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+/* TextField.java -- A one line text entry field
+   Copyright (C) 1999, 2002, 2004  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.awt;
+
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.awt.peer.ComponentPeer;
+import java.awt.peer.TextFieldPeer;
+import java.util.EventListener;
+
+import javax.accessibility.AccessibleContext;
+import javax.accessibility.AccessibleStateSet;
+
+/**
+  * This class implements a single line text entry field widget
+  *
+  * @author Aaron M. Renn (arenn@urbanophile.com)
+  */
+public class TextField extends TextComponent
+{
+
+/*
+ * Static Variables
+ */
+
+// Serialization constant
+private static final long serialVersionUID = -2966288784432217853L;
+
+/*************************************************************************/
+
+/*
+ * Instance Variables
+ */
+
+/**
+  * @serial The number of columns in the text entry field.
+  */
+private int columns;
+
+/**
+  * @serial The character that is echoed when doing protected input
+  */
+private char echoChar;
+
+// List of registered ActionListener's for this object.
+private ActionListener action_listeners;
+
+/*************************************************************************/
+
+/*
+ * Constructors
+ */
+
+/**
+ * Initializes a new instance of <code>TextField</code> that is empty
+ * and has one column.
+ *
+ * @exception HeadlessException If GraphicsEnvironment.isHeadless() is true,
+ */
+public
+TextField()
+{
+  this("", 1);
+}
+
+/*************************************************************************/
+
+/**
+  * Initializes a new instance of <code>TextField</code> containing
+  * the specified text.  The number of columns will be equal to the
+  * length of the text string.
+  *
+  * @param text The text to display in the field.
+  *
+  * @exception HeadlessException If GraphicsEnvironment.isHeadless() is true,
+  */
+public
+TextField(String text)
+{
+  this(text, text.length());
+}
+
+/*************************************************************************/
+
+/**
+  * Initializes a new instance of <code>TextField</code> that is empty
+  * and has the specified number of columns.
+  *
+  * @param columns The number of columns in the text field.
+  *
+  * @exception HeadlessException If GraphicsEnvironment.isHeadless() is true,
+  */
+public
+TextField(int columns)
+{
+  this("", columns);
+}
+
+/*************************************************************************/
+
+/**
+  * Initializes a new instance of <code>TextField</code> with the
+  * specified text and number of columns.
+  *
+  * @param text The text to display in the field.
+  * @param columns The number of columns in the field.
+  *
+  * @exception HeadlessException If GraphicsEnvironment.isHeadless() is true,
+  */
+public
+TextField(String text, int columns)
+{
+  super(text);
+  this.columns = columns;
+
+  if (GraphicsEnvironment.isHeadless())
+    throw new HeadlessException ();
+}
+
+/*************************************************************************/
+
+/*
+ * Instance Methods
+ */
+
+/**
+  * Returns the number of columns in the field.
+  *
+  * @return The number of columns in the field.
+  */
+public int
+getColumns()
+{
+  return(columns);
+}
+
+/*************************************************************************/
+
+/**
+  * Sets the number of columns in this field to the specified value.
+  *
+  * @param columns The new number of columns in the field.
+  *
+  * @exception IllegalArgumentException If columns is less than zero.
+  */
+public synchronized void
+setColumns(int columns)
+{
+  if (columns < 0)
+    throw new IllegalArgumentException("Value is less than zero: " +
+                                       columns);
+
+  this.columns = columns;
+  // FIXME: How to we communicate this to our peer?
+}
+
+/*************************************************************************/
+
+/**
+  * Returns the character that is echoed to the screen when a text 
+  * field is protected (such as when a password is being entered).
+  *
+  * @return The echo character for this text field.
+  */
+public char
+getEchoChar()
+{
+  return(echoChar);
+}
+
+/*************************************************************************/
+
+/**
+  * Sets the character that is echoed when protected input such as
+  * a password is displayed.
+  *
+  * @param echoChar The new echo character.
