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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.
*
*/
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>
* 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.
*
*/
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;
}
}
}
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