package foundation.version;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;

import foundation.dao.IFileReader;
import foundation.json.JObjectReader;

public class VersionedFileReader implements IFileReader {

	private VersionIndex index;
	

	public VersionedFileReader(VersionIndex index) {
		this.index = index;
	}

	@Override
	public JObjectReader getJSONObjectReader() throws Exception {
		String path = index.getPath();
		File file = new File(path);
		
		if (!file.exists()) {
			return new JObjectReader();
		}
		
		StringBuilder body = new StringBuilder();
		
		FileInputStream inputStream = new FileInputStream(file);
		try {
			BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "utf-8"));
			try {
				String line;
				while ((line = reader.readLine()) != null) {
					body.append(line);
				}
			}
			finally {
				reader.close();
			}
		}
		finally {
			try {
				inputStream.close();
			} catch (IOException e) {
			}
		}
		
		String content = body.toString();
		JObjectReader result = new JObjectReader(content);
		
		return result;
	}

}