/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.apache.lucene.index.IndexReader;
import org.elasticsearch.ElasticSearchIllegalArgumentException;
import org.elasticsearch.ElasticSearchParseException;
import org.elasticsearch.common.collect.Maps;
import org.elasticsearch.common.lucene.document.SingleFieldSelector;
import org.elasticsearch.index.mapper.FieldMapper;
import org.elasticsearch.index.mapper.MapperService;
import java.io.IOException;
import java.util.Collection;
import java.util.Map;
import java.util.Set;
/**
* @author kimchy (shay.banon)
*/
public class FieldsLookup implements Map {
private final MapperService mapperService;
private IndexReader reader;
private int docId = -1;
private final Map<String, FieldLookup> cachedFieldData = Maps.newHashMap();
private final SingleFieldSelector fieldSelector = new SingleFieldSelector();
FieldsLookup(MapperService mapperService) {
this.mapperService = mapperService;
}
public void setNextReader(IndexReader reader) {
if (this.reader == reader) { // if we are called with the same reader, don't invalidate source
return;
}
this.reader = reader;
clearCache();
this.docId = -1;
}
public void setNextDocId(int docId) {
if (this.docId == docId) { // if we are called with the same docId, don't invalidate source
return;
}
this.docId = docId;
clearCache();
}
@Override public Object get(Object key) {
return loadFieldData(key.toString());
}
@Override public boolean containsKey(Object key) {
try {
loadFieldData(key.toString());
return true;
} catch (Exception e) {
return false;
}
}
@Override public int size() {
throw new UnsupportedOperationException();
}
@Override public boolean isEmpty() {
throw new UnsupportedOperationException();
}
@Override public Set keySet() {
throw new UnsupportedOperationException();
}
@Override public Collection values() {
throw new UnsupportedOperationException();
}
@Override public Set entrySet() {
throw new UnsupportedOperationException();
}
@Override public Object put(Object key, Object value) {
throw new UnsupportedOperationException();
}
@Override public Object remove(Object key) {
throw new UnsupportedOperationException();
}
@Override public void clear() {
throw new UnsupportedOperationException();
}
@Override public void putAll(Map m) {
throw new UnsupportedOperationException();
}
@Override public boolean containsValue(Object value) {
throw new UnsupportedOperationException();
}
private FieldLookup loadFieldData(String name) {
FieldLookup data = cachedFieldData.get(name);
if (data == null) {
FieldMapper mapper = mapperService.smartNameFieldMapper(name);
if (mapper == null) {
throw new ElasticSearchIllegalArgumentException("No field found for [" + name + "]");
}
data = new FieldLookup(mapper);
cachedFieldData.put(name, data);
}
if (data.doc() == null) {
fieldSelector.name(data.mapper().names().indexName());
try {
data.doc(reader.document(docId, fieldSelector));
} catch (IOException e) {
throw new ElasticSearchParseException("failed to load field [" + name + "]", e);
}
}
return data;
}
private void clearCache() {
for (Entry<String, FieldLookup> entry : cachedFieldData.entrySet()) {
entry.getValue().clear();
}
}
}