/*******************************************************************************
* Copyright (c) 2014 Bruno Medeiros and other Contributors.
* 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:
* Bruno Medeiros - initial API and implementation
*******************************************************************************/
package melnorme.lang.ide.core.utils.prefs;
import org.eclipse.core.runtime.preferences.IEclipsePreferences;
/**
* A string preference that allows the null value.
*/
public class OptionalStringPreference extends StringPreference {
public OptionalStringPreference(String key, IProjectPreference<Boolean> useProjectSettings) {
super(key, null, useProjectSettings);
}
@Override
protected String getPrefValue(String savedValue) {
if(savedValue != null && savedValue.startsWith(":")) {
return savedValue.substring(1);
}
if(savedValue != null && savedValue.isEmpty()) {
return null;
}
return savedValue;
}
@Override
protected void setPrefValue(IEclipsePreferences preferences, String value) {
String savedValue = value == null ? "" : ":" + value;
super.setPrefValue(preferences, savedValue);
}
}