ConnectionImpl.java

package com.camile._3.impl;

import java.io.IOException;

import com.camile._3.api.Connection;
import com.camile._3.api.ConnectionException;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

public class ConnectionImpl implements Connection {

	private FileInputStream fis;
	private File file;

	public ConnectionImpl(String source) throws FileNotFoundException {
		file = new File(getClass().getClassLoader().getResource(source).getFile());
		fis = new FileInputStream(file);
	}

	@Override
	public byte[] read(int startPos, int endPos) throws IOException {
		fis.skip(startPos);
		byte[] content = new byte[endPos - startPos + 1];
		fis.read(content, 0, content.length);
		return content;
	}

	@Override	
	public int getContentLength() {
		return  (int)file.length();
	}

	@Override
	public void close() {
		try {
			fis.close();
		} catch (IOException e) {
			throw new ConnectionException("Fail for connection closed");
		}
	}
}