com.orientechnologies.orient.core.storage.index.hashindex.local.OMurmurHash3HashFunction Maven / Gradle / Ivy
/*
*
* * Copyright 2010-2016 OrientDB LTD (http://orientdb.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.
* *
* * For more information: http://orientdb.com
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*/
package com.orientechnologies.orient.core.storage.index.hashindex.local;
import com.orientechnologies.common.hash.OMurmurHash3;
import com.orientechnologies.common.serialization.types.OBinarySerializer;
/**
* @author Andrey Lomakin (a.lomakin-at-orientdb.com)
* @since 12.03.13
*/
public class OMurmurHash3HashFunction implements OHashFunction {
private static final int SEED = 362498820;
private final OBinarySerializer valueSerializer;
public OMurmurHash3HashFunction(OBinarySerializer valueSerializer) {
this.valueSerializer = valueSerializer;
}
@Override
public long hashCode(final V value) {
final byte[] serializedValue = new byte[valueSerializer.getObjectSize(value)];
valueSerializer.serializeNativeObject(value, serializedValue, 0);
return OMurmurHash3.murmurHash3_x64_64(serializedValue, SEED);
}
}