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package org.apache.lucene.document;
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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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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.List;
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* A {@link FieldSelector} based on a Map of field names to {@link FieldSelectorResult}s
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public class MapFieldSelector implements FieldSelector {
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Map<String,FieldSelectorResult> fieldSelections;
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/** Create a a MapFieldSelector
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* @param fieldSelections maps from field names (String) to {@link FieldSelectorResult}s
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public MapFieldSelector(Map<String,FieldSelectorResult> fieldSelections) {
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this.fieldSelections = fieldSelections;
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/** Create a a MapFieldSelector
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* @param fields fields to LOAD. List of Strings. All other fields are NO_LOAD.
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public MapFieldSelector(List<String> fields) {
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fieldSelections = new HashMap<String,FieldSelectorResult>(fields.size()*5/3);
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for (final String field : fields)
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fieldSelections.put(field, FieldSelectorResult.LOAD);
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/** Create a a MapFieldSelector
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* @param fields fields to LOAD. All other fields are NO_LOAD.
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public MapFieldSelector(String... fields) {
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this(Arrays.asList(fields));
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/** Load field according to its associated value in fieldSelections
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* @param field a field name
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* @return the fieldSelections value that field maps to or NO_LOAD if none.
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public FieldSelectorResult accept(String field) {
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FieldSelectorResult selection = fieldSelections.get(field);
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return selection!=null ? selection : FieldSelectorResult.NO_LOAD;