/* | |
* Licensed to the Apache Software Foundation (ASF) under one or more | |
* contributor license agreements. See the NOTICE file distributed with | |
* this work for additional information regarding copyright ownership. | |
* The ASF 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.apache.commons.lang3.math; | |
import java.lang.reflect.Array; | |
import java.math.BigDecimal; | |
import java.math.BigInteger; | |
import org.apache.commons.lang3.StringUtils; | |
import org.apache.commons.lang3.Validate; | |
/** | |
* <p>Provides extra functionality for Java Number classes.</p> | |
* | |
* @since 2.0 | |
*/ | |
public class NumberUtils { | |
/** Reusable Long constant for zero. */ | |
public static final Long LONG_ZERO = Long.valueOf(0L); | |
/** Reusable Long constant for one. */ | |
public static final Long LONG_ONE = Long.valueOf(1L); | |
/** Reusable Long constant for minus one. */ | |
public static final Long LONG_MINUS_ONE = Long.valueOf(-1L); | |
/** Reusable Integer constant for zero. */ | |
public static final Integer INTEGER_ZERO = Integer.valueOf(0); | |
/** Reusable Integer constant for one. */ | |
public static final Integer INTEGER_ONE = Integer.valueOf(1); | |
/** Reusable Integer constant for minus one. */ | |
public static final Integer INTEGER_MINUS_ONE = Integer.valueOf(-1); | |
/** Reusable Short constant for zero. */ | |
public static final Short SHORT_ZERO = Short.valueOf((short) 0); | |
/** Reusable Short constant for one. */ | |
public static final Short SHORT_ONE = Short.valueOf((short) 1); | |
/** Reusable Short constant for minus one. */ | |
public static final Short SHORT_MINUS_ONE = Short.valueOf((short) -1); | |
/** Reusable Byte constant for zero. */ | |
public static final Byte BYTE_ZERO = Byte.valueOf((byte) 0); | |
/** Reusable Byte constant for one. */ | |
public static final Byte BYTE_ONE = Byte.valueOf((byte) 1); | |
/** Reusable Byte constant for minus one. */ | |
public static final Byte BYTE_MINUS_ONE = Byte.valueOf((byte) -1); | |
/** Reusable Double constant for zero. */ | |
public static final Double DOUBLE_ZERO = Double.valueOf(0.0d); | |
/** Reusable Double constant for one. */ | |
public static final Double DOUBLE_ONE = Double.valueOf(1.0d); | |
/** Reusable Double constant for minus one. */ | |
public static final Double DOUBLE_MINUS_ONE = Double.valueOf(-1.0d); | |
/** Reusable Float constant for zero. */ | |
public static final Float FLOAT_ZERO = Float.valueOf(0.0f); | |
/** Reusable Float constant for one. */ | |
public static final Float FLOAT_ONE = Float.valueOf(1.0f); | |
/** Reusable Float constant for minus one. */ | |
public static final Float FLOAT_MINUS_ONE = Float.valueOf(-1.0f); | |
/** | |
* <p><code>NumberUtils</code> instances should NOT be constructed in standard programming. | |
* Instead, the class should be used as <code>NumberUtils.toInt("6");</code>.</p> | |
* | |
* <p>This constructor is public to permit tools that require a JavaBean instance | |
* to operate.</p> | |
*/ | |
public NumberUtils() { | |
super(); | |
} | |
//----------------------------------------------------------------------- | |
/** | |
* <p>Convert a <code>String</code> to an <code>int</code>, returning | |
* <code>zero</code> if the conversion fails.</p> | |
* | |
* <p>If the string is <code>null</code>, <code>zero</code> is returned.</p> | |
* | |
* <pre> | |
* NumberUtils.toInt(null) = 0 | |
* NumberUtils.toInt("") = 0 | |
* NumberUtils.toInt("1") = 1 | |
* </pre> | |
* | |
* @param str the string to convert, may be null | |
* @return the int represented by the string, or <code>zero</code> if | |
* conversion fails | |
* @since 2.1 | |
*/ | |
public static int toInt(final String str) { | |
return toInt(str, 0); | |
} | |
/** | |
* <p>Convert a <code>String</code> to an <code>int</code>, returning a | |
* default value if the conversion fails.</p> | |
* | |
* <p>If the string is <code>null</code>, the default value is returned.</p> | |
* | |
* <pre> | |
* NumberUtils.toInt(null, 1) = 1 | |
* NumberUtils.toInt("", 1) = 1 | |
* NumberUtils.toInt("1", 0) = 1 | |
* </pre> | |
* | |
* @param str the string to convert, may be null | |
* @param defaultValue the default value | |
* @return the int represented by the string, or the default if conversion fails | |
* @since 2.1 | |
*/ | |
public static int toInt(final String str, final int defaultValue) { | |
if(str == null) { | |
return defaultValue; | |
} | |
try { | |
return Integer.parseInt(str); | |
} catch (final NumberFormatException nfe) { | |
return defaultValue; | |
} | |
} | |
/** | |
* <p>Convert a <code>String</code> to a <code>long</code>, returning | |
* <code>zero</code> if the conversion fails.</p> | |
* | |
* <p>If the string is <code>null</code>, <code>zero</code> is returned.</p> | |
* | |
* <pre> | |
* NumberUtils.toLong(null) = 0L | |
* NumberUtils.toLong("") = 0L | |
* NumberUtils.toLong("1") = 1L | |
* </pre> | |
* | |
* @param str the string to convert, may be null | |
* @return the long represented by the string, or <code>0</code> if | |
* conversion fails | |
* @since 2.1 | |
*/ | |
public static long toLong(final String str) { | |
return toLong(str, 0L); | |
} | |
/** | |
* <p>Convert a <code>String</code> to a <code>long</code>, returning a | |
* default value if the conversion fails.</p> | |
* | |
* <p>If the string is <code>null</code>, the default value is returned.</p> | |
* | |
* <pre> | |
* NumberUtils.toLong(null, 1L) = 1L | |
* NumberUtils.toLong("", 1L) = 1L | |
* NumberUtils.toLong("1", 0L) = 1L | |
* </pre> | |
* | |
* @param str the string to convert, may be null | |
* @param defaultValue the default value | |
* @return the long represented by the string, or the default if conversion fails | |
* @since 2.1 | |
*/ | |
public static long toLong(final String str, final long defaultValue) { | |
if (str == null) { | |
return defaultValue; | |
} | |
try { | |
return Long.parseLong(str); | |
} catch (final NumberFormatException nfe) { | |
return defaultValue; | |
} | |
} | |
/** | |
* <p>Convert a <code>String</code> to a <code>float</code>, returning | |
* <code>0.0f</code> if the conversion fails.</p> | |
* | |
