Mega Code Archive
Merges the two paths to create a valid version of the second path
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/*
* 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
*
* 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.
*
*/
import java.io.File;
/**
*
* FileUtils is a collection of routines for common file system operations.
*
* @author Dan Jemiolo (danj)
*
*/
public final class FileUtils {
/**
*
* Merges the two paths to create a valid version of the second path. This
* method should be used when you encounter a relative path in a document and
* must resolve it based on the path of the current document. An example would
* be: <br>
* <br>
* <b>original path</b> - files/customers/Orders.xml <br>
* <br>
* <b>relative path</b> - ../Accounts.xml <br>
* <br>
* <b>result</b> - files/customers/Accounts.xml <br>
* <br>
* The only time this method cannot be used is if the original path is for a
* file that is in the root (has no directory as part of its path) and the
* relative path starts with "..".
*
* @param originalPath
* The path of the file that references another file.
*
* @param relativePath
* The path of the other file, which is relative to the original.
*
* @return A proper path for the other file, one that can be used to open and
* verify the file.
*
*/
public static String createRelativePath(String originalPath, String relativePath) {
if (originalPath == null)
throw new NullPointerException("NullOriginalPath");
if (relativePath == null)
throw new NullPointerException("NullRelativePath");
//
// remove ./ if present
//
if (relativePath.startsWith("./"))
relativePath = relativePath.substring(2);
//
// remove any .. reference by taking off the last section/ of
// the original path
//
if (relativePath.startsWith("../")) {
int slash = originalPath.lastIndexOf('/');
originalPath = originalPath.substring(0, slash);
relativePath = relativePath.substring(3);
}
int slash = originalPath.lastIndexOf('/');
if (slash < 0)
return relativePath;
String dir = originalPath.substring(0, slash + 1);
return dir + relativePath;
}
}
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