jisql/src/main/java/org/apache/util/sql/MaskingThread.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.util.sql;

public class MaskingThread extends Thread {
    private       boolean stop;
    private final String  prompt;

    /**
     * @param thePrompt The prompt displayed to the user
     */
    public MaskingThread(String thePrompt) {
        prompt = thePrompt;
    }

    /**
     * Begin masking until asked to stop.
     */
    public void run() {
        while (!stop) {
            try {
                // attempt masking at this rate (refresh every 1 ms.)
                sleep(1);
            } catch (InterruptedException iex) {
                iex.printStackTrace();
            }

            if (!stop) {
                //
                // sd - note what this does.  If your prompt is really short
                // and your password is really long this won't work - some
                // characters will become visible
                //
                System.out.print("\r" + prompt + " \r" + prompt);
            }

            System.out.flush();
        }
    }

    /**
     * Instruct the thread to stop masking.
     */
    public void stopMasking() {
        stop = true;
    }
}