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Lucene example source code file (PersianNormalizer.java)
The Lucene PersianNormalizer.java source codepackage org.apache.lucene.analysis.fa; /** * 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. */ import static org.apache.lucene.analysis.util.StemmerUtil.*; /** * Normalizer for Persian. * <p> * Normalization is done in-place for efficiency, operating on a termbuffer. * <p> * Normalization is defined as: * <ul> * <li>Normalization of various heh + hamza forms and heh goal to heh. * <li>Normalization of farsi yeh and yeh barree to arabic yeh * <li>Normalization of persian keheh to arabic kaf * </ul> * */ public class PersianNormalizer { public static final char YEH = '\u064A'; public static final char FARSI_YEH = '\u06CC'; public static final char YEH_BARREE = '\u06D2'; public static final char KEHEH = '\u06A9'; public static final char KAF = '\u0643'; public static final char HAMZA_ABOVE = '\u0654'; public static final char HEH_YEH = '\u06C0'; public static final char HEH_GOAL = '\u06C1'; public static final char HEH = '\u0647'; /** * Normalize an input buffer of Persian text * * @param s input buffer * @param len length of input buffer * @return length of input buffer after normalization */ public int normalize(char s[], int len) { for (int i = 0; i < len; i++) { switch (s[i]) { case FARSI_YEH: case YEH_BARREE: s[i] = YEH; break; case KEHEH: s[i] = KAF; break; case HEH_YEH: case HEH_GOAL: s[i] = HEH; break; case HAMZA_ABOVE: // necessary for HEH + HAMZA len = delete(s, i, len); i--; break; default: break; } } return len; } } Other Lucene examples (source code examples)Here is a short list of links related to this Lucene PersianNormalizer.java source code file: |
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