| /* |
| * 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; |
| |
| /** |
| * Determines the position of this token relative to the previous Token in a TokenStream, used in |
| * phrase searching. |
| * |
| * <p>The default value is one. |
| * |
| * <p>Some common uses for this are: |
| * |
| * <ul> |
| * <li>Set it to zero to put multiple terms in the same position. This is useful if, e.g., a word |
| * has multiple stems. Searches for phrases including either stem will match. In this case, |
| * all but the first stem's increment should be set to zero: the increment of the first |
| * instance should be one. Repeating a token with an increment of zero can also be used to |
| * boost the scores of matches on that token. |
| * <li>Set it to values greater than one to inhibit exact phrase matches. If, for example, one |
| * does not want phrases to match across removed stop words, then one could build a stop word |
| * filter that removes stop words and also sets the increment to the number of stop words |
| * removed before each non-stop word. Then exact phrase queries will only match when the terms |
| * occur with no intervening stop words. |
| * </ul> |
| * |
| * @see org.apache.lucene.index.PostingsEnum |
| */ |
| public interface PositionIncrementAttribute extends Attribute { |
| /** |
| * Set the position increment. The default value is one. |
| * |
| * @param positionIncrement the distance from the prior term |
| * @throws IllegalArgumentException if <code>positionIncrement</code> is negative. |
| * @see #getPositionIncrement() |
| */ |
| public void setPositionIncrement(int positionIncrement); |
| |
| /** |
| * Returns the position increment of this Token. |
| * |
| * @see #setPositionIncrement(int) |
| */ |
| public int getPositionIncrement(); |
| } |