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Default Hedera File Service Implementation

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/*
 * Copyright (C) 2023-2024 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.file.impl;

import com.hedera.hapi.node.base.Timestamp;
import com.hedera.hapi.node.state.file.File;
import com.hedera.node.app.service.file.FileMetadata;
import edu.umd.cs.findbugs.annotations.NonNull;
import java.util.Objects;

/**
 * Base class for {@link ReadableFileStoreImpl} and {@link WritableFileStore}.
 */
public abstract class FileStore {

    protected FileStore() {
        // We have only static methods here. There is no need to initialize the class
    }

    /**
     * Convert a {@link File} to a {@link FileMetadata}.
     *
     * @param file The {@link File} to convert
     * @return The {@link FileMetadata} representation of the {@link File}
     */
    protected static @NonNull FileMetadata fileMetaFrom(@NonNull final File file) {
        Objects.requireNonNull(file);
        return new FileMetadata(
                file.fileId(),
                Timestamp.newBuilder().seconds(file.expirationSecond()).build(),
                file.keys(),
                file.contents(),
                file.memo(),
                file.deleted(),
                Timestamp.newBuilder()
                        .seconds(file.preSystemDeleteExpirationSecond())
                        .build());
    }
}