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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 ch.boye.httpclientandroidlib.androidextra.HttpClientAndroidLog;
/* LogFactory removed by HttpClient for Android script. */
import ch.boye.httpclientandroidlib.Header;
import ch.boye.httpclientandroidlib.HeaderElement;
import ch.boye.httpclientandroidlib.HttpRequest;
import ch.boye.httpclientandroidlib.HttpVersion;
import ch.boye.httpclientandroidlib.ProtocolVersion;
import ch.boye.httpclientandroidlib.annotation.Immutable;
import ch.boye.httpclientandroidlib.client.cache.HeaderConstants;
/**
* Determines if an HttpRequest is allowed to be served from the cache.
*
* @since 4.1
*/
@Immutable
class CacheableRequestPolicy {
public HttpClientAndroidLog log = new HttpClientAndroidLog(getClass());
/**
* Determines if an HttpRequest can be served from the cache.
*
* @param request
* an HttpRequest
* @return boolean Is it possible to serve this request from cache
*/
public boolean isServableFromCache(final HttpRequest request) {
final String method = request.getRequestLine().getMethod();
final ProtocolVersion pv = request.getRequestLine().getProtocolVersion();
if (HttpVersion.HTTP_1_1.compareToVersion(pv) != 0) {
log.trace("non-HTTP/1.1 request was not serveable from cache");
return false;
}
if (!method.equals(HeaderConstants.GET_METHOD)) {
log.trace("non-GET request was not serveable from cache");
return false;
}
if (request.getHeaders(HeaderConstants.PRAGMA).length > 0) {
log.trace("request with Pragma header was not serveable from cache");
return false;
}
final Header[] cacheControlHeaders = request.getHeaders(HeaderConstants.CACHE_CONTROL);
for (final Header cacheControl : cacheControlHeaders) {
for (final HeaderElement cacheControlElement : cacheControl.getElements()) {
if (HeaderConstants.CACHE_CONTROL_NO_STORE.equalsIgnoreCase(cacheControlElement
.getName())) {
log.trace("Request with no-store was not serveable from cache");
return false;
}
if (HeaderConstants.CACHE_CONTROL_NO_CACHE.equalsIgnoreCase(cacheControlElement
.getName())) {
log.trace("Request with no-cache was not serveable from cache");
return false;
}
}
}
log.trace("Request was serveable from cache");
return true;
}
}
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