/*
 * 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.
 */
package org.eclipse.aether.transport.apache;

import java.io.Closeable;

import org.apache.http.client.protocol.HttpClientContext;

/**
 * HTTP context that shares certain attributes among requests to optimize the communication with the server.
 *
 * @see <a href="http://hc.apache.org/httpcomponents-client-ga/tutorial/html/advanced.html#stateful_conn">Stateful HTTP
 *      connections</a>
 */
final class SharingHttpContext extends HttpClientContext implements Closeable {

    private final LocalState state;

    private final SharingAuthCache authCache;

    SharingHttpContext(LocalState state) {
        this.state = state;
        authCache = new SharingAuthCache(state);
        super.setAttribute(HttpClientContext.AUTH_CACHE, authCache);
    }

    @Override
    public Object getAttribute(String id) {
        if (HttpClientContext.USER_TOKEN.equals(id)) {
            return state.getUserToken();
        }
        return super.getAttribute(id);
    }

    @Override
    public void setAttribute(String id, Object obj) {
        if (HttpClientContext.USER_TOKEN.equals(id)) {
            state.setUserToken(obj);
        } else {
            super.setAttribute(id, obj);
        }
    }

    @Override
    public Object removeAttribute(String id) {
        if (HttpClientContext.USER_TOKEN.equals(id)) {
            state.setUserToken(null);
            return null;
        }
        return super.removeAttribute(id);
    }

    @Override
    public void close() {
        authCache.clear();
    }
}
