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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
 * .
 *
 */
package org.apache.http.impl.conn;

import java.io.IOException;

import org.apache.http.HttpHost;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.OperatedClientConnection;
import org.apache.http.conn.routing.HttpRoute;
import org.apache.http.params.HttpParams;
import org.apache.http.protocol.HttpContext;

/**
 * Abstract adapter from pool {@link AbstractPoolEntry entries} to
 * {@link org.apache.http.conn.ManagedClientConnection managed}
 * client connections.
 * The connection in the pool entry is used to initialize the base class.
 * In addition, methods to establish a route are delegated to the
 * pool entry. {@link #shutdown shutdown} and {@link #close close}
 * will clear the tracked route in the pool entry and call the
 * respective method of the wrapped connection.
 *
 * @since 4.0
 *
 * @deprecated (4.2)  do not use
 */
@Deprecated
public abstract class AbstractPooledConnAdapter extends AbstractClientConnAdapter {

    /** The wrapped pool entry. */
    protected volatile AbstractPoolEntry poolEntry;

    /**
     * Creates a new connection adapter.
     *
     * @param manager   the connection manager
     * @param entry     the pool entry for the connection being wrapped
     */
    protected AbstractPooledConnAdapter(final ClientConnectionManager manager,
                                        final AbstractPoolEntry entry) {
        super(manager, entry.connection);
        this.poolEntry = entry;
    }

    @Override
    public String getId() {
        return null;
    }

    /**
     * Obtains the pool entry.
     *
     * @return  the pool entry, or {@code null} if detached
     *
     * @deprecated (4.0.1)
     */
    @Deprecated
    protected AbstractPoolEntry getPoolEntry() {
        return this.poolEntry;
    }

    /**
     * Asserts that there is a valid pool entry.
     *
     * @throws ConnectionShutdownException if there is no pool entry
     *                                  or connection has been aborted
     *
     * @see #assertValid(OperatedClientConnection)
     */
    protected void assertValid(final AbstractPoolEntry entry) {
        if (isReleased() || entry == null) {
            throw new ConnectionShutdownException();
        }
    }

    /**
     * @deprecated (4.1)  use {@link #assertValid(AbstractPoolEntry)}
     */
    @Deprecated
    protected final void assertAttached() {
        if (poolEntry == null) {
            throw new ConnectionShutdownException();
        }
    }

    /**
     * Detaches this adapter from the wrapped connection.
     * This adapter becomes useless.
     */
    @Override
    protected synchronized void detach() {
        poolEntry = null;
        super.detach();
    }

    @Override
    public HttpRoute getRoute() {
        final AbstractPoolEntry entry = getPoolEntry();
        assertValid(entry);
        return (entry.tracker == null) ? null : entry.tracker.toRoute();
    }

    @Override
    public void open(final HttpRoute route,
                     final HttpContext context, final HttpParams params)
        throws IOException {
        final AbstractPoolEntry entry = getPoolEntry();
        assertValid(entry);
        entry.open(route, context, params);
    }

    @Override
    public void tunnelTarget(final boolean secure, final HttpParams params)
        throws IOException {
        final AbstractPoolEntry entry = getPoolEntry();
        assertValid(entry);
        entry.tunnelTarget(secure, params);
    }

    @Override
    public void tunnelProxy(final HttpHost next, final boolean secure, final HttpParams params)
        throws IOException {
        final AbstractPoolEntry entry = getPoolEntry();
        assertValid(entry);
        entry.tunnelProxy(next, secure, params);
    }

    @Override
    public void layerProtocol(final HttpContext context, final HttpParams params)
        throws IOException {
        final AbstractPoolEntry entry = getPoolEntry();
        assertValid(entry);
        entry.layerProtocol(context, params);
    }

    @Override
    public void close() throws IOException {
        final AbstractPoolEntry entry = getPoolEntry();
        if (entry != null) {
            entry.shutdownEntry();
        }

        final OperatedClientConnection conn = getWrappedConnection();
        if (conn != null) {
            conn.close();
        }
    }

    @Override
    public void shutdown() throws IOException {
        final AbstractPoolEntry entry = getPoolEntry();
        if (entry != null) {
            entry.shutdownEntry();
        }

        final OperatedClientConnection conn = getWrappedConnection();
        if (conn != null) {
            conn.shutdown();
        }
    }

    @Override
    public Object getState() {
        final AbstractPoolEntry entry = getPoolEntry();
        assertValid(entry);
        return entry.getState();
    }

    @Override
    public void setState(final Object state) {
        final AbstractPoolEntry entry = getPoolEntry();
        assertValid(entry);
        entry.setState(state);
    }

}