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package com.splout.db.common;

/*
 * #%L
 * Splout SQL Server
 * %%
 * Copyright (C) 2012 Datasalt Systems S.L.
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see .
 * #L%
 */

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.thrift.TBase;
import org.apache.thrift.TException;
import org.apache.thrift.protocol.TBinaryProtocol;
import org.apache.thrift.transport.TIOStreamTransport;

/**
 * Simple class that makes it easy to write Thrift objects to disk.
 * 
 * @author Joel Meyer - simplified & modified by us
 */
public class ThriftWriter {
	/** File to write to. */
	protected final File file;

	/** For writing to the file. */
	private BufferedOutputStream bufferedOut;

	/** For binary serialization of objects. */
	private TBinaryProtocol binaryOut;

	/**
	 * Constructor.
	 * 
	 * @throws FileNotFoundException
	 */
	public ThriftWriter(File file) throws FileNotFoundException {
		this.file = file;
		open();
	}

	/**
	 * Open the file for writing.
	 */
	private void open() throws FileNotFoundException {
		bufferedOut = new BufferedOutputStream(new FileOutputStream(file), 2048);
		binaryOut = new TBinaryProtocol(new TIOStreamTransport(bufferedOut));
	}

	/**
	 * Write the object to disk.
	 */
	@SuppressWarnings("rawtypes")
	public void write(TBase t) throws IOException {
		try {
			t.write(binaryOut);
			bufferedOut.flush();
		} catch(TException e) {
			throw new IOException(e);
		}
	}

	/**
	 * Close the file stream.
	 */
	public void close() throws IOException {
		bufferedOut.close();
	}
}