CsvKippOutlet.java

package at.bakery.kippen.server.outlets;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;

/** JDK 6 or before. */
public class CsvKippOutlet extends AbstractKippOutlet{

	File aFile;

	/**
	 * @param filename
	 *            is an existing file which can be written to.
	 * @throws FileNotFoundException
	 *             if the file does not exist.
	 * @throws IOException
	 *             if problem encountered during write.
	 *             
	 */
	public CsvKippOutlet(String path, String filename) throws IOException, FileNotFoundException  {
		
		
		String pathFolder = System.getProperty(path);
		this.aFile = new File(pathFolder, filename);

		
		if (aFile == null) {
			throw new IllegalArgumentException("File should not be null.");
		}
		if (!aFile.exists()) {
			throw new FileNotFoundException("File does not exist: " + aFile);
		}
		if (!aFile.isFile()) {
			throw new IllegalArgumentException("Should not be a directory: "
					+ aFile);
		}
		if (!aFile.canWrite()) {
			throw new IllegalArgumentException("File cannot be written: "
					+ aFile);
		}
		
		
	}

	/**
	 * Fetch the entire contents of a text file, and return it in a String. This
	 * style of implementation does not throw Exceptions to the caller.
	 * 
	 * @param aFile
	 *            is a file which already exists and can be read.
	 */
	 public String getContents() {
		// ...checks on aFile are elided
		StringBuilder contents = new StringBuilder();

		try {
			// use buffering, reading one line at a time
			// FileReader always assumes default encoding is OK!
			BufferedReader input = new BufferedReader(new FileReader(aFile));
			try {
				String line = null; // not declared within while loop
				/*
				 * readLine is a bit quirky : it returns the content of a line
				 * MINUS the newline. it returns null only for the END of the
				 * stream. it returns an empty String if two newlines appear in
				 * a row.
				 */
				while ((line = input.readLine()) != null) {
					contents.append(line);
					contents.append(System.getProperty("line.separator"));
				}
			} finally {
				input.close();
			}
		} catch (IOException ex) {
			ex.printStackTrace();
		}

		return contents.toString();
	}



	public void output(String aContent) throws IOException {

		Writer output = new BufferedWriter(new FileWriter(aFile));
		try {
			// FileWriter always assumes default encoding is OK!
			output.write(aContent);
		} finally {
			output.close();
		}
		
	}

	@Override
	public void output() {
		// TODO Auto-generated method stub
		
	}

}