Package com.cburch.logisim.prefs

Source Code of com.cburch.logisim.prefs.PrefMonitorDouble

/* 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 PrefMonitorDouble extends AbstractPrefMonitor<Double> {
    private double dflt;
    private double value;

    PrefMonitorDouble(String name, double dflt) {
        super(name);
        this.dflt = dflt;
        this.value = dflt;
        Preferences prefs = AppPreferences.getPrefs();
        set(Double.valueOf(prefs.getDouble(name, dflt)));
        prefs.addPreferenceChangeListener(this);
    }

    @Override
    public Double get() {
        return Double.valueOf(value);
    }

    @Override
    public void set(Double newValue) {
        double newVal = newValue.doubleValue();
        if (value != newVal) {
            AppPreferences.getPrefs().putDouble(getIdentifier(), newVal);
        }
    }

    @Override
    public void preferenceChange(PreferenceChangeEvent event) {
        Preferences prefs = event.getNode();
        String prop = event.getKey();
        String name = getIdentifier();
        if (prop.equals(name)) {
            double oldValue = value;
            double newValue = prefs.getDouble(name, dflt);
            if (newValue != oldValue) {
                value = newValue;
                AppPreferences.firePropertyChange(name,
                        Double.valueOf(oldValue), Double.valueOf(newValue));
            }
        }
    }
}
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