commons-lang-1.0.1.jar - Apache Commons Lang
commons-lang-1.0.1.jar is the JAR file for Apache Commons Lang 1.0.1, which
provides a host of helper utilities for the java.lang API.
JAR File Size and Download Location:
File name: commons-lang-1.0.1.jar File size: 63980 bytes Date modified: 11/22/2002 Download: Apache Commons Lang Website
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⏎ org/apache/commons/lang/NumberUtils.java
package org.apache.commons.lang;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Commons", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
import java.math.BigInteger;
import java.math.BigDecimal;
/**
* Provides extra functionality for Java Number classes.
*
* @author <a href="mailto:bayard@generationjava.com">Henri Yandell</a>
* @author <a href="mailto:rand_mcneely@yahoo.com">Rand McNeely</a>
* @author <a href="mailto:scolebourne@joda.org">Stephen Colebourne</a>
* @author <a href="mailto:steve.downey@netfolio.com">Steve Downey</a>
* @version $Id: NumberUtils.java,v 1.3 2002/09/28 10:34:54 scolebourne Exp $
*/
public final class NumberUtils {
/**
* NumberUtils instances should NOT be constructed in standard programming.
* Instead, the class should be used as <code>NumberUtils.stringToInt("6");</code>.
* This constructor is public to permit tools that require a JavaBean instance
* to operate.
*/
public NumberUtils() {
}
//--------------------------------------------------------------------
/**
* Convert a String to an int, returning zero if the conversion fails
*
* @param str the string to convert
* @return the int represented by the string, or zero if conversion fails
*/
public static int stringToInt(String str) {
return stringToInt(str, 0);
}
/**
* Convert a String to an int, returning a default value if the
* conversion fails.
*
* @param str the string to convert
* @param defaultValue the default value
* @return the int represented by the string, or the default if conversion fails
*/
public static int stringToInt(String str, int defaultValue) {
try {
return Integer.parseInt(str);
} catch (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)
// new Float(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)
// new Integer(String)
// new Double(String)
// new Byte(String)
// new Long(String)
// Long.getLong(String)
// Long.getLong(String,int)
// Long.getLong(String,Integer)
// Long.valueOf(String,int)
// Long.valueOf(String)
// new Short(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.
* First, the value is examined for a type qualifier on the end
* (<code>'f','F','d','D','l','L'</code>). If it is found, it starts
* trying to create succissively larger types from the type specified
* until one is found that can hold 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 Integer to BigInteger
* and from Float to BigDecimal.
* </p>
* <p>
* If the string starts with "0x" or "-0x", it will be interpreted as a
* hexadecimal integer. Values with leading 0's will not be interpreted
* as octal.
* </p>
*
* @param val String containing a number
* @return Number created from the string
* @throws NumberFormatException if the value cannot be converted
*/
public static Number createNumber(String val) throws NumberFormatException {
if (val == null) {
return null;
}
if (val.length() == 0) {
throw new NumberFormatException("\"\" is not a valid number.");
}
if (val.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.
return null;
}
if (val.startsWith("0x") || val.startsWith("-0x")) {
return createInteger(val);
}
char lastChar = val.charAt(val.length() - 1);
String mant;
String dec;
String exp;
int decPos = val.indexOf('.');
int expPos = val.indexOf('e') + val.indexOf('E') + 1;
if (decPos > -1) {
if (expPos > -1) {
if (expPos < decPos) {
throw new NumberFormatException(val + " is not a valid number.");
}
dec = val.substring(decPos + 1, expPos);
} else {
dec = val.substring(decPos + 1);
}
mant = val.substring(0, decPos);
} else {
if (expPos > -1) {
mant = val.substring(0, expPos);
} else {
mant = val;
}
dec = null;
}
if (!Character.isDigit(lastChar)) {
if (expPos > -1 && expPos < val.length() - 1) {
exp = val.substring(expPos + 1, val.length() - 1);
} else {
exp = null;
}
//Requesting a specific type..
