/*

 * Copyright (c) 2002-2017, the original author or authors.

 *

 * This software is distributable under the BSD license. See the terms of the

 * BSD license in the documentation provided with this software.

 *

 */

package jdk.internal.org.jline.reader.impl;

import jdk.internal.org.jline.reader.MaskingCallback;

import java.util.Objects;

/**

 * Simple {@link MaskingCallback} that will replace all the characters in the line with the given mask.

 * If the given mask is equal to {@link LineReaderImpl#NULL_MASK} then the line will be replaced with an empty String.

 */

public final class SimpleMaskingCallback implements MaskingCallback {

    private final Character mask;

    public SimpleMaskingCallback(Character mask) {

        this.mask = Objects.requireNonNull(mask, "mask must be a non null character");

    }

    @Override

    public String display(String line) {

        if (mask.equals(LineReaderImpl.NULL_MASK)) {

            return "";

        } else {

            StringBuilder sb = new StringBuilder(line.length());

            for (int i = line.length(); i-- > 0;) {

                sb.append((char) mask);

            }

            return sb.toString();

        }

    }

    @Override

    public String history(String line) {

        return null;

    }

}