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/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.common;
import org.apache.lucene.util.BytesRef;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.nio.ByteOrder;
/**
* A set of utilities for numbers.
*/
public final class Numbers {
private static final VarHandle BIG_ENDIAN_SHORT = MethodHandles.byteArrayViewVarHandle(short[].class, ByteOrder.BIG_ENDIAN);
private static final VarHandle BIG_ENDIAN_INT = MethodHandles.byteArrayViewVarHandle(int[].class, ByteOrder.BIG_ENDIAN);
private static final VarHandle BIG_ENDIAN_LONG = MethodHandles.byteArrayViewVarHandle(long[].class, ByteOrder.BIG_ENDIAN);
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 short bytesToShort(byte[] bytes, int offset) {
return (short) BIG_ENDIAN_SHORT.get(bytes, offset);
}
public static int bytesToInt(byte[] bytes, int offset) {
return (int) BIG_ENDIAN_INT.get(bytes, offset);
}
public static long bytesToLong(byte[] bytes, int offset) {
return (long) BIG_ENDIAN_LONG.get(bytes, offset);
}
public static long bytesToLong(BytesRef bytes) {
return bytesToLong(bytes.bytes, bytes.offset);
}
public static byte[] intToBytes(int val) {
byte[] arr = new byte[4];
BIG_ENDIAN_INT.set(arr, 0, 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];
BIG_ENDIAN_SHORT.set(arr, 0, (short) 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];
BIG_ENDIAN_LONG.set(arr, 0, 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;
}
/**
* Checks if the given string can be parsed as a positive integer value.
*/
public static boolean isPositiveNumeric(String string) {
for (int i = 0; i < string.length(); ++i) {
final char c = string.charAt(i);
if (c < '0' || c > '9') {
return false;
}
}
return true;
}
}
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