| /* |
| * 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. |
| * |
| */ |
| |
| package org.apache.tools.ant.types.selectors; |
| |
| import java.io.File; |
| import java.io.IOException; |
| |
| import org.apache.tools.ant.BuildException; |
| import org.apache.tools.ant.util.FileUtils; |
| |
| /** |
| * This selector selects files against a mapped set of target files, selecting |
| * all those files which are different. |
| * Files with different lengths are deemed different |
| * automatically |
| * Files with identical timestamps are viewed as matching by |
| * default, unless you specify otherwise. |
| * Contents are compared if the lengths are the same |
| * and the timestamps are ignored or the same, |
| * except if you decide to ignore contents to gain speed. |
| * <p> |
| * This is a useful selector to work with programs and tasks that don't handle |
| * dependency checking properly; Even if a predecessor task always creates its |
| * output files, followup tasks can be driven off copies made with a different |
| * selector, so their dependencies are driven on the absolute state of the |
| * files, not a timestamp. |
| * </p> |
| * <p> |
| * Clearly, however, bulk file comparisons is inefficient; anything that can |
| * use timestamps is to be preferred. If this selector must be used, use it |
| * over as few files as possible, perhaps following it with an <uptodate> |
| * to keep the descendant routines conditional. |
| * </p> |
| */ |
| public class DifferentSelector extends MappingSelector { |
| |
| private static final FileUtils FILE_UTILS = FileUtils.getFileUtils(); |
| |
| private boolean ignoreFileTimes = true; |
| private boolean ignoreContents = false; |
| |
| |
| /** |
| * This flag tells the selector to ignore file times in the comparison |
| * @param ignoreFileTimes if true ignore file times |
| */ |
| public void setIgnoreFileTimes(boolean ignoreFileTimes) { |
| this.ignoreFileTimes = ignoreFileTimes; |
| } |
| /** |
| * This flag tells the selector to ignore contents |
| * @param ignoreContents if true ignore contents |
| * @since ant 1.6.3 |
| */ |
| public void setIgnoreContents(boolean ignoreContents) { |
| this.ignoreContents = ignoreContents; |
| } |
| /** |
| * this test is our selection test that compared the file with the destfile |
| * @param srcfile the source file |
| * @param destfile the destination file |
| * @return true if the files are different |
| */ |
| protected boolean selectionTest(File srcfile, File destfile) { |
| |
| //if either of them is missing, they are different |
| if (srcfile.exists() != destfile.exists()) { |
| return true; |
| } |
| |
| if (srcfile.length() != destfile.length()) { |
| // different size =>different files |
| return true; |
| } |
| |
| if (!ignoreFileTimes) { |
| //same date if dest timestamp is within granularity of the srcfile |
| boolean sameDate; |
| sameDate = destfile.lastModified() >= srcfile.lastModified() - granularity |
| && destfile.lastModified() <= srcfile.lastModified() + granularity; |
| |
| // different dates => different files |
| if (!sameDate) { |
| return true; |
| } |
| } |
| if (!ignoreContents) { |
| //here do a bulk comparison |
| try { |
| return !FILE_UTILS.contentEquals(srcfile, destfile); |
| } catch (IOException e) { |
| throw new BuildException("while comparing " + srcfile + " and " |
| + destfile, e); |
| } |
| } else { |
| return false; |
| } |
| } |
| } |