http/base/src/main/java/org/apache/felix/http/base/internal/handler/HttpSessionWrapper.java - felix - Git at Google

 /*
  * 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.felix.http.base.internal.handler;

 import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.Enumeration;
 import java.util.HashSet;
 import java.util.List;
 import java.util.NoSuchElementException;
 import java.util.Set;

 import javax.servlet.ServletContext;
 import javax.servlet.http.HttpSession;
 import javax.servlet.http.HttpSessionBindingEvent;
 import javax.servlet.http.HttpSessionBindingListener;
 import javax.servlet.http.HttpSessionContext;
 import javax.servlet.http.HttpSessionEvent;

 import org.apache.felix.http.base.internal.HttpConfig;
 import org.apache.felix.http.base.internal.context.ExtServletContext;

 /**
  * The session wrapper keeps track of the internal session, manages their attributes
  * separately and also handles session timeout.
  */
 @SuppressWarnings("deprecation")
 public class HttpSessionWrapper implements HttpSession
 {
     /** All special attributes are prefixed with this prefix. */
     private static final String PREFIX = "org.apache.felix.http.session.context.";

     /** For each internal session, the attributes are prefixed with this followed by the context id */
     private static final String ATTR_PREFIX = PREFIX + "attr.";

     /** The created time for the internal session (appended with context id) */
     private static final String ATTR_CREATED = PREFIX + "created.";

     /** The last accessed time for the internal session (appended with context id), as Epoch time (milliseconds). */
     private static final String ATTR_LAST_ACCESSED = PREFIX + "lastaccessed.";

     /** The max inactive time (appended with context id), in seconds. */
     private static final String ATTR_MAX_INACTIVE = PREFIX + "maxinactive.";

     /** The underlying container session. */
     private final HttpSession delegate;

     /** The corresponding servlet context. */
     private final ExtServletContext context;

     /** The id for this session. */
     private final String sessionId;

     /** The key prefix for attributes belonging to this session. */
     private final String keyPrefix;

     /** Flag to handle the validity of this session. */
     private volatile boolean isInvalid = false;

     /** The time this has been created. */
     private final long created;

     /** The time this has been last accessed. */
     private final long lastAccessed;

     /** The max timeout interval. */
     private int maxTimeout;

     /**
      * Is this a new session?
      */
     private final boolean isNew;

     /**
      * Session handling configuration
      */
     private final HttpConfig config;


     public static boolean hasSession(final String contextName, final HttpSession session)
     {
         return session.getAttribute(ATTR_CREATED.concat(contextName)) != null;
     }

     public static Set<String> getExpiredSessionContextNames(final HttpSession session)
     {
         final long now = System.currentTimeMillis();

         final Set<String> names = new HashSet<>();
         final Enumeration<String> attrNames = session.getAttributeNames();
         while (attrNames.hasMoreElements())
         {
             final String name = attrNames.nextElement();
             if (name.startsWith(ATTR_LAST_ACCESSED))
             {
                 final String id = name.substring(ATTR_LAST_ACCESSED.length());

                 final long lastAccess = (Long) session.getAttribute(name);
                 final long maxTimeout = 1000L * ((Integer) session.getAttribute(ATTR_MAX_INACTIVE + id));

                 if ((maxTimeout > 0) && (lastAccess + maxTimeout) < now)
                 {
                     names.add(id);
                 }
             }
         }
         return names;
     }

     /**
      * Get the names of all contexts using a session.
      * @param session The underlying session
      * @return The set of names
      */
     public static Set<String> getSessionContextNames(final HttpSession session)
     {
         final Set<String> names = new HashSet<>();
         final Enumeration<String> attrNames = session.getAttributeNames();
         while (attrNames.hasMoreElements())
         {
             final String name = attrNames.nextElement();
             if (name.startsWith(ATTR_LAST_ACCESSED))
             {
                 final String id = name.substring(ATTR_LAST_ACCESSED.length());
                 names.add(id);
             }
         }

         return names;
     }

     /**
      * Creates a new {@link HttpSessionWrapper} instance.
      */
     public HttpSessionWrapper(final HttpSession session,
             final ExtServletContext context,
             final HttpConfig config,
             final boolean terminate)
     {
         this.config = config;
         this.delegate = session;
         this.context = context;
         this.sessionId = context.getServletContextName();
         this.keyPrefix = ATTR_PREFIX.concat(this.sessionId).concat(".");

