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Java example source code file (DocumentEvent.java)

This example Java source code file (DocumentEvent.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

change, document, documentevent, element, elementchange, eventtype, insert, remove, string, text, undo

The DocumentEvent.java Java example source code

/*
 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package javax.swing.event;

import javax.swing.undo.*;
import javax.swing.text.*;

/**
 * Interface for document change notifications.  This provides
 * detailed information to Document observers about how the
 * Document changed.  It provides high level information such
 * as type of change and where it occurred, as well as the more
 * detailed structural changes (What Elements were inserted and
 * removed).
 *
 * @author  Timothy Prinzing
 * @see javax.swing.text.Document
 * @see DocumentListener
 */
public interface DocumentEvent {

    /**
     * Returns the offset within the document of the start
     * of the change.
     *
     * @return the offset >= 0
     */
    public int getOffset();

    /**
     * Returns the length of the change.
     *
     * @return the length >= 0
     */
    public int getLength();

    /**
     * Gets the document that sourced the change event.
     *
     * @return the document
     */
    public Document getDocument();

    /**
     * Gets the type of event.
     *
     * @return the type
     */
    public EventType getType();

    /**
     * Gets the change information for the given element.
     * The change information describes what elements were
     * added and removed and the location.  If there were
     * no changes, null is returned.
     * <p>
     * This method is for observers to discover the structural
     * changes that were made.  This means that only elements
     * that existed prior to the mutation (and still exist after
     * the mutation) need to have ElementChange records.
     * The changes made available need not be recursive.
     * <p>
     * For example, if the an element is removed from it's
     * parent, this method should report that the parent
     * changed and provide an ElementChange implementation
     * that describes the change to the parent.  If the
     * child element removed had children, these elements
     * do not need to be reported as removed.
     * <p>
     * If an child element is insert into a parent element,
     * the parent element should report a change.  If the
     * child element also had elements inserted into it
     * (grandchildren to the parent) these elements need
     * not report change.
     *
     * @param elem the element
     * @return the change information, or null if the
     *   element was not modified
     */
    public ElementChange getChange(Element elem);

    /**
     * Enumeration for document event types
     */
    public static final class EventType {

        private EventType(String s) {
            typeString = s;
        }

        /**
         * Insert type.
         */
        public static final EventType INSERT = new EventType("INSERT");

        /**
         * Remove type.
         */
        public static final EventType REMOVE = new EventType("REMOVE");

        /**
         * Change type.
         */
        public static final EventType CHANGE = new EventType("CHANGE");

        /**
         * Converts the type to a string.
         *
         * @return the string
         */
        public String toString() {
            return typeString;
        }

        private String typeString;
    }

    /**
     * Describes changes made to a specific element.
     */
    public interface ElementChange {

        /**
         * Returns the element represented.  This is the element
         * that was changed.
         *
         * @return the element
         */
        public Element getElement();

        /**
         * Fetches the index within the element represented.
         * This is the location that children were added
         * and/or removed.
         *
         * @return the index >= 0
         */
        public int getIndex();

        /**
         * Gets the child elements that were removed from the
         * given parent element.  The element array returned is
         * sorted in the order that the elements used to lie in
         * the document, and must be contiguous.
         *
         * @return the child elements
         */
        public Element[] getChildrenRemoved();

        /**
         * Gets the child elements that were added to the given
         * parent element.  The element array returned is in the
         * order that the elements lie in the document, and must
         * be contiguous.
         *
         * @return the child elements
         */
        public Element[] getChildrenAdded();

    }
}

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