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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.common;
import org.apache.lucene.util.BytesRef;
import java.math.BigDecimal;
import java.math.BigInteger;
/**
* A set of utilities for numbers.
*/
public final class Numbers {
private static final BigInteger MAX_LONG_VALUE = BigInteger.valueOf(Long.MAX_VALUE);
private static final BigInteger MIN_LONG_VALUE = BigInteger.valueOf(Long.MIN_VALUE);
private Numbers() {
}
public static long bytesToLong(BytesRef bytes) {
int high = (bytes.bytes[bytes.offset + 0] << 24) | ((bytes.bytes[bytes.offset + 1] & 0xff) << 16) |
((bytes.bytes[bytes.offset + 2] & 0xff) << 8) | (bytes.bytes[bytes.offset + 3] & 0xff);
int low = (bytes.bytes[bytes.offset + 4] << 24) | ((bytes.bytes[bytes.offset + 5] & 0xff) << 16) |
((bytes.bytes[bytes.offset + 6] & 0xff) << 8) | (bytes.bytes[bytes.offset + 7] & 0xff);
return (((long) high) << 32) | (low & 0x0ffffffffL);
}
public static byte[] intToBytes(int val) {
byte[] arr = new byte[4];
arr[0] = (byte) (val >>> 24);
arr[1] = (byte) (val >>> 16);
arr[2] = (byte) (val >>> 8);
arr[3] = (byte) (val);
return arr;
}
/**
* Converts an int to a byte array.
*
* @param val The int to convert to a byte array
* @return The byte array converted
*/
public static byte[] shortToBytes(int val) {
byte[] arr = new byte[2];
arr[0] = (byte) (val >>> 8);
arr[1] = (byte) (val);
return arr;
}
/**
* Converts a long to a byte array.
*
* @param val The long to convert to a byte array
* @return The byte array converted
*/
public static byte[] longToBytes(long val) {
byte[] arr = new byte[8];
arr[0] = (byte) (val >>> 56);
arr[1] = (byte) (val >>> 48);
arr[2] = (byte) (val >>> 40);
arr[3] = (byte) (val >>> 32);
arr[4] = (byte) (val >>> 24);
arr[5] = (byte) (val >>> 16);
arr[6] = (byte) (val >>> 8);
arr[7] = (byte) (val);
return arr;
}
/**
* Converts a double to a byte array.
*
* @param val The double to convert to a byte array
* @return The byte array converted
*/
public static byte[] doubleToBytes(double val) {
return longToBytes(Double.doubleToRawLongBits(val));
}
/** Returns true if value is neither NaN nor infinite. */
public static boolean isValidDouble(double value) {
if (Double.isNaN(value) || Double.isInfinite(value)) {
return false;
}
return true;
}
/** Return the long that {@code n} stores, or throws an exception if the
* stored value cannot be converted to a long that stores the exact same
* value. */
public static long toLongExact(Number n) {
if (n instanceof Byte || n instanceof Short || n instanceof Integer
|| n instanceof Long) {
return n.longValue();
} else if (n instanceof Float || n instanceof Double) {
double d = n.doubleValue();
if (d != Math.round(d)) {
throw new IllegalArgumentException(n + " is not an integer value");
}
return n.longValue();
} else if (n instanceof BigDecimal) {
return ((BigDecimal) n).toBigIntegerExact().longValueExact();
} else if (n instanceof BigInteger) {
return ((BigInteger) n).longValueExact();
} else {
throw new IllegalArgumentException("Cannot check whether [" + n + "] of class [" + n.getClass().getName()
+ "] is actually a long");
}
}
// weak bounds on the BigDecimal representation to allow for coercion
private static BigDecimal BIGDECIMAL_GREATER_THAN_LONG_MAX_VALUE = BigDecimal.valueOf(Long.MAX_VALUE).add(BigDecimal.ONE);
private static BigDecimal BIGDECIMAL_LESS_THAN_LONG_MIN_VALUE = BigDecimal.valueOf(Long.MIN_VALUE).subtract(BigDecimal.ONE);
/** Return the long that {@code stringValue} stores or throws an exception if the
* stored value cannot be converted to a long that stores the exact same
* value and {@code coerce} is false. */
public static long toLong(String stringValue, boolean coerce) {
try {
return Long.parseLong(stringValue);
} catch (NumberFormatException e) {
// we will try again with BigDecimal
}
final BigInteger bigIntegerValue;
try {
BigDecimal bigDecimalValue = new BigDecimal(stringValue);
if (bigDecimalValue.compareTo(BIGDECIMAL_GREATER_THAN_LONG_MAX_VALUE) >= 0 ||
bigDecimalValue.compareTo(BIGDECIMAL_LESS_THAN_LONG_MIN_VALUE) <= 0) {
throw new IllegalArgumentException("Value [" + stringValue + "] is out of range for a long");
}
bigIntegerValue = coerce ? bigDecimalValue.toBigInteger() : bigDecimalValue.toBigIntegerExact();
} catch (ArithmeticException e) {
throw new IllegalArgumentException("Value [" + stringValue + "] has a decimal part");
} catch (NumberFormatException e) {
throw new IllegalArgumentException("For input string: \"" + stringValue + "\"");
}
if (bigIntegerValue.compareTo(MAX_LONG_VALUE) > 0 || bigIntegerValue.compareTo(MIN_LONG_VALUE) < 0) {
throw new IllegalArgumentException("Value [" + stringValue + "] is out of range for a long");
}
return bigIntegerValue.longValue();
}
/** Return the int that {@code n} stores, or throws an exception if the
* stored value cannot be converted to an int that stores the exact same
* value. */
public static int toIntExact(Number n) {
return Math.toIntExact(toLongExact(n));
}
/** Return the short that {@code n} stores, or throws an exception if the
* stored value cannot be converted to a short that stores the exact same
* value. */
public static short toShortExact(Number n) {
long l = toLongExact(n);
if (l != (short) l) {
throw new ArithmeticException("short overflow: " + l);
}
return (short) l;
}
/** Return the byte that {@code n} stores, or throws an exception if the
* stored value cannot be converted to a byte that stores the exact same
* value. */
public static byte toByteExact(Number n) {
long l = toLongExact(n);
if (l != (byte) l) {
throw new ArithmeticException("byte overflow: " + l);
}
return (byte) l;
}
}