/*
* Copyright 2008 Google Inc.
*
* 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 java.lang;
/**
* Wraps a primitive <code>long</code> as an object.
*/
public final class Long extends Number implements Comparable<Long> {
/**
* Use nested class to avoid clinit on outer.
*/
static class BoxedValues {
// Box values according to JLS - between -128 and 127
static Long[] boxedValues = new Long[256];
}
public static final long MAX_VALUE = 0x7fffffffffffffffL;
public static final long MIN_VALUE = 0x8000000000000000L;
public static final int SIZE = 64;
public static final int BYTES = SIZE / Byte.SIZE;
public static final Class<Long> TYPE = long.class;
public static int bitCount(long i) {
int high = (int) (i >> 32);
int low = (int) i;
return Integer.bitCount(high) + Integer.bitCount(low);
}
public static int compare(long x, long y) {
if (x < y) {
return -1;
} else if (x > y) {
return 1;
} else {
return 0;
}
}
public static Long decode(String s) throws NumberFormatException {
__Decode decode = __decodeNumberString(s);
return valueOf(decode.payload, decode.radix);
}
public static int hashCode(long l) {
return (int) l;
}
public static long highestOneBit(long i) {
int high = (int) (i >> 32);
if (high != 0) {
return ((long) Integer.highestOneBit(high)) << 32;
} else {
return Integer.highestOneBit((int) i) & 0xFFFFFFFFL;
}
}
public static long lowestOneBit(long i) {
return i & -i;
}
public static long max(long a, long b) {
return Math.max(a, b);
}
public static long min(long a, long b) {
return Math.min(a, b);
}
public static int numberOfLeadingZeros(long i) {
int high = (int) (i >> 32);
if (high != 0) {
return Integer.numberOfLeadingZeros(high);
} else {
return Integer.numberOfLeadingZeros((int) i) + 32;
}
}
public static int numberOfTrailingZeros(long i) {
int low = (int) i;
if (low != 0) {
return Integer.numberOfTrailingZeros(low);
} else {
return Integer.numberOfTrailingZeros((int) (i >> 32)) + 32;
}
}
public static long parseLong(String s) throws NumberFormatException {
return parseLong(s, 10);
}
public static long parseLong(String s, int radix) throws NumberFormatException {
return __parseAndValidateLong(s, radix);
}
public static long reverse(long i) {
int high = (int) (i >>> 32);
int low = (int) i;
return ((long) Integer.reverse(low) << 32)
| (Integer.reverse(high) & 0xffffffffL);
}
public static long reverseBytes(long i) {
int high = (int) (i >>> 32);
int low = (int) i;
return ((long) Integer.reverseBytes(low) << 32)
| (Integer.reverseBytes(high) & 0xffffffffL);
}
public static long rotateLeft(long i, int distance) {
while (distance-- > 0) {
i = i << 1 | ((i < 0) ? 1 : 0);
}
return i;
}
public static long rotateRight(long i, int distance) {
long ui = i & MAX_VALUE; // avoid sign extension
long carry = (i < 0) ? 0x4000000000000000L : 0; // MIN_VALUE rightshifted 1
while (distance-- > 0) {
long nextcarry = ui & 1;
ui = carry | (ui >> 1);
carry = (nextcarry == 0) ? 0 : 0x4000000000000000L;
}
if (carry != 0) {
ui = ui | MIN_VALUE;
}
return ui;
}
public static int signum(long i) {
if (i == 0) {
return 0;
} else if (i < 0) {
return -1;
} else {
return 1;
}
}
public static long sum(long a, long b) {
return a + b;
}
public static String toBinaryString(long value) {
return toPowerOfTwoUnsignedString(value, 1);
}
public static String toHexString(long value) {
return toPowerOfTwoUnsignedString(value, 4);
}
public static String toOctalString(long value) {
return toPowerOfTwoUnsignedString(value, 3);
}
public static String toString(long value) {
return String.valueOf(value);
}
public static String toString(long value, int intRadix) {
if (intRadix == 10 || intRadix < Character.MIN_RADIX || intRadix > Character.MAX_RADIX) {
return String.valueOf(value);
}
int intValue = (int) value;
if (intValue == value) {
return Integer.toString(intValue, intRadix);
}
/*
* If v is positive, negate it. This is the opposite of what one might expect. It is necessary
* because the range of the negative values is strictly larger than that of the positive values:
* there is no positive value corresponding to Long.MIN_VALUE.
*/
boolean negative = value < 0;
if (!negative) {
value = -value;
}
int bufLen = intRadix < 8 ? 65 : 23; // Max chars in result (conservative)
char[] buf = new char[bufLen];
int cursor = bufLen;
// Convert radix to long before hand to avoid costly conversion on each iteration.
long radix = intRadix;
do {
long q = value / radix;
buf[--cursor] = Character.forDigit((int) (radix * q - value));
value = q;
} while (value != 0);
if (negative) {
buf[--cursor] = '-';
}
return String.valueOf(buf, cursor, bufLen - cursor);
}
public static Long valueOf(long i) {
if (i > -129 && i < 128) {
int rebase = (int) i + 128;
Long result = BoxedValues.boxedValues[rebase];
if (result == null) {
result = BoxedValues.boxedValues[rebase] = new Long(i);
}
return result;
}
return new Long(i);
}
public static Long valueOf(String s) throws NumberFormatException {
return valueOf(s, 10);
}
public static Long valueOf(String s, int radix) throws NumberFormatException {
return valueOf(parseLong(s, radix));
}
private static String toPowerOfTwoUnsignedString(long value, int shift) {
final int radix = 1 << shift;
if (Integer.MIN_VALUE <= value && value <= Integer.MAX_VALUE) {
return Integer.toString((int) value, radix);
}
final int mask = radix - 1;
final int bufSize = 64 / shift + 1;
char[] buf = new char[bufSize];
int pos = bufSize;
do {
buf[--pos] = Character.forDigit(((int) value) & mask);
value >>>= shift;
} while (value != 0);
return String.valueOf(buf, pos, bufSize - pos);
}
private final transient long value;
public Long(long value) {
this.value = value;
}
public Long(String s) {
value = parseLong(s);
}
@Override
public byte byteValue() {
return (byte) value;
}
@Override
public int compareTo(Long b) {
return compare(value, b.value);
}
@Override
public double doubleValue() {
return value;
}
@Override
public boolean equals(Object o) {
return (o instanceof Long) && (((Long) o).value == value);
}
@Override
public float floatValue() {
return value;
}
@Override
public int hashCode() {
return hashCode(value);
}
@Override
public int intValue() {
return (int) value;
}
@Override
public long longValue() {
return value;
}
@Override
public short shortValue() {
return (short) value;
}
@Override
public String toString() {
return toString(value);
}
}