Touch.java
/*
* 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.taskdefs;
import java.io.File;
import java.io.IOException;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.List;
import java.util.Vector;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.DirectoryScanner;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.types.FileList;
import org.apache.tools.ant.types.FileSet;
import org.apache.tools.ant.types.Mapper;
import org.apache.tools.ant.types.Resource;
import org.apache.tools.ant.types.ResourceCollection;
import org.apache.tools.ant.types.resources.FileProvider;
import org.apache.tools.ant.types.resources.FileResource;
import org.apache.tools.ant.types.resources.Touchable;
import org.apache.tools.ant.types.resources.Union;
import org.apache.tools.ant.util.DateUtils;
import org.apache.tools.ant.util.FileNameMapper;
import org.apache.tools.ant.util.FileUtils;
/**
* Touch a file and/or fileset(s) and/or filelist(s);
* corresponds to the Unix touch command.
*
* <p>If the file to touch doesn't exist, an empty one is created.</p>
*
* @since Ant 1.1
*
* @ant.task category="filesystem"
*/
public class Touch extends Task {
public interface DateFormatFactory {
DateFormat getPrimaryFormat();
DateFormat getFallbackFormat();
}
/**
* Provides access to DateUtils.EN_US_DATE_FORMAT_MIN (primary) and
* DateUtils.EN_US_DATE_FORMAT_SEC (fallback).
*/
public static final DateFormatFactory DEFAULT_DF_FACTORY
= new DateFormatFactory() {
@Override
public DateFormat getPrimaryFormat() {
return DateUtils.EN_US_DATE_FORMAT_MIN.get();
}
@Override
public DateFormat getFallbackFormat() {
return DateUtils.EN_US_DATE_FORMAT_SEC.get();
}
};
private static final FileUtils FILE_UTILS = FileUtils.getFileUtils();
private File file;
private long millis = -1;
private String dateTime;
private List<FileSet> filesets = new Vector<>();
private Union resources;
private boolean dateTimeConfigured;
private boolean mkdirs;
private boolean verbose = true;
private FileNameMapper fileNameMapper = null;
private DateFormatFactory dfFactory = DEFAULT_DF_FACTORY;
/**
* Sets a single source file to touch. If the file does not exist
* an empty file will be created.
* @param file the <code>File</code> to touch.
*/
public void setFile(File file) {
this.file = file;
}
/**
* Set the new modification time of file(s) touched
* in milliseconds since midnight Jan 1 1970. Optional, default=now.
* @param millis the <code>long</code> timestamp to use.
*/
public void setMillis(long millis) {
this.millis = millis;
}
/**
* Set the new modification time of file(s) touched
* in the format "MM/DD/YYYY HH:MM AM <i>or</i> PM"
* or "MM/DD/YYYY HH:MM:SS AM <i>or</i> PM".
* Optional, default=now.
* @param dateTime the <code>String</code> date in the specified format.
*/
public void setDatetime(String dateTime) {
if (this.dateTime != null) {
log("Resetting datetime attribute to " + dateTime, Project.MSG_VERBOSE);
}
this.dateTime = dateTime;
dateTimeConfigured = false;
}
/**
* Set whether nonexistent parent directories should be created
* when touching new files.
* @param mkdirs <code>boolean</code> whether to create parent directories.
* @since Ant 1.6.3
*/
public void setMkdirs(boolean mkdirs) {
this.mkdirs = mkdirs;
}
/**
* Set whether the touch task will report every file it creates;
* defaults to <code>true</code>.
* @param verbose <code>boolean</code> flag.
* @since Ant 1.6.3
*/
public void setVerbose(boolean verbose) {
this.verbose = verbose;
}
/**
* Set the format of the datetime attribute.
* @param pattern the <code>SimpleDateFormat</code>-compatible format pattern.
* @since Ant 1.6.3
*/
public void setPattern(final String pattern) {
dfFactory = new DateFormatFactory() {
@Override
public DateFormat getPrimaryFormat() {
return new SimpleDateFormat(pattern);
}
@Override
public DateFormat getFallbackFormat() {
return null;
}
};
}
/**
* Add a <code>Mapper</code>.
* @param mapper the <code>Mapper</code> to add.
* @since Ant 1.6.3
*/
public void addConfiguredMapper(Mapper mapper) {
add(mapper.getImplementation());
}
/**
* Add a <code>FileNameMapper</code>.
* @param fileNameMapper the <code>FileNameMapper</code> to add.
* @since Ant 1.6.3
* @throws BuildException if multiple mappers are added.
*/
public void add(FileNameMapper fileNameMapper) throws BuildException {
if (this.fileNameMapper != null) {
throw new BuildException(
"Only one mapper may be added to the %s task.", getTaskName());
}
this.fileNameMapper = fileNameMapper;
}
/**
* Add a set of files to touch.
