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Common functionality for HBase

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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.hadoop.hbase.io.crypto;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.io.crypto.aes.AES;
import org.apache.yetus.audience.InterfaceAudience;

/**
 * The default cipher provider. Supports AES via the JCE.
 */
@InterfaceAudience.Public
public final class DefaultCipherProvider implements CipherProvider {

  private static DefaultCipherProvider instance;

  @edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "MS_EXPOSE_REP",
      justification = "singleton pattern")
  public static DefaultCipherProvider getInstance() {
    if (instance != null) {
      return instance;
    }
    instance = new DefaultCipherProvider();
    return instance;
  }

  private Configuration conf = HBaseConfiguration.create();

  // Prevent instantiation
  private DefaultCipherProvider() {
  }

  @Override
  public Configuration getConf() {
    return conf;
  }

  @Override
  public void setConf(Configuration conf) {
    this.conf = conf;
  }

  @Override
  public String getName() {
    return "default";
  }

  @Override
  public Cipher getCipher(String name) {
    if (name.equalsIgnoreCase("AES")) {
      return new AES(this);
    }
    throw new RuntimeException(
      "Cipher '" + name + "' is not supported by provider '" + getName() + "'");
  }

  @Override
  public String[] getSupportedCiphers() {
    return new String[] { "AES" };
  }

}