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+/* InputMethod.java -- defines an interface for complex text input
+   Copyright (C) 2002, 2005  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.im.spi;
+
+import java.awt.AWTEvent;
+import java.awt.Rectangle;
+import java.util.Locale;
+
+/**
+ * This interface supports complex text input, often for situations where
+ * the text is more complex than a keyboard will accomodate. For example,
+ * this can be used for Chinese, Japanese, and Korean, where multiple
+ * keystrokes are necessary to compose text. This could also support things
+ * like phonetic English, or reordering Thai.
+ *
+ * <p>These contexts can be loaded by the input method framework, using
+ * {@link InputContext#selectInputMethod(Locale)}.
+ *
+ * @author Eric Blake (ebb9@email.byu.edu)
+ * @since 1.3
+ * @status updated to 1.4
+ */
+public interface InputMethod
+{
+  /**
+   * Set the input method context, which ties the input method to a client
+   * component. This is called once automatically when creating the input
+   * method.
+   *
+   * @param context the context for this input method
+   * @throws NullPointerException if context is null
+   */
+  void setInputMethodContext(InputMethodContext context);
+
+  /**
+   * Sets the input locale. If the input method supports that locale, it
+   * changes its behavior to be consistent with the locale and returns true.
+   * Otherwise, it returns false. This is called by
+   * {@link InputContext#selectInputMethod(Locale)} when the user specifies
+   * a locale, or when the previously selected input method had a locale.
+   *
+   * @param locale the locale to use for input
+   * @return true if the change is successful
+   * @throws NullPointerException if locale is null
+   */
+  boolean setLocale(Locale locale);
+
+  /**
+   * Returns the current input locale, or null if none is defined. This is
+   * called by {@link InputContext#getLocale()}, or before switching input
+   * methods.
+   *
+   * @return the current input locale, or null
+   */
+  Locale getLocale();
+
+  /**
+   * Sets the allowed Unicode subsets that this input method can use. Null
+   * indicates that all characters are allowed. This is called after creation,
+   * or when switching to this input method, by
+   * {@link InputContext#setCharacterSubsets(Character.Subset[])}.
+   *
+   * @param subsets the accepted subsets for this input method, or null for all
+   */
+  void setCharacterSubsets(Character.Subset[] subsets);
+
+  /**
+   * Changes the enabled status of this input method. An enabled input method
+   * accepts incoming events for composition and control purposes, while a
+   * disabled input method ignores events (except for control purposes). This
+   * is called by {@link InputContext#setCompositionEnabled(boolean)} or when
+   * switching from an input method if the previous input method returned
+   * without exception on {@link #isCompositionEnabled()}.
+   *
+   * @param enable whether to enable this input method
+   * @throws UnsupportedOperationException if enabling/disabling is unsupported
+   * @see #isCompositionEnabled()
+   */
+  void setCompositionEnabled(boolean enable);
+
+  /**
+   * Find out if this input method is enabled. This is called by
+   * {@link InputContext#isCompositionEnabled()}, or when switching input
+   * methods via {@link InputContext#selectInputMethod(Locale)}.
+   *
+   * @return true if this input method is enabled
+   * @throws UnsupportedOperationException if enabling/disabling is unsupported
+   * @see #setCompositionEnabled(boolean)
+   */
+  boolean isCompositionEnabled();
+
+  /**
+   * Starts a reconversion operation. The input method gets its text from the
+   * client, using {@link InputMethodRequests#getSelectedText(Attribute[])}.
+   * Then the composed and committed text produced by the operation is sent
+   * back to the client using a sequence of InputMethodEvents. This is called
+   * by {@link InputContext#reconvert()}.
+   *
+   * @throws UnsupportedOperationException if reconversion is unsupported
+   */
+  void reconvert();
+
+  /**
+   * Dispatch an event to the input method. If input method support is enabled,
+   * certain events are dispatched to the input method before the client
+   * component or event listeners. The input method must either consume the
+   * event or pass it on to the component. Instances of InputEvent, including
+   * KeyEvent and MouseEvent, are given to this input method. This method is
+   * called by {@link InputContext#dispatchEvent(AWTEvent)}.
+   *
+   * @param event the event to dispatch
+   * @throws NullPointerException if event is null
+   */
+  void dispatchEvent(AWTEvent event);
+
+  /**
+   * Notify this input method of changes in the client window. This is called
+   * when notifications are enabled (see {@link
+   * InputMethodContext#enableClientWindowNotification(InputMethod, boolean)},
+   * if {@link #removeNotify(Component)} has not been called. The following
+   * situations trigger a notification:<ul>
+   * <li>The client window changes in location, size, visibility,
+   * iconification, or is closed.</li>
+   * <li>When enabling client notification (or on the first activation after
+   * enabling if no client existed at the time).</li>
+   * <li>When activating a new client after <code>removeNotify</code> was
+   * called on a previous client.</li>
+   * </ul>
+   *
+   * @param bounds the client window's current bounds, or null
+   */
+  void notifyClientWindowChange(Rectangle bounds);
+
+  /**
+   * Activate this input method for input processing. If the input method
+   * provides its own windows, it should make them open and visible at this
+   * time. This method is called when a client component receives a
+   * FOCUS_GAINED event, or when switching to this input method from another
+   * one. It is only called when the input method is inactive, assuming that
+   * new instances begin in an inactive state.
+   */
+  void activate();
+
+  /**
+   * Deactivate this input method, either temporarily or permanently for the
+   * given client. If the input method provides its own windows, it should
+   * only close those related to the current composition (such as a lookup
+   * choice panel), while leaving more persistant windows (like a control
+   * panel) open to avoid screen flicker. Before control is given to another
+   * input method, {@link #hideWindows()} will be called on this instance.
+   * This method is called when a client component receives a
+   * FOCUS_LOST event, when switching to another input method, or before
+   * {@link #removeNotify()} when the client is removed.
+   *
+   * @param isTemporary true if the focus change is temporary
+   */
+  void deactivate(boolean isTemporary);
+
+  /**
+   * Close or hide all windows opened by this input method. This is called
+   * before activating a different input method, and before calling
+   * {@link #dispose()} on this instance. It is only called when the input
+   * method is inactive.
+   */
+  void hideWindows();
+
+  /**
+   * Notify the input method that a client component has been removed from its
+   * hierarchy, or that input method support has been disabled. This is
+   * called by {@link InputContext#removeNotify()}, and only when the input
+   * method is inactive.
+   */
+  void removeNotify();
+
+  /**
+   * End any input composition currently taking place. Depending on the
+   * platform and user preferences, this may commit or delete uncommitted text,
+   * using input method events. This may be called for a variety of reasons,
+   * such as when the user moves the insertion point in the client text outside
+   * the range of the composed text, or when text is saved to file. This is
+   * called by {@link InputContext#endComposition()}, when switching to a
+   * new input method, or by {@link InputContext#selectInputMethod(Locale)}.
+   */
+  void endComposition();
+
+  /**
+   * Disposes the input method and release any resources it is using. In
+   * particular, the input method should dispose windows and close files. This
+   * is called by {@link InputContext#dispose()}, when the input method is
+   * inactive; and nothing will be called on this instance afterwards.
+   */
+  void dispose();
+
+  /**
+   * Returns a control object from this input method, or null. A control object
+   * provides method to control the behavior of this input method, as well as
+   * query information about it. The object is implementation dependent, so
+   * clients must compare the result against known input method control
+   * object types. This is called by
+   * {@link InputContext#getInputMethodControlObject()}.
+   *
+   * @return the control object, or null
+   */
+  Object getControlObject();
+} // interface InputMethod