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AbstractBarChartModel.java

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 *
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 * General Public License Version 2 only ("GPL") or the Common
 * Development and Distribution License("CDDL") (collectively, the
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package org.netbeans.lib.profiler.ui.charts;

import java.util.Iterator;
import java.util.Vector;


/**
 *
 * @author Jiri Sedlacek
 */
00051 public abstract class AbstractBarChartModel implements BarChartModel {
    //~ Instance fields ----------------------------------------------------------------------------------------------------------

    private Vector listeners; // Data change listeners

    //~ Constructors -------------------------------------------------------------------------------------------------------------

    /** Creates a new instance of AbstractBarChartModel */
00059     public AbstractBarChartModel() {
    }

    //~ Methods ------------------------------------------------------------------------------------------------------------------

    public abstract String getXAxisDesc();

    // --- Abstract BarChartModel ------------------------------------------------
    public abstract String[] getXLabels();

    public abstract String getYAxisDesc();

    public abstract int[] getYValues();

    // ---------------------------------------------------------------------------

    // --- Listeners -------------------------------------------------------------

    /**
     * Adds new ChartModel listener.
     * @param listener ChartModel listener to add
     */
00081     public synchronized void addChartModelListener(ChartModelListener listener) {
        if (listeners == null) {
            listeners = new Vector();
        }

        if (!listeners.contains(listener)) {
            listeners.add(listener);
        }
    }

    /**
     * Removes ChartModel listener.
     * @param listener ChartModel listener to remove
     */
00095     public synchronized void removeChartModelListener(ChartModelListener listener) {
        if (listeners != null) {
            listeners.remove(listener);
        }
    }

    /**
     * Notifies all listeners about the data change.
     */
00104     protected void fireChartDataChanged() {
        if (listeners == null) {
            return;
        }

        Vector toNotify;

        synchronized (this) {
            toNotify = ((Vector) listeners.clone());
        }

        Iterator iterator = toNotify.iterator();

        while (iterator.hasNext()) {
            ((ChartModelListener) iterator.next()).chartDataChanged();
        }
    }

    // ---------------------------------------------------------------------------
}

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