/*
* 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 com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import org.apache.lucene.index.LeafReader;
import org.apache.lucene.index.LeafReaderContext;
import org.elasticsearch.ElasticsearchIllegalArgumentException;
import org.elasticsearch.ElasticsearchParseException;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.index.fieldvisitor.SingleFieldsVisitor;
import org.elasticsearch.index.mapper.FieldMapper;
import org.elasticsearch.index.mapper.MapperService;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import java.util.Map;
import java.util.Set;
/**
*
*/
public class FieldsLookup implements Map {
private final MapperService mapperService;
@Nullable
private final String[] types;
private LeafReader reader;
private int docId = -1;
private final Map<String, FieldLookup> cachedFieldData = Maps.newHashMap();
private final SingleFieldsVisitor fieldVisitor;
FieldsLookup(MapperService mapperService, @Nullable String[] types) {
this.mapperService = mapperService;
this.types = types;
this.fieldVisitor = new SingleFieldsVisitor(null);
}
public void setNextReader(LeafReaderContext context) {
if (this.reader == context.reader()) { // if we are called with the same reader, don't invalidate source
return;
}
this.reader = context.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, types);
if (mapper == null) {
throw new ElasticsearchIllegalArgumentException("No field found for [" + name + "] in mapping with types " + Arrays.toString(types) + "");
}
data = new FieldLookup(mapper);
cachedFieldData.put(name, data);
}
if (data.fields() == null) {
String fieldName = data.mapper().names().indexName();
fieldVisitor.reset(fieldName);
try {
reader.document(docId, fieldVisitor);
fieldVisitor.postProcess(data.mapper());
data.fields(ImmutableMap.of(name, fieldVisitor.fields().get(data.mapper().names().indexName())));
} 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();
}
}
}