logviewer.java

利用SyncML开发客户端程序的中间件

/*
 * Copyright (C) 2006-2007 Funambol
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package com.funambol.util;

import javax.microedition.rms.RecordEnumeration;
import javax.microedition.rms.RecordStore;
import javax.microedition.rms.RecordStoreException;
import javax.microedition.rms.RecordStoreNotOpenException;

/**
 * A class useful to see the content of Log RecordStore generated by RMSAppender
 *
 */
public class LogViewer {
    
    //---------------------------------------------------------------- Constants
    /**
     * Pass this value to <code>getLogEntries(int mode)</code> method
     * for RMS Log Mode
     */
    public static final int RMSLOG = 0;
    /**
     * Pass this value to <code>getLogEntries(int mode)</code> method
     * for File Log Mode
     */
    public static final int JSR75LOG = 1;
    
    //------------------------------------------------------------- Constructors
    /**
     * Creates a new instance of LogViewer
     */
    public LogViewer() {
    }
    
    //----------------------------------------------------------- Public Methods
    /**
     * This method return a String array that contain the log file content
     * in form of String objects. For now it just can access RMS Log file,
     * but empty method for accessing JSR75 Log file is provided.
     *
     * @return a String array that contain the specified log
     */
    public String[] getLogEntries(int mode) {
        String[] logArray = null;
        if (mode == RMSLOG) {
            logArray = getRMSLogStrings();
        } else if (mode == JSR75LOG) {
            Log.info("JSR75 will be supported in future versions");
        }
        return logArray;
    }
    
    //-----------------------------------------------------------Private Methods
    /**
     * Recursively scan the Log RecordStore RMSAppender.LOGDBNAME
     * and store its content into a String array of String objects.
     *
     * @return result String array that contains all log messages
     */
    private String[] getRMSLogStrings() {
        RecordStore rs = null;
        String[] result = null;
        try {
            rs = RecordStore.openRecordStore(RMSAppender.LOGDBNAME, true);
            int size = rs.getNumRecords();
            if (size == 0) {
                result = new String[1];
                result[0] = "No Log entries found.";
            } else {
                result = recordsToStringArray(rs);
            }
            rs.closeRecordStore();
        } catch (RecordStoreException ex) {
            Log.error(this, "getRMSLogStrings() recordstore Exception");
            ex.printStackTrace();
        }
        return result;
    }
    
    private String[] recordsToStringArray(RecordStore rs) throws RecordStoreNotOpenException {
        int i=0;
        String[] result = new String[rs.getNumRecords()];
        RecordEnumeration re = rs.enumerateRecords(null, null, false);
        while (re.hasNextElement()) {
            try {
                result [i++] = new String(re.nextRecord());
            } catch (Throwable t) {
                Log.error("throwable catched at recordsStoStringArray:  "+ t.toString());
                t.printStackTrace();
            }
        }
        return result;
    }
    
    /**
     * JSR75 Log File viewer. It will be implemented in future versions.
     */
    private void getJsr75LogFile() {
    }
}