/*
 * Copyright 2010-2012 Luca Garulli (l.garulli--at--orientechnologies.com)
 *
 * 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 com.orientechnologies.orient.core.index.hashindex.local;

import com.orientechnologies.common.hash.OMurmurHash3;
import com.orientechnologies.common.serialization.types.OBinarySerializer;

/**
 * @author Andrey Lomakin
 * @since 12.03.13
 */
public class OMurmurHash3HashFunction<V> implements OHashFunction<V> {
  private static final int     SEED = 362498820;

  private OBinarySerializer<V> valueSerializer;

  public OBinarySerializer<V> getValueSerializer() {
    return valueSerializer;
  }

  public void setValueSerializer(OBinarySerializer<V> valueSerializer) {
    this.valueSerializer = valueSerializer;
  }

  @Override
  public long hashCode(V value) {
    final byte[] serializedValue = new byte[valueSerializer.getObjectSize(value)];
    valueSerializer.serializeNative(value, serializedValue, 0);
    return OMurmurHash3.murmurHash3_x64_64(serializedValue, SEED);
  }
}
