/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * particular file as subject to the "Classpath" exception as provided

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 */

package com.sun.corba.se.impl.interceptors;

import com.sun.corba.se.impl.corba.AnyImpl;

import com.sun.corba.se.spi.orb.ORB;

import org.omg.PortableInterceptor.Current;

import org.omg.PortableInterceptor.InvalidSlot;

import org.omg.CORBA.Any;

/**

 * SlotTable is used internally by PICurrent to store the slot information.

 */

public class SlotTable {

    // The vector where all the slot data for the current thread is stored

    private Any[] theSlotData;

    // Required for instantiating Any object.

    private ORB orb;

    // The flag to check whether there are any updates in the current SlotTable.

    // The slots will be reset to null, only if this flag is set.

    private boolean dirtyFlag;

    /**

     * The constructor instantiates an Array of Any[] of size given by slotSize

     * parameter.

     */

    SlotTable( ORB orb, int slotSize ) {

        dirtyFlag = false;

        this.orb = orb;

        theSlotData = new Any[slotSize];

    }

    /**

     * This method sets the slot data at the given slot id (index).

     */

    public void set_slot( int id, Any data ) throws InvalidSlot

    {

        // First check whether the slot is allocated

        // If not, raise the invalid slot exception

        if( id >= theSlotData.length ) {

            throw new InvalidSlot();

        }

        dirtyFlag = true;

        theSlotData[id] = data;

    }

    /**

     * This method get the slot data for the given slot id (index).

     */

    public Any get_slot( int id ) throws InvalidSlot

    {

        // First check whether the slot is allocated

        // If not, raise the invalid slot exception

        if( id >= theSlotData.length ) {

            throw new InvalidSlot();

        }

        if( theSlotData[id] == null ) {

            theSlotData [id] = new AnyImpl(orb);

        }

        return theSlotData[ id ];

    }

    /**

     * This method resets all the slot data to null if dirtyFlag is set.

     */

    void resetSlots( ) {

        if( dirtyFlag == true ) {

            for( int i = 0; i < theSlotData.length; i++ ) {

                theSlotData[i] = null;

            }

        }

    }

    /**

     * This method returns the size of the allocated slots.

     */

    int getSize( ) {

        return theSlotData.length;

    }

}