| /******************************************************************************* |
| * 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.validation; |
| |
| import org.eclipse.core.databinding.validation.IValidator; |
| import org.eclipse.core.databinding.validation.ValidationStatus; |
| import org.eclipse.core.internal.databinding.conversion.StringToNumberParser; |
| import org.eclipse.core.internal.databinding.conversion.StringToNumberParser.ParseResult; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Status; |
| |
| /** |
| * Validates a number that is to be converted by a {@link NumberFormatConverter} |
| * . Validation is comprised of parsing the String and range checks. |
| * |
| * @since 1.0 |
| */ |
| public abstract class AbstractStringToNumberValidator implements |
| IValidator<Object> { |
| private final NumberFormatConverter converter; |
| private final boolean toPrimitive; |
| |
| private final Number min; |
| private final Number max; |
| |
| private String outOfRangeMessage; |
| |
| /** |
| * Constructs a new instance. |
| * |
| * @param converter |
| * converter and thus formatter to be used in validation |
| * @param min |
| * minimum value, used for reporting a range error to the user |
| * @param max |
| * maximum value, used for reporting a range error to the user |
| */ |
| protected AbstractStringToNumberValidator(NumberFormatConverter converter, |
| Number min, Number max) { |
| this.converter = converter; |
| this.min = min; |
| this.max = max; |
| |
| if (converter.getToType() instanceof Class) { |
| Class<?> clazz = (Class<?>) converter.getToType(); |
| toPrimitive = clazz.isPrimitive(); |
| } else { |
| toPrimitive = false; |
| } |
| } |
| |
| /** |
| * Validates the provided <code>value</code>. An error status is returned |
| * if: |
| * <ul> |
| * <li>The value cannot be parsed.</li> |
| * <li>The value is out of range.</li> |
| * </ul> |
| * |
| * @see org.eclipse.core.databinding.validation.IValidator#validate(java.lang.Object) |
| */ |
| public final IStatus validate(Object value) { |
| ParseResult result = StringToNumberParser.parse(value, |
| converter.getNumberFormat(), toPrimitive); |
| |
| if (result.getNumber() != null) { |
| if (!isInRange(result.getNumber())) { |
| if (outOfRangeMessage == null) { |
| outOfRangeMessage = StringToNumberParser |
| .createOutOfRangeMessage(min, max, |
| converter.getNumberFormat()); |
| } |
| |
| return ValidationStatus.error(outOfRangeMessage); |
| } |
| } else if (result.getPosition() != null) { |
| String parseErrorMessage = StringToNumberParser |
| .createParseErrorMessage((String) value, |
| result.getPosition()); |
| |
| return ValidationStatus.error(parseErrorMessage); |
| } |
| |
| return Status.OK_STATUS; |
| } |
| |
| /** |
| * Invoked by {@link #validate(Object)} when the range is to be validated. |
| * |
| * @param number |
| * @return <code>true</code> if in range |
| */ |
| protected abstract boolean isInRange(Number number); |
| } |