* <p>If the string <code>str</code> is <code>null</code>, | |
* <code>0.0f</code> is returned.</p> | |
* | |
* <pre> | |
* NumberUtils.toFloat(null) = 0.0f | |
* NumberUtils.toFloat("") = 0.0f | |
* NumberUtils.toFloat("1.5") = 1.5f | |
* </pre> | |
* | |
* @param str the string to convert, may be <code>null</code> | |
* @return the float represented by the string, or <code>0.0f</code> | |
* if conversion fails | |
* @since 2.1 | |
*/ | |
public static float toFloat(final String str) { | |
return toFloat(str, 0.0f); | |
} | |
/** | |
* <p>Convert a <code>String</code> to a <code>float</code>, returning a | |
* default value if the conversion fails.</p> | |
* | |
* <p>If the string <code>str</code> is <code>null</code>, the default | |
* value is returned.</p> | |
* | |
* <pre> | |
* NumberUtils.toFloat(null, 1.1f) = 1.0f | |
* NumberUtils.toFloat("", 1.1f) = 1.1f | |
* NumberUtils.toFloat("1.5", 0.0f) = 1.5f | |
* </pre> | |
* | |
* @param str the string to convert, may be <code>null</code> | |
* @param defaultValue the default value | |
* @return the float represented by the string, or defaultValue | |
* if conversion fails | |
* @since 2.1 | |
*/ | |
public static float toFloat(final String str, final float defaultValue) { | |
if (str == null) { | |
return defaultValue; | |
} | |
try { | |
return Float.parseFloat(str); | |
} catch (final NumberFormatException nfe) { | |
return defaultValue; | |
} | |
} | |
/** | |
* <p>Convert a <code>String</code> to a <code>double</code>, returning | |
* <code>0.0d</code> if the conversion fails.</p> | |
* | |
* <p>If the string <code>str</code> is <code>null</code>, | |
* <code>0.0d</code> is returned.</p> | |
* | |
* <pre> | |
* NumberUtils.toDouble(null) = 0.0d | |
* NumberUtils.toDouble("") = 0.0d | |
* NumberUtils.toDouble("1.5") = 1.5d | |
* </pre> | |
* | |
* @param str the string to convert, may be <code>null</code> | |
* @return the double represented by the string, or <code>0.0d</code> | |
* if conversion fails | |
* @since 2.1 | |
*/ | |
public static double toDouble(final String str) { | |
return toDouble(str, 0.0d); | |
} | |
/** | |
* <p>Convert a <code>String</code> to a <code>double</code>, returning a | |
* default value if the conversion fails.</p> | |
* | |
* <p>If the string <code>str</code> is <code>null</code>, the default | |
* value is returned.</p> | |
* | |
* <pre> | |
* NumberUtils.toDouble(null, 1.1d) = 1.1d | |
* NumberUtils.toDouble("", 1.1d) = 1.1d | |
* NumberUtils.toDouble("1.5", 0.0d) = 1.5d | |
* </pre> | |
* | |
* @param str the string to convert, may be <code>null</code> | |
* @param defaultValue the default value | |
* @return the double represented by the string, or defaultValue | |
* if conversion fails | |
* @since 2.1 | |
*/ | |
public static double toDouble(final String str, final double defaultValue) { | |
if (str == null) { | |
return defaultValue; | |
} | |
try { | |
return Double.parseDouble(str); | |
} catch (final NumberFormatException nfe) { | |
return defaultValue; | |
} | |
} | |
//----------------------------------------------------------------------- | |
/** | |
* <p>Convert a <code>String</code> to a <code>byte</code>, returning | |
* <code>zero</code> if the conversion fails.</p> | |
* | |
* <p>If the string is <code>null</code>, <code>zero</code> is returned.</p> | |
* | |
* <pre> | |
* NumberUtils.toByte(null) = 0 | |
* NumberUtils.toByte("") = 0 | |
* NumberUtils.toByte("1") = 1 | |
* </pre> | |
* | |
* @param str the string to convert, may be null | |
* @return the byte represented by the string, or <code>zero</code> if | |
* conversion fails | |
* @since 2.5 | |
*/ | |
public static byte toByte(final String str) { | |
return toByte(str, (byte) 0); | |
} | |
/** | |
* <p>Convert a <code>String</code> to a <code>byte</code>, returning a | |
* default value if the conversion fails.</p> | |
* | |
* <p>If the string is <code>null</code>, the default value is returned.</p> | |
* | |
* <pre> | |
* NumberUtils.toByte(null, 1) = 1 | |
* NumberUtils.toByte("", 1) = 1 | |
* NumberUtils.toByte("1", 0) = 1 | |
* </pre> | |
* | |
* @param str the string to convert, may be null | |
* @param defaultValue the default value | |
* @return the byte represented by the string, or the default if conversion fails | |
* @since 2.5 | |
*/ | |
public static byte toByte(final String str, final byte defaultValue) { | |
if(str == null) { | |
return defaultValue; | |
} | |
try { | |
return Byte.parseByte(str); | |
} catch (final NumberFormatException nfe) { | |
return defaultValue; | |
} | |
} | |
/** | |
* <p>Convert a <code>String</code> to a <code>short</code>, returning | |
* <code>zero</code> if the conversion fails.</p> | |
* | |
* <p>If the string is <code>null</code>, <code>zero</code> is returned.</p> | |
* | |
* <pre> | |
* NumberUtils.toShort(null) = 0 | |
* NumberUtils.toShort("") = 0 | |
* NumberUtils.toShort("1") = 1 | |
* </pre> | |
* | |
* @param str the string to convert, may be null | |
* @return the short represented by the string, or <code>zero</code> if | |
* conversion fails | |
* @since 2.5 | |
*/ | |
public static short toShort(final String str) { | |
return toShort(str, (short) 0); | |
} | |
/** | |
* <p>Convert a <code>String</code> to an <code>short</code>, returning a | |
* default value if the conversion fails.</p> | |
* | |
* <p>If the string is <code>null</code>, the default value is returned.</p> | |
* | |
* <pre> | |
* NumberUtils.toShort(null, 1) = 1 | |
* NumberUtils.toShort("", 1) = 1 | |
* NumberUtils.toShort("1", 0) = 1 | |
* </pre> | |
* | |
* @param str the string to convert, may be null | |
* @param defaultValue the default value | |
* @return the short represented by the string, or the default if conversion fails | |
* @since 2.5 | |
*/ | |
public static short toShort(final String str, final short defaultValue) { | |
if(str == null) { | |
return defaultValue; | |
} | |
try { | |
return Short.parseShort(str); | |
} catch (final NumberFormatException nfe) { | |
return defaultValue; | |
} | |
} | |
//----------------------------------------------------------------------- | |
// must handle Long, Float, Integer, Float, Short, | |
// BigDecimal, BigInteger and Byte | |
