FileUtil.java

/*******************************************************************************
 * Copyright (c) 2004, 2007 Boeing.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Boeing - initial API and implementation
 *******************************************************************************/
package org.eclipse.nebula.widgets.xviewer.util.internal;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.logging.Level;
import org.eclipse.nebula.widgets.xviewer.Activator;
import org.eclipse.nebula.widgets.xviewer.util.XViewerException;

/**
 * @author Donald G. Dunne
 */
public class FileUtil {

   public static String justFilename(String filename) {
      File file = new File(filename);
      return file.getName();
   }

   public static String justPath(String filename) {
      File file = new File(filename);
      filename = filename.replaceAll(file.getName(), ""); //$NON-NLS-1$
      return filename;
   }

   /**
    * Use the Lib method directly - the original implementation of this method was not memory efficient and suppressed
    * exceptions
    * 
    * @throws IOException
    */
   public static String readFile(String filename) throws XViewerException {
      return readFile(new File(filename));
   }

   /**
    * Use the Lib method directly - the original implementation of this method was not memory efficient and suppressed
    * exceptions
    * 
    * @throws IOException
    */
   public static String readFile(File file) throws XViewerException {
      return fileToString(file);
   }

   public static String fileToString(File file) throws XViewerException {
      try {
         StringBuffer buffer = new StringBuffer();
         Reader inStream = new InputStreamReader(new FileInputStream(file), "UTF-8"); //$NON-NLS-1$
         Reader in = new BufferedReader(inStream);
         int ch;
         while ((ch = in.read()) > -1) {
            buffer.append((char) ch);
         }
         in.close();
         return buffer.toString();
      } catch (IOException ex) {
         throw new XViewerException(ex);
      }
   }

   public static void writeStringToFile(String str, File file) throws IOException {
      OutputStreamWriter out = new OutputStreamWriter(new FileOutputStream(file), "UTF-8"); //$NON-NLS-1$
      char[] chars = str.toCharArray();
      out.write(chars, 0, chars.length);
      out.close();
   }

   public static List<String> readListFromDir(File directory, FilenameFilter filter) {
      List<String> list = new ArrayList<String>(400);

      if (directory == null) {
         XViewerLog.log(Activator.class, Level.SEVERE, "Invalid directory path");
         return list;
      }

      File[] files = directory.listFiles(filter);
      if (files == null) {
         XViewerLog.log(Activator.class, Level.SEVERE, "Invalid path: " + directory);
         return list;
      }
      if (files.length > 0) {
         Arrays.sort(files);
      }

      for (int i = 0; i < files.length; i++) {
         list.add(files[i].getName());
      }

      return list;
   }

}