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// Copyright (C) 2018 The Android Open Source Project, 2009-2015 Elasticsearch
//
// Licensed 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 com.google.gerrit.elasticsearch.builders;
import com.google.gerrit.elasticsearch.ElasticQueryAdapter;
import java.io.IOException;
import java.util.List;
/**
* A search source builder allowing to easily build search source.
*
* <p>A trimmed down and modified version of org.elasticsearch.search.builder.SearchSourceBuilder.
*/
public class SearchSourceBuilder {
private final ElasticQueryAdapter adapter;
private QuerySourceBuilder querySourceBuilder;
private int from = -1;
private int size = -1;
private List<String> fieldNames;
/** Constructs a new search source builder. */
public SearchSourceBuilder(ElasticQueryAdapter adapter) {
this.adapter = adapter;
}
/** Constructs a new search source builder with a search query. */
public SearchSourceBuilder query(QueryBuilder query) {
if (this.querySourceBuilder == null) {
this.querySourceBuilder = new QuerySourceBuilder(query);
}
return this;
}
/** From index to start the search from. Defaults to <tt>0</tt>. */
public SearchSourceBuilder from(int from) {
this.from = from;
return this;
}
/** The number of search hits to return. Defaults to <tt>10</tt>. */
public SearchSourceBuilder size(int size) {
this.size = size;
return this;
}
/**
* Sets the fields to load and return as part of the search request. If none are specified, the
* source of the document will be returned.
*/
public SearchSourceBuilder fields(List<String> fields) {
this.fieldNames = fields;
return this;
}
@Override
public final String toString() {
try {
XContentBuilder builder = new XContentBuilder();
toXContent(builder);
return builder.string();
} catch (IOException ioe) {
return "";
}
}
private void toXContent(XContentBuilder builder) throws IOException {
builder.startObject();
innerToXContent(builder);
builder.endObject();
}
private void innerToXContent(XContentBuilder builder) throws IOException {
if (from != -1) {
builder.field("from", from);
}
if (size != -1) {
builder.field("size", size);
}
if (querySourceBuilder != null) {
querySourceBuilder.innerToXContent(builder);
}
if (fieldNames != null) {
if (fieldNames.size() == 1) {
builder.field(adapter.searchFilteringName(), fieldNames.get(0));
} else {
builder.startArray(adapter.searchFilteringName());
for (String fieldName : fieldNames) {
builder.value(fieldName);
}
builder.endArray();
}
}
}
}
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