// useful methods: | |
// Byte.decode(String) | |
// Byte.valueOf(String,int radix) | |
// Byte.valueOf(String) | |
// Double.valueOf(String) | |
// Float.valueOf(String) | |
// Float.valueOf(String) | |
// Integer.valueOf(String,int radix) | |
// Integer.valueOf(String) | |
// Integer.decode(String) | |
// Integer.getInteger(String) | |
// Integer.getInteger(String,int val) | |
// Integer.getInteger(String,Integer val) | |
// Integer.valueOf(String) | |
// Double.valueOf(String) | |
// new Byte(String) | |
// Long.valueOf(String) | |
// Long.getLong(String) | |
// Long.getLong(String,int) | |
// Long.getLong(String,Integer) | |
// Long.valueOf(String,int) | |
// Long.valueOf(String) | |
// Short.valueOf(String) | |
// Short.decode(String) | |
// Short.valueOf(String,int) | |
// Short.valueOf(String) | |
// new BigDecimal(String) | |
// new BigInteger(String) | |
// new BigInteger(String,int radix) | |
// Possible inputs: | |
// 45 45.5 45E7 4.5E7 Hex Oct Binary xxxF xxxD xxxf xxxd | |
// plus minus everything. Prolly more. A lot are not separable. | |
/** | |
* <p>Turns a string value into a java.lang.Number.</p> | |
* | |
* <p>If the string starts with {@code 0x} or {@code -0x} (lower or upper case) or {@code #} or {@code -#}, it | |
* will be interpreted as a hexadecimal Integer - or Long, if the number of digits after the | |
* prefix is more than 8 - or BigInteger if there are more than 16 digits. | |
* </p> | |
* <p>Then, the value is examined for a type qualifier on the end, i.e. one of | |
* <code>'f','F','d','D','l','L'</code>. If it is found, it starts | |
* trying to create successively larger types from the type specified | |
* until one is found that can represent the value.</p> | |
* | |
* <p>If a type specifier is not found, it will check for a decimal point | |
* and then try successively larger types from <code>Integer</code> to | |
* <code>BigInteger</code> and from <code>Float</code> to | |
* <code>BigDecimal</code>.</p> | |
* | |
* <p> | |
* Integral values with a leading {@code 0} will be interpreted as octal; the returned number will | |
* be Integer, Long or BigDecimal as appropriate. | |
* </p> | |
* | |
* <p>Returns <code>null</code> if the string is <code>null</code>.</p> | |
* | |
* <p>This method does not trim the input string, i.e., strings with leading | |
* or trailing spaces will generate NumberFormatExceptions.</p> | |
* | |
* @param str String containing a number, may be null | |
* @return Number created from the string (or null if the input is null) | |
* @throws NumberFormatException if the value cannot be converted | |
*/ | |
public static Number createNumber(final String str) throws NumberFormatException { | |
if (str == null) { | |
return null; | |
} | |
if (StringUtils.isBlank(str)) { | |
throw new NumberFormatException("A blank string is not a valid number"); | |
} | |
// Need to deal with all possible hex prefixes here | |
final String[] hex_prefixes = {"0x", "0X", "-0x", "-0X", "#", "-#"}; | |
int pfxLen = 0; | |
for(final String pfx : hex_prefixes) { | |
if (str.startsWith(pfx)) { | |
pfxLen += pfx.length(); | |
break; | |
} | |
} | |
if (pfxLen > 0) { // we have a hex number | |
char firstSigDigit = 0; // strip leading zeroes | |
for(int i = pfxLen; i < str.length(); i++) { | |
firstSigDigit = str.charAt(i); | |
if (firstSigDigit == '0') { // count leading zeroes | |
pfxLen++; | |
} else { | |
break; | |
} | |
} | |
final int hexDigits = str.length() - pfxLen; | |
if (hexDigits > 16 || (hexDigits == 16 && firstSigDigit > '7')) { // too many for Long | |
return createBigInteger(str); | |
} | |
if (hexDigits > 8 || (hexDigits == 8 && firstSigDigit > '7')) { // too many for an int | |
return createLong(str); | |
} | |
return createInteger(str); | |
} | |
final char lastChar = str.charAt(str.length() - 1); | |
String mant; | |
String dec; | |
String exp; | |
final int decPos = str.indexOf('.'); | |
final int expPos = str.indexOf('e') + str.indexOf('E') + 1; // assumes both not present | |
// if both e and E are present, this is caught by the checks on expPos (which prevent IOOBE) | |
// and the parsing which will detect if e or E appear in a number due to using the wrong offset | |
int numDecimals = 0; // Check required precision (LANG-693) | |
if (decPos > -1) { // there is a decimal point | |
if (expPos > -1) { // there is an exponent | |
if (expPos < decPos || expPos > str.length()) { // prevents double exponent causing IOOBE | |
throw new NumberFormatException(str + " is not a valid number."); | |
} | |
dec = str.substring(decPos + 1, expPos); | |
} else { | |
dec = str.substring(decPos + 1); | |
} | |
mant = getMantissa(str, decPos); | |
numDecimals = dec.length(); // gets number of digits past the decimal to ensure no loss of precision for floating point numbers. | |
} else { | |
if (expPos > -1) { | |
if (expPos > str.length()) { // prevents double exponent causing IOOBE | |
throw new NumberFormatException(str + " is not a valid number."); | |
} | |
mant = getMantissa(str, expPos); | |
} else { | |
mant = getMantissa(str); | |
} | |
dec = null; | |
} | |
if (!Character.isDigit(lastChar) && lastChar != '.') { | |
if (expPos > -1 && expPos < str.length() - 1) { | |
exp = str.substring(expPos + 1, str.length() - 1); | |
} else { | |
exp = null; | |
} | |
//Requesting a specific type.. | |
final String numeric = str.substring(0, str.length() - 1); | |
final boolean allZeros = isAllZeros(mant) && isAllZeros(exp); | |
switch (lastChar) { | |
case 'l' : | |
case 'L' : | |
if (dec == null | |
&& exp == null | |
&& (numeric.charAt(0) == '-' && isDigits(numeric.substring(1)) || isDigits(numeric))) { | |
try { | |
return createLong(numeric); | |
} catch (final NumberFormatException nfe) { // NOPMD | |
// Too big for a long | |
} | |
return createBigInteger(numeric); | |
} | |
throw new NumberFormatException(str + " is not a valid number."); | |
case 'f' : | |
case 'F' : | |
try { | |
final Float f = NumberUtils.createFloat(numeric); | |
if (!(f.isInfinite() || (f.floatValue() == 0.0F && !allZeros))) { | |
//If it's too big for a float or the float value = 0 and the string | |
//has non-zeros in it, then float does not have the precision we want | |
