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Smack is an Open Source XMPP (Jabber) client library for instant messaging and presence. This library provides the client side functionality as specified in the core XMPP specifications as related to the client side of said specifications.
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/**
 * $RCSfile$
 * $Revision: $
 * $Date: $
 *
 * Copyright 2005-2007 Jive Software.
 *
 * All rights reserved. Licensed 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.jivesoftware.smackx.commands;

import org.jivesoftware.smackx.packet.AdHocCommandData;

/**
 * Represents a command that can be executed locally from a remote location. This
 * class must be extended to implement an specific ad-hoc command. This class
 * provides some useful tools:
 *      Node
 *      Name
 *      Session ID
 *      Current Stage
 *      Available actions
 *      Default action
 * 
 * To implement a new command extend this class and implement all the abstract
 * methods. When implementing the actions remember that they could be invoked
 * several times, and that you must use the current stage number to know what to
 * do.
 * 
 * @author Gabriel Guardincerri
 */
public abstract class LocalCommand extends AdHocCommand {

    /**
     * The time stamp of first invokation of the command. Used to implement the session timeout.
     */
    private long creationDate;

    /**
     * The unique ID of the execution of the command.
     */
    private String sessionID;

    /**
     * The full JID of the host of the command.
     */
    private String ownerJID;

    /**
     * The number of the current stage.
     */
    private int currenStage;

    public LocalCommand() {
        super();
        this.creationDate = System.currentTimeMillis();
        currenStage = -1;
    }

    /**
     * The sessionID is an unique identifier of an execution request. This is
     * automatically handled and should not be called.
     * 
     * @param sessionID the unique session id of this execution
     */
    public void setSessionID(String sessionID) {
        this.sessionID = sessionID;
        getData().setSessionID(sessionID);
    }

    /**
     * Returns the session ID of this execution.
     * 
     * @return the unique session id of this execution
     */
    public String getSessionID() {
        return sessionID;
    }

    /**
     * Sets the JID of the command host. This is automatically handled and should
     * not be called.
     * 
     * @param ownerJID the JID of the owner.
     */
    public void setOwnerJID(String ownerJID) {
        this.ownerJID = ownerJID;
    }

    @Override
    public String getOwnerJID() {
        return ownerJID;
    }

    /**
     * Returns the date the command was created.
     * 
     * @return the date the command was created.
     */
    public long getCreationDate() {
        return creationDate;
    }

    /**
     * Returns true if the current stage is the last one. If it is then the
     * execution of some action will complete the execution of the command.
     * Commands that don't have multiple stages can always return true.
     * 
     * @return true if the command is in the last stage.
     */
    public abstract boolean isLastStage();

    /**
     * Returns true if the specified requester has permission to execute all the
     * stages of this action. This is checked when the first request is received,
     * if the permission is grant then the requester will be able to execute
     * all the stages of the command. It is not checked again during the
     * execution.
     *
     * @param jid the JID to check permissions on.
     * @return true if the user has permission to execute this action.
     */
    public abstract boolean hasPermission(String jid);

    /**
     * Returns the currently executing stage number. The first stage number is
     * 0. During the execution of the first action this method will answer 0.
     *
     * @return the current stage number.
     */
    public int getCurrentStage() {
        return currenStage;
    }

    @Override
    void setData(AdHocCommandData data) {
        data.setSessionID(sessionID);
        super.setData(data);
    }

    /**
     * Increase the current stage number. This is automatically handled and should
     * not be called.
     * 
     */
    void incrementStage() {
        currenStage++;
    }

    /**
     * Decrease the current stage number. This is automatically handled and should
     * not be called.
     * 
     */
    void decrementStage() {
        currenStage--;
    }
}