org.elasticsearch.rest.action.document.RestGetAction Maven / Gradle / Ivy

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 * 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
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 * Unless required by applicable law or agreed to in writing,
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 * specific language governing permissions and limitations
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package org.elasticsearch.rest.action.document;

import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.client.node.NodeClient;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.index.VersionType;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.BytesRestResponse;
import org.elasticsearch.rest.RestController;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.RestResponse;
import org.elasticsearch.rest.action.RestActions;
import org.elasticsearch.rest.action.RestBuilderListener;
import org.elasticsearch.search.fetch.subphase.FetchSourceContext;

import java.io.IOException;

import static org.elasticsearch.rest.RestRequest.Method.GET;
import static org.elasticsearch.rest.RestStatus.NOT_FOUND;
import static org.elasticsearch.rest.RestStatus.OK;

public class RestGetAction extends BaseRestHandler {

    @Inject
    public RestGetAction(Settings settings, RestController controller) {
        super(settings);
        controller.registerHandler(GET, "/{index}/{type}/{id}", this);
    }

    @Override
    public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
        final GetRequest getRequest = new GetRequest(request.param("index"), request.param("type"), request.param("id"));
        getRequest.operationThreaded(true);
        getRequest.refresh(request.paramAsBoolean("refresh", getRequest.refresh()));
        getRequest.routing(request.param("routing"));  // order is important, set it after routing, so it will set the routing
        getRequest.parent(request.param("parent"));
        getRequest.preference(request.param("preference"));
        getRequest.realtime(request.paramAsBoolean("realtime", getRequest.realtime()));
        if (request.param("fields") != null) {
            throw new IllegalArgumentException("The parameter [fields] is no longer supported, " +
                "please use [stored_fields] to retrieve stored fields or or [_source] to load the field from _source");
        }
        String sField = request.param("stored_fields");
        if (sField != null) {
            String[] sFields = Strings.splitStringByCommaToArray(sField);
            if (sFields != null) {
                getRequest.storedFields(sFields);
            }
        }

        getRequest.version(RestActions.parseVersion(request));
        getRequest.versionType(VersionType.fromString(request.param("version_type"), getRequest.versionType()));

        getRequest.fetchSourceContext(FetchSourceContext.parseFromRestRequest(request));

        return channel -> client.get(getRequest, new RestBuilderListener(channel) {
            @Override
            public RestResponse buildResponse(GetResponse response, XContentBuilder builder) throws Exception {
                builder.startObject();
                response.toXContent(builder, request);
                builder.endObject();
                if (!response.isExists()) {
                    return new BytesRestResponse(NOT_FOUND, builder);
                } else {
                    return new BytesRestResponse(OK, builder);
                }
            }
        });
    }
}