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/**
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 *
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 */
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package in.shop2020.util;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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/**
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 * Utility functions to store and retrieve serialised objects
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 *
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 * @author naveen
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 *
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 */
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public class DBUtils {
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	/**
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	 * Serialises object into given file
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	 *
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	 * @param objectToStore Object to store
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	 * @param dbFile File to use
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	 * @throws Exception
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	 */
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	public static void store(Object objectToStore, String dbFile)
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		throws Exception {
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		File f = new File(dbFile);
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		if(!f.exists()) {
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			f.createNewFile();
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		}
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		ObjectOutputStream out = null;
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		try {
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			FileOutputStream fos = new FileOutputStream(f);
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			out = new ObjectOutputStream(fos);
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			out.writeObject(objectToStore);
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		}
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		finally {
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			if(out != null) {
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				out.close();
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			}
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		}
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		Utils.info("Serialization complete");
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	}
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	/**
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	 *
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	 * @param text
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	 * @param dbFile
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	 * @throws Exception
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	 */
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	public static void store(String text, String filename)
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		throws Exception {
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		File f = new File(filename);
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		if(!f.exists()) {
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			f.createNewFile();
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		}
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		ObjectOutputStream out = null;
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		try {
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			FileOutputStream fos = new FileOutputStream(f);
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			fos.write(text.getBytes());
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		}
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		finally {
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			if(out != null) {
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				out.close();
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			}
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		}
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		Utils.info("Text writing is complete");
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	}
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	/**
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	 * Retrieves serialised object from given file
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	 *
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	 * @param dbFile
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	 * @return De-serialised object
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	 * @throws Exception
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	 */
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	public static Object read(String dbFile) throws Exception {
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		File f = new File(dbFile);
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		if(!f.exists()) {
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			Utils.severe(dbFile + " - does not exist");
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			return null;
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		}
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		Object obj = null;
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		ObjectInputStream in = null;
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		try {
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			FileInputStream fis = new FileInputStream(f);
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			in = new ObjectInputStream(fis);
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			obj = in.readObject();
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		}
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		finally {
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			if(in != null) {
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				in.close();
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			}
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		}
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		Utils.info("De-serialization complete");
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		return obj;
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	}
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	/**
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	 *
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	 * @param dbFile
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	 * @throws Exception
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	 */
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	public static boolean delete(String dbFile) throws Exception {
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		File f = new File(dbFile);
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		if(f.exists()) {
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			return f.delete();
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		}
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		return true;
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	}
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}