FileUtils.java

package sushi;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.StringReader;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

/**
 * centralize file manipulation
 */
public class FileUtils {
	
	/**
	 * returns file name "/tmp/abc.txt" returns "abc"
	 */
	public static String getFileNameWithoutExtension(String filePath){
		File file = new File(filePath);
		String fileName = file.getName();
		fileName = fileName.replace(" ", "_");
		int index = fileName.lastIndexOf('.');
		return fileName.substring(0,index);	
	}
	
	/**
	 * reads file and concatenate content to a string 
	 */
	public static String getFileContentAsString(String filePath) throws IOException {
		StringBuffer fileData = new StringBuffer(1000);
		BufferedReader reader = new BufferedReader(new FileReader(filePath));
		char[] buf = new char[1024];
		int numRead=0;
		while((numRead=reader.read(buf)) != -1){
			String readData = String.valueOf(buf, 0, numRead);
			fileData.append(readData);
			buf = new char[1024];
		}
		reader.close();
		return fileData.toString();
	}
	
	/**
	 * save StreamResult to file given in path 
	 */
	public static void writeResultToFile(StreamResult result, String path) {
		String fileString = result.getWriter().toString();
		
		try {
			BufferedWriter out = new BufferedWriter(
					new FileWriter(path));
			out.write(fileString);
			out.close();
		} catch (IOException e) {
			e.printStackTrace();
		}		
	}
	
	/**
	 * returns Document from StreamResult 
	 */
	public static Document createDocumentFromResult(StreamResult result) {
		Document document = null;
		String fileString = result.getWriter().toString();
		try {
			DocumentBuilder parser = DocumentBuilderFactory.newInstance().newDocumentBuilder();
			StringReader reader = new StringReader(fileString);
			InputSource inputSource = new InputSource( reader );
			document = parser.parse(inputSource);
		} catch (SAXException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} catch (ParserConfigurationException e) {
			e.printStackTrace();
		}
		return document;
	}


}