/*

 * Copyright (c) 2007-2008 Nokia Corporation and/or its subsidiary(-ies).

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of the License "Eclipse Public License v1.0"

 * which accompanies this distribution, and is available

 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

 *

 * Initial Contributors:

 * Nokia Corporation - initial contribution.

 *

 * Contributors:

 *

 * Description:  

 *

 */

package com.nokia.maven.scm.provider.hg;

import java.io.File;

import org.apache.maven.scm.ScmException;

import org.apache.maven.scm.ScmFileStatus;

import org.apache.maven.scm.log.ScmLogger;

import org.apache.maven.scm.provider.hg.HgUtils;

import org.apache.maven.scm.provider.hg.command.HgCommandConstants;

import org.apache.maven.scm.provider.hg.command.HgConsumer;

/**

 * Custom version of the HgUtils helper

 * class.

 * It currently implement a fix function

 * to get the current revision 

 * number.

 *

 */

public final class HgUtilsInternal {

    private HgUtilsInternal() {

    }

    public static long getCurrentRevisionNumber(ScmLogger logger, File workingDir)

        throws ScmException {

        String[] revCmd = new String[] { HgCommandConstants.REVNO_CMD };

        HgRevNoConsumer consumer = new HgRevNoConsumer(logger);

        HgUtils.execute(consumer, logger, workingDir, revCmd);

        return consumer.getCurrentRevisionNumber();

    }

    /**

     * Get current (working) revision.

     * <p/>

     * Resolve revision to the last integer found in the command output.

     */

    private static class HgRevNoConsumer extends HgConsumer {

        private long revNo;

        HgRevNoConsumer(ScmLogger logger) {

            super(logger);

        }

        /**

         * {@inheritDoc}

         * Parse the output of the ID command

         * line will be split by space and first parameter

         */

        @Override

        public void doConsume(ScmFileStatus status, String line) {

            String[] elements = line.split("\\s+");

            if (elements.length > 0) {

                // If the clone is modified then the id contains the character '+'

                String strId = elements[0].trim().replace("+", "");

                if (this.getLogger().isDebugEnabled()) {

                    this.getLogger().debug("Parsing: " + strId);

                }

                try {

                    revNo = Long.parseLong(strId, 16);

                } catch (NumberFormatException e) {

                    this.getLogger().error(e);

                }

            }

        }

        long getCurrentRevisionNumber() {

            return revNo;

        }

    }

}