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/*
* Copyright (c) 2021-2023. caoccao.com Sam Cao
*
* 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.caoccao.javet.values.primitive;
import com.caoccao.javet.exceptions.JavetException;
import com.caoccao.javet.interop.V8Runtime;
import java.math.BigInteger;
import java.util.Objects;
/**
* The type V8 value big integer.
*
* This feature is experimental and not completed yet.
*
* @since 1.1.5
*/
@SuppressWarnings("unchecked")
public final class V8ValueBigInteger extends V8ValuePrimitive {
private static final int BYTE_COUNT_PER_WORD = 8;
/**
* Instantiates a new V8 value big integer.
*
* @param v8Runtime the V8 runtime
* @throws JavetException the javet exception
* @since 1.1.5
*/
public V8ValueBigInteger(V8Runtime v8Runtime) throws JavetException {
this(v8Runtime, BigInteger.ZERO);
}
/**
* Instantiates a new V8 value big integer.
*
* @param v8Runtime the V8 runtime
* @param value the big integer
* @throws JavetException the javet exception
* @since 1.1.5
*/
public V8ValueBigInteger(V8Runtime v8Runtime, BigInteger value) throws JavetException {
super(v8Runtime, Objects.requireNonNull(value));
}
/**
* Instantiates a new V8 value big integer.
*
* @param v8Runtime the V8 runtime
* @param value the string value
* @throws JavetException the javet exception
* @since 1.1.5
*/
public V8ValueBigInteger(V8Runtime v8Runtime, String value) throws JavetException {
this(v8Runtime, new BigInteger(Objects.requireNonNull(value)));
}
/**
* Instantiates a new V8 value big integer.
*
* @param v8Runtime the V8 runtime
* @param signum the signum
* 1: Positive
* 0: 0
* -1: Negative
* @param longArray the long array
* @throws JavetException the javet exception
*/
V8ValueBigInteger(V8Runtime v8Runtime, int signum, long[] longArray) throws JavetException {
this(v8Runtime, toBigInteger(signum, longArray));
}
/**
* To big integer from signum and long array.
*
* @param signum the signum
* 1: Positive
* 0: 0
* -1: Negative
* @param longArray the long array
* @return the big integer
* @since 1.1.5
*/
static BigInteger toBigInteger(int signum, long[] longArray) {
if (signum == 0 || signum > 1 || signum < -1 || longArray == null || longArray.length == 0) {
return BigInteger.ZERO;
}
final int longLength = longArray.length;
final int byteLength = longLength * BYTE_COUNT_PER_WORD;
byte[] bytes = new byte[byteLength];
for (int i = 0; i < longLength; ++i) {
final int startIndex = (longLength - 1 - i) * BYTE_COUNT_PER_WORD;
final int endIndex = startIndex + BYTE_COUNT_PER_WORD;
long l = longArray[i];
for (int j = startIndex; j < endIndex; ++j) {
bytes[j] = (byte) (0xFF & (l >> (endIndex - 1 - j) * BYTE_COUNT_PER_WORD));
}
}
return new BigInteger(signum, bytes);
}
/**
* To long array from signum and byte array.
*
* @param signum the signum
* 1: Positive
* 0: 0
* -1: Negative
* @param bytes the bytes
* @return the long array
* @since 1.1.5
*/
static long[] toLongArray(final int signum, final byte[] bytes) {
if (signum == 0) {
return null;
}
final int byteLength = bytes.length;
final int longLength = (byteLength + BYTE_COUNT_PER_WORD - 1) / BYTE_COUNT_PER_WORD;
long[] longArray = new long[longLength];
for (int i = 0; i < longLength; ++i) {
final int startIndex = byteLength - (i + 1) * BYTE_COUNT_PER_WORD;
final int endIndex = startIndex + BYTE_COUNT_PER_WORD;
long longValue = 0L;
for (int j = Math.max(0, startIndex); j < endIndex; ++j) {
// Apply NOT operation to every byte if the big integer has a negative signum.
long l = 0xFF & (signum < 0 ? ~bytes[j] : bytes[j]);
longValue |= (l << ((endIndex - 1 - j) * BYTE_COUNT_PER_WORD));
}
longArray[i] = longValue;
}
if (signum < 0) {
/*
* Increment the long value if the big integer has a negative signum
* because of the nature of the logical negation.
*/
for (int i = 0; i < longLength; ++i) {
longArray[i]++;
if (longArray[i] != 0L) {
break;
}
}
}
return longArray;
}
/**
* Get long array.
*
* @return the long array
* @since 1.1.5
*/
long[] getLongArray() {
return toLongArray(value.signum(), value.toByteArray());
}
/**
* Gets signum.
* 1: Positive
* 0: 0
* -1: Negative
*
* @return the signum
* @since 1.1.5
*/
int getSignum() {
return value.signum();
}
@Override
public V8ValueBigInteger toClone(boolean referenceCopy) throws JavetException {
return this;
}
/**
* To primitive big integer.
*
* @return the big integer
* @since 1.1.5
*/
public BigInteger toPrimitive() {
return value;
}
}