         final String createdAttrName = ATTR_CREATED.concat(this.sessionId);

         final long now = System.currentTimeMillis();
         if ( session.getAttribute(createdAttrName) == null )
         {
             this.created = now;
             this.maxTimeout = session.getMaxInactiveInterval();
             this.isNew = true;

             session.setAttribute(createdAttrName, this.created);
             session.setAttribute(ATTR_MAX_INACTIVE.concat(this.sessionId), this.maxTimeout);

             context.getHttpSessionListener().sessionCreated(new HttpSessionEvent(this));
         }
         else
         {
             this.created = (Long)session.getAttribute(createdAttrName);
             this.maxTimeout = (Integer)session.getAttribute(ATTR_MAX_INACTIVE.concat(this.sessionId));
             this.isNew = false;
         }

         this.lastAccessed = now;
         if ( !terminate )
         {
             session.setAttribute(ATTR_LAST_ACCESSED.concat(this.sessionId), this.lastAccessed);
         }
     }

     /**
      * Helper method to get the real key within the real session.
      */
     private String getKey(final String name)
     {
         return this.keyPrefix.concat(name);
     }

     /**
      * Check whether this session is still valid.
      * @throws IllegalStateException if session is not valid anymore
      */
     private void checkInvalid()
     {
         if ( this.isInvalid )
         {
             throw new IllegalStateException("Session is invalid.");
         }
     }

     @Override
     public Object getAttribute(final String name)
     {
         this.checkInvalid();
         Object result = this.delegate.getAttribute(this.getKey(name));
         if ( result instanceof SessionBindingValueListenerWrapper )
         {
             result = ((SessionBindingValueListenerWrapper)result).getHttpSessionBindingListener();
         }
         return result;
     }

     @Override
     public Enumeration<String> getAttributeNames()
     {
         this.checkInvalid();
         final Enumeration<String> e = this.delegate.getAttributeNames();
         return new Enumeration<String>() {

             String next = peek();

             private String peek()
             {
                 while ( e.hasMoreElements() )
                 {
                     final String name = e.nextElement();
                     if ( name.startsWith(keyPrefix))
                     {
                         return name.substring(keyPrefix.length());
                     }
                 }
                 return null;
             }

             @Override
             public boolean hasMoreElements() {
                 return next != null;
             }

             @Override
             public String nextElement() {
                 if ( next == null )
                 {
                     throw new NoSuchElementException();
                 }
                 final String result = next;
                 next = this.peek();
                 return result;
             }
         };

     }

     @Override
     public long getCreationTime()
     {
         this.checkInvalid();
         return this.created;
     }

     @Override
     public String getId()
     {
         this.checkInvalid();
         if ( this.config.isUniqueSessionId() )
         {
             return this.delegate.getId().concat("-").concat(this.sessionId);
         }
         return this.delegate.getId();
     }

     @Override
     public long getLastAccessedTime()
     {
         this.checkInvalid();
         return this.lastAccessed;
     }

     @Override
     public int getMaxInactiveInterval()
     {
         // no validity check conforming to the javadocs
         return this.maxTimeout;
     }

     @Override
     public ServletContext getServletContext()
     {
         // no validity check conforming to the javadocs
         return this.context;
     }

     @Override
     public Object getValue(String name)
     {
         return this.getAttribute(name);
     }

     @Override
     public String[] getValueNames()
     {
         final List<String> names = new ArrayList<>();
         final Enumeration<String> e = this.getAttributeNames();
         while ( e.hasMoreElements() )
         {
             names.add(e.nextElement());
         }
         return names.toArray(new String[names.size()]);
     }

     @Override
     public void invalidate()
     {
         this.checkInvalid();

         // session listener must be called before the session is invalidated
         context.getHttpSessionListener().sessionDestroyed(new HttpSessionEvent(this));

         this.delegate.removeAttribute(ATTR_CREATED + this.sessionId);
         this.delegate.removeAttribute(ATTR_LAST_ACCESSED + this.sessionId);
         this.delegate.removeAttribute(ATTR_MAX_INACTIVE + this.sessionId);

