--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.core.databinding/src/org/eclipse/core/internal/databinding/validation/NumberToNumberValidator.d	Tue Apr 14 11:35:29 2009 +0200
@@ -0,0 +1,101 @@
+/*******************************************************************************
+ * 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.validation.NumberToNumberValidator;
+
+import java.lang.all;
+
+import org.eclipse.core.databinding.validation.IValidator;
+import org.eclipse.core.databinding.validation.ValidationStatus;
+import org.eclipse.core.internal.databinding.conversion.NumberToNumberConverter;
+import org.eclipse.core.internal.databinding.conversion.StringToNumberParser;
+import org.eclipse.core.runtime.IStatus;
+import org.eclipse.core.runtime.Status;
+
+/**
+ * Base class for validators that validate if a Number can fit in another Number type.
+ * <p>
+ * Class is thread safe.
+ * </p>
+ * 
+ * @since 1.0
+ */
+public abstract class NumberToNumberValidator : IValidator {
+    private final NumberToNumberConverter converter;
+
+    private final Number min;
+
+    private final Number max;
+
+    private String outOfRangeMessage;
+
+    private final bool primitive;
+
+    /**
+     * @param converter
+     * @param min
+     *            can be <code>null</code>
+     * @param max
+     *            can be <code>null</code>
+     */
+    protected this(NumberToNumberConverter converter,
+            Number min, Number max) {
+        this.converter = converter;
+        this.min = min;
+        this.max = max;
+
+        primitive = (cast(ClassInfo) converter.getToType()).isPrimitive();
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.eclipse.core.databinding.validation.IValidator#validate(java.lang.Object)
+     */
+    public final IStatus validate(Object value) {
+        if (value is null) {
+            if (primitive) {
+                throw new IllegalArgumentException(
+                        "Parameter 'value' cannot be null."); //$NON-NLS-1$
+            }
+
+            return Status.OK_STATUS;
+        }
+
+        if (!( null !is cast(Number)value )) {
+            throw new IllegalArgumentException(
+                    "Parameter 'value' is not of type Number."); //$NON-NLS-1$
+        }
+
+        Number number = cast(Number) value;
+        if (inRange(number)) {
+            return Status.OK_STATUS;
+        }
+
+        synchronized (this) {
+            if (outOfRangeMessage is null && min !is null && max !is null) {
+                outOfRangeMessage = StringToNumberParser
+                        .createOutOfRangeMessage(min, max, converter
+                                .getNumberFormat());
+            }
+
+            return ValidationStatus.error(outOfRangeMessage);
+        }
+    }
+
+    /**
+     * Invoked to determine if the value is in range.
+     * 
+     * @param number
+     * @return <code>true</code> if in range
+     */
+    protected abstract bool inRange(Number number);
+}