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Hedera™ Hashgraph SDK for Java
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/*-
 *
 * Hedera Java SDK
 *
 * Copyright (C) 2020 - 2022 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.google.protobuf.InvalidProtocolBufferException;
import com.hedera.hashgraph.sdk.proto.FileServiceGrpc;
import com.hedera.hashgraph.sdk.proto.SchedulableTransactionBody;
import com.hedera.hashgraph.sdk.proto.SmartContractServiceGrpc;
import com.hedera.hashgraph.sdk.proto.SystemUndeleteTransactionBody;
import com.hedera.hashgraph.sdk.proto.TransactionBody;
import com.hedera.hashgraph.sdk.proto.TransactionResponse;
import io.grpc.MethodDescriptor;
import java8.util.concurrent.CompletableFuture;

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

/**
 * Undelete a file or smart contract that was deleted by AdminDelete.
 * 
 * Can only be done with a Hedera admin.
 */
public final class SystemUndeleteTransaction extends Transaction {
    @Nullable
    private FileId fileId;
    @Nullable
    private ContractId contractId;

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

    /**
     * Constructor.
     *
     * @param txs Compound list of transaction id's list of (AccountId, Transaction)
     *            records
     * @throws InvalidProtocolBufferException       when there is an issue with the protobuf
     */
    SystemUndeleteTransaction(LinkedHashMap> txs) throws InvalidProtocolBufferException {
        super(txs);
        initFromTransactionBody();
    }

    /**
     * Constructor.
     *
     * @param txBody protobuf TransactionBody
     */
    SystemUndeleteTransaction(com.hedera.hashgraph.sdk.proto.TransactionBody txBody) {
        super(txBody);
        initFromTransactionBody();
    }

    /**
     * Extract the file id.
     *
     * @return                          the file id
     */
    @Nullable
    public final FileId getFileId() {
        return fileId;
    }

    /**
     * Sets the file ID to undelete.
     * 

     * Mutually exclusive with {@link #setContractId(ContractId)}.
     *
     * @param fileId The FileId to be set
     * @return {@code this}
     */
    public final SystemUndeleteTransaction setFileId(FileId fileId) {
        Objects.requireNonNull(fileId);
        requireNotFrozen();
        this.fileId = fileId;
        return this;
    }

    /**
     * The contract ID instance to undelete, in the format used in transactions
     *
     * @return the contractId
     */
    @Nullable
    public ContractId getContractId() {
        return contractId;
    }

    /**
     * Sets the contract ID to undelete.
     * 
     * Mutually exclusive with {@link #setFileId(FileId)}.
     *
     * @param contractId The ContractId to be set
     * @return {@code this}
     */
    public final SystemUndeleteTransaction setContractId(ContractId contractId) {
        Objects.requireNonNull(contractId);
        requireNotFrozen();
        this.contractId = contractId;
        return this;
    }

    /**
     * Initialize from the transaction body.
     */
    void initFromTransactionBody() {
        var body = sourceTransactionBody.getSystemUndelete();
        if (body.hasFileID()) {
            fileId = FileId.fromProtobuf(body.getFileID());
        }
        if (body.hasContractID()) {
            contractId = ContractId.fromProtobuf(body.getContractID());
        }
    }

    /**
     * Build the transaction body.
     *
     * @return {@link com.hedera.hashgraph.sdk.proto.SystemUndeleteTransactionBody}
     */
    SystemUndeleteTransactionBody.Builder build() {
        var builder = SystemUndeleteTransactionBody.newBuilder();
        if (fileId != null) {
            builder.setFileID(fileId.toProtobuf());
        }
        if (contractId != null) {
            builder.setContractID(contractId.toProtobuf());
        }

        return builder;
    }

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

        if (contractId != null) {
            contractId.validateChecksum(client);
        }
    }

    @Override
    CompletableFuture onExecuteAsync(Client client) {
        int modesEnabled = (fileId != null ? 1 : 0) + (contractId != null ? 1 : 0);
        if (modesEnabled != 1) {
            throw new IllegalStateException("SystemDeleteTransaction must have exactly 1 of the following fields set: contractId, fileId");
        }
        return super.onExecuteAsync(client);
    }


    @Override
    MethodDescriptor getMethodDescriptor() {
        if (fileId != null) {
            return FileServiceGrpc.getSystemUndeleteMethod();
        } else {
            return SmartContractServiceGrpc.getSystemUndeleteMethod();
        }
    }

    @Override
    void onFreeze(TransactionBody.Builder bodyBuilder) {
        bodyBuilder.setSystemUndelete(build());
    }

    @Override
    void onScheduled(SchedulableTransactionBody.Builder scheduled) {
        scheduled.setSystemUndelete(build());
    }
}