return f; | |
} | |
} catch (final NumberFormatException nfe) { // NOPMD | |
// ignore the bad number | |
} | |
//$FALL-THROUGH$ | |
case 'd' : | |
case 'D' : | |
try { | |
final Double d = NumberUtils.createDouble(numeric); | |
if (!(d.isInfinite() || (d.floatValue() == 0.0D && !allZeros))) { | |
return d; | |
} | |
} catch (final NumberFormatException nfe) { // NOPMD | |
// ignore the bad number | |
} | |
try { | |
return createBigDecimal(numeric); | |
} catch (final NumberFormatException e) { // NOPMD | |
// ignore the bad number | |
} | |
//$FALL-THROUGH$ | |
default : | |
throw new NumberFormatException(str + " is not a valid number."); | |
} | |
} | |
//User doesn't have a preference on the return type, so let's start | |
//small and go from there... | |
if (expPos > -1 && expPos < str.length() - 1) { | |
exp = str.substring(expPos + 1, str.length()); | |
} else { | |
exp = null; | |
} | |
if (dec == null && exp == null) { // no decimal point and no exponent | |
//Must be an Integer, Long, Biginteger | |
try { | |
return createInteger(str); | |
} catch (final NumberFormatException nfe) { // NOPMD | |
// ignore the bad number | |
} | |
try { | |
return createLong(str); | |
} catch (final NumberFormatException nfe) { // NOPMD | |
// ignore the bad number | |
} | |
return createBigInteger(str); | |
} | |
//Must be a Float, Double, BigDecimal | |
final boolean allZeros = isAllZeros(mant) && isAllZeros(exp); | |
try { | |
if(numDecimals <= 7){// If number has 7 or fewer digits past the decimal point then make it a float | |
final Float f = createFloat(str); | |
if (!(f.isInfinite() || (f.floatValue() == 0.0F && !allZeros))) { | |
return f; | |
} | |
} | |
} catch (final NumberFormatException nfe) { // NOPMD | |
// ignore the bad number | |
} | |
try { | |
if(numDecimals <= 16){// If number has between 8 and 16 digits past the decimal point then make it a double | |
final Double d = createDouble(str); | |
if (!(d.isInfinite() || (d.doubleValue() == 0.0D && !allZeros))) { | |
return d; | |
} | |
} | |
} catch (final NumberFormatException nfe) { // NOPMD | |
// ignore the bad number | |
} | |
return createBigDecimal(str); | |
} | |
/** | |
* <p>Utility method for {@link #createNumber(java.lang.String)}.</p> | |
* | |
* <p>Returns mantissa of the given number.</p> | |
* | |
* @param str the string representation of the number | |
* @return mantissa of the given number | |
*/ | |
private static String getMantissa(final String str) { | |
return getMantissa(str, str.length()); | |
} | |
/** | |
* <p>Utility method for {@link #createNumber(java.lang.String)}.</p> | |
* | |
* <p>Returns mantissa of the given number.</p> | |
* | |
* @param str the string representation of the number | |
* @param stopPos the position of the exponent or decimal point | |
* @return mantissa of the given number | |
*/ | |
private static String getMantissa(final String str, final int stopPos) { | |
final char firstChar = str.charAt(0); | |
final boolean hasSign = (firstChar == '-' || firstChar == '+'); | |
return hasSign ? str.substring(1, stopPos) : str.substring(0, stopPos); | |
} | |
/** | |
* <p>Utility method for {@link #createNumber(java.lang.String)}.</p> | |
* | |
* <p>Returns <code>true</code> if s is <code>null</code>.</p> | |
* | |
* @param str the String to check | |
* @return if it is all zeros or <code>null</code> | |
*/ | |
private static boolean isAllZeros(final String str) { | |
if (str == null) { | |
return true; | |
} | |
for (int i = str.length() - 1; i >= 0; i--) { | |
if (str.charAt(i) != '0') { | |
return false; | |
} | |
} | |
return str.length() > 0; | |
} | |
//----------------------------------------------------------------------- | |
/** | |
* <p>Convert a <code>String</code> to a <code>Float</code>.</p> | |
* | |
* <p>Returns <code>null</code> if the string is <code>null</code>.</p> | |
* | |
* @param str a <code>String</code> to convert, may be null | |
* @return converted <code>Float</code> (or null if the input is null) | |
* @throws NumberFormatException if the value cannot be converted | |
*/ | |
public static Float createFloat(final String str) { | |
if (str == null) { | |
return null; | |
} | |
return Float.valueOf(str); | |
} | |
/** | |
* <p>Convert a <code>String</code> to a <code>Double</code>.</p> | |
* | |
* <p>Returns <code>null</code> if the string is <code>null</code>.</p> | |
* | |
* @param str a <code>String</code> to convert, may be null | |
* @return converted <code>Double</code> (or null if the input is null) | |
* @throws NumberFormatException if the value cannot be converted | |
*/ | |
public static Double createDouble(final String str) { | |
if (str == null) { | |
return null; | |
} | |
return Double.valueOf(str); | |
} | |
/** | |
* <p>Convert a <code>String</code> to a <code>Integer</code>, handling | |
* hex (0xhhhh) and octal (0dddd) notations. | |
* N.B. a leading zero means octal; spaces are not trimmed.</p> | |
* | |
* <p>Returns <code>null</code> if the string is <code>null</code>.</p> | |
* | |
* @param str a <code>String</code> to convert, may be null | |
* @return converted <code>Integer</code> (or null if the input is null) | |
* @throws NumberFormatException if the value cannot be converted | |
*/ | |
public static Integer createInteger(final String str) { | |
if (str == null) { | |
return null; | |
} | |
// decode() handles 0xAABD and 0777 (hex and octal) as well. | |
return Integer.decode(str); | |
} | |
/** | |
* <p>Convert a <code>String</code> to a <code>Long</code>; | |
* since 3.1 it handles hex (0Xhhhh) and octal (0ddd) notations. | |
* N.B. a leading zero means octal; spaces are not trimmed.</p> | |
* | |
* <p>Returns <code>null</code> if the string is <code>null</code>.</p> | |
* | |
* @param str a <code>String</code> to convert, may be null | |
* @return converted <code>Long</code> (or null if the input is null) | |
* @throws NumberFormatException if the value cannot be converted | |
*/ | |
public static Long createLong(final String str) { | |
if (str == null) { | |
return null; | |
} | |
return Long.decode(str); | |
} | |
/** | |
* <p>Convert a <code>String</code> to a <code>BigInteger</code>; | |