String numeric = val.substring(0, val.length() - 1);
boolean allZeros = isAllZeros(mant) && isAllZeros(exp);
switch (lastChar) {
case 'l' :
case 'L' :
if (dec == null
&& exp == null
&& isDigits(numeric.substring(1))
&& (numeric.charAt(0) == '-' || Character.isDigit(numeric.charAt(0)))) {
try {
return createLong(numeric);
} catch (NumberFormatException nfe) {
//Too big for a long
}
return createBigInteger(numeric);
}
throw new NumberFormatException(val + " is not a valid number.");
case 'f' :
case 'F' :
try {
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 doens't have the presision we want
return f;
}
} catch (NumberFormatException nfe) {
}
//Fall through
case 'd' :
case 'D' :
try {
Double d = NumberUtils.createDouble(numeric);
if (!(d.isInfinite() || (d.floatValue() == 0.0D && !allZeros))) {
return d;
}
} catch (NumberFormatException nfe) {
}
try {
return createBigDecimal(numeric);
} catch (NumberFormatException e) {
}
//Fall through
default :
throw new NumberFormatException(val + " is not a valid number.");
}
} else {
//User doesn't have a preference on the return type, so let's start
//small and go from there...
if (expPos > -1 && expPos < val.length() - 1) {
exp = val.substring(expPos + 1, val.length());
} else {
exp = null;
}
if (dec == null && exp == null) {
//Must be an int,long,bigint
try {
return createInteger(val);
} catch (NumberFormatException nfe) {
}
try {
return createLong(val);
} catch (NumberFormatException nfe) {
}
return createBigInteger(val);
} else {
//Must be a float,double,BigDec
boolean allZeros = isAllZeros(mant) && isAllZeros(exp);
try {
Float f = createFloat(val);
if (!(f.isInfinite() || (f.floatValue() == 0.0F && !allZeros))) {
return f;
}
} catch (NumberFormatException nfe) {
}
try {
Double d = createDouble(val);
if (!(d.isInfinite() || (d.doubleValue() == 0.0D && !allZeros))) {
return d;
}
} catch (NumberFormatException nfe) {
}
return createBigDecimal(val);
}
}
}
/**
* Utility method for createNumber. Returns true if s is null
*
* @param s the String to check
* @return if it is all zeros or null
*/
private static boolean isAllZeros(String s) {
if (s == null) {
return true;
}
for (int i = s.length() - 1; i >= 0; i--) {
if (s.charAt(i) != '0') {
return false;
}
}
return s.length() > 0;
}
//--------------------------------------------------------------------
/**
* Convert a String to a Float
*
* @param val a String to convert
* @return converted Float
* @throws NumberFormatException if the value cannot be converted
*/
public static Float createFloat(String val) {
return Float.valueOf(val);
}
/**
* Convert a String to a Double
*
* @param val a String to convert
* @return converted Double
* @throws NumberFormatException if the value cannot be converted
*/
public static Double createDouble(String val) {
return Double.valueOf(val);
}
/**
* Convert a String to a Integer, handling hex and
* octal notations.
*
* @param val a String to convert
* @return converted Integer
* @throws NumberFormatException if the value cannot be converted
*/
public static Integer createInteger(String val) {
// decode() handles 0xAABD and 0777 (hex and octal) as well.
return Integer.decode(val);
}
/**
* Convert a String to a Long
*
* @param val a String to convert
* @return converted Long
* @throws NumberFormatException if the value cannot be converted
*/
public static Long createLong(String val) {
return Long.valueOf(val);
}
/**
* Convert a String to a BigInteger
*
* @param val a String to convert
* @return converted BigInteger
* @throws NumberFormatException if the value cannot be converted
*/
public static BigInteger createBigInteger(String val) {
BigInteger bi = new BigInteger(val);
return bi;
}
/**
* Convert a String to a BigDecimal
*
* @param val a String to convert
* @return converted BigDecimal
* @throws NumberFormatException if the value cannot be converted
*/
public static BigDecimal createBigDecimal(String val) {
BigDecimal bd = new BigDecimal(val);
return bd;
}
//--------------------------------------------------------------------
/**
* Gets the minimum of three long values.
*
* @param a value 1
* @param b value 2
* @param c value 3
* @return the largest of the values
*/
public static long minimum(long a, long b, long c) {
if (b < a) {
a = b;
}
if (c < a) {
a = c;
}
return a;
}
/**
* Gets the minimum of three int values.
*
* @param a value 1
* @param b value 2
* @param c value 3
* @return the largest of the values
*/
public static int minimum(int a, int b, int c) {
if (b < a) {
a = b;
}
if (c < a) {
a = c;
}
return a;
}
/**
* Gets the maximum of three long values.
*
* @param a value 1
* @param b value 2
* @param c value 3
* @return the largest of the values
*/
public static long maximum(long a, long b, long c) {
if (b > a) {
a = b;
}
if (c > a) {
a = c;
}
return a;
}
/**
* Gets the maximum of three int values.
*
* @param a value 1
* @param b value 2
* @param c value 3
* @return the largest of the values
*/
public static int maximum(int a, int b, int c) {
if (b > a) {
a = b;
}
if (c > a) {
a = c;
}
return a;
}
//--------------------------------------------------------------------
/**
* Compares two doubles for order.
