org.syncany.cli.util.CarriageReturnPrinter.java Source code

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Here is the source code for org.syncany.cli.util.CarriageReturnPrinter.java

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/*
 * Syncany, www.syncany.org
 * Copyright (C) 2011-2015 Philipp C. Heckel <philipp.heckel@gmail.com> 
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */
package org.syncany.cli.util;

import java.io.PrintStream;

import com.google.common.base.Strings;

public class CarriageReturnPrinter {
    private PrintStream underlyingPrintStream;
    private int lineLength;
    private boolean lastWasWithCarriageReturn;

    public CarriageReturnPrinter(PrintStream underlyingPrintStream) {
        this.underlyingPrintStream = underlyingPrintStream;
        this.lineLength = 0;
        this.lastWasWithCarriageReturn = false;
    }

    public void printf(String format, Object... args) {
        clearLastLine();

        String line = String.format(format, args);

        underlyingPrintStream.print(line);
        lineLength += line.length();
    }

    public void print(String s) {
        clearLastLine();

        underlyingPrintStream.print(s);
        lineLength += s.length();
    }

    public void println() {
        clearLastLine();

        underlyingPrintStream.println();
        lineLength = 0;
    }

    public void println(String s) {
        clearLastLine();

        underlyingPrintStream.println(s);
        lineLength = 0;
    }

    public void printr() {
        printr("");
    }

    public void printr(Object s) {
        clearLastLine();

        underlyingPrintStream.print(s);

        lineLength = s.toString().length();
        lastWasWithCarriageReturn = true;
    }

    private void clearLastLine() {
        if (lastWasWithCarriageReturn) {
            String spacesStr = "\r" + Strings.repeat(" ", lineLength) + "\r";
            underlyingPrintStream.print(spacesStr);

            lastWasWithCarriageReturn = false;
        }
    }
}