* since 3.2 it handles hex (0x or #) and octal (0) notations.</p> | |
* | |
* <p>Returns <code>null</code> if the string is <code>null</code>.</p> | |
* | |
* @param str a <code>String</code> to convert, may be null | |
* @return converted <code>BigInteger</code> (or null if the input is null) | |
* @throws NumberFormatException if the value cannot be converted | |
*/ | |
public static BigInteger createBigInteger(final String str) { | |
if (str == null) { | |
return null; | |
} | |
int pos = 0; // offset within string | |
int radix = 10; | |
boolean negate = false; // need to negate later? | |
if (str.startsWith("-")) { | |
negate = true; | |
pos = 1; | |
} | |
if (str.startsWith("0x", pos) || str.startsWith("0X", pos)) { // hex | |
radix = 16; | |
pos += 2; | |
} else if (str.startsWith("#", pos)) { // alternative hex (allowed by Long/Integer) | |
radix = 16; | |
pos ++; | |
} else if (str.startsWith("0", pos) && str.length() > pos + 1) { // octal; so long as there are additional digits | |
radix = 8; | |
pos ++; | |
} // default is to treat as decimal | |
final BigInteger value = new BigInteger(str.substring(pos), radix); | |
return negate ? value.negate() : value; | |
} | |
/** | |
* <p>Convert a <code>String</code> to a <code>BigDecimal</code>.</p> | |
* | |
* <p>Returns <code>null</code> if the string is <code>null</code>.</p> | |
* | |
* @param str a <code>String</code> to convert, may be null | |
* @return converted <code>BigDecimal</code> (or null if the input is null) | |
* @throws NumberFormatException if the value cannot be converted | |
*/ | |
public static BigDecimal createBigDecimal(final String str) { | |
if (str == null) { | |
return null; | |
} | |
// handle JDK1.3.1 bug where "" throws IndexOutOfBoundsException | |
if (StringUtils.isBlank(str)) { | |
throw new NumberFormatException("A blank string is not a valid number"); | |
} | |
if (str.trim().startsWith("--")) { | |
// this is protection for poorness in java.lang.BigDecimal. | |
// it accepts this as a legal value, but it does not appear | |
// to be in specification of class. OS X Java parses it to | |
// a wrong value. | |
throw new NumberFormatException(str + " is not a valid number."); | |
} | |
return new BigDecimal(str); | |
} | |
// Min in array | |
//-------------------------------------------------------------------- | |
/** | |
* <p>Returns the minimum value in an array.</p> | |
* | |
* @param array an array, must not be null or empty | |
* @return the minimum value in the array | |
* @throws IllegalArgumentException if <code>array</code> is <code>null</code> | |
* @throws IllegalArgumentException if <code>array</code> is empty | |
* @since 3.4 Changed signature from min(long[]) to min(long...) | |
*/ | |
public static long min(final long... array) { | |
// Validates input | |
validateArray(array); | |
// Finds and returns min | |
long min = array[0]; | |
for (int i = 1; i < array.length; i++) { | |
if (array[i] < min) { | |
min = array[i]; | |
} | |
} | |
return min; | |
} | |
/** | |
* <p>Returns the minimum value in an array.</p> | |
* | |
* @param array an array, must not be null or empty | |
* @return the minimum value in the array | |
* @throws IllegalArgumentException if <code>array</code> is <code>null</code> | |
* @throws IllegalArgumentException if <code>array</code> is empty | |
* @since 3.4 Changed signature from min(int[]) to min(int...) | |
*/ | |
public static int min(final int... array) { | |
// Validates input | |
validateArray(array); | |
// Finds and returns min | |
int min = array[0]; | |
for (int j = 1; j < array.length; j++) { | |
if (array[j] < min) { | |
min = array[j]; | |
} | |
} | |
return min; | |
} | |
/** | |
* <p>Returns the minimum value in an array.</p> | |
* | |
* @param array an array, must not be null or empty | |
* @return the minimum value in the array | |
* @throws IllegalArgumentException if <code>array</code> is <code>null</code> | |
* @throws IllegalArgumentException if <code>array</code> is empty | |
* @since 3.4 Changed signature from min(short[]) to min(short...) | |
*/ | |
public static short min(final short... array) { | |
// Validates input | |
validateArray(array); | |
// Finds and returns min | |
short min = array[0]; | |
for (int i = 1; i < array.length; i++) { | |
if (array[i] < min) { | |
min = array[i]; | |
} | |
} | |
return min; | |
} | |
/** | |
* <p>Returns the minimum value in an array.</p> | |
* | |
* @param array an array, must not be null or empty | |
* @return the minimum value in the array | |
* @throws IllegalArgumentException if <code>array</code> is <code>null</code> | |
* @throws IllegalArgumentException if <code>array</code> is empty | |
* @since 3.4 Changed signature from min(byte[]) to min(byte...) | |
*/ | |
public static byte min(final byte... array) { | |
// Validates input | |
validateArray(array); | |
// Finds and returns min | |
byte min = array[0]; | |
for (int i = 1; i < array.length; i++) { | |
if (array[i] < min) { | |
min = array[i]; | |
} | |
} | |
return min; | |
} | |
/** | |
* <p>Returns the minimum value in an array.</p> | |
* | |
* @param array an array, must not be null or empty | |
* @return the minimum value in the array | |
* @throws IllegalArgumentException if <code>array</code> is <code>null</code> | |
* @throws IllegalArgumentException if <code>array</code> is empty | |
* @see IEEE754rUtils#min(double[]) IEEE754rUtils for a version of this method that handles NaN differently | |
* @since 3.4 Changed signature from min(double[]) to min(double...) | |
*/ | |
public static double min(final double... array) { | |
// Validates input | |
validateArray(array); | |
// Finds and returns min | |
double min = array[0]; | |
for (int i = 1; i < array.length; i++) { | |
if (Double.isNaN(array[i])) { | |
return Double.NaN; | |
} | |
if (array[i] < min) { | |
min = array[i]; | |
} | |
} | |
return min; | |
} | |
/** | |
* <p>Returns the minimum value in an array.</p> | |
* | |
* @param array an array, must not be null or empty | |
* @return the minimum value in the array | |
* @throws IllegalArgumentException if <code>array</code> is <code>null</code> | |
