org.elasticsearch.index.search.shape.ShapeFetchService Maven / Gradle / Ivy
/*
* 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.search.shape;
import org.elasticsearch.ElasticsearchIllegalArgumentException;
import org.elasticsearch.ElasticsearchIllegalStateException;
import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.client.Client;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.geo.builders.ShapeBuilder;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentHelper;
import org.elasticsearch.common.xcontent.XContentParser;
import java.io.IOException;
/**
* Service which retrieves pre-indexed Shapes from another index
*/
public class ShapeFetchService extends AbstractComponent {
private final Client client;
@Inject
public ShapeFetchService(Client client, Settings settings) {
super(settings);
this.client = client;
}
/**
* Fetches the Shape with the given ID in the given type and index.
*
* @param id ID of the Shape to fetch
* @param type Index type where the Shape is indexed
* @param index Index where the Shape is indexed
* @param path Name or path of the field in the Shape Document where the Shape itself is located
* @return Shape with the given ID
* @throws IOException Can be thrown while parsing the Shape Document and extracting the Shape
*/
public ShapeBuilder fetch(String id, String type, String index, String path) throws IOException {
GetResponse response = client.get(new GetRequest(index, type, id).preference("_local").operationThreaded(false)).actionGet();
if (!response.isExists()) {
throw new ElasticsearchIllegalArgumentException("Shape with ID [" + id + "] in type [" + type + "] not found");
}
String[] pathElements = Strings.splitStringToArray(path, '.');
int currentPathSlot = 0;
XContentParser parser = null;
try {
parser = XContentHelper.createParser(response.getSourceAsBytesRef());
XContentParser.Token currentToken;
while ((currentToken = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (currentToken == XContentParser.Token.FIELD_NAME) {
if (pathElements[currentPathSlot].equals(parser.currentName())) {
parser.nextToken();
if (++currentPathSlot == pathElements.length) {
return ShapeBuilder.parse(parser);
}
} else {
parser.nextToken();
parser.skipChildren();
}
}
}
throw new ElasticsearchIllegalStateException("Shape with name [" + id + "] found but missing " + path + " field");
} finally {
if (parser != null) {
parser.close();
}
}
}
}