package liquibase.util;

 import java.io.IOException;

 import java.io.InputStream;

 import java.io.InputStreamReader;

 import java.io.OutputStream;

 import java.io.Reader;

 /**

  * Utilities for working with streams.

  */

 public class StreamUtil {

     final public static String lineSeparator = System.getProperty("line.separator");

     public static String getLineSeparator() {

         return lineSeparator;

     }

     /**

      * Reads a stream until the end of file into a String and uses the machines default encoding to convert to

      * characters the bytes from the Stream.

      * 

      * @param ins

      *            The InputStream to read.

      * @return The contents of the input stream as a String

      * @throws IOException

      *             If there is an error reading the stream.

      */

     public static String getStreamContents(InputStream ins) throws IOException {

         InputStreamReader reader = new InputStreamReader(ins);

         return getReaderContents(reader);

     }

     /**

      * Reads a stream until the end of file into a String and uses the machines default encoding to convert to

      * characters the bytes from the Stream.

      * 

      * @param ins

      *            The InputStream to read.

      * @param charsetName

      *            The name of a supported {@link java.nio.charset.Charset </code>charset<code>}

      * @return The contents of the input stream as a String

      * @throws IOException

      *             If there is an error reading the stream.

      */

     public static String getStreamContents(InputStream ins, String charsetName) throws IOException {

         InputStreamReader reader = (charsetName != null) ? new InputStreamReader(ins, charsetName)

                 : new InputStreamReader(ins);

         return getReaderContents(reader);

     }

     /**

      * Reads all the characters into a String.

      * 

      * @param reader

      *            The Reader to read.

      * @return The contents of the input stream as a String

      * @throws IOException

      *             If there is an error reading the stream.

      */

     public static String getReaderContents(Reader reader) throws IOException {

         try {

             StringBuffer result = new StringBuffer();

             char[] buffer = new char[2048];

             int read;

             while ((read = reader.read(buffer)) > -1) {

                 result.append(buffer, 0, read);

             }

             return result.toString();

         } finally {

             try {

                 reader.close();

             } catch (IOException ioe) { // NOPMD

                 // can safely ignore

             }

         }

     }

     public static void copy(InputStream inputStream, OutputStream outputStream) throws IOException {

         byte[] bytes = new byte[1024];

         int r = inputStream.read(bytes);

         while (r > 0) {

             outputStream.write(bytes, 0, r);

             r = inputStream.read(bytes);

         }

     }

 }