gcc/libjava/java/awt/im/InputMethodHighlight.java

/* InputMethodHighlight.java -- highlights the current text selection
   Copyright (C) 2002, 2005  Free Software Foundation, Inc.

This file is part of GNU Classpath.

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it under the terms of the GNU General Public License as published by
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Linking this library statically or dynamically with other modules is
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permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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independent module, the terms and conditions of the license of that
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this exception to your version of the library, but you are not
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exception statement from your version. */

package java.awt.im;

import java.util.Map;

/**
 * This describes the highlight attributes of text composed in an input method.
 * The description includes an abstract level (whether text has been converted
 * yet, and whether it is selected), and a concrete level (which style
 * attributes are used in rendering). If no concrete level is defined, the
 * renderer should use
 * {@link Toolkit#mapInputMethodHighlight(InputMethodHighlight)}. An example
 * of conversion state is kana -> kanji.
 *
 * <p>Instances of this class are typically used in
 * AttributedCharacterIterators, and may be wrapped in Annotations to separate
 * text segments.
 *
 * @author Eric Blake (ebb9@email.byu.edu)
 * @see AttributedCharacterIterators
 * @see Annotation
 * @since 1.2
 * @status updated to 1.4
 */
public class InputMethodHighlight
{
  /** Raw text state (before conversion). */
  public static final int RAW_TEXT = 0;

  /** Converted text state (after conversion). */
  public static final int CONVERTED_TEXT = 1;

  /** Default do-nothing highlighting for unselected raw text. */
  public static final InputMethodHighlight UNSELECTED_RAW_TEXT_HIGHLIGHT
    = new InputMethodHighlight(false, RAW_TEXT);

  /** Default do-nothing highlighting for selected raw text. */
  public static final InputMethodHighlight SELECTED_RAW_TEXT_HIGHLIGHT
    = new InputMethodHighlight(true, RAW_TEXT);

  /** Default do-nothing highlighting for unselected converted text. */
  public static final InputMethodHighlight UNSELECTED_CONVERTED_TEXT_HIGHLIGHT
    = new InputMethodHighlight(false, CONVERTED_TEXT);

  /** Default do-nothing highlighting for selected converted text. */
  public static final InputMethodHighlight SELECTED_CONVERTED_TEXT_HIGHLIGHT
    = new InputMethodHighlight(true, CONVERTED_TEXT);

  /** Whether the highlighting applies to selected text. */
  private final boolean selected;

  /** The state of highlighted text. */
  private final int state;

  /** Any variation on the highlighting style. */
  private final int variation;

  /** The unmodifiable map of rendering styles. */
  private final Map style;

  /**
   * Create an input method highlight style, with variation 0 and null style
   * mapping.
   *
   * @param selected whether the text range is selected
   * @param state either {@link #RAW_TEXT} or {@link #CONVERTED_TEXT}
   * @throws IllegalArgumentException if state is invalid
   */
  public InputMethodHighlight(boolean selected, int state)
  {
    this(selected, state, 0, null);
  }

  /**
   * Create an input method highlight style, with null style mapping.
   *
   * @param selected whether the text range is selected
   * @param state either {@link #RAW_TEXT} or {@link #CONVERTED_TEXT}
   * @param variation the style variation
   * @throws IllegalArgumentException if state is invalid
   */
  public InputMethodHighlight(boolean selected, int state, int variation)
  {
    this(selected, state, variation, null);
  }

  /**
   * Create an input method highlight style.
   *
   * @param selected whether the text range is selected
   * @param state either {@link #RAW_TEXT} or {@link #CONVERTED_TEXT}
   * @param variation the style variation
   * @param style an unmodifiable map of rendering styles, or null
   * @throws IllegalArgumentException if state is invalid
   * @since 1.3
   */
  public InputMethodHighlight(boolean selected, int state, int variation,
                              Map style)
  {
    if (state != RAW_TEXT && state != CONVERTED_TEXT)
      throw new IllegalArgumentException();
    this.selected = selected;
    this.state = state;
    this.variation = variation;
    this.style = style;
  }

  /**
   * Return whether the highlighting applies to selected text.
   *
   * @return the selection status
   */
  public boolean isSelected()
  {
    return selected;
  }

  /**
   * Return the conversion state of the highlighted text.
   *
   * @return one of {@link #RAW_TEXT} or {@link #CONVERTED_TEXT}
   */
  public int getState()
  {
    return state;
  }

  /**
   * Return the highlighting style variation.
   *
   * @return the variation
   */
  public int getVariation()
  {
    return variation;
  }

  /**
   * Return the rendering style attributes map, or null if it should be the
   * default mapping.
   *
   * @return the style map
   * @since 1.3
   */
  public Map getStyle()
  {
    return style;
  }
} // class InputMethodHighlight