RestGetMappingAction.java example

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 * the Apache License, Version 2.0 (the "License"); you may
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 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
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package org.elasticsearch.rest.action.admin.indices;

import com.carrotsearch.hppc.cursors.ObjectObjectCursor;

import org.elasticsearch.action.admin.indices.mapping.get.GetMappingsRequest;
import org.elasticsearch.action.admin.indices.mapping.get.GetMappingsResponse;
import org.elasticsearch.action.support.IndicesOptions;
import org.elasticsearch.client.node.NodeClient;
import org.elasticsearch.cluster.metadata.MappingMetaData;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.collect.ImmutableOpenMap;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.index.IndexNotFoundException;
import org.elasticsearch.indices.TypeMissingException;
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.RestBuilderListener;

import java.io.IOException;

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

public class RestGetMappingAction extends BaseRestHandler {
    public RestGetMappingAction(Settings settings, RestController controller) {
        super(settings);
        controller.registerHandler(GET, "/{index}/{type}/_mapping", this);
        controller.registerHandler(GET, "/{index}/_mappings/{type}", this);
        controller.registerHandler(GET, "/{index}/_mapping/{type}", this);
        controller.registerHandler(GET, "/_mapping/{type}", this);
    }

    @Override
    public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
        final String[] indices = Strings.splitStringByCommaToArray(request.param("index"));
        final String[] types = request.paramAsStringArrayOrEmptyIfAll("type");
        GetMappingsRequest getMappingsRequest = new GetMappingsRequest();
        getMappingsRequest.indices(indices).types(types);
        getMappingsRequest.indicesOptions(IndicesOptions.fromRequest(request, getMappingsRequest.indicesOptions()));
        getMappingsRequest.local(request.paramAsBoolean("local", getMappingsRequest.local()));
        return channel -> client.admin().indices().getMappings(getMappingsRequest, new RestBuilderListener<GetMappingsResponse>(channel) {
            @Override
            public RestResponse buildResponse(GetMappingsResponse response, XContentBuilder builder) throws Exception {

                ImmutableOpenMap<String, ImmutableOpenMap<String, MappingMetaData>> mappingsByIndex = response.getMappings();
                if (mappingsByIndex.isEmpty()) {
                    if (indices.length != 0 && types.length != 0) {
                        return new BytesRestResponse(OK, builder.startObject().endObject());
                    } else if (indices.length != 0) {
                        builder.close();
                        return new BytesRestResponse(channel, new IndexNotFoundException(indices[0]));
                    } else if (types.length != 0) {
                        builder.close();
                        return new BytesRestResponse(channel, new TypeMissingException("_all", types[0]));
                    } else {
                        return new BytesRestResponse(OK, builder.startObject().endObject());
                    }
                }

                builder.startObject();
                for (ObjectObjectCursor<String, ImmutableOpenMap<String, MappingMetaData>> indexEntry : mappingsByIndex) {
                    if (indexEntry.value.isEmpty()) {
                        continue;
                    }
                    builder.startObject(indexEntry.key);
                    builder.startObject(Fields.MAPPINGS);
                    for (ObjectObjectCursor<String, MappingMetaData> typeEntry : indexEntry.value) {
                        builder.field(typeEntry.key);
                        builder.map(typeEntry.value.sourceAsMap());
                    }
                    builder.endObject();
                    builder.endObject();
                }

                builder.endObject();
                return new BytesRestResponse(OK, builder);
            }
        });
    }

    static class Fields {
        static final String MAPPINGS = "mappings";
    }
}