* <p>
* This method is more comprhensive than the standard Java greater than,
* less than and equals operators.
* It returns -1 if the first value is less than the second.
* It returns +1 if the first value is greater than the second.
* It returns 0 if the values are equal.
* <p>
* The ordering is as follows, largest to smallest:
* <ul>
* <li>NaN
* <li>Positive infinity
* <li>Maximum double
* <li>Normal positve numbers
* <li>+0.0
* <li>-0.0
* <li>Normal negative numbers
* <li>Minimum double (-Double.MAX_VALUE)
* <li>Negative infinity
* </ul>
* Comparing NaN with NaN will return 0.
*
* @param lhs the first double
* @param rhs the second double
* @return -1 if lhs is less, +1 if greater, 0 if equal to rhs
*/
public static int compare(double lhs, double rhs) {
if (lhs < rhs) {
return -1;
}
if (lhs > rhs) {
return +1;
}
// Need to compare bits to handle 0.0 == -0.0 being true
// compare should put -0.0 < +0.0
// Two NaNs are also == for compare purposes
// where NaN == NaN is false
long lhsBits = Double.doubleToLongBits(lhs);
long rhsBits = Double.doubleToLongBits(rhs);
if (lhsBits == rhsBits) {
return 0;
}
// Something exotic! A comparison to NaN or 0.0 vs -0.0
// Fortunately NaN's long is > than everything else
// Also negzeros bits < poszero
// NAN: 9221120237041090560
// MAX: 9218868437227405311
// NEGZERO: -9223372036854775808
if (lhsBits < rhsBits) {
return -1;
} else {
return +1;
}
}
/**
* Compares two floats for order.
* <p>
* This method is more comprhensive than the standard Java greater than,
* less than and equals operators.
* It returns -1 if the first value is less than the second.
* It returns +1 if the first value is greater than the second.
* It returns 0 if the values are equal.
* <p>
* The ordering is as follows, largest to smallest:
* <ul>
* <li>NaN
* <li>Positive infinity
* <li>Maximum float
* <li>Normal positve numbers
* <li>+0.0
* <li>-0.0
* <li>Normal negative numbers
* <li>Minimum float (-Float.MAX_VALUE)
* <li>Negative infinity
* </ul>
* Comparing NaN with NaN will return 0.
*
* @param lhs the first float
* @param rhs the second float
* @return -1 if lhs is less, +1 if greater, 0 if equal to rhs
*/
public static int compare(float lhs, float rhs) {
if (lhs < rhs) {
return -1;
}
if (lhs > rhs) {
return +1;
}
//Need to compare bits to handle 0.0 == -0.0 being true
// compare should put -0.0 < +0.0
// Two NaNs are also == for compare purposes
// where NaN == NaN is false
int lhsBits = Float.floatToIntBits(lhs);
int rhsBits = Float.floatToIntBits(rhs);
if (lhsBits == rhsBits) {
return 0;
}
//Something exotic! A comparison to NaN or 0.0 vs -0.0
//Fortunately NaN's int is > than everything else
//Also negzeros bits < poszero
//NAN: 2143289344
//MAX: 2139095039
//NEGZERO: -2147483648
if (lhsBits < rhsBits) {
return -1;
} else {
return +1;
}
}
//--------------------------------------------------------------------
/**
* Checks whether the String contains only digit characters.
* Null and blank string will return false.
*
* @param str the string to check
* @return boolean contains only unicode numeric
*/
public static boolean isDigits(String str) {
if ((str == null) || (str.length() == 0)) {
return false;
}
for (int i = 0; i < str.length(); i++) {
if (!Character.isDigit(str.charAt(i))) {
return false;
}
}
return true;
}
/**
* <p>
* Checks whether the String a valid Java number.
* Valid numbers include hexadecimal marked with the "0x" qualifier,
* scientific notation and numbers marked with a type qualifier (e.g. 123L).
* </p>
* <p>
* Null and blank string will return false.
* </p>
*
* @param str the string to check
* @return true if the string is a correctly formatted number
*/
public static boolean isNumber(String str) {
if ((str == null) || (str.length() == 0)) {
return false;
}
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
int start = (chars[0] == '-') ? 1 : 0;
if (sz > start + 1) {
if (chars[start] == '0' && chars[start + 1] == 'x') {
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;
}
}
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 (!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 exponoent
return foundDigit && !hasExp;
}
}
//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;
}
}
⏎ org/apache/commons/lang/NumberUtils.java
⇒ Using commons-lang3.jar in Java Programs
⇐ commons-lang-2.6.jar - Apache Commons Lang
2017-04-15, 18801👍, 0💬
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