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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.
 */
package org.apache.shiro.session;

import java.io.Serializable;
import java.util.Collection;
import java.util.Date;

/**
 * Simple Session implementation that immediately delegates all corresponding calls to an
 * underlying proxied session instance.
 * 
 * This class is mostly useful for framework subclassing to intercept certain Session calls
 * and perform additional logic.
 *
 * @since 0.9
 */
public class ProxiedSession implements Session {

    /**
     * The proxied instance
     */
    protected final Session delegate;

    /**
     * Constructs an instance that proxies the specified target.  Subclasses may access this
     * target via the protected final 'delegate' attribute, i.e. this.delegate.
     *
     * @param target the specified target Session to proxy.
     */
    public ProxiedSession(Session target) {
        if (target == null) {
            throw new IllegalArgumentException("Target session to proxy cannot be null.");
        }
        delegate = target;
    }

    /**
     * Immediately delegates to the underlying proxied session.
     */
    public Serializable getId() {
        return delegate.getId();
    }

    /**
     * Immediately delegates to the underlying proxied session.
     */
    public Date getStartTimestamp() {
        return delegate.getStartTimestamp();
    }

    /**
     * Immediately delegates to the underlying proxied session.
     */
    public Date getLastAccessTime() {
        return delegate.getLastAccessTime();
    }

    /**
     * Immediately delegates to the underlying proxied session.
     */
    public long getTimeout() throws InvalidSessionException {
        return delegate.getTimeout();
    }

    /**
     * Immediately delegates to the underlying proxied session.
     */
    public void setTimeout(long maxIdleTimeInMillis) throws InvalidSessionException {
        delegate.setTimeout(maxIdleTimeInMillis);
    }

    /**
     * Immediately delegates to the underlying proxied session.
     */
    public String getHost() {
        return delegate.getHost();
    }

    /**
     * Immediately delegates to the underlying proxied session.
     */
    public void touch() throws InvalidSessionException {
        delegate.touch();
    }

    /**
     * Immediately delegates to the underlying proxied session.
     */
    public void stop() throws InvalidSessionException {
        delegate.stop();
    }

    /**
     * Immediately delegates to the underlying proxied session.
     */
    public Collection