Merge "DO NOT MERGE Enhance local log." into mnc-dev

    private LinkedList<String> mLog;

    private int mMaxLines;

    private long mNow;

    private final boolean mKeepFirst;

    public LocalLog(int maxLines) {

        mLog = new LinkedList<String>();

        mMaxLines = maxLines;

        mKeepFirst = false;

    }

    public LocalLog(int maxLines, boolean keepFirst) {

        mLog = new LinkedList<String>();

        mMaxLines = maxLines;

        mKeepFirst = keepFirst;

    }

    public synchronized void log(String msg) {

        if (mMaxLines > 0) {

        mNow = System.currentTimeMillis();

        StringBuilder sb = new StringBuilder();

        Calendar c = Calendar.getInstance();

        c.setTimeInMillis(mNow);

        sb.append(String.format("%tm-%td %tH:%tM:%tS.%tL", c, c, c, c, c, c));

            mLog.add(sb.toString() + " - " + msg);

        logStraight(sb.toString() + " - " + msg);

    }

    private synchronized void logStraight(String msg) {

        if (mKeepFirst == false || mLog.size() < mMaxLines) mLog.add(msg);

        if (mMaxLines > 0) {

            while (mLog.size() > mMaxLines) mLog.remove();

        }

    }

    public ReadOnlyLocalLog readOnlyLocalLog() {

        return new ReadOnlyLocalLog(this);

    }

    public synchronized void copyTo(LocalLog other, int lines) {

        int end = mLog.size()-1;

        int begin = end - lines;

        if (begin < 0) begin = 0;

        for (; begin < end; begin++) {

            other.logStraight(mLog.get(begin));

        }

    }

}