common/src/main/java/org/apache/cassandra/sidecar/common/data/MD5Digest.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.cassandra.sidecar.common.data;

import java.util.Collections;
import java.util.Map;
import java.util.Objects;

import io.netty.handler.codec.http.HttpHeaderNames;
import org.jetbrains.annotations.NotNull;

/**
 * Implements the MD5 checksum digest
 */
public class MD5Digest implements Digest
{
    private final @NotNull String value;

    /**
     * Constructs a new MD5Digest with the provided MD5 {@code value}
     *
     * @param value the MD5 value
     */
    public MD5Digest(@NotNull String value)
    {
        this.value = Objects.requireNonNull(value, "value is required");
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String value()
    {
        return value;
    }

    @Override
    public String algorithm()
    {
        return "MD5";
    }

    /**
     * @return MD5 headers for the Digest
     */
    @Override
    public Map<String, String> headers()
    {
        return Collections.singletonMap(HttpHeaderNames.CONTENT_MD5.toString(), value);
    }
}