/**
 * Copyright 2008-2009 DRIVER PROJECT (ICM UW)
 * Original author: Marek Horst
 *
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package eu.dnetlib.data.sts.utils;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;

/**
 * File utilities.
 * 
 * @author Marek Horst
 * @version 0.7.6
 * 
 */
public class FileUtils {

	/**
	 * Returns file content for given path. Path might be absolute, relative
	 * file path or classpath.
	 * 
	 * @param filePath
	 * @return file content for given path
	 */
	public static String getFileContent(String filePath) {
		if (filePath == null)
			return null;
		try {
			File file = null;
			// added support for reading file content by web application
			URL fileURL = FileUtils.class.getResource("/" + filePath);
			if (fileURL != null) {
				file = new File(fileURL.getPath());
			} else
				file = new File(filePath);

			BufferedReader reader = new BufferedReader(new FileReader(file));
			StringBuffer strBuff = new StringBuffer();
			String line;
			while ((line = reader.readLine()) != null) {
				strBuff.append(line);
			}
			return strBuff.toString();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
			return null;
		} catch (IOException e) {
			e.printStackTrace();
			return null;
		}
	}

	/**
	 * Convert stream to string.
	 * 
	 * @param is
	 *            the is
	 * 
	 * @return the string
	 */
	public static String convertStreamToString(InputStream inputStream) {

		BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
		StringBuilder sb = new StringBuilder();

		String line = null;
		try {
			while ((line = reader.readLine()) != null) {
				sb.append(line + "\n");
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			//try {
				//reader.close();
			//} catch (IOException e) {
				//e.printStackTrace();
			//}
		}

		return sb.toString();
	}
	
	/**
	 * Convert stream to byte array.
	 * 
	 * @param inputStream the input stream
	 * 
	 * @return the byte[]
	 * @throws IOException 
	 */
	public static byte[] convertStreamToByteArray(InputStream inputStream) 
		throws IOException {

		int length = inputStream.available();
		if (length > Integer.MAX_VALUE) {
            throw new IOException("InputStream " +
            		"is to large, larger then Integer.MAX_VALUE");
        }
    
        byte[] bytes = new byte[length];

        int offset = 0;
        int numRead = 0;
        while ( (offset < bytes.length)
                &&
                ( (numRead=inputStream.read(bytes, offset, bytes.length-offset)) >= 0) ) {

            offset += numRead;

        }

        if (offset < bytes.length) {
            throw new IOException("Could not completely read InputStream ");
        }

        inputStream.close();
        return bytes;
	}

}