         // remove all attributes belonging to this session
         final Enumeration<String> names = this.delegate.getAttributeNames();
         while ( names.hasMoreElements() )
         {
             final String name = names.nextElement();

             if ( name.startsWith(this.keyPrefix) ) {
                 this.removeAttribute(name.substring(this.keyPrefix.length()));
             }
         }

         if ( this.config.isInvalidateContainerSession() )
         {
             // if the session is empty we can invalidate
             final Enumeration<String> remainingNames = this.delegate.getAttributeNames();
             if ( !remainingNames.hasMoreElements() )
             {
                 this.delegate.invalidate();
             }
         }

         this.isInvalid = true;
     }

     @Override
     public boolean isNew()
     {
         this.checkInvalid();
         return this.isNew;
     }

     @Override
     public void putValue(final String name, final Object value)
     {
         this.setAttribute(name, value);
     }

     @Override
     public void removeAttribute(final String name)
     {
         this.checkInvalid();
         final Object oldValue = this.getAttribute(name);
         if ( oldValue != null )
         {
             this.delegate.removeAttribute(this.getKey(name));
             if ( oldValue instanceof HttpSessionBindingListener )
             {
                 ((HttpSessionBindingListener)oldValue).valueUnbound(new HttpSessionBindingEvent(this, name));
             }
             if ( this.context.getHttpSessionAttributeListener() != null )
             {
                 this.context.getHttpSessionAttributeListener().attributeRemoved(new HttpSessionBindingEvent(this, name, oldValue));
             }
         }
     }

     @Override
     public void removeValue(final String name)
     {
         this.removeAttribute(name);
     }

     @Override
     public void setAttribute(final String name, final Object value)
     {
         this.checkInvalid();
         if ( value == null )
         {
             this.removeAttribute(name);
             return;
         }

         final Object oldValue = this.getAttribute(name);
         // wrap http session binding listener to avoid container calling it!
         if ( value instanceof HttpSessionBindingListener )
         {
             this.delegate.setAttribute(this.getKey(name),
                     new SessionBindingValueListenerWrapper((HttpSessionBindingListener)value));
         }
         else
         {
             this.delegate.setAttribute(this.getKey(name), value);
         }
         if ( value instanceof HttpSessionBindingListener )
         {
             ((HttpSessionBindingListener)value).valueBound(new HttpSessionBindingEvent(this, name));
         }

         if ( this.context.getHttpSessionAttributeListener() != null )
         {
             if ( oldValue != null )
             {
                 this.context.getHttpSessionAttributeListener().attributeReplaced(new HttpSessionBindingEvent(this, name, oldValue));
             }
             else
             {
                 this.context.getHttpSessionAttributeListener().attributeAdded(new HttpSessionBindingEvent(this, name, value));
             }
         }
     }

     @Override
     public void setMaxInactiveInterval(final int interval)
     {
         if ( this.delegate.getMaxInactiveInterval() < interval )
         {
             this.delegate.setMaxInactiveInterval(interval);
         }
         this.maxTimeout = interval;
         this.delegate.setAttribute(ATTR_MAX_INACTIVE + this.sessionId, interval);
     }

     @Override
     public HttpSessionContext getSessionContext()
     {
         // no need to check validity conforming to the javadoc
         return this.delegate.getSessionContext();
     }

     private static final class SessionBindingValueListenerWrapper implements Serializable
     {

         private static final long serialVersionUID = 4009563108883768425L;

         private final HttpSessionBindingListener listener;

         public SessionBindingValueListenerWrapper(final HttpSessionBindingListener listener)
         {
             this.listener = listener;
         }

         public HttpSessionBindingListener getHttpSessionBindingListener()
         {
             return listener;
         }
     }

     @Override
     public int hashCode()
     {
         return this.getId().concat(this.sessionId).hashCode();
     }

