| /******************************************************************************* |
| * Copyright (c) 2007 IBM 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: |
| * IBM Corporation - initial API and implementation |
| ******************************************************************************/ |
| |
| package org.eclipse.core.internal.databinding.conversion; |
| |
| import org.eclipse.core.databinding.conversion.Converter; |
| |
| import com.ibm.icu.text.NumberFormat; |
| |
| /** |
| * Base class for number to number converters. |
| * <p> |
| * This class is thread safe. |
| * </p> |
| * |
| * @since 1.0 |
| */ |
| public abstract class NumberToNumberConverter extends Converter { |
| private NumberFormat numberFormat; |
| |
| private boolean primitive; |
| |
| private String outOfRangeMessage; |
| |
| protected NumberToNumberConverter(NumberFormat numberFormat, |
| Class fromType, Class toType) { |
| super(fromType, toType); |
| this.numberFormat = numberFormat; |
| this.primitive = toType.isPrimitive(); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.core.databinding.conversion.IConverter#convert(java.lang.Object) |
| */ |
| public final Object convert(Object fromObject) { |
| if (fromObject == null) { |
| if (primitive) { |
| throw new IllegalArgumentException( |
| "Parameter 'fromObject' cannot be null."); //$NON-NLS-1$ |
| } |
| |
| return null; |
| } |
| |
| if (!(fromObject instanceof Number)) { |
| throw new IllegalArgumentException( |
| "Parameter 'fromObject' must be of type Number."); //$NON-NLS-1$ |
| } |
| |
| Number number = (Number) fromObject; |
| Number result = doConvert(number); |
| |
| if (result != null) { |
| return result; |
| } |
| |
| synchronized (this) { |
| if (outOfRangeMessage == null) { |
| outOfRangeMessage = StringToNumberParser |
| .createOutOfRangeMessage(new Short(Short.MIN_VALUE), |
| new Short(Short.MAX_VALUE), numberFormat); |
| } |
| |
| throw new IllegalArgumentException(outOfRangeMessage); |
| } |
| } |
| |
| /** |
| * Invoked when the number should converted. |
| * |
| * @param number |
| * @return number if conversion was successfule, <code>null</code> if the |
| * number was out of range |
| */ |
| protected abstract Number doConvert(Number number); |
| |
| /** |
| * NumberFormat being used by the converter. Access to the format must be |
| * synchronized on the number format instance. |
| * |
| * @return number format |
| */ |
| public NumberFormat getNumberFormat() { |
| return numberFormat; |
| } |
| } |