* @param set the <code>Fileset</code> to add.
*/
public void addFileset(FileSet set) {
filesets.add(set);
add(set);
}
/**
* Add a filelist to touch.
* @param list the <code>Filelist</code> to add.
*/
public void addFilelist(FileList list) {
add(list);
}
/**
* Add a collection of resources to touch.
* @param rc the collection to add.
* @since Ant 1.7
*/
public synchronized void add(ResourceCollection rc) {
resources = resources == null ? new Union() : resources;
resources.add(rc);
}
/**
* Check that this task has been configured properly.
* @throws BuildException if configuration errors are detected.
* @since Ant 1.6.3
*/
protected synchronized void checkConfiguration() throws BuildException {
if (file == null && resources == null) {
throw new BuildException(
"Specify at least one source--a file or resource collection.");
}
if (file != null && file.exists() && file.isDirectory()) {
throw new BuildException("Use a resource collection to touch directories.");
}
if (dateTime != null && !dateTimeConfigured) {
long workmillis = millis;
if ("now".equalsIgnoreCase(dateTime)) {
workmillis = System.currentTimeMillis();
} else {
DateFormat df = dfFactory.getPrimaryFormat();
ParseException pe = null;
try {
workmillis = df.parse(dateTime).getTime();
} catch (ParseException peOne) {
df = dfFactory.getFallbackFormat();
if (df == null) {
pe = peOne;
} else {
try {
workmillis = df.parse(dateTime).getTime();
} catch (ParseException peTwo) {
pe = peTwo;
}
}
}
if (pe != null) {
throw new BuildException(pe.getMessage(), pe, getLocation());
}
if (workmillis < 0) {
throw new BuildException(
"Date of %s results in negative milliseconds value relative to epoch (January 1, 1970, 00:00:00 GMT).",
dateTime);
}
}
log("Setting millis to " + workmillis + " from datetime attribute",
((millis < 0) ? Project.MSG_DEBUG : Project.MSG_VERBOSE));
setMillis(workmillis);
// only set if successful to this point:
dateTimeConfigured = true;
}
}
/**
* Execute the touch operation.
*
* @throws BuildException
* if an error occurs.
*/
@Override
public void execute() throws BuildException {
checkConfiguration();
touch();
}
/**
* Does the actual work; assumes everything has been checked by now.
* @throws BuildException if an error occurs.
*/
protected void touch() throws BuildException {
long defaultTimestamp = getTimestamp();
if (file != null) {
touch(new FileResource(file.getParentFile(), file.getName()),
defaultTimestamp);
}
if (resources == null) {
return;
}
// deal with the resource collections
for (Resource r : resources) {
Touchable t = r.as(Touchable.class);
if (t == null) {
throw new BuildException("Can't touch " + r);
}
touch(r, defaultTimestamp);
}
// deal with filesets in a special way since the task
// originally also used the directories and Union won't return
// them.
for (FileSet fs : filesets) {
DirectoryScanner ds = fs.getDirectoryScanner(getProject());
File fromDir = fs.getDir(getProject());
for (String srcDir : ds.getIncludedDirectories()) {
touch(new FileResource(fromDir, srcDir), defaultTimestamp);
}
}
}
/**
* Touch a single file with the current timestamp (this.millis). This method
* does not interact with any nested mappers and remains for reasons of
* backwards-compatibility only.
* @param file file to touch
* @throws BuildException on error
* @deprecated since 1.6.x.
*/
@Deprecated
protected void touch(File file) {
touch(file, getTimestamp());
}
private long getTimestamp() {
return (millis < 0) ? System.currentTimeMillis() : millis;
}
private void touch(Resource r, long defaultTimestamp) {
if (fileNameMapper == null) {
FileProvider fp = r.as(FileProvider.class);
if (fp != null) {
// use this to create file and deal with non-writable files
touch(fp.getFile(), defaultTimestamp);
} else {
r.as(Touchable.class).touch(defaultTimestamp);
}
} else {
String[] mapped = fileNameMapper.mapFileName(r.getName());
if (mapped != null && mapped.length > 0) {
long modTime = defaultTimestamp;
if (millis < 0 && r.isExists()) {
modTime = r.getLastModified();
}
for (int i = 0; i < mapped.length; i++) {
touch(getProject().resolveFile(mapped[i]), modTime);
}
}
}
}
private void touch(File file, long modTime) {
if (!file.exists()) {
log("Creating " + file,
((verbose) ? Project.MSG_INFO : Project.MSG_VERBOSE));
try {
FILE_UTILS.createNewFile(file, mkdirs);
} catch (IOException ioe) {
throw new BuildException("Could not create " + file, ioe,
getLocation());
}
}
if (!file.canWrite()) {
throw new BuildException(
"Can not change modification date of read-only file %s", file);
}
FILE_UTILS.setFileLastModified(file, modTime);
}
}