standardsession.java

这是一个法律事务所系统源码

    /**
     * Set the <code>isValid</code> flag for this session.
     *
     * @param isValid The new value for the <code>isValid</code> flag
     */
    void setValid(boolean isValid) {

	this.isValid = isValid;
    }


    // ------------------------------------------------- HttpSession Properties


    /**
     * Return the time when this session was created, in milliseconds since
     * midnight, January 1, 1970 GMT.
     *
     * @exception IllegalStateException if this method is called on an
     *  invalidated session
     */
    public long getCreationTime() {

	if (!isValid())
	    throw new IllegalStateException
		(sm.getString("standardSession.getCreationTime.ise"));

	return (this.creationTime);

    }


    /**
     * Return the session context with which this session is associated.
     *
     * @deprecated As of Version 2.1, this method is deprecated and has no
     *  replacement.  It will be removed in a future version of the
     *  Java Servlet API.
     */
    public HttpSessionContext getSessionContext() {

	if (sessionContext == null)
	    sessionContext = new SessionContextImpl();
	return (sessionContext);

    }


    // ----------------------------------------------HttpSession Public Methods


    /**
     * Return the object bound with the specified name in this session, or
     * <code>null</code> if no object is bound with that name.
     *
     * @param name Name of the attribute to be returned
     *
     * @exception IllegalStateException if this method is called on an
     *  invalidated session
     */
    public Object getAttribute(String name) {

	if (!isValid())
	    throw new IllegalStateException
		(sm.getString("standardSession.getAttribute.ise"));

	return (attributes.get(name));

    }


    /**
     * Return an <code>Enumeration</code> of <code>String</code> objects
     * containing the names of the objects bound to this session.
     *
     * @exception IllegalStateException if this method is called on an
     *  invalidated session
     */
    public Enumeration getAttributeNames() {

	if (!isValid())
	    throw new IllegalStateException
		(sm.getString("standardSession.getAttributeNames.ise"));

	return (attributes.keys());

    }


    /**
     * Return the object bound with the specified name in this session, or
     * <code>null</code> if no object is bound with that name.
     *
     * @param name Name of the value to be returned
     *
     * @exception IllegalStateException if this method is called on an
     *  invalidated session
     *
     * @deprecated As of Version 2.2, this method is replaced by
     *  <code>getAttribute()</code>
     */
    public Object getValue(String name) {

	return (getAttribute(name));

    }


    /**
     * Return the set of names of objects bound to this session.  If there
     * are no such objects, a zero-length array is returned.
     *
     * @exception IllegalStateException if this method is called on an
     *  invalidated session
     *
     * @deprecated As of Version 2.2, this method is replaced by
     *  <code>getAttributeNames()</code>
     */
    public String[] getValueNames() {

	if (!isValid())
	    throw new IllegalStateException
		(sm.getString("standardSession.getValueNames.ise"));

	Vector results = new Vector();
	Enumeration attrs = getAttributeNames();
	while (attrs.hasMoreElements()) {
	    String attr = (String) attrs.nextElement();
	    results.addElement(attr);
	}
	String names[] = new String[results.size()];
	for (int i = 0; i < names.length; i++)
	    names[i] = (String) results.elementAt(i);
	return (names);

    }


    /**
     * Invalidates this session and unbinds any objects bound to it.
     *
     * @exception IllegalStateException if this method is called on
     *  an invalidated session
     */
    public void invalidate() {

	if (!isValid())
	    throw new IllegalStateException
		(sm.getString("standardSession.invalidate.ise"));

	// Cause this session to expire
	expire();

    }


    /**
     * Return <code>true</code> if the client does not yet know about the
     * session, or if the client chooses not to join the session.  For
     * example, if the server used only cookie-based sessions, and the client
     * has disabled the use of cookies, then a session would be new on each
     * request.
     *
     * @exception IllegalStateException if this method is called on an
     *  invalidated session
     */
    public boolean isNew() {

	if (!isValid())
	    throw new IllegalStateException
		(sm.getString("standardSession.isNew.ise"));

	return (this.isNew);

    }


    /**
     * Bind an object to this session, using the specified name.  If an object
     * of the same name is already bound to this session, the object is
     * replaced.
     * <p>
     * After this method executes, and if the object implements
     * <code>HttpSessionBindingListener</code>, the container calls
     * <code>valueBound()</code> on the object.
     *
     * @param name Name to which the object is bound, cannot be null
     * @param value Object to be bound, cannot be null
     *
     * @exception IllegalStateException if this method is called on an
     *  invalidated session
     *
     * @deprecated As of Version 2.2, this method is replaced by
     *  <code>setAttribute()</code>
     */
    public void putValue(String name, Object value) {

	setAttribute(name, value);

    }


    /**
     * Remove the object bound with the specified name from this session.  If
     * the session does not have an object bound with this name, this method
     * does nothing.
     * <p>
     * After this method executes, and if the object implements
     * <code>HttpSessionBindingListener</code>, the container calls
     * <code>valueUnbound()</code> on the object.
     *
     * @param name Name of the object to remove from this session.
     *
     * @exception IllegalStateException if this method is called on an
     *  invalidated session
     */
    public void removeAttribute(String name) {

	if (!isValid())
	    throw new IllegalStateException
		(sm.getString("standardSession.removeAttribute.ise"));

	synchronized (attributes) {
	    Object object = attributes.get(name);
	    if (object == null)
		return;
	    attributes.remove(name);
	    //	    System.out.println( "Removing attribute " + name );
	    if (object instanceof HttpSessionBindingListener) {
		((HttpSessionBindingListener) object).valueUnbound
		    (new HttpSessionBindingEvent((HttpSession) this, name));
	    }
	}

