/*
* This file is part of Flicklib.
*
* Copyright (C) Zsombor Gegesy
*
* Licensed 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.
*/
package com.flicklib.service.cache;
import java.io.IOException;
import java.util.Map;
import com.flicklib.service.Source;
import com.flicklib.service.SourceLoader;
/**
* Source loader which consult with a cache if it's possible before forwarding the request to the internal source loader.
*
* @author zsombor
*
*/
public abstract class HttpCacheSourceLoader implements SourceLoader {
private final SourceLoader resolver;
public HttpCacheSourceLoader(final SourceLoader resolver) {
this.resolver = resolver;
}
@Override
public Source loadSource(String url) throws IOException {
return loadSource(url, true);
}
@Override
public Source loadSource(String url, boolean useCache) throws IOException {
Source source = null;
if (useCache) {
source = getFromCache(url);
}
if (source == null) {
source = resolver.loadSource(url, useCache);
put(url, source);
}
return source;
}
protected abstract Source getFromCache(String url);
protected abstract void put(String url, Source source);
@Override
public Source post(String url, Map<String, String> parameters, Map<String, String> headers) throws IOException {
return resolver.post(url, parameters, headers);
}
}