/**
 * 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.ranger.authorization.hive.udf;

import java.sql.Date;

import org.apache.commons.codec.digest.DigestUtils;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;


@Description(name = "mask_hash",
             value = "returns hash of the given value",
             extended = "Examples:\n "
                      + "  mask_hash(value)\n "
                      + "Arguments:\n "
                      + "  value - value to mask. Supported types: STRING, VARCHAR, CHAR"
            )
public class RangerUdfMaskHash extends RangerBaseUdf {
  public static final String UDF_NAME = "mask_hash";

  public RangerUdfMaskHash() {
    super(new MaskHashTransformer(), UDF_NAME);
  }
}

class MaskHashTransformer extends AbstractTransformer {
  @Override
  public void init(ObjectInspector[] arguments, int startIdx) {
  }

  @Override
  String transform(final String value) {
    return DigestUtils.md5Hex(value);
  }

  @Override
  Byte transform(final Byte value) {
    return null;
  }

  @Override
  Short transform(final Short value) {
    return null;
  }

  @Override
  Integer transform(final Integer value) {
    return null;
  }

  @Override
  Long transform(final Long value) {
    return null;
  }

  @Override
  Date transform(final Date value) {
    return null;
  }
}