org.apache.solr.update.processor.MD5Signature Maven / Gradle / Ivy

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Apache Solr (module: core)

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/*
 * 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.solr.update.processor;

import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Signature extends Signature {
  private static ThreadLocal DIGESTER_FACTORY =
      new ThreadLocal() {
        @Override
        protected MessageDigest initialValue() {
          try {
            return MessageDigest.getInstance("MD5");
          } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
          }
        }
      };
  private MessageDigest digester;

  public MD5Signature() {
    digester = DIGESTER_FACTORY.get();
    digester.reset();
  }

  @Override
  public void add(String content) {
    digester.update(content.getBytes(StandardCharsets.UTF_8));
  }

  @Override
  public byte[] getSignature() {
    return digester.digest();
  }
}