bundles/org.eclipse.core.databinding/src/org/eclipse/core/internal/databinding/validation/ObjectToPrimitiveValidator.java

/*******************************************************************************
 * Copyright (c) 2006, 2008 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
 *     Tom Schindl<tom.schindl@bestsolution.at> - bugfix for 217940
 *******************************************************************************/

package org.eclipse.core.internal.databinding.validation;

import org.eclipse.core.databinding.validation.IValidator;
import org.eclipse.core.databinding.validation.ValidationStatus;
import org.eclipse.core.internal.databinding.BindingMessages;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;

/**
 * @since 3.2
 *
 */
public class ObjectToPrimitiveValidator implements IValidator {

	private Class toType;

	private Class[][] primitiveMap = new Class[][] {
			{ Integer.TYPE, Integer.class }, { Short.TYPE, Short.class },
			{ Long.TYPE, Long.class }, { Double.TYPE, Double.class },
			{ Byte.TYPE, Byte.class }, { Float.TYPE, Float.class },
			{ Boolean.TYPE, Boolean.class },
			{ Character.TYPE, Character.class } };

	/**
	 * @param toType
	 */
	public ObjectToPrimitiveValidator(Class toType) {
		this.toType = toType;
	}

	protected Class getToType() {
		return this.toType;
	}

	public IStatus validate(Object value) {
		return doValidate(value);
	}

	private IStatus doValidate(Object value) {
		if (value != null) {
			if (!mapContainsValues(toType, value.getClass())) {
				return ValidationStatus.error(getClassHint());
			}
			return Status.OK_STATUS;
		}
		return ValidationStatus.error(getNullHint());
	}

	private boolean mapContainsValues(Class toType, Class fromType) {
		for (int i = 0; i < primitiveMap.length; i++) {
			if ((primitiveMap[i][0].equals(toType))
					&& (primitiveMap[i][1].equals(fromType))) {
				return true;
			}
		}
		return false;
	}

	/**
	 * @return a hint string
	 */
	public String getNullHint() {
		return BindingMessages.getString(BindingMessages.VALIDATE_CONVERSION_TO_PRIMITIVE);
	}

	/**
	 * @return a hint string
	 */
	public String getClassHint() {
		return BindingMessages
				.getString(BindingMessages.VALIDATE_CONVERSION_FROM_CLASS_TO_PRIMITIVE);
	}
}