EDIT

/**

* Copyright (C) 2009 EDIT

* European Distributed Institute of Taxonomy

* http://www.e-taxonomy.eu

*

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.cdm.common;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.StringBufferInputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import org.apache.log4j.Logger;

/**

 * @author a.kohlbecker

 * @since 16.12.2010

 *

 */

public class StreamUtils {

	public static final Logger logger = Logger.getLogger(StreamUtils.class);

	private static final int BUFFER_SIZE = 4096;

	/**

	 * Replaces each substring of this stream that matches the literal search sequence with the specified literal replace sequence.

	 * The replacement proceeds from the beginning of the stream to the end, for example, replacing "aa" with "b" in the string "aaa" will result in "ba" rather than "ab".

	 *

	 * @param stream

	 * @param search The sequence of char values to be replaced

	 * @param replace The replacement sequence of char values

	 * @return

	 * @throws IOException

	 *

	 */

	public static InputStream streamReplace(InputStream stream, String search,	String replace) throws IOException {

		InputStreamReader reader = new InputStreamReader(stream);

		StringBuilder strBuilder = new StringBuilder();

		char[] cbuf = new char[1024];

		int charsRead = -1;

		while ((charsRead = reader.read(cbuf)) > -1){

			strBuilder.append(cbuf, 0, charsRead);

		}

		String replacedContent = strBuilder.toString().replace(search, replace);

		StringBufferInputStream replacedStream = new StringBufferInputStream(replacedContent); //TODO replace with StringReader

		logger.debug(replacedContent);

		return replacedStream;

	}

	public static InputStream streamReplaceAll(InputStream stream, String regex, String replace) throws IOException {

		InputStreamReader reader = new InputStreamReader(stream);

		StringBuilder strBuilder = new StringBuilder();

		char[] cbuf = new char[1024];

		int charsRead = -1;

		while ((charsRead = reader.read(cbuf)) > -1){

			strBuilder.append(cbuf, 0, charsRead);

		}

		String replacedContent = strBuilder.toString().replaceAll(regex, replace);

		StringBufferInputStream replacedStream = new StringBufferInputStream(replacedContent); //TODO replace with StringReader

		logger.debug(replacedContent);

		return replacedStream;

	}

	public static String readToString(InputStream stream) throws IOException {

		InputStreamReader reader = new InputStreamReader(stream);

		StringBuilder strBuilder = new StringBuilder();

		char[] cbuf = new char[1024];

		int charsRead = -1;

		while ((charsRead = reader.read(cbuf)) > -1){

			strBuilder.append(cbuf, 0, charsRead);

		}

		return strBuilder.toString();

	}

	public static void downloadFile(URL url, String saveDir)

            throws IOException {

        HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();

        int responseCode = httpConn.getResponseCode();

        // always check HTTP response code first

        if (responseCode == HttpURLConnection.HTTP_OK) {

            String fileName = "";

            String disposition = httpConn.getHeaderField("Content-Disposition");

            if (disposition != null) {

                // extracts file name from header field

                int index = disposition.indexOf("filename=");

                if (index > 0) {

                    fileName = disposition.substring(index + 10,

                            disposition.length() - 1);

                }

            } else {

                // extracts file name from URL

                fileName = url.getFile().toString().substring(url.getFile().lastIndexOf("/") + 1,

                        url.getFile().length());

            }

            // opens input stream from the HTTP connection

            InputStream inputStream = httpConn.getInputStream();

            String saveFilePath = saveDir + File.separator + fileName;

            // opens an output stream to save into file

            FileOutputStream outputStream = new FileOutputStream(saveFilePath);

            int bytesRead = -1;

            byte[] buffer = new byte[BUFFER_SIZE];

            while ((bytesRead = inputStream.read(buffer)) != -1) {

                outputStream.write(buffer, 0, bytesRead);

            }

            outputStream.close();

            inputStream.close();

        } else {

           logger.error("No file to download. Server replied HTTP code: " + responseCode);

        }

        httpConn.disconnect();

    }

}