// 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.impala.util;

import com.google.common.base.Preconditions;

import java.util.Objects;

import org.apache.impala.thrift.THash128;

/**

* Represents a 128-bit hash value using two longs (high and low 64 bits).

*

* Usage:

* - Create: Hash128 hash = IcebergUtil.getFilePathHash(filePath);

* - As map key: map.put(hash, value);

* - Thrift: THash128 t = hash.toThrift(); Hash128 h = Hash128.fromThrift(t);

* - Logging: LOG.debug("Hash: {}", hash.toString());

*/

public class Hash128 {

private final long high_;

private final long low_;

public Hash128(long high, long low) {

high_ = high;

low_ = low;

}

public long getHigh() {

return high_;

}

public long getLow() {

return low_;

}

/**

* Converts this hash to a Thrift THash128 struct for serialization.

*/

public THash128 toThrift() {

return new THash128(high_, low_);

}

/**

* Creates a Hash128 from a Thrift THash128 struct.

*/

public static Hash128 fromThrift(THash128 thrift) {

Preconditions.checkNotNull(thrift);

return new Hash128(thrift.getHigh(), thrift.getLow());

}

@Override

public boolean equals(Object o) {

if (this == o) return true;

if (o == null || getClass() != o.getClass()) return false;

Hash128 hash128 = (Hash128) o;

return high_ == hash128.high_ && low_ == hash128.low_;

}

@Override

public int hashCode() {

return Objects.hash(high_, low_);

}

@Override

public String toString() {

// Return hexadecimal representation for debugging

return String.format("%016x%016x", high_, low_);

}

}