    }


    /**
     * Remove the object bound with the specified name from this session.  If
     * the session does not have an object bound with this name, this method
     * does nothing.
     * <p>
     * After this method executes, and if the object implements
     * <code>HttpSessionBindingListener</code>, the container calls
     * <code>valueUnbound()</code> on the object.
     *
     * @param name Name of the object to remove from this session.
     *
     * @exception IllegalStateException if this method is called on an
     *  invalidated session
     *
     * @deprecated As of Version 2.2, this method is replaced by
     *  <code>removeAttribute()</code>
     */
    public void removeValue(String name) {

	removeAttribute(name);

    }


    /**
     * Bind an object to this session, using the specified name.  If an object
     * of the same name is already bound to this session, the object is
     * replaced.
     * <p>
     * After this method executes, and if the object implements
     * <code>HttpSessionBindingListener</code>, the container calls
     * <code>valueBound()</code> on the object.
     *
     * @param name Name to which the object is bound, cannot be null
     * @param value Object to be bound, cannot be null
     *
     * @exception IllegalArgumentException if an attempt is made to add a
     *  non-serializable object in an environment marked distributable.
     * @exception IllegalStateException if this method is called on an
     *  invalidated session
     */
    public void setAttribute(String name, Object value) {

	if (!isValid())
	    throw new IllegalStateException
		(sm.getString("standardSession.setAttribute.ise"));

	if ((manager != null) && manager.getDistributable() &&
	  !(value instanceof Serializable))
	    throw new IllegalArgumentException
		(sm.getString("standardSession.setAttribute.iae"));

	synchronized (attributes) {
	    removeAttribute(name);
	    attributes.put(name, value);
	    if (value instanceof HttpSessionBindingListener)
		((HttpSessionBindingListener) value).valueBound
		    (new HttpSessionBindingEvent((HttpSession) this, name));
	}

    }


    // -------------------------------------------- HttpSession Private Methods


    /**
     * Read a serialized version of this session object from the specified
     * object input stream.
     * <p>
     * <b>IMPLEMENTATION NOTE</b>:  The reference to the owning Manager
     * is not restored by this method, and must be set explicitly.
     *
     * @param stream The input stream to read from
     *
     * @exception ClassNotFoundException if an unknown class is specified
     * @exception IOException if an input/output error occurs
     */
    private void readObject(ObjectInputStream stream)
		throws ClassNotFoundException, IOException {

		// Deserialize the scalar instance variables (except Manager)
		creationTime = ((Long) stream.readObject()).longValue();
		id = (String) stream.readObject();
		lastAccessedTime = ((Long) stream.readObject()).longValue();
                thisAccessedTime = ((Long) stream.readObject()).longValue();
		maxInactiveInterval = ((Integer) stream.readObject()).intValue();
		isNew = ((Boolean) stream.readObject()).booleanValue();
		isValid = ((Boolean) stream.readObject()).booleanValue();

		attributes = (Hashtable) stream.readObject();
    }


    /**
     * Write a serialized version of this session object to the specified
     * object output stream.
     * <p>
     * <b>IMPLEMENTATION NOTE</b>:  The owning Manager will not be stored
     * in the serialized representation of this Session.  After calling
     * <code>readObject()</code>, you must set the associated Manager
     * explicitly.
     * <p>
     * <b>IMPLEMENTATION NOTE</b>:  Any attribute that is not Serializable
     * will be silently ignored.  If you do not want any such attributes,
     * be sure the <code>distributable</code> property of our associated
     * Manager is set to <code>true</code>. 
	 * <p>
     * <b>IMPLEMENTATION NOTE</b>: If we can't serialize the object stored in 
     * the session, then check to see if it implements 
     * HttpSessionBindingListener and then call its 
     * valueUnbound method, allowing it to save its state
     * correctly instead of just being lost into the etherworld
     *
     * @param stream The output stream to write to
     *
     * @exception IOException if an input/output error occurs
     */
    private void writeObject(ObjectOutputStream stream) throws IOException {

		// Write the scalar instance variables (except Manager)
		stream.writeObject(new Long(creationTime));
		stream.writeObject(id);
		stream.writeObject(new Long(lastAccessedTime));
                stream.writeObject(new Long(thisAccessedTime));
		stream.writeObject(new Integer(maxInactiveInterval));
		stream.writeObject(new Boolean(isNew));
		stream.writeObject(new Boolean(isValid));

        if (attributes.size() > 0) {
			// Accumulate the names of serializable attributes
			Hashtable results = new Hashtable(attributes.size());
        
			for (Enumeration e = attributes.keys(); e.hasMoreElements() ; ) {
				String key = (String) e.nextElement();
				Object value = attributes.get(key);
				if (value instanceof Serializable) {
					results.put(key, value);
				}
				// if we can't serialize the object stored in 
				// the session, then check to see if it implements 
				// HttpSessionBindingListener and then call its 
				// valueUnbound method, allowing it to save its state
				// correctly instead of just being lost into the etherworld
				else if (value instanceof HttpSessionBindingListener ) {
					try {
						((HttpSessionBindingListener)value)
						.valueUnbound(new HttpSessionBindingEvent(this, key));
					} catch (Exception f) {
						// ignored
					}
				}
			}
			stream.writeObject(results);
		} else {
			stream.writeObject(new Hashtable());
		}
	}
}

/**
 * 
 * @author [e-mail]
 */

 class SessionContextImpl implements HttpSessionContext {

    /**
     *
     * @deprecated
     */
    
    public HttpSession getSession(String sessionId) {
        return null;
    }

    /**
     *
     * @deprecated
     */

    public Enumeration getIds() {
        // cheap hack to get an empty enum
        Vector v = new Vector();

        return v.elements();
    }
}