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package com.netease.cloud.services.nos.model;


import org.slf4j.Logger;

import java.io.File;
import java.io.InputStream;

import static com.netease.cloud.util.IOUtils.release;

/**
 * Used to represent an NOS data source that either has a file or an input
 * stream.
 */
public interface NosDataSource {
    public File getFile();
    public void setFile(File file);
    public InputStream getInputStream();
    public void setInputStream(InputStream inputStream);

    /**
     * {@link NosDataSource} specific utilities.
     */
    public static enum Utils {
        ;
        /**
         * Clean up any temporary streams created during the execution,
         * and restore the original file and/or input stream.
         */
        public static void cleanupDataSource(NosDataSource req,
                                             final File fileOrig, final InputStream inputStreamOrig,
                                             InputStream inputStreamCurr, Logger log) {
            if (fileOrig != null) {
                // We opened a file underneath so would need to release it
                release(inputStreamCurr, log);
            }
            // restore the original input stream so the caller could close
            // it if necessary
            req.setInputStream(inputStreamOrig);
            req.setFile(fileOrig);
        }
    }
}