/*
* 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.fetch.source;
import com.google.common.collect.ImmutableMap;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.io.stream.BytesStreamOutput;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.search.SearchParseElement;
import org.elasticsearch.search.fetch.FetchSubPhase;
import org.elasticsearch.search.internal.InternalSearchHit;
import org.elasticsearch.search.internal.SearchContext;
import org.elasticsearch.search.lookup.SourceLookup;
import java.io.IOException;
import java.util.Map;
/**
*/
public class FetchSourceSubPhase implements FetchSubPhase {
@Inject
public FetchSourceSubPhase() {
}
@Override
public Map<String, ? extends SearchParseElement> parseElements() {
ImmutableMap.Builder<String, SearchParseElement> parseElements = ImmutableMap.builder();
parseElements.put("_source", new FetchSourceParseElement());
return parseElements.build();
}
@Override
public boolean hitsExecutionNeeded(SearchContext context) {
return false;
}
@Override
public void hitsExecute(SearchContext context, InternalSearchHit[] hits) throws ElasticsearchException {
}
@Override
public boolean hitExecutionNeeded(SearchContext context) {
return context.sourceRequested();
}
@Override
public void hitExecute(SearchContext context, HitContext hitContext) throws ElasticsearchException {
FetchSourceContext fetchSourceContext = context.fetchSourceContext();
assert fetchSourceContext.fetchSource();
if (fetchSourceContext.includes().length == 0 && fetchSourceContext.excludes().length == 0) {
hitContext.hit().sourceRef(context.lookup().source().internalSourceRef());
return;
}
SourceLookup source = context.lookup().source();
Object value = source.filter(fetchSourceContext.includes(), fetchSourceContext.excludes());
try {
final int initialCapacity = Math.min(1024, source.internalSourceRef().length());
BytesStreamOutput streamOutput = new BytesStreamOutput(initialCapacity);
XContentBuilder builder = new XContentBuilder(context.lookup().source().sourceContentType().xContent(), streamOutput);
builder.value(value);
hitContext.hit().sourceRef(builder.bytes());
} catch (IOException e) {
throw new ElasticsearchException("Error filtering source", e);
}
}
}