/* Copyright (c) 2010, Carl Burch. License information is located in the
* com.cburch.logisim.Main source code and at www.cburch.com/logisim/. */
package com.cburch.logisim.prefs;
import java.util.prefs.PreferenceChangeEvent;
import java.util.prefs.Preferences;
class PrefMonitorString extends AbstractPrefMonitor<String> {
private String dflt;
private String value;
PrefMonitorString(String name, String dflt) {
super(name);
this.dflt = dflt;
Preferences prefs = AppPreferences.getPrefs();
this.value = prefs.get(name, dflt);
prefs.addPreferenceChangeListener(this);
}
public String get() {
return value;
}
public void set(String newValue) {
String oldValue = value;
if (!isSame(oldValue, newValue)) {
value = newValue;
AppPreferences.getPrefs().put(getIdentifier(), newValue);
}
}
public void preferenceChange(PreferenceChangeEvent event) {
Preferences prefs = event.getNode();
String prop = event.getKey();
String name = getIdentifier();
if (prop.equals(name)) {
String oldValue = value;
String newValue = prefs.get(name, dflt);
if (!isSame(oldValue, newValue)) {
value = newValue;
AppPreferences.firePropertyChange(name, oldValue, newValue);
}
}
}
private static boolean isSame(String a, String b) {
return a == null ? b == null : a.equals(b);
}
}