/*
 * Copyright (c) 1995, 2007, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */
package java.awt;

import javax.accessibility.*;

/**
 * <code>Panel</code> is the simplest container class. A panel
 * provides space in which an application can attach any other
 * component, including other panels.
 * <p>
 * The default layout manager for a panel is the
 * <code>FlowLayout</code> layout manager.
 *
 * @author Sami Shaio
 * @see java.awt.FlowLayout
 * @since JDK1.0
 */
public class Panel extends Container implements Accessible {
 private static final String base = "panel";
 private static int nameCounter = 0;

 /*
 * JDK 1.1 serialVersionUID
 */
 private static final long serialVersionUID = -2728009084054400034L;

 /**
 * Creates a new panel using the default layout manager.
 * The default layout manager for all panels is the
 * <code>FlowLayout</code> class.
 */
 public Panel() {
 this(new FlowLayout());
 }

 /**
 * Creates a new panel with the specified layout manager.
 * @param layout the layout manager for this panel.
 * @since JDK1.1
 */
 public Panel(LayoutManager layout) {
 setLayout(layout);
 }

 /**
 * Construct a name for this component. Called by getName() when the
 * name is null.
 */
 String constructComponentName() {
 synchronized (Panel.class) {
 return base + nameCounter++;
 }
 }

 /**
 * Creates the Panel's peer. The peer allows you to modify the
 * appearance of the panel without changing its functionality.
 */

 public void addNotify() {
 synchronized (getTreeLock()) {
 if (peer == null)
 peer = getToolkit().createPanel(this);
 super.addNotify();
 }
 }

/////////////////
// Accessibility support
////////////////

 /**
 * Gets the AccessibleContext associated with this Panel.
 * For panels, the AccessibleContext takes the form of an
 * AccessibleAWTPanel.
 * A new AccessibleAWTPanel instance is created if necessary.
 *
 * @return an AccessibleAWTPanel that serves as the
 * AccessibleContext of this Panel
 * @since 1.3
 */
 public AccessibleContext getAccessibleContext() {
 if (accessibleContext == null) {
 accessibleContext = new AccessibleAWTPanel();
 }
 return accessibleContext;
 }

 /**
 * This class implements accessibility support for the
 * <code>Panel</code> class. It provides an implementation of the
 * Java Accessibility API appropriate to panel user-interface elements.
 * @since 1.3
 */
 protected class AccessibleAWTPanel extends AccessibleAWTContainer {

 private static final long serialVersionUID = -6409552226660031050L;

 /**
 * Get the role of this object.
 *
 * @return an instance of AccessibleRole describing the role of the
 * object
 */
 public AccessibleRole getAccessibleRole() {
 return AccessibleRole.PANEL;
 }
 }

}