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/*******************************************************************************
* Copyright (c) 2011 Wind River Systems, Inc. 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:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.tcf.te.ui.controls.validator;
import org.eclipse.swt.events.VerifyEvent;
/**
* Verify listener for text widgets to receive floating point numbers.
*/
public class DoubleNumberVerifyListener extends RegexVerifyListener {
/**
* Constructor.
*/
public DoubleNumberVerifyListener() {
super(NO_ATTR, null);
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.ui.controls.validator.RegexVerifyListener#verifyText(org.eclipse.swt.events.VerifyEvent)
*/
@Override
public void verifyText(VerifyEvent e) {
super.verifyText(e);
String fullText = getFullText(e);
if (e.doit && fullText != null && fullText.length() > 0) {
// append dummy digit to make it possible to enter '.' and 'e' at all
if (fullText.endsWith("-") || fullText.endsWith("+") || //$NON-NLS-1$ //$NON-NLS-2$
fullText.endsWith(".") || fullText.endsWith("e") || fullText.endsWith("E")) { //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
fullText += "0"; //$NON-NLS-1$
}
try {
Double.parseDouble(fullText);
}
catch (Exception ex) {
e.doit = false;
}
}
}
}
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