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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.index.query;
import org.apache.lucene.index.IndexReader;
import org.elasticsearch.client.Client;
import org.elasticsearch.common.xcontent.NamedXContentRegistry;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.IndexSettings;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.script.Script;
import org.elasticsearch.script.ScriptService;
import org.elasticsearch.script.TemplateScript;
import java.util.function.LongSupplier;
/**
* Context object used to rewrite {@link QueryBuilder} instances into simplified version.
*/
public class QueryRewriteContext {
protected final MapperService mapperService;
protected final ScriptService scriptService;
protected final IndexSettings indexSettings;
private final NamedXContentRegistry xContentRegistry;
protected final Client client;
protected final IndexReader reader;
protected final LongSupplier nowInMillis;
public QueryRewriteContext(IndexSettings indexSettings, MapperService mapperService, ScriptService scriptService,
NamedXContentRegistry xContentRegistry, Client client, IndexReader reader,
LongSupplier nowInMillis) {
this.mapperService = mapperService;
this.scriptService = scriptService;
this.indexSettings = indexSettings;
this.xContentRegistry = xContentRegistry;
this.client = client;
this.reader = reader;
this.nowInMillis = nowInMillis;
}
/**
* Returns a clients to fetch resources from local or remove nodes.
*/
public Client getClient() {
return client;
}
/**
* Returns the index settings for this context. This might return null if the
* context has not index scope.
*/
public IndexSettings getIndexSettings() {
return indexSettings;
}
/**
* Return the MapperService.
*/
public MapperService getMapperService() {
return mapperService;
}
/** Return the script service to allow compiling scripts within queries. */
public ScriptService getScriptService() {
return scriptService;
}
/** Return the current {@link IndexReader}, or {@code null} if no index reader is available, for
* instance if we are on the coordinating node or if this rewrite context is used to index
* queries (percolation). */
public IndexReader getIndexReader() {
return reader;
}
/**
* The registry used to build new {@link XContentParser}s. Contains registered named parsers needed to parse the query.
*/
public NamedXContentRegistry getXContentRegistry() {
return xContentRegistry;
}
public long nowInMillis() {
return nowInMillis.getAsLong();
}
public String getTemplateBytes(Script template) {
TemplateScript compiledTemplate = scriptService.compile(template, TemplateScript.CONTEXT).newInstance(template.getParams());
return compiledTemplate.execute();
}
}
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