* @throws IllegalArgumentException if <code>array</code> is empty | |
* @see IEEE754rUtils#min(float[]) IEEE754rUtils for a version of this method that handles NaN differently | |
* @since 3.4 Changed signature from min(float[]) to min(float...) | |
*/ | |
public static float min(final float... array) { | |
// Validates input | |
validateArray(array); | |
// Finds and returns min | |
float min = array[0]; | |
for (int i = 1; i < array.length; i++) { | |
if (Float.isNaN(array[i])) { | |
return Float.NaN; | |
} | |
if (array[i] < min) { | |
min = array[i]; | |
} | |
} | |
return min; | |
} | |
// Max in array | |
//-------------------------------------------------------------------- | |
/** | |
* <p>Returns the maximum value in an array.</p> | |
* | |
* @param array an array, must not be null or empty | |
* @return the maximum value in the array | |
* @throws IllegalArgumentException if <code>array</code> is <code>null</code> | |
* @throws IllegalArgumentException if <code>array</code> is empty | |
* @since 3.4 Changed signature from max(long[]) to max(long...) | |
*/ | |
public static long max(final long... array) { | |
// Validates input | |
validateArray(array); | |
// Finds and returns max | |
long max = array[0]; | |
for (int j = 1; j < array.length; j++) { | |
if (array[j] > max) { | |
max = array[j]; | |
} | |
} | |
return max; | |
} | |
/** | |
* <p>Returns the maximum value in an array.</p> | |
* | |
* @param array an array, must not be null or empty | |
* @return the maximum value in the array | |
* @throws IllegalArgumentException if <code>array</code> is <code>null</code> | |
* @throws IllegalArgumentException if <code>array</code> is empty | |
* @since 3.4 Changed signature from max(int[]) to max(int...) | |
*/ | |
public static int max(final int... array) { | |
// Validates input | |
validateArray(array); | |
// Finds and returns max | |
int max = array[0]; | |
for (int j = 1; j < array.length; j++) { | |
if (array[j] > max) { | |
max = array[j]; | |
} | |
} | |
return max; | |
} | |
/** | |
* <p>Returns the maximum value in an array.</p> | |
* | |
* @param array an array, must not be null or empty | |
* @return the maximum value in the array | |
* @throws IllegalArgumentException if <code>array</code> is <code>null</code> | |
* @throws IllegalArgumentException if <code>array</code> is empty | |
* @since 3.4 Changed signature from max(short[]) to max(short...) | |
*/ | |
public static short max(final short... array) { | |
// Validates input | |
validateArray(array); | |
// Finds and returns max | |
short max = array[0]; | |
for (int i = 1; i < array.length; i++) { | |
if (array[i] > max) { | |
max = array[i]; | |
} | |
} | |
return max; | |
} | |
/** | |
* <p>Returns the maximum value in an array.</p> | |
* | |
* @param array an array, must not be null or empty | |
* @return the maximum value in the array | |
* @throws IllegalArgumentException if <code>array</code> is <code>null</code> | |
* @throws IllegalArgumentException if <code>array</code> is empty | |
* @since 3.4 Changed signature from max(byte[]) to max(byte...) | |
*/ | |
public static byte max(final byte... array) { | |
// Validates input | |
validateArray(array); | |
// Finds and returns max | |
byte max = array[0]; | |
for (int i = 1; i < array.length; i++) { | |
if (array[i] > max) { | |
max = array[i]; | |
} | |
} | |
return max; | |
} | |
/** | |
* <p>Returns the maximum value in an array.</p> | |
* | |
* @param array an array, must not be null or empty | |
* @return the maximum value in the array | |
* @throws IllegalArgumentException if <code>array</code> is <code>null</code> | |
* @throws IllegalArgumentException if <code>array</code> is empty | |
* @see IEEE754rUtils#max(double[]) IEEE754rUtils for a version of this method that handles NaN differently | |
* @since 3.4 Changed signature from max(double[]) to max(double...) | |
*/ | |
public static double max(final double... array) { | |
// Validates input | |
validateArray(array); | |
// Finds and returns max | |
double max = array[0]; | |
for (int j = 1; j < array.length; j++) { | |
if (Double.isNaN(array[j])) { | |
return Double.NaN; | |
} | |
if (array[j] > max) { | |
max = array[j]; | |
} | |
} | |
return max; | |
} | |
/** | |
* <p>Returns the maximum value in an array.</p> | |
* | |
* @param array an array, must not be null or empty | |
* @return the maximum value in the array | |
* @throws IllegalArgumentException if <code>array</code> is <code>null</code> | |
* @throws IllegalArgumentException if <code>array</code> is empty | |
* @see IEEE754rUtils#max(float[]) IEEE754rUtils for a version of this method that handles NaN differently | |
* @since 3.4 Changed signature from max(float[]) to max(float...) | |
*/ | |
public static float max(final float... array) { | |
// Validates input | |
validateArray(array); | |
// Finds and returns max | |
float max = array[0]; | |
for (int j = 1; j < array.length; j++) { | |
if (Float.isNaN(array[j])) { | |
return Float.NaN; | |
} | |
if (array[j] > max) { | |
max = array[j]; | |
} | |
} | |
return max; | |
} | |
/** | |
* Checks if the specified array is neither null nor empty. | |
* | |
* @param array the array to check | |
* @throws IllegalArgumentException if {@code array} is either {@code null} or empty | |
*/ | |
private static void validateArray(final Object array) { | |
if (array == null) { | |
throw new IllegalArgumentException("The Array must not be null"); | |
} | |
Validate.isTrue(Array.getLength(array) != 0, "Array cannot be empty."); | |
} | |
// 3 param min | |
//----------------------------------------------------------------------- | |
/** | |
* <p>Gets the minimum of three <code>long</code> values.</p> | |
* | |
* @param a value 1 | |
* @param b value 2 | |
* @param c value 3 | |
* @return the smallest of the values | |
*/ | |
public static long min(long a, final long b, final long c) { | |
if (b < a) { | |
a = b; | |
} | |
if (c < a) { | |
a = c; | |
} | |
return a; | |
} | |
/** | |
* <p>Gets the minimum of three <code>int</code> values.</p> | |
* | |
* @param a value 1 | |
* @param b value 2 | |
* @param c value 3 | |
* @return the smallest of the values | |
*/ | |
