/*
* 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.ant.compress.taskdefs;
import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.ant.compress.util.CompressorStreamFactory;
import org.apache.ant.compress.util.StreamHelper;
import org.apache.commons.compress.compressors.CompressorInputStream;
import org.apache.commons.compress.utils.IOUtils;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.util.FileUtils;
import org.apache.tools.ant.taskdefs.Unpack;
/**
* Expands a resource that has been compressed.
*
*/
public abstract class UnpackBase extends Unpack {
private static final int BUFFER_SIZE = 8 * 1024;
private final String defaultExtension;
private CompressorStreamFactory factory;
protected UnpackBase(String defaultExtension,
CompressorStreamFactory factory) {
this(defaultExtension);
setFactory(factory);
}
/**
* @since Apache Compress Antlib 1.1
*/
protected UnpackBase(String defaultExtension) {
this.defaultExtension = defaultExtension;
}
/**
* @since Apache Compress Antlib 1.1
*/
protected final void setFactory(CompressorStreamFactory factory) {
this.factory = factory;
}
/**
* Get the default extension.
*/
protected final String getDefaultExtension() {
return defaultExtension;
}
/**
* Implement the gunzipping.
*/
protected void extract() {
if (source.lastModified() > dest.lastModified()) {
log("Expanding " + source.getAbsolutePath() + " to "
+ dest.getAbsolutePath());
FileOutputStream out = null;
CompressorInputStream zIn = null;
InputStream fis = null;
try {
out = new FileOutputStream(dest);
zIn = StreamHelper.getInputStream(factory, srcResource);
if (zIn == null) {
fis = srcResource.getInputStream();
zIn = factory.getCompressorStream(new BufferedInputStream(fis));
}
IOUtils.copy(zIn, out, BUFFER_SIZE);
} catch (IOException ioe) {
String msg = "Problem expanding " + ioe.getMessage();
throw new BuildException(msg, ioe, getLocation());
} finally {
FileUtils.close(fis);
FileUtils.close(out);
FileUtils.close(zIn);
}
}
}
/**
* Yes, we can.
*/
protected final boolean supportsNonFileResources() {
return true;
}
}