/*
* ====================================================================
*
* 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 com.fanfou.app.opensource.http.support;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.http.HttpEntity;
import org.apache.http.entity.HttpEntityWrapper;
/**
* 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;
/**
* DecompressingEntities are not repeatable, so they will return the same
* InputStream instance when {@link #getContent()} is called.
*/
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);
}
/**
* {@inheritDoc}
*/
@Override
public InputStream getContent() throws IOException {
if (this.wrappedEntity.isStreaming()) {
if (this.content == null) {
this.content = getDecompressingInputStream(this.wrappedEntity
.getContent());
}
return this.content;
} else {
return getDecompressingInputStream(this.wrappedEntity.getContent());
}
}
abstract InputStream getDecompressingInputStream(final InputStream wrapped)
throws IOException;
/**
* {@inheritDoc}
*/
@Override
public void writeTo(final OutputStream outstream) throws IOException {
if (outstream == null) {
throw new IllegalArgumentException("Output stream may not be null");
}
final InputStream instream = getContent();
try {
final byte[] buffer = new byte[DecompressingEntity.BUFFER_SIZE];
int l;
while ((l = instream.read(buffer)) != -1) {
outstream.write(buffer, 0, l);
}
} finally {
instream.close();
}
}
}