/*
* 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.search.spell;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.suggest.InputIterator;
import org.apache.lucene.index.Terms;
import org.apache.lucene.index.MultiFields;
import java.io.*;
/**
* Lucene Dictionary: terms taken from the given field
* of a Lucene index.
*/
public class LuceneDictionary implements Dictionary {
private IndexReader reader;
private String field;
/**
* Creates a new Dictionary, pulling source terms from
* the specified <code>field</code> in the provided <code>reader</code>
*/
public LuceneDictionary(IndexReader reader, String field) {
this.reader = reader;
this.field = field;
}
@Override
public final InputIterator getEntryIterator() throws IOException {
final Terms terms = MultiFields.getTerms(reader, field);
if (terms != null) {
return new InputIterator.InputIteratorWrapper(terms.iterator());
} else {
return InputIterator.EMPTY;
}
}
}