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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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package org.apache.lucene.benchmark.quality.utils;
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import java.io.IOException;
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import org.apache.lucene.document.FieldSelector;
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import org.apache.lucene.document.FieldSelectorResult;
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import org.apache.lucene.search.IndexSearcher;
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* Utility: extract doc names from an index
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public class DocNameExtractor {
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private FieldSelector fldSel;
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private String docNameField;
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* Constructor for DocNameExtractor.
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* @param docNameField name of the stored field containing the doc name.
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public DocNameExtractor (final String docNameField) {
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this.docNameField = docNameField;
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fldSel = new FieldSelector() {
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public FieldSelectorResult accept(String fieldName) {
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return fieldName.equals(docNameField) ?
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FieldSelectorResult.LOAD_AND_BREAK :
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FieldSelectorResult.NO_LOAD;
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* Extract the name of the input doc from the index.
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* @param searcher access to the index.
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* @param docid ID of doc whose name is needed.
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* @return the name of the input doc as extracted from the index.
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* @throws IOException if cannot extract the doc name from the index.
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public String docName(IndexSearcher searcher, int docid) throws IOException {
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return searcher.doc(docid,fldSel).get(docNameField);