+  */
+public void
+setEchoChar(char echoChar)
+{
+  setEchoCharacter (echoChar);
+}
+
+/*************************************************************************/
+
+/**
+  * Sets the character that is echoed when protected input such as
+  * a password is displayed.
+  *
+  * @param echoChar The new echo character.
+  *
+  * @deprecated This method is deprecated in favor of 
+  * <code>setEchoChar()</code>
+  */
+public void
+setEchoCharacter(char echoChar)
+{
+  this.echoChar = echoChar;
+
+  TextFieldPeer peer = (TextFieldPeer) getPeer ();
+  if (peer != null)
+    peer.setEchoChar (echoChar);
+}
+
+/*************************************************************************/
+
+/**
+  * Tests whether or not this text field has an echo character set
+  * so that characters the user type are not echoed to the screen.
+  *
+  * @return <code>true</code> if an echo character is set,
+  * <code>false</code> otherwise.
+  */
+public boolean
+echoCharIsSet()
+{
+  if (echoChar == '\u0000')
+    return(false);
+  else
+    return(true);
+}
+
+/*************************************************************************/
+
+/**
+  * Returns the minimum size for this text field.
+  *
+  * @return The minimum size for this text field.
+  */
+public Dimension
+getMinimumSize()
+{
+  return getMinimumSize (getColumns ());
+}
+
+/*************************************************************************/
+
+/**
+  * Returns the minimum size of a text field with the specified number
+  * of columns.
+  *
+  * @param columns The number of columns to get the minimum size for.
+  */
+public Dimension
+getMinimumSize(int columns)
+{
+  return minimumSize (columns);
+}
+
+/*************************************************************************/
+
+/**
+  * Returns the minimum size for this text field.
+  *
+  * @return The minimum size for this text field.
+  *
+  * @deprecated This method is deprecated in favor of
+  * <code>getMinimumSize()</code>.
+  */
+public Dimension
+minimumSize()
+{
+  return minimumSize (getColumns ());
+}
+
+/*************************************************************************/
+
+/**
+  * Returns the minimum size of a text field with the specified number
+  * of columns.
+  *
+  * @param columns The number of columns to get the minimum size for.
+  *
+  * @deprecated This method is deprecated in favor of 
+  * <code>getMinimumSize(int)</code>.
+  */
+public Dimension
+minimumSize(int columns)
+{
+  TextFieldPeer peer = (TextFieldPeer) getPeer ();
+  if (peer == null)
+    return null; // FIXME: What do we do if there is no peer?
+
+  return peer.getMinimumSize (columns);
+}
+
+/*************************************************************************/
+
+/**
+  * Returns the preferred size for this text field.
+  *
+  * @return The preferred size for this text field.
+  */
+public Dimension
+getPreferredSize()
+{
+  return getPreferredSize (getColumns ());
+}
+
+/*************************************************************************/
+
+/**
+  * Returns the preferred size of a text field with the specified number
+  * of columns.
+  *
+  * @param columns The number of columns to get the preferred size for.
+  */
+public Dimension
+getPreferredSize(int columns)
+{
+  return preferredSize (columns);
+}
+
+/*************************************************************************/
+
+/**
+  * Returns the preferred size for this text field.
+  *
+  * @return The preferred size for this text field.
+  *
+  * @deprecated This method is deprecated in favor of 
+  * <code>getPreferredSize()</code>.
+  */
+public Dimension
+preferredSize()
+{
+  return preferredSize (getColumns ());
+}
+
+/*************************************************************************/
+
+/**
+  * Returns the preferred size of a text field with the specified number
+  * of columns.
+  *
+  * @param columns The number of columns to get the preferred size for.
+  *
+  * @deprecated This method is deprecated in favor of 
+  * <code>getPreferredSize(int)</code>.
+  */
+public Dimension
+preferredSize(int columns)
+{
+  TextFieldPeer peer = (TextFieldPeer) getPeer ();
+  if (peer == null)
+    return new Dimension (0, 0);
+
+  return peer.getPreferredSize (columns);
+}
+
+/*************************************************************************/
+
+/**
+  * Notifies this object that it should create its native peer.