     @Override
     public boolean equals(final Object obj)
     {
         if (this == obj)
         {
             return true;
         }
         if (obj == null || this.getClass() != obj.getClass() )
         {
             return false;
         }
         final HttpSessionWrapper other = (HttpSessionWrapper) obj;
         return other.getId().concat(other.sessionId).equals(this.getId().concat(this.sessionId));
     }
 }
	/*
	* 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.felix.http.base.internal.handler;

	import java.io.Serializable;
	import java.util.ArrayList;
	import java.util.Enumeration;
	import java.util.HashSet;
	import java.util.List;
	import java.util.NoSuchElementException;
	import java.util.Set;

	import javax.servlet.ServletContext;
	import javax.servlet.http.HttpSession;
	import javax.servlet.http.HttpSessionBindingEvent;
	import javax.servlet.http.HttpSessionBindingListener;
	import javax.servlet.http.HttpSessionContext;
	import javax.servlet.http.HttpSessionEvent;

	import org.apache.felix.http.base.internal.HttpConfig;
	import org.apache.felix.http.base.internal.context.ExtServletContext;

	/**
	* The session wrapper keeps track of the internal session, manages their attributes
	* separately and also handles session timeout.
	*/
	@SuppressWarnings("deprecation")
	public class HttpSessionWrapper implements HttpSession
	{
	/** All special attributes are prefixed with this prefix. */
	private static final String PREFIX = "org.apache.felix.http.session.context.";

	/** For each internal session, the attributes are prefixed with this followed by the context id */
	private static final String ATTR_PREFIX = PREFIX + "attr.";

	/** The created time for the internal session (appended with context id) */
	private static final String ATTR_CREATED = PREFIX + "created.";

	/** The last accessed time for the internal session (appended with context id), as Epoch time (milliseconds). */
	private static final String ATTR_LAST_ACCESSED = PREFIX + "lastaccessed.";

	/** The max inactive time (appended with context id), in seconds. */
	private static final String ATTR_MAX_INACTIVE = PREFIX + "maxinactive.";

	/** The underlying container session. */
	private final HttpSession delegate;

	/** The corresponding servlet context. */
	private final ExtServletContext context;

	/** The id for this session. */
	private final String sessionId;

	/** The key prefix for attributes belonging to this session. */
	private final String keyPrefix;

	/** Flag to handle the validity of this session. */
	private volatile boolean isInvalid = false;

	/** The time this has been created. */
	private final long created;

	/** The time this has been last accessed. */
	private final long lastAccessed;

	/** The max timeout interval. */
	private int maxTimeout;

	/**
	* Is this a new session?
	*/
	private final boolean isNew;

	/**
	* Session handling configuration
	*/
	private final HttpConfig config;



	public static boolean hasSession(final String contextName, final HttpSession session)
	{
	return session.getAttribute(ATTR_CREATED.concat(contextName)) != null;
	}

	public static Set<String> getExpiredSessionContextNames(final HttpSession session)
	{
	final long now = System.currentTimeMillis();

	final Set<String> names = new HashSet<>();
	final Enumeration<String> attrNames = session.getAttributeNames();
	while (attrNames.hasMoreElements())
	{
	final String name = attrNames.nextElement();
	if (name.startsWith(ATTR_LAST_ACCESSED))
	{
	final String id = name.substring(ATTR_LAST_ACCESSED.length());

	final long lastAccess = (Long) session.getAttribute(name);
	final long maxTimeout = 1000L * ((Integer) session.getAttribute(ATTR_MAX_INACTIVE + id));

	if ((maxTimeout > 0) && (lastAccess + maxTimeout) < now)
	{
	names.add(id);
	}
	}
	}
	return names;
	}

	/**
	* Get the names of all contexts using a session.
	* @param session The underlying session
	* @return The set of names
	*/
	public static Set<String> getSessionContextNames(final HttpSession session)
	{
	final Set<String> names = new HashSet<>();
	final Enumeration<String> attrNames = session.getAttributeNames();
	while (attrNames.hasMoreElements())
	{
	final String name = attrNames.nextElement();
	if (name.startsWith(ATTR_LAST_ACCESSED))
	{
	final String id = name.substring(ATTR_LAST_ACCESSED.length());
	names.add(id);
	}
	}

	return names;
	}

	/**
	* Creates a new {@link HttpSessionWrapper} instance.
	*/
	public HttpSessionWrapper(final HttpSession session,
	final ExtServletContext context,
	final HttpConfig config,
	final boolean terminate)
	{
	this.config = config;
	this.delegate = session;
	this.context = context;
	this.sessionId = context.getServletContextName();
	this.keyPrefix = ATTR_PREFIX.concat(this.sessionId).concat(".");

