)) {
return false;
}
return path.lastIndexOf("/") == path.length() - 1;
}
private static boolean isEmpty(String value) {
return (value == null || value.trim().length() == 0);
}
/**
* ????\\?/????????
*
* @param filepath
* @return
*/
public static final String replaceFileSeparator(String path) {
return path.replace('\\', '/');
}
public static final String getExtension(String path) {
if (path == null) {
return path;
}
int dot = path.lastIndexOf(".");
if (dot == -1) {
return null;
}
return path.substring(dot + 1, path.length());
}
/**
* ????????
*
* @param path
* @return
*/
public static final boolean isAbsolutePath(String path) {
String testPath = replaceFileSeparator(path);
if (testPath.startsWith("/") || testPath.indexOf(":") != -1) {
return true;
} else {
return false;
}
}
public static URL file2URL(String filePath) {
return file2URL(new File(filePath));
}
public static URL file2URL(File file) {
try {
return file.toURI().toURL();
} catch (MalformedURLException e) {
throw new RuntimeException(e);
}
}
public static File url2File(String urlPath) {
try {
return new File(new URI(urlPath));
} catch (URISyntaxException e) {
throw new RuntimeException(e);
}
}
public static File url2File(URL url) {
try {
return new File(new URI(url.toExternalForm()));
} catch (URISyntaxException e) {
throw new RuntimeException(e);
}
}
}
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