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Hedera™ Hashgraph SDK for Java
There is a newer version: 2.44.0
/*-
 *
 * Hedera Java SDK
 *
 * Copyright (C) 2020 - 2024 Hedera Hashgraph, LLC
 *
 * Licensed 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 com.hedera.hashgraph.sdk;

import com.hedera.hashgraph.sdk.proto.ConsensusGetTopicInfoQuery;
import com.hedera.hashgraph.sdk.proto.ConsensusServiceGrpc;
import com.hedera.hashgraph.sdk.proto.QueryHeader;
import com.hedera.hashgraph.sdk.proto.Response;
import com.hedera.hashgraph.sdk.proto.ResponseHeader;
import io.grpc.MethodDescriptor;

import javax.annotation.Nullable;
import java.util.Objects;

/**
 * Retrieve the latest state of a topic.
 * 
 * This method is unrestricted and allowed on any topic by any payer account.
 */
public final class TopicInfoQuery extends Query {
    @Nullable
    TopicId topicId = null;

    /**
     * Constructor.
     */
    public TopicInfoQuery() {
    }

    /**
     * Extract the topic id.
     *
     * @return                          the topic id
     */
    @Nullable
    public TopicId getTopicId() {
        return topicId;
    }

    /**
     * Set the topic to retrieve info about (the parameters and running state of).
     *
     * @param topicId The TopicId to be set
     * @return {@code this}
     */
    public TopicInfoQuery setTopicId(TopicId topicId) {
        Objects.requireNonNull(topicId);
        this.topicId = topicId;
        return this;
    }

    @Override
    void validateChecksums(Client client) throws BadEntityIdException {
        if (topicId != null) {
            topicId.validateChecksum(client);
        }
    }

    @Override
    void onMakeRequest(com.hedera.hashgraph.sdk.proto.Query.Builder queryBuilder, QueryHeader header) {
        var builder = ConsensusGetTopicInfoQuery.newBuilder();
        if (topicId != null) {
            builder.setTopicID(topicId.toProtobuf());
        }

        queryBuilder.setConsensusGetTopicInfo(builder.setHeader(header));
    }

    @Override
    ResponseHeader mapResponseHeader(Response response) {
        return response.getConsensusGetTopicInfo().getHeader();
    }

    @Override
    QueryHeader mapRequestHeader(com.hedera.hashgraph.sdk.proto.Query request) {
        return request.getConsensusGetTopicInfo().getHeader();
    }

    @Override
    TopicInfo mapResponse(Response response, AccountId nodeId, com.hedera.hashgraph.sdk.proto.Query request) {
        return TopicInfo.fromProtobuf(response.getConsensusGetTopicInfo());
    }

    @Override
    MethodDescriptor getMethodDescriptor() {
        return ConsensusServiceGrpc.getGetTopicInfoMethod();
    }
}