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106 lines
3.2 KiB
106 lines
3.2 KiB
/*
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* ====================================================================
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with 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,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*
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*/
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package org.apache.http.client.entity;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import org.apache.http.HttpEntity;
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import org.apache.http.entity.HttpEntityWrapperHC4;
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import org.apache.http.util.Args;
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/**
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* Common base class for decompressing {@link HttpEntity} implementations.
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*
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* @since 4.1
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*/
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abstract class DecompressingEntity extends HttpEntityWrapperHC4 {
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/**
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* Default buffer size.
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*/
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private static final int BUFFER_SIZE = 1024 * 2;
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/**
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* {@link #getContent()} method must return the same {@link InputStream}
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* instance when DecompressingEntity is wrapping a streaming entity.
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*/
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private InputStream content;
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/**
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* Creates a new {@link DecompressingEntity}.
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*
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* @param wrapped
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* the non-null {@link HttpEntity} to be wrapped
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*/
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public DecompressingEntity(final HttpEntity wrapped) {
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super(wrapped);
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}
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abstract InputStream decorate(final InputStream wrapped) throws IOException;
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private InputStream getDecompressingStream() throws IOException {
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final InputStream in = wrappedEntity.getContent();
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return new LazyDecompressingInputStream(in, this);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public InputStream getContent() throws IOException {
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if (wrappedEntity.isStreaming()) {
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if (content == null) {
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content = getDecompressingStream();
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}
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return content;
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} else {
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return getDecompressingStream();
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}
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public void writeTo(final OutputStream outstream) throws IOException {
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Args.notNull(outstream, "Output stream");
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final InputStream instream = getContent();
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try {
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final byte[] buffer = new byte[BUFFER_SIZE];
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int l;
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while ((l = instream.read(buffer)) != -1) {
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outstream.write(buffer, 0, l);
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}
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} finally {
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instream.close();
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}
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}
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}
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