	final String createdAttrName = ATTR_CREATED.concat(this.sessionId);

	final long now = System.currentTimeMillis();
	if ( session.getAttribute(createdAttrName) == null )
	{
	this.created = now;
	this.maxTimeout = session.getMaxInactiveInterval();
	this.isNew = true;

	session.setAttribute(createdAttrName, this.created);
	session.setAttribute(ATTR_MAX_INACTIVE.concat(this.sessionId), this.maxTimeout);

	context.getHttpSessionListener().sessionCreated(new HttpSessionEvent(this));
	}
	else
	{
	this.created = (Long)session.getAttribute(createdAttrName);
	this.maxTimeout = (Integer)session.getAttribute(ATTR_MAX_INACTIVE.concat(this.sessionId));
	this.isNew = false;
	}

	this.lastAccessed = now;
	if ( !terminate )
	{
	session.setAttribute(ATTR_LAST_ACCESSED.concat(this.sessionId), this.lastAccessed);
	}
	}

	/**
	* Helper method to get the real key within the real session.
	*/
	private String getKey(final String name)
	{
	return this.keyPrefix.concat(name);
	}

	/**
	* Check whether this session is still valid.
	* @throws IllegalStateException if session is not valid anymore
	*/
	private void checkInvalid()
	{
	if ( this.isInvalid )
	{
	throw new IllegalStateException("Session is invalid.");
	}
	}

	@Override
	public Object getAttribute(final String name)
	{
	this.checkInvalid();
	Object result = this.delegate.getAttribute(this.getKey(name));
	if ( result instanceof SessionBindingValueListenerWrapper )
	{
	result = ((SessionBindingValueListenerWrapper)result).getHttpSessionBindingListener();
	}
	return result;
	}

	@Override
	public Enumeration<String> getAttributeNames()
	{
	this.checkInvalid();
	final Enumeration<String> e = this.delegate.getAttributeNames();
	return new Enumeration<String>() {

	String next = peek();

	private String peek()
	{
	while ( e.hasMoreElements() )
	{
	final String name = e.nextElement();
	if ( name.startsWith(keyPrefix))
	{
	return name.substring(keyPrefix.length());
	}
	}
	return null;
	}

	@Override
	public boolean hasMoreElements() {
	return next != null;
	}

	@Override
	public String nextElement() {
	if ( next == null )
	{
	throw new NoSuchElementException();
	}
	final String result = next;
	next = this.peek();
	return result;
	}
	};

	}

	@Override
	public long getCreationTime()
	{
	this.checkInvalid();
	return this.created;
	}

	@Override
	public String getId()
	{
	this.checkInvalid();
	if ( this.config.isUniqueSessionId() )
	{
	return this.delegate.getId().concat("-").concat(this.sessionId);
	}
	return this.delegate.getId();
	}

	@Override
	public long getLastAccessedTime()
	{
	this.checkInvalid();
	return this.lastAccessed;
	}

	@Override
	public int getMaxInactiveInterval()
	{
	// no validity check conforming to the javadocs
	return this.maxTimeout;
	}

	@Override
	public ServletContext getServletContext()
	{
	// no validity check conforming to the javadocs
	return this.context;
	}

	@Override
	public Object getValue(String name)
	{
	return this.getAttribute(name);
	}

	@Override
	public String[] getValueNames()
	{
	final List<String> names = new ArrayList<>();
	final Enumeration<String> e = this.getAttributeNames();
	while ( e.hasMoreElements() )
	{
	names.add(e.nextElement());
	}
	return names.toArray(new String[names.size()]);
	}

	@Override
	public void invalidate()
	{
	this.checkInvalid();

	// session listener must be called before the session is invalidated
	context.getHttpSessionListener().sessionDestroyed(new HttpSessionEvent(this));

	this.delegate.removeAttribute(ATTR_CREATED + this.sessionId);
	this.delegate.removeAttribute(ATTR_LAST_ACCESSED + this.sessionId);
	this.delegate.removeAttribute(ATTR_MAX_INACTIVE + this.sessionId);

