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/*
 * Copyright (c) 2008, The Codehaus. All Rights Reserved.
 *
 *   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 org.codehaus.httpcache4j.cache;

import org.codehaus.httpcache4j.HTTPRequest;
import org.codehaus.httpcache4j.HTTPResponse;

import java.net.URI;
import java.util.Iterator;
import java.util.Collections;

/** @author Erlend Hamnaberg */
public class NullCacheStorage implements CacheStorage {
    public HTTPResponse insert(HTTPRequest request, HTTPResponse response) {
        return response;
    }

    public HTTPResponse update(HTTPRequest request, HTTPResponse response) {
        return response;
    }

    public CacheItem get(final HTTPRequest request) {
        return null;
    }

    public CacheItem get(Key key) {
        return null;
    }

    public void invalidate(Key key) {
    }

    public void invalidate(final URI uri) {
    }

    public void clear() {
    }

    public int size() {
        return 0;
    }

    public Iterator iterator() {
        return Collections.emptySet().iterator();
    }

    @Override
    public void shutdown() {
    }
}