org.mule.util.NumberUtils Maven / Gradle / Ivy
/*
* $Id: NumberUtils.java 20079 2010-11-05 03:14:58Z dfeist $
* --------------------------------------------------------------------------------------
* Copyright (c) MuleSoft, Inc. All rights reserved. http://www.mulesoft.com
*
* The software in this package is published under the terms of the CPAL v1.0
* license, a copy of which has been included with this distribution in the
* LICENSE.txt file.
*/
package org.mule.util;
import java.math.BigDecimal;
import java.math.BigInteger;
/**
* NumberUtils contains useful methods for manipulating numbers.
*/
// @ThreadSafe
public class NumberUtils extends org.apache.commons.lang.math.NumberUtils
{
public static final int INTEGER_ERROR = -999999999;
public static final long LONG_ERROR = -999999999;
public static final float FLOAT_ERROR = -999999999;
public static final double DOUBLE_ERROR = -999999999;
public static long toLong(Object obj)
{
if (obj == null)
{
throw new IllegalArgumentException("Unable to convert null object to long");
}
else if (obj instanceof String)
{
return toLong((String) obj);
}
else if (obj instanceof Number)
{
return ((Number) obj).longValue();
}
else
{
throw new IllegalArgumentException("Unable to convert object of type: "
+ obj.getClass().getName() + " to long.");
}
}
public static int toInt(Object obj)
{
if (obj == null)
{
throw new IllegalArgumentException("Unable to convert null object to int");
}
else if (obj instanceof String)
{
return toInt((String) obj);
}
else if (obj instanceof Number)
{
return ((Number) obj).intValue();
}
else
{
throw new IllegalArgumentException("Unable to convert object of type: "
+ obj.getClass().getName() + " to int.");
}
}
public static float toFloat(Object obj)
{
if (obj == null)
{
throw new IllegalArgumentException("Unable to convert null object to float");
}
else if (obj instanceof String)
{
return toFloat((String) obj);
}
else if (obj instanceof Number)
{
return ((Number) obj).floatValue();
}
else
{
throw new IllegalArgumentException("Unable to convert object of type: "
+ obj.getClass().getName() + " to float.");
}
}
public static double toDouble(Object obj)
{
if (obj == null)
{
throw new IllegalArgumentException("Unable to convert null object to double");
}
else if (obj instanceof String)
{
return toDouble((String) obj);
}
else if (obj instanceof Number)
{
return ((Number) obj).doubleValue();
}
else
{
throw new IllegalArgumentException("Unable to convert object of type: "
+ obj.getClass().getName() + " to double.");
}
}
public static int toInt(String str)
{
return toInt(str, INTEGER_ERROR);
}
public static long toLong(String str)
{
return toLong(str, LONG_ERROR);
}
public static float toFloat(String str)
{
return toFloat(str, FLOAT_ERROR);
}
public static double toDouble(String str)
{
return toDouble(str, DOUBLE_ERROR);
}
/*
* The following methods are from org.springframework.util.NumberUtils
*/
@SuppressWarnings("unchecked")
public static T parseNumber(String text, Class targetClass)
{
text = text.trim();
if (targetClass.equals(Byte.class))
{
return (T) Byte.valueOf(text);
}
else if (targetClass.equals(Short.class))
{
return (T) Short.valueOf(text);
}
else if (targetClass.equals(Integer.class))
{
return (T) Integer.valueOf(text);
}
else if (targetClass.equals(Long.class))
{
return (T) Long.valueOf(text);
}
else if (targetClass.equals(BigInteger.class))
{
return (T) new BigInteger(text);
}
else if (targetClass.equals(Float.class))
{
return (T) Float.valueOf(text);
}
else if (targetClass.equals(Double.class))
{
return (T) Double.valueOf(text);
}
else if (targetClass.equals(BigDecimal.class) || targetClass.equals(Number.class))
{
return (T) new BigDecimal(text);
}
else
{
throw new IllegalArgumentException("Cannot convert String [" + text + "] to target class ["
+ targetClass.getName() + "]");
}
}
@SuppressWarnings("unchecked")
public static T convertNumberToTargetClass(Number number, Class targetClass)
throws IllegalArgumentException
{
if (targetClass.isInstance(number))
{
return (T) number;
}
else if (targetClass.equals(Byte.class))
{
long value = number.longValue();
if (value < Byte.MIN_VALUE || value > Byte.MAX_VALUE)
{
raiseOverflowException(number, targetClass);
}
return (T) new Byte(number.byteValue());
}
else if (targetClass.equals(Short.class))
{
long value = number.longValue();
if (value < Short.MIN_VALUE || value > Short.MAX_VALUE)
{
raiseOverflowException(number, targetClass);
}
return (T) new Short(number.shortValue());
}
else if (targetClass.equals(Integer.class))
{
long value = number.longValue();
if (value < Integer.MIN_VALUE || value > Integer.MAX_VALUE)
{
raiseOverflowException(number, targetClass);
}
return (T) new Integer(number.intValue());
}
else if (targetClass.equals(Long.class))
{
return (T) new Long(number.longValue());
}
else if (targetClass.equals(BigInteger.class))
{
if (number instanceof BigDecimal)
{
// do not lose precision - use BigDecimal's own conversion
return (T) ((BigDecimal) number).toBigInteger();
}
else
{
// original value is not a Big* number - use standard long conversion
return (T) BigInteger.valueOf(number.longValue());
}
}
else if (targetClass.equals(Float.class))
{
return (T) new Float(number.floatValue());
}
else if (targetClass.equals(Double.class))
{
return (T) new Double(number.doubleValue());
}
else if (targetClass.equals(BigDecimal.class))
{
// always use BigDecimal(String) here to avoid unpredictability of
// BigDecimal(double)
// (see BigDecimal javadoc for details)
return (T) new BigDecimal(number.toString());
}
else
{
throw new IllegalArgumentException("Could not convert number [" + number + "] of type ["
+ number.getClass().getName() + "] to unknown target class ["
+ targetClass.getName() + "]");
}
}
/**
* Raise an overflow exception for the given number and target class.
*
* @param number the number we tried to convert
* @param targetClass the target class we tried to convert to
*/
private static void raiseOverflowException(Number number, Class targetClass)
{
throw new IllegalArgumentException("Could not convert number [" + number + "] of type ["
+ number.getClass().getName() + "] to target class ["
+ targetClass.getName() + "]: overflow");
}
}
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