/*
 *                 Sun Public License Notice
 *
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 *
 * The Original Code is NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2001 Sun
 * Microsystems, Inc. All Rights Reserved.
 */
package org.netbeans.lib.cvsclient.command.watchers;

import java.io.*;

import org.netbeans.lib.cvsclient.*;
import org.netbeans.lib.cvsclient.command.*;
import org.netbeans.lib.cvsclient.connection.*;
import org.netbeans.lib.cvsclient.event.*;
import org.netbeans.lib.cvsclient.request.*;

/**
 * The watchers command looks up who is watching this file,
 * who is interested in it.
 *
 * @author Milos Kleint
 * @author Thomas Singer
 */
public class WatchersCommand extends BasicCommand {
    /**
     * Construct a new watchers command.
     */
    public WatchersCommand() {
        resetCVSCommand();
    }

    /**
     * Creates and returns the WatchersBuilder.
     *
     * @param eventMan the event manager used to receive events.
     */
    public Builder createBuilder(EventManager eventManager) {
        return new WatchersBuilder(eventManager, getLocalDirectory());
    }

    /**
     * Executes this command.
     *
     * @param client the client services object that provides any necessary
     *               services to this command, including the ability to actually
     *               process all the requests
     */
    public void execute(ClientServices client, EventManager eventManager)
            throws CommandException, AuthenticationException {
        client.ensureConnection();

        super.execute(client, eventManager);

        try {
            addRequestForWorkingDirectory(client);
            addArgumentRequests();
            addRequest(CommandRequest.WATCHERS);

            client.processRequests(requests);
        }
        catch (CommandException ex) {
            throw ex;
        }
        catch (Exception ex) {
            throw new CommandException(ex, ex.getLocalizedMessage());
        }
        finally {
            requests.clear();
        }
    }

    /**
     * called when server responses with "ok" or "error", (when the command finishes)
     */
    public void commandTerminated(TerminationEvent e) {
        if (builder != null) {
            builder.outputDone();
        }
    }

    /**
     * This method returns how the command would looklike when typed on the command line.
     * Each command is responsible for constructing this information.
     * @returns  [] files/dirs. Example: checkout -p CvsCommand.java
     */
    public String getCVSCommand() {
        StringBuffer toReturn = new StringBuffer("watchers "); //NOI18N
        toReturn.append(getCVSArguments());
        File[] files = getFiles();
        if (files != null) {
            for (int index = 0; index < files.length; index++) {
                toReturn.append(files[index].getName());
                toReturn.append(' ');
            }
        }
        return toReturn.toString();
    }

    /**
     * takes the arguments and sets the command. To be mainly
     * used for automatic settings (like parsing the .cvsrc file)
     * @return true if the option (switch) was recognized and set
     */
    public boolean setCVSCommand(char opt, String optArg) {
        if (opt == 'R') {
            setRecursive(true);
        }
        else if (opt == 'l') {
            setRecursive(false);
        }
        else {
            return false;
        }
        return true;
    }

    /**
     * String returned by this method defines which options are available for this particular command
     */
    public String getOptString() {
        return "Rl"; //NOI18N
    }

    /**
     * resets all switches in the command. After calling this method,
     * the command should have no switches defined and should behave defaultly.
     */
    public void resetCVSCommand() {
        setRecursive(true);
    }

    /**
     * Returns the arguments of the command in the command-line style.
     * Similar to getCVSCommand() however without the files and command's name
     */
    public String getCVSArguments() {
        StringBuffer toReturn = new StringBuffer();
        if (!isRecursive()) {
            toReturn.append("-l "); //NOI18N
        }
        return toReturn.toString();
    }
}