pt.webdetails.cda.utils.PathRelativizer.java Source code

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Here is the source code for pt.webdetails.cda.utils.PathRelativizer.java

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/*!
* Copyright 2002 - 2014 Webdetails, a Pentaho company.  All rights reserved.
*
* This software was developed by Webdetails and is provided under the terms
* of the Mozilla Public License, Version 2.0, or any later version. You may not use
* this file except in compliance with the license. If you need a copy of the license,
* please go to  http://mozilla.org/MPL/2.0/. The Initial Developer is Webdetails.
*
* Software distributed under the Mozilla Public License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or  implied. Please refer to
* the license for the specific language governing your rights and limitations.
*/

package pt.webdetails.cda.utils;

import org.apache.commons.io.FilenameUtils;
import org.apache.commons.lang.StringUtils;

public class PathRelativizer {

    private static final String MOCK_FILE = "mockFile.mockExtension";

    /**
     * Given two absolute paths, this method returns the targetPath relative to the basePath. It won't work with Windows
     * paths.
     *
     * @param basePath   Path to relativize against
     * @param targetPath Path to relativize
     * @return targetPath relative to basePath
     */
    public static String relativizePath(String basePath, String targetPath) {
        basePath = FilenameUtils.normalizeNoEndSeparator(basePath);
        targetPath = FilenameUtils.normalizeNoEndSeparator(targetPath);

        String[] basePathArray = basePath.length() > 1 ? basePath.split("/") : new String[] { "/" };
        String[] targetPathArray = targetPath.length() > 1 ? targetPath.split("/") : new String[] { "/" };

        //if we're dealing with folders, add a mock file
        if (basePathArray.length > 1 && !basePathArray[basePathArray.length - 1].contains(".")) {
            basePath += "/" + MOCK_FILE;
            basePathArray = basePath.split("/");
        }
        if (targetPathArray.length > 1 && !targetPathArray[targetPathArray.length - 1].contains(".")) {
            targetPath += "/" + MOCK_FILE;
            targetPathArray = targetPath.split("/");
        }

        int differCount = -1;
        for (int i = 0; (i < basePathArray.length) && (i < targetPathArray.length); i++) {
            if (basePathArray[i].equals(targetPathArray[i])) {
                continue;
            }
            differCount = i;
            break;
        }
        if (differCount == -1) {
            targetPathArray = cleanSamePath(basePathArray, targetPathArray);
            return StringUtils.join(targetPathArray, "/");
        } else {
            if (differCount == basePathArray.length - 1) { //case same folder or some folders ahead
                targetPathArray = cleanSamePath(basePathArray, targetPathArray);
                return StringUtils.join(targetPathArray, "/");
            } else { // case some folders back
                String backUp = "";
                for (int i = differCount; i < basePathArray.length - 1; i++) {
                    backUp += "../";
                }
                targetPathArray = cleanSamePath(basePathArray, targetPathArray);
                return backUp + StringUtils.join(targetPathArray, "/");
            }

        }

    }

    private static String[] cleanSamePath(String[] model, String[] dirty) {
        for (int i = 0; i < model.length; i++) {
            if (!dirty[i].equals(model[i])) {
                break;
            }
            dirty[i] = "";
        }
        return removeTrash(dirty);
    }

    private static String[] removeTrash(String[] dirty) {
        String clean = "";
        for (int i = 0; i < dirty.length; i++) {
            if (!StringUtils.isEmpty(dirty[i]) && !dirty[i].equals(MOCK_FILE)) {
                clean += dirty[i] + "/";
            }
        }
        return clean.split("/");
    }
}