/*
 * Copyright 2018 Paul Schaub.
 *
 * 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 org.pgpainless.util;

import java.util.Arrays;

public class Passphrase {

    private final char[] chars;

    public Passphrase(char[] chars) {
        if (chars == null) {
            throw new NullPointerException("chars MUST NOT be null.");
        }
        this.chars = chars;
    }

    public void clear() {
        Arrays.fill(chars, ' ');
    }

    @Override
    protected void finalize() throws Throwable {
        clear();
        super.finalize();
    }

    public char[] getChars() {
        char[] copy = new char[chars.length];
        System.arraycopy(chars, 0, copy, 0, chars.length);
        return copy;
    }
}