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/*******************************************************************************
* Copyright (c) 2007, 2015 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)
*/
@Override
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);
}
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