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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.
 *
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package javax.accessibility;

import java.awt.Rectangle;

/**
 * The {@code AccessibleExtendedText} interface contains additional methods not
 * provided by the {@code AccessibleText} interface.
 * <p>
 * Applications can determine if an object supports the
 * {@code AccessibleExtendedText} interface by first obtaining its
 * {@code AccessibleContext} (see {@link Accessible}) and then calling the
 * {@link AccessibleContext#getAccessibleText} method of
 * {@code AccessibleContext}. If the return value is an instance of
 * {@code AccessibleExtendedText}, the object supports this interface.
 *
 * @author Peter Korn
 * @author Lynn Monsanto
 * @see Accessible
 * @see Accessible#getAccessibleContext
 * @see AccessibleContext
 * @see AccessibleContext#getAccessibleText
 * @since 1.5
 */
public interface AccessibleExtendedText {

    /**
     * Constant used to indicate that the part of the text that should be
     * retrieved is a line of text.
     *
     * @see AccessibleText#getAtIndex
     * @see AccessibleText#getAfterIndex
     * @see AccessibleText#getBeforeIndex
     */
    public static final int LINE = 4; // BugID: 4849720

    /**
     * Constant used to indicate that the part of the text that should be
     * retrieved is contiguous text with the same text attributes.
     *
     * @see AccessibleText#getAtIndex
     * @see AccessibleText#getAfterIndex
     * @see AccessibleText#getBeforeIndex
     */
    public static final int ATTRIBUTE_RUN = 5; // BugID: 4849720

    /**
     * Returns the text between two indices.
     *
     * @param  startIndex the start index in the text
     * @param  endIndex the end index in the text
     * @return the text string if the indices are valid. Otherwise, {@code null}
     *         is returned.
     */
    public String getTextRange(int startIndex, int endIndex);

    /**
     * Returns the {@code AccessibleTextSequence} at a given index.
     *
     * @param  part the {@code CHARACTER}, {@code WORD}, {@code SENTENCE},
     *         {@code LINE} or {@code ATTRIBUTE_RUN} to retrieve
     * @param  index an index within the text
     * @return an {@code AccessibleTextSequence} specifying the text if
     *         {@code part} and {@code index} are valid. Otherwise, {@code null}
     *         is returned.
     * @see AccessibleText#CHARACTER
     * @see AccessibleText#WORD
     * @see AccessibleText#SENTENCE
     */
    public AccessibleTextSequence getTextSequenceAt(int part, int index);

    /**
     * Returns the {@code AccessibleTextSequence} after a given index.
     *
     * @param  part the {@code CHARACTER}, {@code WORD}, {@code SENTENCE},
     *         {@code LINE} or {@code ATTRIBUTE_RUN} to retrieve
     * @param  index an index within the text
     * @return an {@code AccessibleTextSequence} specifying the text if
     *         {@code part} and {@code index} are valid. Otherwise, {@code null}
     *         is returned.
     * @see AccessibleText#CHARACTER
     * @see AccessibleText#WORD
     * @see AccessibleText#SENTENCE
     */
    public AccessibleTextSequence getTextSequenceAfter(int part, int index);

    /**
     * Returns the {@code AccessibleTextSequence} before a given index.
     *
     * @param  part the {@code CHARACTER}, {@code WORD}, {@code SENTENCE},
     *         {@code LINE} or {@code ATTRIBUTE_RUN} to retrieve
     * @param  index an index within the text
     * @return an {@code AccessibleTextSequence} specifying the text if
     *         {@code part} and {@code index} are valid. Otherwise, {@code null}
     *         is returned.
     * @see AccessibleText#CHARACTER
     * @see AccessibleText#WORD
     * @see AccessibleText#SENTENCE
     */
    public AccessibleTextSequence getTextSequenceBefore(int part, int index);

    /**
     * Returns the bounding rectangle of the text between two indices.
     *
     * @param  startIndex the start index in the text
     * @param  endIndex the end index in the text
     * @return the bounding rectangle of the text if the indices are valid.
     *         Otherwise, {@code null} is returned.
     */
    public Rectangle getTextBounds(int startIndex, int endIndex);
}