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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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package ch.boye.httpclientandroidlib.client.entity;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import ch.boye.httpclientandroidlib.HttpEntity;
import ch.boye.httpclientandroidlib.entity.HttpEntityWrapper;
import ch.boye.httpclientandroidlib.util.Args;
/**
* Common base class for decompressing {@link HttpEntity} implementations.
*
* @since 4.1
*/
abstract class DecompressingEntity extends HttpEntityWrapper {
/**
* Default buffer size.
*/
private static final int BUFFER_SIZE = 1024 * 2;
/**
* {@link #getContent()} method must return the same {@link InputStream}
* instance when DecompressingEntity is wrapping a streaming entity.
*/
private InputStream content;
/**
* Creates a new {@link DecompressingEntity}.
*
* @param wrapped
* the non-null {@link HttpEntity} to be wrapped
*/
public DecompressingEntity(final HttpEntity wrapped) {
super(wrapped);
}
abstract InputStream decorate(final InputStream wrapped) throws IOException;
private InputStream getDecompressingStream() throws IOException {
final InputStream in = wrappedEntity.getContent();
return new LazyDecompressingInputStream(in, this);
}
/**
* {@inheritDoc}
*/
@Override
public InputStream getContent() throws IOException {
if (wrappedEntity.isStreaming()) {
if (content == null) {
content = getDecompressingStream();
}
return content;
} else {
return getDecompressingStream();
}
}
/**
* {@inheritDoc}
*/
@Override
public void writeTo(final OutputStream outstream) throws IOException {
Args.notNull(outstream, "Output stream");
final InputStream instream = getContent();
try {
final byte[] buffer = new byte[BUFFER_SIZE];
int l;
while ((l = instream.read(buffer)) != -1) {
outstream.write(buffer, 0, l);
}
} finally {
instream.close();
}
}
}
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