/*
 *                 Sun Public License Notice
 * 
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 * 
 * The Original Code is NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2003 Sun
 * Microsystems, Inc. All Rights Reserved.
 */
/*
 * ReusablePropertyModel.java
 *
 * Created on February 6, 2003, 5:12 PM
 */

package org.openide.explorer.propertysheet;
import java.beans.PropertyEditor;
import javax.swing.SwingUtilities;
import org.openide.ErrorManager;
import org.openide.nodes.Node.Property;
import org.openide.nodes.Node;
/** A reconfigurable property model for use by the rendering
 *  infrastructure, to avoid allocating memory while painting.
 *  Contains two static fields, PROPERTY and NODE which 
 *  set the node and property this model acts as an interface to.

 *  This class is not thread safe.  It assumes that it will
 *  only be called from the AWT thread, since it is used in painting
 *  infrastructure.  If property misrendering occurs, run NetBeans
 *  with the argument -J-Dnetbeans.reusable.strictthreads=true
 *  and exceptions will be thrown if any method is called from off the
 *  AWT thread.
 *
 * @author  Tim Boudreau
 */
class ReusablePropertyModel implements ExPropertyModel {
    
    private transient Property PROPERTY=null;
    static final boolean DEBUG = Boolean.getBoolean ("netbeans.reusable.strictthreads");
    private final ReusablePropertyEnv env;
    /** Creates a new instance of ReusablePropertyModel */
    public ReusablePropertyModel(ReusablePropertyEnv env) {
        this.env = env;
        env.setReusablePropertyModel(this);
    }

    void clear() {
        PROPERTY = null;
    }

    /** Does nothing - if a property changes, the sheet will get notification
     *  and the model will be reconfigured with the new value and re-rendered */
    public void addPropertyChangeListener(java.beans.PropertyChangeListener l) {
    }

    /** Does nothing - if a property changes, the sheet will get notification
     *  and the model will be reconfigured with the new value and re-rendered */
    public void removePropertyChangeListener(java.beans.PropertyChangeListener l) {
    }
    
    public PropertyEditor getPropertyEditor () {
        return PropUtils.getPropertyEditor (getProperty());
    }
    
    public Class getPropertyEditorClass() {
        if (DEBUG) checkThread();
        return getPropertyEditor().getClass();
    }
    
    public Class getPropertyType() {
        if (DEBUG) checkThread();
        return getProperty().getValueType();
    }
    
    public Object getValue() throws java.lang.reflect.InvocationTargetException {
        if (DEBUG) checkThread();
        try {
            return getProperty().getValue();
        } catch (IllegalAccessException iae) {
            ErrorManager.getDefault().notify(iae);
        }
        return null;
    }
    
    public void setValue(Object v) throws java.lang.reflect.InvocationTargetException {
        if (DEBUG) checkThread();
        try {
            getProperty().setValue (v);
        } catch (IllegalAccessException iae) {
            ErrorManager.getDefault().notify(iae);
        }
    }
    
    public Object[] getBeans() {
        if (DEBUG) checkThread();
        if (env.getNode() instanceof ProxyNode)
            return ((ProxyNode) env.getNode()).getOriginalNodes();
        else
            return new Object[] { env.getNode() };
    }
    
    public java.beans.FeatureDescriptor getFeatureDescriptor() {
        if (DEBUG) checkThread();
        return getProperty();
    }
    
    /** Ensure we're really running on the AWT thread, otherwise bad things can
     *  happen.  */
    static void checkThread () {
        if (SwingUtilities.isEventDispatchThread() == false)
            throw new IllegalStateException ("Reusable property model accessed from off the AWT thread.");
    }

    public Node.Property getProperty() {
        return PROPERTY;
    }

    public void setProperty(Node.Property PROPERTY) {
        this.PROPERTY = PROPERTY;
    }
}