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/*
* Copyright (C) 2022 The Android Open Source Project
*
* 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.android.adservices.service.measurement.util;
import android.annotation.NonNull;
import java.math.BigInteger;
import java.util.Objects;
/**
* A type that stores a numeric value as a Long, but is meant for representation in strings and
* math operations as an unsigned 64 bit integer, using the 64th bit as part of its magnitude.
*/
public class UnsignedLong implements Comparable<UnsignedLong> {
private final Long mValue;
public UnsignedLong(@NonNull Long value) {
Validation.validateNonNull(value);
mValue = value;
}
public UnsignedLong(@NonNull String value) {
Validation.validateNonNull(value);
mValue = Long.parseUnsignedLong(value);
}
@Override
public int hashCode() {
return Objects.hash(mValue);
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof UnsignedLong)) {
return false;
}
UnsignedLong other = (UnsignedLong) obj;
return Objects.equals(mValue, other.getValue());
}
@Override
public int compareTo(UnsignedLong other) {
if (mValue >= 0L) {
if (other.getValue() >= 0) {
return Long.compare(mValue, other.getValue());
} else {
return -1;
}
} else {
if (other.getValue() >= 0) {
return 1;
} else {
return Long.compare(mValue, other.getValue());
}
}
}
@Override
public String toString() {
return Long.toUnsignedString(mValue);
}
public Long getValue() {
return mValue;
}
/**
* Returns the {@code BigInteger} mod operation of the unsigned value and modulus as an
* {@code UnsignedLong}.
*/
public UnsignedLong mod(int modulus) {
BigInteger truncated = new BigInteger(Long.toUnsignedString(mValue))
.mod(BigInteger.valueOf(modulus));
return new UnsignedLong(truncated.toString());
}
}
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