	// remove all attributes belonging to this session
	final Enumeration<String> names = this.delegate.getAttributeNames();
	while ( names.hasMoreElements() )
	{
	final String name = names.nextElement();

	if ( name.startsWith(this.keyPrefix) ) {
	this.removeAttribute(name.substring(this.keyPrefix.length()));
	}
	}

	if ( this.config.isInvalidateContainerSession() )
	{
	// if the session is empty we can invalidate
	final Enumeration<String> remainingNames = this.delegate.getAttributeNames();
	if ( !remainingNames.hasMoreElements() )
	{
	this.delegate.invalidate();
	}
	}

	this.isInvalid = true;
	}

	@Override
	public boolean isNew()
	{
	this.checkInvalid();
	return this.isNew;
	}

	@Override
	public void putValue(final String name, final Object value)
	{
	this.setAttribute(name, value);
	}

	@Override
	public void removeAttribute(final String name)
	{
	this.checkInvalid();
	final Object oldValue = this.getAttribute(name);
	if ( oldValue != null )
	{
	this.delegate.removeAttribute(this.getKey(name));
	if ( oldValue instanceof HttpSessionBindingListener )
	{
	((HttpSessionBindingListener)oldValue).valueUnbound(new HttpSessionBindingEvent(this, name));
	}
	if ( this.context.getHttpSessionAttributeListener() != null )
	{
	this.context.getHttpSessionAttributeListener().attributeRemoved(new HttpSessionBindingEvent(this, name, oldValue));
	}
	}
	}

	@Override
	public void removeValue(final String name)
	{
	this.removeAttribute(name);
	}

	@Override
	public void setAttribute(final String name, final Object value)
	{
	this.checkInvalid();
	if ( value == null )
	{
	this.removeAttribute(name);
	return;
	}

	final Object oldValue = this.getAttribute(name);
	// wrap http session binding listener to avoid container calling it!
	if ( value instanceof HttpSessionBindingListener )
	{
	this.delegate.setAttribute(this.getKey(name),
	new SessionBindingValueListenerWrapper((HttpSessionBindingListener)value));
	}
	else
	{
	this.delegate.setAttribute(this.getKey(name), value);
	}
	if ( value instanceof HttpSessionBindingListener )
	{
	((HttpSessionBindingListener)value).valueBound(new HttpSessionBindingEvent(this, name));
	}

	if ( this.context.getHttpSessionAttributeListener() != null )
	{
	if ( oldValue != null )
	{
	this.context.getHttpSessionAttributeListener().attributeReplaced(new HttpSessionBindingEvent(this, name, oldValue));
	}
	else
	{
	this.context.getHttpSessionAttributeListener().attributeAdded(new HttpSessionBindingEvent(this, name, value));
	}
	}
	}

	@Override
	public void setMaxInactiveInterval(final int interval)
	{
	if ( this.delegate.getMaxInactiveInterval() < interval )
	{
	this.delegate.setMaxInactiveInterval(interval);
	}
	this.maxTimeout = interval;
	this.delegate.setAttribute(ATTR_MAX_INACTIVE + this.sessionId, interval);
	}

	@Override
	public HttpSessionContext getSessionContext()
	{
	// no need to check validity conforming to the javadoc
	return this.delegate.getSessionContext();
	}

	private static final class SessionBindingValueListenerWrapper implements Serializable
	{

	private static final long serialVersionUID = 4009563108883768425L;

	private final HttpSessionBindingListener listener;

	public SessionBindingValueListenerWrapper(final HttpSessionBindingListener listener)
	{
	this.listener = listener;
	}

	public HttpSessionBindingListener getHttpSessionBindingListener()
	{
	return listener;
	}
	}

	@Override
	public int hashCode()
	{
	return this.getId().concat(this.sessionId).hashCode();
	}

	@Override
	public boolean equals(final Object obj)
	{
	if (this == obj)
	{
	return true;
	}
	if (obj == null \|\| this.getClass() != obj.getClass() )
	{
	return false;
	}
	final HttpSessionWrapper other = (HttpSessionWrapper) obj;
	return other.getId().concat(other.sessionId).equals(this.getId().concat(this.sessionId));
	}
	}