JDK14/Java14源码在线阅读

/*
 * 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.
 *
 * https://opensource.org/licenses/BSD-3-Clause
 */
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);
            }

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