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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.impl.client.cache;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Proxy;
import ch.boye.httpclientandroidlib.HttpEntity;
import ch.boye.httpclientandroidlib.HttpRequest;
import ch.boye.httpclientandroidlib.HttpResponse;
import ch.boye.httpclientandroidlib.annotation.NotThreadSafe;
import ch.boye.httpclientandroidlib.client.cache.InputLimit;
import ch.boye.httpclientandroidlib.client.cache.Resource;
import ch.boye.httpclientandroidlib.client.cache.ResourceFactory;
import ch.boye.httpclientandroidlib.client.methods.CloseableHttpResponse;
import ch.boye.httpclientandroidlib.message.BasicHttpResponse;
/**
* @since 4.1
*/
@NotThreadSafe
class SizeLimitedResponseReader {
private final ResourceFactory resourceFactory;
private final long maxResponseSizeBytes;
private final HttpRequest request;
private final CloseableHttpResponse response;
private InputStream instream;
private InputLimit limit;
private Resource resource;
private boolean consumed;
/**
* Create an {@link HttpResponse} that is limited in size, this allows for checking
* the size of objects that will be stored in the cache.
*/
public SizeLimitedResponseReader(
final ResourceFactory resourceFactory,
final long maxResponseSizeBytes,
final HttpRequest request,
final CloseableHttpResponse response) {
super();
this.resourceFactory = resourceFactory;
this.maxResponseSizeBytes = maxResponseSizeBytes;
this.request = request;
this.response = response;
}
protected void readResponse() throws IOException {
if (!consumed) {
doConsume();
}
}
private void ensureNotConsumed() {
if (consumed) {
throw new IllegalStateException("Response has already been consumed");
}
}
private void ensureConsumed() {
if (!consumed) {
throw new IllegalStateException("Response has not been consumed");
}
}
private void doConsume() throws IOException {
ensureNotConsumed();
consumed = true;
limit = new InputLimit(maxResponseSizeBytes);
final HttpEntity entity = response.getEntity();
if (entity == null) {
return;
}
final String uri = request.getRequestLine().getUri();
instream = entity.getContent();
try {
resource = resourceFactory.generate(uri, instream, limit);
} finally {
if (!limit.isReached()) {
instream.close();
}
}
}
boolean isLimitReached() {
ensureConsumed();
return limit.isReached();
}
Resource getResource() {
ensureConsumed();
return resource;
}
CloseableHttpResponse getReconstructedResponse() throws IOException {
ensureConsumed();
final HttpResponse reconstructed = new BasicHttpResponse(response.getStatusLine());
reconstructed.setHeaders(response.getAllHeaders());
final CombinedEntity combinedEntity = new CombinedEntity(resource, instream);
final HttpEntity entity = response.getEntity();
if (entity != null) {
combinedEntity.setContentType(entity.getContentType());
combinedEntity.setContentEncoding(entity.getContentEncoding());
combinedEntity.setChunked(entity.isChunked());
}
reconstructed.setEntity(combinedEntity);
return (CloseableHttpResponse) Proxy.newProxyInstance(
ResponseProxyHandler.class.getClassLoader(),
new Class<?>[] { CloseableHttpResponse.class },
new ResponseProxyHandler(reconstructed) {
@Override
public void close() throws IOException {
response.close();
}
});
}
}
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