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Default Hedera Token Service Implementation

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/*
 * Copyright (C) 2022-2024 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.node.app.service.token.impl.handlers;

import static com.hedera.hapi.node.base.ResponseCodeEnum.NOT_SUPPORTED;
import static java.util.Objects.requireNonNull;

import com.hedera.hapi.node.base.HederaFunctionality;
import com.hedera.hapi.node.base.QueryHeader;
import com.hedera.hapi.node.base.ResponseHeader;
import com.hedera.hapi.node.token.CryptoGetLiveHashResponse;
import com.hedera.hapi.node.transaction.Query;
import com.hedera.hapi.node.transaction.Response;
import com.hedera.node.app.spi.workflows.FreeQueryHandler;
import com.hedera.node.app.spi.workflows.PreCheckException;
import com.hedera.node.app.spi.workflows.QueryContext;
import edu.umd.cs.findbugs.annotations.NonNull;
import javax.inject.Inject;
import javax.inject.Singleton;

/**
 * This class contains all workflow-related functionality regarding {@link
 * HederaFunctionality#CRYPTO_GET_LIVE_HASH}.
 *
 * This transaction type is not currently supported. It is reserved for future use.
 */
@Singleton
public class CryptoGetLiveHashHandler extends FreeQueryHandler {
    /**
     * Default constructor for injection.
     */
    @Inject
    public CryptoGetLiveHashHandler() {
        // Exists for injection
    }

    @Override
    public QueryHeader extractHeader(@NonNull final Query query) {
        requireNonNull(query);
        return query.cryptoGetLiveHashOrThrow().header();
    }

    @Override
    public Response createEmptyResponse(@NonNull final ResponseHeader header) {
        requireNonNull(header);
        final var response = CryptoGetLiveHashResponse.newBuilder().header(requireNonNull(header));
        return Response.newBuilder().cryptoGetLiveHash(response).build();
    }

    @Override
    public void validate(@NonNull final QueryContext context) throws PreCheckException {
        requireNonNull(context);
        throw new PreCheckException(NOT_SUPPORTED);
    }

    @Override
    public Response findResponse(@NonNull final QueryContext context, @NonNull final ResponseHeader header) {
        requireNonNull(context);
        requireNonNull(header);
        throw new UnsupportedOperationException(NOT_SUPPORTED.toString());
    }
}