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