Java tutorial
/* * Copyright 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 org.gradle.api.internal.file; import org.apache.commons.lang.StringUtils; import org.gradle.util.GUtil; import java.io.File; import java.util.ArrayList; import java.util.Arrays; import java.util.List; /** * @author Hans Dockter */ public class BaseDirConverter extends AbstractFileResolver { private final File baseDir; public BaseDirConverter(File baseDir) { this.baseDir = baseDir; } public String resolveAsRelativePath(Object path) { List<String> basePath = Arrays.asList(StringUtils.split(baseDir.getAbsolutePath(), "/" + File.separator)); File targetFile = resolve(path); List<String> targetPath = new ArrayList<String>( Arrays.asList(StringUtils.split(targetFile.getAbsolutePath(), "/" + File.separator))); // Find and remove common prefix int maxDepth = Math.min(basePath.size(), targetPath.size()); int prefixLen = 0; while (prefixLen < maxDepth && basePath.get(prefixLen).equals(targetPath.get(prefixLen))) { prefixLen++; } basePath = basePath.subList(prefixLen, basePath.size()); targetPath = targetPath.subList(prefixLen, targetPath.size()); for (int i = 0; i < basePath.size(); i++) { targetPath.add(0, ".."); } if (targetPath.isEmpty()) { return "."; } return GUtil.join(targetPath, File.separator); } @Override protected File doResolve(Object path) { if (!GUtil.isTrue(path) || !GUtil.isTrue(baseDir)) { throw new IllegalArgumentException(String.format( "Neither path nor baseDir may be null or empty string. path='%s' basedir='%s'", path, baseDir)); } File file = convertObjectToFile(path); if (!file.isAbsolute()) { file = new File(baseDir, file.getPath()); } return file; } }