libjava/classpath/javax/swing/text/Document.java

/* Document.java --
   Copyright (C) 2002, 2004, 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
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General Public License for more details.

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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

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
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package javax.swing.text;

import javax.swing.event.DocumentListener;
import javax.swing.event.UndoableEditListener;

/**
 * A Document is the model that backs up all text components in Swing.
 * This interface supports different kinds of implementations, from
 * simple plain text model up to complex styled HTML or RTF models.
 */
public interface Document
{
  /**
   * The key for the property that describes the source of a document.
   */
  String StreamDescriptionProperty = "stream";

  /**
   * The key for the property that is the title of a document.
   */
  String TitleProperty = "title";

  /**
   * Adds a {@link DocumentListener} to this document.
   *
   * @param listener the DocumentListener to add
   */
  void addDocumentListener(DocumentListener listener);

  /**
   * Adds an {@link UndoableEditListener} to this document.
   *
   * @param listener the UndoableEditListener to add
   */
  void addUndoableEditListener(UndoableEditListener listener);

  /**
   * Creates a mark in the character content at the specified offset.
   *
   * @param offs the offset where to place the mark
   *
   * @return the created Position object
   *
   * @throws BadLocationException of the specified offset is not a valid
   *         position in the documents content
   */
  Position createPosition(int offs)
    throws BadLocationException;

  /**
   * Returns the default root element. Views should be using this element
   * unless other mechanisms for assigning views to element structure is
   * provided.
   *
   * @return the default root element
   */
  Element getDefaultRootElement();

  /**
   * Returns the position that marks the end of the document.
   *
   * @return the position that marks the end of the document
   */
  Position getEndPosition();

  /**
   * Returns the length of the document content.
   *
   * @return the length of the document content
   */
  int getLength();

  /**
   * Returns a document property with the specified key.
   *
   * @param key the (non-null) key for the property to fetch
   *
   * @return the property for <code>key</code> or null if no such property
   *         is stored
   */
  Object getProperty(Object key);

  /**
   * Returns the root elements of the document content.
   *
   * @return the root elements of the document content
   */
  Element[] getRootElements();

  /**
   * Returns the position that marks the beginning of the document
   * content.
   *
   * @return the start position
   */
  Position getStartPosition();

  /**
   * Returns the textual content starting at <code>offset</code> with
   * a length of <code>length</code>.
   *
   * @param offset the beginning of the text fragment to fetch
   * @param length the length of the text fragment to fetch
   *
   * @return the text fragment starting at <code>offset</code> with
   *         a length of <code>length</code>
   *
   * @throws BadLocationException if <code>offset</code> or <code>length</code>
   *         are no valid locations in the document content
   */
  String getText(int offset, int length)
    throws BadLocationException;

  /**
   * Fetch the textual content starting at <code>offset</code> with
   * a length of <code>length</code> and store it in <code>txt</code>.
   *
   * @param offset the beginning of the text fragment to fetch
   * @param length the length of the text fragment to fetch
   * @param txt the Segment where to store the text fragment
   *
   * @throws BadLocationException if <code>offset</code> or <code>length</code>
   *         are no valid locations in the document content
   */
  void getText(int offset, int length, Segment txt)
    throws BadLocationException;

  /**
   * Inserts a piece of text with an AttributeSet at the specified
   * <code>offset</code>.
   *
   * @param offset the location where to insert the content
   * @param str the textual content to insert
   * @param a the Attributes associated with the piece of text
   *
   * @throws BadLocationException if <code>offset</code>
   *         is not a valid location in the document content
   */
  void insertString(int offset, String str, AttributeSet a)
    throws BadLocationException;

  /**
   * Sets a document property.
   *
   * @param key the key of the property
   * @param value the value of the property
   */
  void putProperty(Object key, Object value);

  /**
   * Removes a piece of content.
   *
   * @param offs the location of the fragment to remove
   * @param len the length of the fragment to remove
   *
   * @throws BadLocationException if <code>offs</code> or <code>len</code>
   *         are no valid locations in the document content
   */
  void remove(int offs, int len)
    throws BadLocationException;

  /**
   * Removes a DocumentListener from this Document.
   *
   * @param listener the DocumentListener to remove
   */
  void removeDocumentListener(DocumentListener listener);

  /**
   * Removes an UndoableEditListener from this Document.
   *
   * @param listener the UndoableEditListener to remove
   */
  void removeUndoableEditListener(UndoableEditListener listener);

  /**
   * This allows the Document to be rendered safely. It is made sure that
   * the Runnable can read the document without any changes while reading.
   * The Runnable is not allowed to change the Document itself.
   *
   * @param r the Runnable that renders the Document
   */
  void render(Runnable r);
}