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/* |
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* Licensed to the Apache Software Foundation (ASF) under one or more |
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* contributor license agreements. See the NOTICE file distributed with |
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* this work for additional information regarding copyright ownership. |
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* The ASF licenses this file to You under the Apache License, Version 2.0 |
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* (the "License"); you may not use this file except in compliance with |
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* the License. You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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* |
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*/ |
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package org.apache.tools.ant.taskdefs; |
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import java.io.File; |
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import java.io.IOException; |
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import java.io.RandomAccessFile; |
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import java.util.Iterator; |
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import org.apache.tools.ant.BuildException; |
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import org.apache.tools.ant.Project; |
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import org.apache.tools.ant.Task; |
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import org.apache.tools.ant.types.EnumeratedAttribute; |
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import org.apache.tools.ant.types.Path; |
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import org.apache.tools.ant.types.ResourceCollection; |
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import org.apache.tools.ant.types.resources.FileResource; |
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import org.apache.tools.ant.util.FileUtils; |
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import org.apache.tools.ant.util.StringUtils; |
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/** |
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* Set the length of one or more files, as the intermittently available |
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* <code>truncate</code> Unix utility/function. |
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* @since Ant 1.7.1 |
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*/ |
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public class Truncate extends Task { |
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private static final Long ZERO = new Long(0L); |
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private static final String NO_CHILD = "No files specified."; |
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private static final String INVALID_LENGTH = "Cannot truncate to length "; |
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private static final String READ_WRITE = "rw"; |
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private static final FileUtils FILE_UTILS = FileUtils.getFileUtils(); |
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private static final byte[] FILL_BUFFER = new byte[1024]; |
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private Path path; |
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private boolean create = true; |
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private boolean mkdirs = false; |
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private Long length; |
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private Long adjust; |
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/** |
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* Set a single target File. |
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* @param f the single File |
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*/ |
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public void setFile(File f) { |
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add(new FileResource(f)); |
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} |
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/** |
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* Add a nested (filesystem-only) ResourceCollection. |
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* @param rc the ResourceCollection to add. |
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*/ |
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public void add(ResourceCollection rc) { |
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getPath().add(rc); |
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} |
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/** |
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* Set the amount by which files' lengths should be adjusted. |
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* It is permissible to append K / M / G / T / P. |
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* @param adjust (positive or negative) adjustment amount. |
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*/ |
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public void setAdjust(Long adjust) { |
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this.adjust = adjust; |
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} |
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/** |
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* Set the length to which files should be set. |
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* It is permissible to append K / M / G / T / P. |
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* @param adjust (positive) adjustment amount. |
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*/ |
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public void setLength(Long length) { |
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this.length = length; |
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if (length != null && length.longValue() < 0) { |
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throw new BuildException(INVALID_LENGTH + length); |
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} |
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} |
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/** |
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* Set whether to create nonexistent files. |
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* @param create boolean, default <code>true</code>. |
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*/ |
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public void setCreate(boolean create) { |
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this.create = create; |
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} |
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/** |
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* Set whether, when creating nonexistent files, nonexistent directories |
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* should also be created. |
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* @param mkdirs boolean, default <code>false</code>. |
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*/ |
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public void setMkdirs(boolean mkdirs) { |
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this.mkdirs = mkdirs; |
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} |
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/** {@inheritDoc}. */ |
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public void execute() { |
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if (length != null && adjust != null) { |
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throw new BuildException( |
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"length and adjust are mutually exclusive options"); |
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} |
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if (length == null && adjust == null) { |
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length = ZERO; |
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} |
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if (path == null) { |
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throw new BuildException(NO_CHILD); |
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} |
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for (Iterator it = path.iterator(); it.hasNext();) { |
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File f = ((FileResource) it.next()).getFile(); |
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if (shouldProcess(f)) { |
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process(f); |
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} |
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} |
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} |
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private boolean shouldProcess(File f) { |
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if (f.isFile()) { |
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return true; |
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} |
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if (!create) { |
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return false; |
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} |
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Exception exception = null; |
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try { |
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if (FILE_UTILS.createNewFile(f, mkdirs)) { |
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return true; |
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} |
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} catch (IOException e) { |
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exception = e; |
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} |
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String msg = "Unable to create " + f; |
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if (exception == null) { |
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log(msg, Project.MSG_WARN); |
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return false; |
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} |
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throw new BuildException(msg, exception); |
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} |
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private void process(File f) { |
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long len = f.length(); |
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long newLength = length == null |
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? len + adjust.longValue() : length.longValue(); |
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if (len == newLength) { |
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//nothing to do! |
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return; |
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} |
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RandomAccessFile raf = null; |
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try { |
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raf = new RandomAccessFile(f, READ_WRITE); |
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} catch (Exception e) { |
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throw new BuildException("Could not open " + f + " for writing", e); |
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} |
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try { |
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if (newLength > len) { |
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long pos = len; |
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raf.seek(pos); |
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while (pos < newLength) { |
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long writeCount = Math.min(FILL_BUFFER.length, |
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newLength - pos); |
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raf.write(FILL_BUFFER, 0, (int) writeCount); |
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pos += writeCount; |
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} |
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} else { |
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raf.setLength(newLength); |
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} |
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} catch (IOException e) { |
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throw new BuildException("Exception working with " + raf, e); |
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} finally { |
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try { |
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raf.close(); |
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} catch (IOException e) { |
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log("Caught " + e + " closing " + raf, Project.MSG_WARN); |
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} |
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} |
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} |
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private synchronized Path getPath() { |
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if (path == null) { |
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path = new Path(getProject()); |
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} |
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return path; |
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} |
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} |
Matthew Jason Benson