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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.admin.indices.alias.get;
import com.carrotsearch.hppc.cursors.ObjectObjectCursor;
import org.elasticsearch.action.admin.indices.alias.get.GetAliasesRequest;
import org.elasticsearch.action.admin.indices.alias.get.GetAliasesResponse;
import org.elasticsearch.action.support.IndicesOptions;
import org.elasticsearch.client.Client;
import org.elasticsearch.cluster.metadata.AliasMetaData;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.ToXContent;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentBuilderString;
import org.elasticsearch.rest.*;
import org.elasticsearch.rest.action.support.RestBuilderListener;
import java.util.List;
import java.util.Locale;
import static org.elasticsearch.rest.RestRequest.Method.GET;
import static org.elasticsearch.rest.RestStatus.OK;
/**
*/
public class RestGetAliasesAction extends BaseRestHandler {
@Inject
public RestGetAliasesAction(Settings settings, RestController controller, Client client) {
super(settings, controller, client);
controller.registerHandler(GET, "/_alias/{name}", this);
controller.registerHandler(GET, "/{index}/_alias/{name}", this);
}
@Override
public void handleRequest(final RestRequest request, final RestChannel channel, final Client client) {
final String[] aliases = request.paramAsStringArrayOrEmptyIfAll("name");
final String[] indices = Strings.splitStringByCommaToArray(request.param("index"));
final GetAliasesRequest getAliasesRequest = new GetAliasesRequest(aliases);
getAliasesRequest.indices(indices);
getAliasesRequest.indicesOptions(IndicesOptions.fromRequest(request, getAliasesRequest.indicesOptions()));
getAliasesRequest.local(request.paramAsBoolean("local", getAliasesRequest.local()));
client.admin().indices().getAliases(getAliasesRequest, new RestBuilderListener<GetAliasesResponse>(channel) {
@Override
public RestResponse buildResponse(GetAliasesResponse response, XContentBuilder builder) throws Exception {
// empty body, if indices were specified but no aliases were
if (indices.length > 0 && response.getAliases().isEmpty()) {
return new BytesRestResponse(OK, builder.startObject().endObject());
} else if (response.getAliases().isEmpty()) {
String message = String.format(Locale.ROOT, "alias [%s] missing", toNamesString(getAliasesRequest.aliases()));
builder.startObject()
.field("error", message)
.field("status", RestStatus.NOT_FOUND.getStatus())
.endObject();
return new BytesRestResponse(RestStatus.NOT_FOUND, builder);
}
builder.startObject();
for (ObjectObjectCursor<String, List<AliasMetaData>> entry : response.getAliases()) {
builder.startObject(entry.key, XContentBuilder.FieldCaseConversion.NONE);
builder.startObject(Fields.ALIASES);
for (AliasMetaData alias : entry.value) {
AliasMetaData.Builder.toXContent(alias, builder, ToXContent.EMPTY_PARAMS);
}
builder.endObject();
builder.endObject();
}
builder.endObject();
return new BytesRestResponse(OK, builder);
}
});
}
private static String toNamesString(String... names) {
if (names == null || names.length == 0) {
return "";
} else if (names.length == 1) {
return names[0];
} else {
StringBuilder builder = new StringBuilder(names[0]);
for (int i = 1; i < names.length; i++) {
builder.append(',').append(names[i]);
}
return builder.toString();
}
}
static class Fields {
static final XContentBuilderString ALIASES = new XContentBuilderString("aliases");
}
}