ConsolePrintStream.java

/*
 * Copyright 2010 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package net.gnehzr.tnoodle.js;

import java.io.OutputStream;
import java.io.PrintStream;

/**
 * Print stream for GWT that prints to the browser console.
 *
 * @author Stefan Haustein
 */
public class ConsolePrintStream extends PrintStream {

    StringBuilder buf = new StringBuilder();

    public ConsolePrintStream()  {
        super((OutputStream) null);
    }

    public void print(String s) {
        while(true) {
            int cut = s.indexOf('\n');
            if(cut == -1) {
                break;
            }
            println(s.substring(0, cut));
            s = s.substring(cut + 1);
        }

        buf.append(s);
    }

    public native void consoleLog(String msg) /*-{
        if (window.console) {
            window.console.log(msg);
        } else {
            document.title = "LOG:" + msg;
        }
    }-*/;

    public void print(char c) {
        if (c == '\n') {
            println("");
        } else {
            buf.append(c);
        }
    }

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

    @Override
    public void println(String s) {
        buf.append(s);
        consoleLog(buf.toString());
        buf.setLength(0);
    }

}