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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.search.lookup;
import org.elasticsearch.index.mapper.FieldMapper;
import org.elasticsearch.index.mapper.MappedFieldType;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
*
*/
public class FieldLookup {
// we can cached fieldType completely per name, since its on an index/shard level (the lookup, and it does not change within the scope of a search request)
private final MappedFieldType fieldType;
private Map<String, List<Object>> fields;
private Object value;
private boolean valueLoaded = false;
private List<Object> values = new ArrayList<>();
private boolean valuesLoaded = false;
FieldLookup(MappedFieldType fieldType) {
this.fieldType = fieldType;
}
public MappedFieldType fieldType() {
return fieldType;
}
public Map<String, List<Object>> fields() {
return fields;
}
/**
* Sets the post processed values.
*/
public void fields(Map<String, List<Object>> fields) {
this.fields = fields;
}
public void clear() {
value = null;
valueLoaded = false;
values.clear();
valuesLoaded = false;
fields = null;
}
public boolean isEmpty() {
if (valueLoaded) {
return value == null;
}
if (valuesLoaded) {
return values.isEmpty();
}
return getValue() == null;
}
public Object getValue() {
if (valueLoaded) {
return value;
}
valueLoaded = true;
value = null;
List<Object> values = fields.get(fieldType.names().indexName());
return values != null ? value = values.get(0) : null;
}
public List<Object> getValues() {
if (valuesLoaded) {
return values;
}
valuesLoaded = true;
values.clear();
return values = fields().get(fieldType.names().indexName());
}
}
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