public static int min(int a, final int b, final int c) { | |
if (b < a) { | |
a = b; | |
} | |
if (c < a) { | |
a = c; | |
} | |
return a; | |
} | |
/** | |
* <p>Gets the minimum of three <code>short</code> values.</p> | |
* | |
* @param a value 1 | |
* @param b value 2 | |
* @param c value 3 | |
* @return the smallest of the values | |
*/ | |
public static short min(short a, final short b, final short c) { | |
if (b < a) { | |
a = b; | |
} | |
if (c < a) { | |
a = c; | |
} | |
return a; | |
} | |
/** | |
* <p>Gets the minimum of three <code>byte</code> values.</p> | |
* | |
* @param a value 1 | |
* @param b value 2 | |
* @param c value 3 | |
* @return the smallest of the values | |
*/ | |
public static byte min(byte a, final byte b, final byte c) { | |
if (b < a) { | |
a = b; | |
} | |
if (c < a) { | |
a = c; | |
} | |
return a; | |
} | |
/** | |
* <p>Gets the minimum of three <code>double</code> values.</p> | |
* | |
* <p>If any value is <code>NaN</code>, <code>NaN</code> is | |
* returned. Infinity is handled.</p> | |
* | |
* @param a value 1 | |
* @param b value 2 | |
* @param c value 3 | |
* @return the smallest of the values | |
* @see IEEE754rUtils#min(double, double, double) for a version of this method that handles NaN differently | |
*/ | |
public static double min(final double a, final double b, final double c) { | |
return Math.min(Math.min(a, b), c); | |
} | |
/** | |
* <p>Gets the minimum of three <code>float</code> values.</p> | |
* | |
* <p>If any value is <code>NaN</code>, <code>NaN</code> is | |
* returned. Infinity is handled.</p> | |
* | |
* @param a value 1 | |
* @param b value 2 | |
* @param c value 3 | |
* @return the smallest of the values | |
* @see IEEE754rUtils#min(float, float, float) for a version of this method that handles NaN differently | |
*/ | |
public static float min(final float a, final float b, final float c) { | |
return Math.min(Math.min(a, b), c); | |
} | |
// 3 param max | |
//----------------------------------------------------------------------- | |
/** | |
* <p>Gets the maximum of three <code>long</code> values.</p> | |
* | |
* @param a value 1 | |
* @param b value 2 | |
* @param c value 3 | |
* @return the largest of the values | |
*/ | |
public static long max(long a, final long b, final long c) { | |
if (b > a) { | |
a = b; | |
} | |
if (c > a) { | |
a = c; | |
} | |
return a; | |
} | |
/** | |
* <p>Gets the maximum of three <code>int</code> values.</p> | |
* | |
* @param a value 1 | |
* @param b value 2 | |
* @param c value 3 | |
* @return the largest of the values | |
*/ | |
public static int max(int a, final int b, final int c) { | |
if (b > a) { | |
a = b; | |
} | |
if (c > a) { | |
a = c; | |
} | |
return a; | |
} | |
/** | |
* <p>Gets the maximum of three <code>short</code> values.</p> | |
* | |
* @param a value 1 | |
* @param b value 2 | |
* @param c value 3 | |
* @return the largest of the values | |
*/ | |
public static short max(short a, final short b, final short c) { | |
if (b > a) { | |
a = b; | |
} | |
if (c > a) { | |
a = c; | |
} | |
return a; | |
} | |
/** | |
* <p>Gets the maximum of three <code>byte</code> values.</p> | |
* | |
* @param a value 1 | |
* @param b value 2 | |
* @param c value 3 | |
* @return the largest of the values | |
*/ | |
public static byte max(byte a, final byte b, final byte c) { | |
if (b > a) { | |
a = b; | |
} | |
if (c > a) { | |
a = c; | |
} | |
return a; | |
} | |
/** | |
* <p>Gets the maximum of three <code>double</code> values.</p> | |
* | |
* <p>If any value is <code>NaN</code>, <code>NaN</code> is | |
* returned. Infinity is handled.</p> | |
* | |
* @param a value 1 | |
* @param b value 2 | |
* @param c value 3 | |
* @return the largest of the values | |
* @see IEEE754rUtils#max(double, double, double) for a version of this method that handles NaN differently | |
*/ | |
public static double max(final double a, final double b, final double c) { | |
return Math.max(Math.max(a, b), c); | |
} | |
/** | |
* <p>Gets the maximum of three <code>float</code> values.</p> | |
* | |
* <p>If any value is <code>NaN</code>, <code>NaN</code> is | |
* returned. Infinity is handled.</p> | |
* | |
* @param a value 1 | |
* @param b value 2 | |
* @param c value 3 | |
* @return the largest of the values | |
* @see IEEE754rUtils#max(float, float, float) for a version of this method that handles NaN differently | |
*/ | |
public static float max(final float a, final float b, final float c) { | |
return Math.max(Math.max(a, b), c); | |
} | |
//----------------------------------------------------------------------- | |
/** | |
* <p>Checks whether the <code>String</code> contains only | |
* digit characters.</p> | |
* | |
* <p><code>Null</code> and empty String will return | |
* <code>false</code>.</p> | |
* | |
* @param str the <code>String</code> to check | |
* @return <code>true</code> if str contains only Unicode numeric | |
*/ | |
public static boolean isDigits(final String str) { | |
return StringUtils.isNumeric(str); | |
} | |
/** | |
* <p>Checks whether the String a valid Java number.</p> | |
* | |
* <p>Valid numbers include hexadecimal marked with the <code>0x</code> or | |
* <code>0X</code> qualifier, octal numbers, scientific notation and numbers | |
* marked with a type qualifier (e.g. 123L).</p> | |
* | |
* <p>Non-hexadecimal strings beginning with a leading zero are | |
* treated as octal values. Thus the string <code>09</code> will return | |
* <code>false</code>, since <code>9</code> is not a valid octal value. | |
* However, numbers beginning with {@code 0.} are treated as decimal.</p> | |
* | |
* <p><code>null</code> and empty/blank {@code String} will return | |
* <code>false</code>.</p> | |
* | |
* @param str the <code>String</code> to check | |
* @return <code>true</code> if the string is a correctly formatted number | |
* @since 3.3 the code supports hex {@code 0Xhhh} and octal {@code 0ddd} validation | |
*/ | |
public static boolean isNumber(final String str) { | |
if (StringUtils.isEmpty(str)) { | |
return false; | |
} | |
final char[] chars = str.toCharArray(); | |
int sz = chars.length; | |
boolean hasExp = false; | |
boolean hasDecPoint = false; | |
