FileHelper.java

/***** BEGIN LICENSE BLOCK *****
 * Version: CPL 1.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Common Public
 * License Version 1.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.eclipse.org/legal/cpl-v10.html
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * Copyright (C) 2006 Lukas Felber <lfelber@hsr.ch>
 * Copyright (C) 2006 Mirko Stocker <me@misto.ch>
 * Copyright (C) 2006 Thomas Corbat <tcorbat@hsr.ch>
 * 
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * use your version of this file under the terms of the CPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the CPL, the GPL or the LGPL.
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package org.rubypeople.rdt.refactoring.util;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;

public class FileHelper
{
	public static final String DEFAULT_LINE_DELIMITER = System.getProperty("line.separator"); //$NON-NLS-1$

	public static String getFileContent(String fileName)
	{
		FileReader reader = null;
		try
		{
			reader = new FileReader(fileName);
			return getReaderContent(reader);
		}
		catch (FileNotFoundException e)
		{
			e.printStackTrace();
		}
		finally
		{
			if (reader != null)
				try
				{
					reader.close();
				}
				catch (IOException e)
				{
					// ignore
				}
		}
		return null;
	}

	private static String getReaderContent(Reader reader)
	{
		try
		{
			StringBuilder contentBuilder = new StringBuilder();

			int character;
			while ((character = reader.read()) != -1)
			{
				contentBuilder.append((char) character);
			}
			return contentBuilder.toString();
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}
		return null;
	}

	public static String getLineDelimiter(String document)
	{

		for (int i = 0; i < document.length(); i++)
		{
			char currentChar = document.charAt(i);

			if (currentChar == '\r')
			{
				if (document.length() > i + 1 && document.charAt(i + 1) == '\n')
				{
					return "\r\n"; //$NON-NLS-1$
				}
				return "\r"; //$NON-NLS-1$
			}
			else if (currentChar == '\n')
			{
				return "\n"; //$NON-NLS-1$
			}
		}

		return DEFAULT_LINE_DELIMITER;
	}
}