org.elasticsearch.index.search.shape.ShapeFetchService Maven / Gradle / Ivy
/*
* Licensed to ElasticSearch and Shay Banon 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 com.spatial4j.core.shape.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.component.AbstractComponent;
import org.elasticsearch.common.geo.GeoJSONShapeParser;
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 shapeField Name 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 Shape fetch(String id, String type, String index, String shapeField) 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");
}
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 (shapeField.equals(parser.currentName())) {
parser.nextToken();
return GeoJSONShapeParser.parse(parser);
} else {
parser.skipChildren();
}
}
}
throw new ElasticSearchIllegalStateException("Shape with name [" + id + "] found but missing " + shapeField + " field");
} finally {
if (parser != null) {
parser.close();
}
}
}
}