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/*
 * Copyright (C) 2011 The Guava Authors
 *
 * 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.google.common.primitives;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.primitives.UnsignedInts.INT_MASK;
import static com.google.common.primitives.UnsignedInts.compare;
import static com.google.common.primitives.UnsignedInts.toLong;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import java.math.BigInteger;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A wrapper class for unsigned {@code int} values, supporting arithmetic operations.
 *
 * 

In some cases, when speed is more important than code readability, it may be faster simply to * treat primitive {@code int} values as unsigned, using the methods from {@link UnsignedInts}. * *

See the Guava User Guide article on unsigned * primitive utilities. * * @author Louis Wasserman * @since 11.0 */ @GwtCompatible(emulated = true) public final class UnsignedInteger extends Number implements Comparable { public static final UnsignedInteger ZERO = fromIntBits(0); public static final UnsignedInteger ONE = fromIntBits(1); public static final UnsignedInteger MAX_VALUE = fromIntBits(-1); private final int value; private UnsignedInteger(int value) { // GWT doesn't consistently overflow values to make them 32-bit, so we need to force it. this.value = value & 0xffffffff; } /** * Returns an {@code UnsignedInteger} corresponding to a given bit representation. The argument is * interpreted as an unsigned 32-bit value. Specifically, the sign bit of {@code bits} is * interpreted as a normal bit, and all other bits are treated as usual. * *

If the argument is nonnegative, the returned result will be equal to {@code bits}, * otherwise, the result will be equal to {@code 2^32 + bits}. * *

To represent unsigned decimal constants, consider {@link #valueOf(long)} instead. * * @since 14.0 */ public static UnsignedInteger fromIntBits(int bits) { return new UnsignedInteger(bits); } /** * Returns an {@code UnsignedInteger} that is equal to {@code value}, if possible. The inverse * operation of {@link #longValue()}. */ public static UnsignedInteger valueOf(long value) { checkArgument( (value & INT_MASK) == value, "value (%s) is outside the range for an unsigned integer value", value); return fromIntBits((int) value); } /** * Returns a {@code UnsignedInteger} representing the same value as the specified {@link * BigInteger}. This is the inverse operation of {@link #bigIntegerValue()}. * * @throws IllegalArgumentException if {@code value} is negative or {@code value >= 2^32} */ public static UnsignedInteger valueOf(BigInteger value) { checkNotNull(value); checkArgument( value.signum() >= 0 && value.bitLength() <= Integer.SIZE, "value (%s) is outside the range for an unsigned integer value", value); return fromIntBits(value.intValue()); } /** * Returns an {@code UnsignedInteger} holding the value of the specified {@code String}, parsed as * an unsigned {@code int} value. * * @throws NumberFormatException if the string does not contain a parsable unsigned {@code int} * value */ public static UnsignedInteger valueOf(String string) { return valueOf(string, 10); } /** * Returns an {@code UnsignedInteger} holding the value of the specified {@code String}, parsed as * an unsigned {@code int} value in the specified radix. * * @throws NumberFormatException if the string does not contain a parsable unsigned {@code int} * value */ public static UnsignedInteger valueOf(String string, int radix) { return fromIntBits(UnsignedInts.parseUnsignedInt(string, radix)); } /** * Returns the result of adding this and {@code val}. If the result would have more than 32 bits, * returns the low 32 bits of the result. * * @since 14.0 */ public UnsignedInteger plus(UnsignedInteger val) { return fromIntBits(this.value + checkNotNull(val).value); } /** * Returns the result of subtracting this and {@code val}. If the result would be negative, * returns the low 32 bits of the result. * * @since 14.0 */ public UnsignedInteger minus(UnsignedInteger val) { return fromIntBits(value - checkNotNull(val).value); } /** * Returns the result of multiplying this and {@code val}. If the result would have more than 32 * bits, returns the low 32 bits of the result. * * @since 14.0 */ @GwtIncompatible // Does not truncate correctly public UnsignedInteger times(UnsignedInteger val) { // TODO(lowasser): make this GWT-compatible return fromIntBits(value * checkNotNull(val).value); } /** * Returns the result of dividing this by {@code val}. * * @throws ArithmeticException if {@code val} is zero * @since 14.0 */ public UnsignedInteger dividedBy(UnsignedInteger val) { return fromIntBits(UnsignedInts.divide(value, checkNotNull(val).value)); } /** * Returns this mod {@code val}. * * @throws ArithmeticException if {@code val} is zero * @since 14.0 */ public UnsignedInteger mod(UnsignedInteger val) { return fromIntBits(UnsignedInts.remainder(value, checkNotNull(val).value)); } /** * Returns the value of this {@code UnsignedInteger} as an {@code int}. This is an inverse * operation to {@link #fromIntBits}. * *

Note that if this {@code UnsignedInteger} holds a value {@code >= 2^31}, the returned value * will be equal to {@code this - 2^32}. */ @Override public int intValue() { return value; } /** Returns the value of this {@code UnsignedInteger} as a {@code long}. */ @Override public long longValue() { return toLong(value); } /** * Returns the value of this {@code UnsignedInteger} as a {@code float}, analogous to a widening * primitive conversion from {@code int} to {@code float}, and correctly rounded. */ @Override public float floatValue() { return longValue(); } /** * Returns the value of this {@code UnsignedInteger} as a {@code float}, analogous to a widening * primitive conversion from {@code int} to {@code double}, and correctly rounded. */ @Override public double doubleValue() { return longValue(); } /** Returns the value of this {@code UnsignedInteger} as a {@link BigInteger}. */ public BigInteger bigIntegerValue() { return BigInteger.valueOf(longValue()); } /** * Compares this unsigned integer to another unsigned integer. Returns {@code 0} if they are * equal, a negative number if {@code this < other}, and a positive number if {@code this > * other}. */ @Override public int compareTo(UnsignedInteger other) { checkNotNull(other); return compare(value, other.value); } @Override public int hashCode() { return value; } @Override public boolean equals(@Nullable Object obj) { if (obj instanceof UnsignedInteger) { UnsignedInteger other = (UnsignedInteger) obj; return value == other.value; } return false; } /** Returns a string representation of the {@code UnsignedInteger} value, in base 10. */ @Override public String toString() { return toString(10); } /** * Returns a string representation of the {@code UnsignedInteger} value, in base {@code radix}. If * {@code radix < Character.MIN_RADIX} or {@code radix > Character.MAX_RADIX}, the radix {@code * 10} is used. */ public String toString(int radix) { return UnsignedInts.toString(value, radix); } }





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