| /******************************************************************************* |
| * Copyright (c) 2008, 2009 Borland Software Corporation and others. |
| * |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Borland Software Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.m2m.internal.qvt.oml.evaluator; |
| |
| import java.math.BigDecimal; |
| import java.math.BigInteger; |
| |
| |
| public class NumberConversions { |
| |
| private NumberConversions() { |
| super(); |
| } |
| |
| /** |
| * Converts the given value to a compatible value for assignment to the |
| * target type. |
| * |
| * @param value |
| * the value to be converted |
| * @param targetClass |
| * the target type as a potential left side of assignment |
| * @return A new value compatible to the required type if the conversion is |
| * possible. Otherwise, the original passed value is returned. |
| * Note: Non-compatible value for a conversion to the target type is returned |
| * as is |
| */ |
| public static Object convertNumber(Object value, Class<?> targetClass) { |
| if(targetClass == null) { |
| throw new IllegalArgumentException(); |
| } |
| |
| if(value == null) { |
| return value; |
| } |
| |
| Class<?> valueClass = value.getClass(); |
| if(valueClass == targetClass || (value instanceof Number == false)) { |
| return value; |
| } |
| |
| Number numVal = (Number) value; |
| if(targetClass == BigInteger.class) { |
| return new BigInteger(String.valueOf(numVal.longValue())); |
| } |
| else if(targetClass == Long.class || targetClass == long.class) { |
| return new Long(numVal.longValue()); |
| } |
| else if(targetClass == Integer.class || targetClass == int.class) { |
| return new Integer(numVal.intValue()); |
| } |
| else if(targetClass == Short.class || targetClass == short.class) { |
| return new Short(numVal.shortValue()); |
| } |
| else if(targetClass == Byte.class || targetClass == byte.class) { |
| return new Byte(numVal.byteValue()); |
| } |
| else if(targetClass == BigDecimal.class) { |
| return new BigDecimal(String.valueOf(numVal.doubleValue())); |
| } |
| else if(targetClass == Double.class || targetClass == double.class) { |
| return new Double(numVal.doubleValue()); |
| } |
| else if(targetClass == Float.class || targetClass == float.class) { |
| return new Float(numVal.floatValue()); |
| } |
| |
| return value; // NFE fill be raised in further processing |
| } |
| |
| /** |
| * Converts the given value to a compatible number value for assignment to the |
| * target type. |
| * |
| * @param value |
| * the value to be converted |
| * @param targetClass |
| * the target type as a potential left side of assignment |
| * @return A new value compatible to the required type if the conversion is |
| * possible. Otherwise, <code>null</code> is returned |
| */ |
| public static <T extends Number> T strictConvertNumber(Object value, Class<T> targetClass) { |
| Object converted = convertNumber(value, targetClass); |
| return targetClass.isInstance(converted) ? targetClass.cast(converted) : null; |
| } |
| } |