--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.core.databinding/src/org/eclipse/core/internal/databinding/conversion/NumberToNumberConverter.d	Tue Apr 14 11:35:29 2009 +0200
@@ -0,0 +1,98 @@
+/*******************************************************************************
+ * 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
+ ******************************************************************************/
+
+module org.eclipse.core.internal.databinding.conversion.NumberToNumberConverter;
+
+import java.lang.all;
+
+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 : Converter {
+    private NumberFormat numberFormat;
+
+    private bool primitive;
+
+    private String outOfRangeMessage;
+
+    protected this(NumberFormat numberFormat,
+            ClassInfo fromType, ClassInfo 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 is null) {
+            if (primitive) {
+                throw new IllegalArgumentException(
+                        "Parameter 'fromObject' cannot be null."); //$NON-NLS-1$    
+            }
+
+            return null;
+        }
+
+        if (!( null !is cast(Number)fromObject )) {
+            throw new IllegalArgumentException(
+                    "Parameter 'fromObject' must be of type Number."); //$NON-NLS-1$
+        }
+
+        Number number = cast(Number) fromObject;
+        Number result = doConvert(number);
+
+        if (result !is null) {
+            return result;
+        }
+
+        synchronized (this) {
+            if (outOfRangeMessage is null) {
+                outOfRangeMessage = StringToNumberParser
+                        .createOutOfRangeMessage(new Shortcast(Short.MIN_VALUE),
+                                new Shortcast(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;
+    }
+}