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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.rest.action;
import org.elasticsearch.action.fieldcaps.FieldCapabilitiesRequest;
import org.elasticsearch.action.fieldcaps.FieldCapabilitiesResponse;
import org.elasticsearch.action.support.IndicesOptions;
import org.elasticsearch.client.node.NodeClient;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentParser;
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.RestStatus;
import java.io.IOException;
import static org.elasticsearch.rest.RestRequest.Method.GET;
import static org.elasticsearch.rest.RestRequest.Method.POST;
import static org.elasticsearch.rest.RestStatus.NOT_FOUND;
import static org.elasticsearch.rest.RestStatus.OK;
public class RestFieldCapabilitiesAction extends BaseRestHandler {
public RestFieldCapabilitiesAction(Settings settings, RestController controller) {
super(settings);
controller.registerHandler(GET, "/_field_caps", this);
controller.registerHandler(POST, "/_field_caps", this);
controller.registerHandler(GET, "/{index}/_field_caps", this);
controller.registerHandler(POST, "/{index}/_field_caps", this);
}
@Override
public RestChannelConsumer prepareRequest(final RestRequest request,
final NodeClient client) throws IOException {
if (request.hasContentOrSourceParam() && request.hasParam("fields")) {
throw new IllegalArgumentException("can't specify a request body and [fields]" +
" request parameter, either specify a request body or the" +
" [fields] request parameter");
}
final String[] indices = Strings.splitStringByCommaToArray(request.param("index"));
final FieldCapabilitiesRequest fieldRequest;
if (request.hasContentOrSourceParam()) {
try (XContentParser parser = request.contentOrSourceParamParser()) {
fieldRequest = FieldCapabilitiesRequest.parseFields(parser);
}
} else {
fieldRequest = new FieldCapabilitiesRequest();
fieldRequest.fields(Strings.splitStringByCommaToArray(request.param("fields")));
}
fieldRequest.indices(indices);
fieldRequest.indicesOptions(
IndicesOptions.fromRequest(request, fieldRequest.indicesOptions())
);
return channel -> client.fieldCaps(fieldRequest,
new RestBuilderListener<FieldCapabilitiesResponse>(channel) {
@Override
public RestResponse buildResponse(FieldCapabilitiesResponse response,
XContentBuilder builder) throws Exception {
RestStatus status = OK;
builder.startObject();
response.toXContent(builder, request);
builder.endObject();
return new BytesRestResponse(status, builder);
}
});
}
}