org.apache.lucene.analysis.tokenattributes.OffsetAttribute.java Source code

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Here is the source code for org.apache.lucene.analysis.tokenattributes.OffsetAttribute.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.lucene.analysis.tokenattributes;

import org.apache.lucene.util.Attribute;

/**
 * The start and end character offset of a Token. 
 */
public interface OffsetAttribute extends Attribute {
    /** 
     * Returns this Token's starting offset, the position of the first character
     * corresponding to this token in the source text.
     * <p>
     * Note that the difference between {@link #endOffset()} and <code>startOffset()</code> 
     * may not be equal to termText.length(), as the term text may have been altered by a
     * stemmer or some other filter.
     * @see #setOffset(int, int) 
     */
    public int startOffset();

    /** 
     * Set the starting and ending offset.
     * @throws IllegalArgumentException If <code>startOffset</code> or <code>endOffset</code>
     *         are negative, or if <code>startOffset</code> is greater than 
     *         <code>endOffset</code>
     * @see #startOffset()
     * @see #endOffset()
     */
    public void setOffset(int startOffset, int endOffset);

    /** 
     * Returns this Token's ending offset, one greater than the position of the
     * last character corresponding to this token in the source text. The length
     * of the token in the source text is (<code>endOffset()</code> - {@link #startOffset()}). 
     * @see #setOffset(int, int)
     */
    public int endOffset();
}