- SOLR-307: Added Factories for NGram Filters.

git-svn-id: https://svn.apache.org/repos/asf/lucene/solr/trunk@557622 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Otis Gospodnetic 2007-07-19 13:45:12 +00:00
parent 3c641fc63a
commit efae9eccc7
3 changed files with 108 additions and 1 deletions

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@ -103,7 +103,10 @@ New Features
17. SOLR-248: Added CapitalizationFilterFactory that creates tokens with
normalized capitalization. This filter is useful for facet display,
but will not work with a prefix query. (ryan)
18. SOLR-307: Added NGramFilterFactory and EdgeNGramFilterFactory.
(Thomas Peuss via Otis Gospodnetic)
Changes in runtime behavior
Optimizations

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@ -0,0 +1,55 @@
package org.apache.solr.analysis;
/**
* 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 java.util.Map;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.ngram.EdgeNGramTokenFilter;
/**
* Creates new instances of {@link EdgeNGramTokenFilter}.
*/
public class EdgeNGramFilterFactory extends BaseTokenFilterFactory {
private int maxGramSize = 0;
private int minGramSize = 0;
private String side;
@Override
public void init(Map<String, String> args) {
super.init(args);
String maxArg = args.get("maxGramSize");
maxGramSize = (maxArg != null ? Integer.parseInt(maxArg)
: EdgeNGramTokenFilter.DEFAULT_MAX_GRAM_SIZE);
String minArg = args.get("minGramSize");
minGramSize = (minArg != null ? Integer.parseInt(minArg)
: EdgeNGramTokenFilter.DEFAULT_MIN_GRAM_SIZE);
side = args.get("side");
if (side == null) {
side = EdgeNGramTokenFilter.Side.FRONT.getLabel();
}
}
public TokenStream create(TokenStream input) {
return new EdgeNGramTokenFilter(input, side, minGramSize, maxGramSize);
}
}

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@ -0,0 +1,49 @@
package org.apache.solr.analysis;
/**
* 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 java.util.Map;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.ngram.NGramTokenFilter;
/**
* Creates new instances of {@link NGramTokenFilter}.
*/
public class NGramFilterFactory extends BaseTokenFilterFactory {
private int maxGramSize = 0;
private int minGramSize = 0;
/** Initializes the n-gram min and max sizes and the side from which one should start tokenizing. */
@Override
public void init(Map<String, String> args) {
super.init(args);
String maxArg = args.get("maxGramSize");
maxGramSize = (maxArg != null ? Integer.parseInt(maxArg)
: NGramTokenFilter.DEFAULT_MAX_NGRAM_SIZE);
String minArg = args.get("minGramSize");
minGramSize = (minArg != null ? Integer.parseInt(minArg)
: NGramTokenFilter.DEFAULT_MIN_NGRAM_SIZE);
}
public TokenStream create(TokenStream input) {
return new NGramTokenFilter(input, minGramSize, maxGramSize);
}
}