+  */
+public void
+addNotify()
+{
+  if (getPeer() != null)
+    return;
+
+  setPeer((ComponentPeer)getToolkit().createTextField(this));
+}
+
+/*************************************************************************/
+
+/**
+  * Addes a new listener to the list of action listeners for this
+  * object.
+  *
+  * @param listener The listener to add to the list.
+  */
+public synchronized void
+addActionListener(ActionListener listener)
+{
+  action_listeners = AWTEventMulticaster.add(action_listeners, listener);
+
+  enableEvents(AWTEvent.ACTION_EVENT_MASK);
+}
+
+/*************************************************************************/
+
+/**
+  * Removes the specified listener from the list of action listeners
+  * for this object.
+  *
+  * @param listener The listener to remove from the list.
+  */
+public synchronized void
+removeActionListener(ActionListener listener)
+{
+  action_listeners = AWTEventMulticaster.remove(action_listeners, listener);
+}
+
+/*************************************************************************/
+
+/**
+  * Processes the specified event.  If the event is an instance of
+  * <code>ActionEvent</code> then <code>processActionEvent()</code> is
+  * called to process it, otherwise the event is sent to the
+  * superclass.
+  *
+  * @param event The event to process.
+  */
+protected void
+processEvent(AWTEvent event)
+{
+  if (event instanceof ActionEvent)
+    processActionEvent((ActionEvent)event);
+  else
+    super.processEvent(event);
+}
+
+/*************************************************************************/
+
+/**
+  * Processes an action event by calling any registered listeners.
+  * Note to subclasses: This method is not called unless action events
+  * are enabled on this object.  This will be true if any listeners
+  * are registered, or if action events were specifically enabled
+  * using <code>enableEvents()</code>.
+  * 
+  * @param event The event to process.
+  */
+protected void
+processActionEvent(ActionEvent event)
+{
+  if (action_listeners != null)
+    action_listeners.actionPerformed(event);
+}
+
+void
+dispatchEventImpl(AWTEvent e)
+{
+  if (e.id <= ActionEvent.ACTION_LAST 
+      && e.id >= ActionEvent.ACTION_FIRST
+      && (action_listeners != null 
+	  || (eventMask & AWTEvent.ACTION_EVENT_MASK) != 0))
+    processEvent(e);
+  else
+    super.dispatchEventImpl(e);
+}
+
+/*************************************************************************/
+
+/**
+  * Returns a debug string for this object.
+  *
+  * @return A debug string for this object.
+  */
+protected String
+paramString()
+{
+  return(getClass().getName() + "(columns=" + getColumns() + ",echoChar=" +
+         getEchoChar());
+}
+
+  /**
+   * Returns an array of all the objects currently registered as FooListeners
+   * upon this <code>TextField</code>. FooListeners are registered using the
+   * addFooListener method.
+   *
+   * @exception ClassCastException If listenerType doesn't specify a class or
+   * interface that implements java.util.EventListener.
+   *
+   * @since 1.3
+   */
+  public EventListener[] getListeners (Class listenerType)
+  {
+    if (listenerType == ActionListener.class)
+      return AWTEventMulticaster.getListeners (action_listeners, listenerType);
+
+    return super.getListeners (listenerType);
+  }
+
+  /**
+   * Return all ActionListeners register to this <code>TextField</code> object
+   * as an array.
+   *
+   * @since 1.4
+   */
+  public ActionListener[] getActionListeners ()
+  {
+    return (ActionListener[]) getListeners (ActionListener.class);
+  }
+
+  protected class AccessibleAWTTextField extends AccessibleAWTTextComponent
+  {
+    protected AccessibleAWTTextField()
+    {
+    }
+    
+    public AccessibleStateSet getAccessibleStateSet()
+    {
+      return super.getAccessibleStateSet();
+    }
+  }
+  
+  public AccessibleContext getAccessibleContext()
+  {
+    return new AccessibleAWTTextField();
+  }
+
+} // class TextField