boolean allowSigns = false; | |
boolean foundDigit = false; | |
// deal with any possible sign up front | |
final int start = (chars[0] == '-') ? 1 : 0; | |
if (sz > start + 1 && chars[start] == '0') { // leading 0 | |
if ( | |
(chars[start + 1] == 'x') || | |
(chars[start + 1] == 'X') | |
) { // leading 0x/0X | |
int i = start + 2; | |
if (i == sz) { | |
return false; // str == "0x" | |
} | |
// checking hex (it can't be anything else) | |
for (; i < chars.length; i++) { | |
if ((chars[i] < '0' || chars[i] > '9') | |
&& (chars[i] < 'a' || chars[i] > 'f') | |
&& (chars[i] < 'A' || chars[i] > 'F')) { | |
return false; | |
} | |
} | |
return true; | |
} else if (Character.isDigit(chars[start + 1])) { | |
// leading 0, but not hex, must be octal | |
int i = start + 1; | |
for (; i < chars.length; i++) { | |
if (chars[i] < '0' || chars[i] > '7') { | |
return false; | |
} | |
} | |
return true; | |
} | |
} | |
sz--; // don't want to loop to the last char, check it afterwords | |
// for type qualifiers | |
int i = start; | |
// loop to the next to last char or to the last char if we need another digit to | |
// make a valid number (e.g. chars[0..5] = "1234E") | |
while (i < sz || (i < sz + 1 && allowSigns && !foundDigit)) { | |
if (chars[i] >= '0' && chars[i] <= '9') { | |
foundDigit = true; | |
allowSigns = false; | |
} else if (chars[i] == '.') { | |
if (hasDecPoint || hasExp) { | |
// two decimal points or dec in exponent | |
return false; | |
} | |
hasDecPoint = true; | |
} else if (chars[i] == 'e' || chars[i] == 'E') { | |
// we've already taken care of hex. | |
if (hasExp) { | |
// two E's | |
return false; | |
} | |
if (!foundDigit) { | |
return false; | |
} | |
hasExp = true; | |
allowSigns = true; | |
} else if (chars[i] == '+' || chars[i] == '-') { | |
if (!allowSigns) { | |
return false; | |
} | |
allowSigns = false; | |
foundDigit = false; // we need a digit after the E | |
} else { | |
return false; | |
} | |
i++; | |
} | |
if (i < chars.length) { | |
if (chars[i] >= '0' && chars[i] <= '9') { | |
// no type qualifier, OK | |
return true; | |
} | |
if (chars[i] == 'e' || chars[i] == 'E') { | |
// can't have an E at the last byte | |
return false; | |
} | |
if (chars[i] == '.') { | |
if (hasDecPoint || hasExp) { | |
// two decimal points or dec in exponent | |
return false; | |
} | |
// single trailing decimal point after non-exponent is ok | |
return foundDigit; | |
} | |
if (!allowSigns | |
&& (chars[i] == 'd' | |
|| chars[i] == 'D' | |
|| chars[i] == 'f' | |
|| chars[i] == 'F')) { | |
return foundDigit; | |
} | |
if (chars[i] == 'l' | |
|| chars[i] == 'L') { | |
// not allowing L with an exponent or decimal point | |
return foundDigit && !hasExp && !hasDecPoint; | |
} | |
// last character is illegal | |
return false; | |
} | |
// allowSigns is true iff the val ends in 'E' | |
// found digit it to make sure weird stuff like '.' and '1E-' doesn't pass | |
return !allowSigns && foundDigit; | |
} | |
/** | |
* <p>Checks whether the given String is a parsable number.</p> | |
* | |
* <p>Parsable numbers include those Strings understood by {@link Integer#parseInt(String)}, | |
* {@link Long#parseLong(String)}, {@link Float#parseFloat(String)} or | |
* {@link Double#parseDouble(String)}. This method can be used instead of catching {@link java.text.ParseException} | |
* when calling one of those methods.</p> | |
* | |
* <p>Hexadecimal and scientific notations are <strong>not</strong> considered parsable. | |
* See {@link #isNumber(String)} on those cases.</p> | |
* | |
* <p>{@code Null} and empty String will return <code>false</code>.</p> | |
* | |
* @param str the String to check. | |
* @return {@code true} if the string is a parsable number. | |
* @since 3.4 | |
*/ | |
public static boolean isParsable(final String str) { | |
if( StringUtils.endsWith( str, "." ) ) { | |
return false; | |
} | |
if( StringUtils.startsWith( str, "-" ) ) { | |
return isDigits( StringUtils.replaceOnce( str.substring(1), ".", StringUtils.EMPTY ) ); | |
} | |
return isDigits( StringUtils.replaceOnce( str, ".", StringUtils.EMPTY ) ); | |
} | |
/** | |
* <p>Compares two {@code int} values numerically. This is the same functionality as provided in Java 7.</p> | |
* | |
* @param x the first {@code int} to compare | |
* @param y the second {@code int} to compare | |
* @return the value {@code 0} if {@code x == y}; | |
* a value less than {@code 0} if {@code x < y}; and | |
* a value greater than {@code 0} if {@code x > y} | |
* @since 3.4 | |
*/ | |
public static int compare(int x, int y) { | |
if (x == y) { | |
return 0; | |
} | |
return x < y ? -1 : 1; | |
} | |
/** | |
* <p>Compares to {@code long} values numerically. This is the same functionality as provided in Java 7.</p> | |
* | |
* @param x the first {@code long} to compare | |
* @param y the second {@code long} to compare | |
* @return the value {@code 0} if {@code x == y}; | |
* a value less than {@code 0} if {@code x < y}; and | |
* a value greater than {@code 0} if {@code x > y} | |
* @since 3.4 | |
*/ | |
public static int compare(long x, long y) { | |
if (x == y) { | |
return 0; | |
} | |
return x < y ? -1 : 1; | |
} | |
/** | |
* <p>Compares to {@code short} values numerically. This is the same functionality as provided in Java 7.</p> | |
* | |
* @param x the first {@code short} to compare | |
* @param y the second {@code short} to compare | |
* @return the value {@code 0} if {@code x == y}; | |
* a value less than {@code 0} if {@code x < y}; and | |
* a value greater than {@code 0} if {@code x > y} | |
* @since 3.4 | |
*/ | |
public static int compare(short x, short y) { | |
if (x == y) { | |
return 0; | |
} | |
return x < y ? -1 : 1; | |
} | |
/** | |
* <p>Compares two {@code byte} values numerically. This is the same functionality as provided in Java 7.</p> | |
* | |
* @param x the first {@code byte} to compare | |
* @param y the second {@code byte} to compare | |
* @return the value {@code 0} if {@code x == y}; | |
* a value less than {@code 0} if {@code x < y}; and | |
* a value greater than {@code 0} if {@code x > y} | |
* @since 3.4 | |
*/ | |
public static int compare(byte x, byte y) { | |
return x-y; | |
} | |
} |