/*
* 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 Numbers() {
}
/**
* Converts a byte array to an short.
*
* @param arr The byte array to convert to an short
* @return The int converted
*/
public static short bytesToShort(byte[] arr) {
return (short) (((arr[0] & 0xff) << 8) | (arr[1] & 0xff));
}
public static short bytesToShort(BytesRef bytes) {
return (short) (((bytes.bytes[bytes.offset] & 0xff) << 8) | (bytes.bytes[bytes.offset + 1] & 0xff));
}
/**
* Converts a byte array to an int.
*
* @param arr The byte array to convert to an int
* @return The int converted
*/
public static int bytesToInt(byte[] arr) {
return (arr[0] << 24) | ((arr[1] & 0xff) << 16) | ((arr[2] & 0xff) << 8) | (arr[3] & 0xff);
}
public static int bytesToInt(BytesRef bytes) {
return (bytes.bytes[bytes.offset] << 24) | ((bytes.bytes[bytes.offset + 1] & 0xff) << 16) | ((bytes.bytes[bytes.offset + 2] & 0xff) << 8) | (bytes.bytes[bytes.offset + 3] & 0xff);
}
/**
* Converts a byte array to a long.
*
* @param arr The byte array to convert to a long
* @return The long converter
*/
public static long bytesToLong(byte[] arr) {
int high = (arr[0] << 24) | ((arr[1] & 0xff) << 16) | ((arr[2] & 0xff) << 8) | (arr[3] & 0xff);
int low = (arr[4] << 24) | ((arr[5] & 0xff) << 16) | ((arr[6] & 0xff) << 8) | (arr[7] & 0xff);
return (((long) high) << 32) | (low & 0x0ffffffffL);
}
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);
}
/**
* Converts a byte array to float.
*
* @param arr The byte array to convert to a float
* @return The float converted
*/
public static float bytesToFloat(byte[] arr) {
return Float.intBitsToFloat(bytesToInt(arr));
}
public static float bytesToFloat(BytesRef bytes) {
return Float.intBitsToFloat(bytesToInt(bytes));
}
/**
* Converts a byte array to double.
*
* @param arr The byte array to convert to a double
* @return The double converted
*/
public static double bytesToDouble(byte[] arr) {
return Double.longBitsToDouble(bytesToLong(arr));
}
public static double bytesToDouble(BytesRef bytes) {
return Double.longBitsToDouble(bytesToLong(bytes));
}
/**
* 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[] 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 float to a byte array.
*
* @param val The float to convert to a byte array
* @return The byte array converted
*/
public static byte[] floatToBytes(float val) {
return intToBytes(Float.floatToRawIntBits(val));
}
/**
* 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");
}
}
/** 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;
}
}