org.h2.util

Class IOUtils

java.lang.Object

org.h2.util.IOUtils

public class IOUtils
extends Object

This utility class contains input/output functions.

Method Summary

Methods

Modifier and Type	Method and Description
static void	closeSilently(InputStream in) Close an input stream without throwing an exception.
static void	closeSilently(OutputStream out) Close an output stream without throwing an exception.
static void	closeSilently(Reader reader) Close a reader without throwing an exception.
static void	closeSilently(Writer writer) Close a writer without throwing an exception.
static long	copy(InputStream in, OutputStream out) Copy all data from the input stream to the output stream.
static long	copy(InputStream in, OutputStream out, long length) Copy all data from the input stream to the output stream.
static long	copyAndClose(InputStream in, OutputStream out) Copy all data from the input stream to the output stream and close both streams.
static long	copyAndCloseInput(InputStream in, OutputStream out) Copy all data from the input stream to the output stream and close the input stream.
static long	copyAndCloseInput(Reader in, Writer out, long length) Copy all data from the reader to the writer and close the reader.
static Reader	getAsciiReader(InputStream in) Wrap an input stream in a reader.
static Reader	getBufferedReader(InputStream in) Create a buffered reader to read from an input stream using the UTF-8 format.
static Writer	getBufferedWriter(OutputStream out) Create a buffered writer to write to an output stream using the UTF-8 format.
static InputStream	getInputStreamFromString(String s) Create an input stream to read from a string.
static Reader	getReader(InputStream in) Create a reader to read from an input stream using the UTF-8 format.
static Reader	getReaderFromString(String s) Create a reader to read from a string.
static byte[]	readBytesAndClose(InputStream in, int length) Read a number of bytes from an input stream and close the stream.
static int	readFully(InputStream in, byte[] buffer, int off, int max) Try to read the given number of bytes to the buffer.
static int	readFully(Reader in, char[] buffer, int max) Try to read the given number of characters to the buffer.
static String	readStringAndClose(Reader in, int length) Read a number of characters from a reader and close it.
static void	skipFully(InputStream in, long skip) Skip a number of bytes in an input stream.
static void	skipFully(Reader reader, long skip) Skip a number of characters in a reader.
static void	trace(String method, String fileName, Object o) Trace input or output operations if enabled.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

closeSilently

public static void closeSilently(OutputStream out)

Close an output stream without throwing an exception.

Parameters:

out - the output stream or null

skipFully

public static void skipFully(InputStream in,
             long skip)
                      throws IOException

Skip a number of bytes in an input stream.

Parameters:

in - the input stream

skip - the number of bytes to skip

Throws:

EOFException - if the end of file has been reached before all bytes could be skipped

IOException - if an IO exception occurred while skipping

skipFully

public static void skipFully(Reader reader,
             long skip)
                      throws IOException

Skip a number of characters in a reader.

Parameters:

reader - the reader

skip - the number of characters to skip

Throws:

EOFException - if the end of file has been reached before all characters could be skipped

IOException - if an IO exception occurred while skipping

copyAndClose

public static long copyAndClose(InputStream in,
                OutputStream out)
                         throws IOException

Copy all data from the input stream to the output stream and close both streams. Exceptions while closing are ignored.

Parameters:

in - the input stream

out - the output stream

Returns:

the number of bytes copied

Throws:

IOException

copyAndCloseInput

public static long copyAndCloseInput(InputStream in,
                     OutputStream out)
                              throws IOException

Copy all data from the input stream to the output stream and close the input stream. Exceptions while closing are ignored.

Parameters:

in - the input stream

out - the output stream (null if writing is not required)

Returns:

the number of bytes copied

Throws:

IOException

copy

public static long copy(InputStream in,
        OutputStream out)
                 throws IOException

Copy all data from the input stream to the output stream. Both streams are kept open.

Parameters:

in - the input stream

out - the output stream (null if writing is not required)

Returns:

the number of bytes copied

Throws:

IOException

copy

public static long copy(InputStream in,
        OutputStream out,
        long length)
                 throws IOException

Copy all data from the input stream to the output stream. Both streams are kept open.

Parameters:

in - the input stream

out - the output stream (null if writing is not required)

length - the maximum number of bytes to copy

Returns:

the number of bytes copied

Throws:

IOException

copyAndCloseInput

public static long copyAndCloseInput(Reader in,
                     Writer out,
                     long length)
                              throws IOException

Copy all data from the reader to the writer and close the reader. Exceptions while closing are ignored.

Parameters:

in - the reader

out - the writer (null if writing is not required)

length - the maximum number of bytes to copy

Returns:

the number of characters copied

Throws:

IOException

closeSilently

public static void closeSilently(InputStream in)

Close an input stream without throwing an exception.

Parameters:

in - the input stream or null

closeSilently

public static void closeSilently(Reader reader)

Close a reader without throwing an exception.

Parameters:

reader - the reader or null

closeSilently

public static void closeSilently(Writer writer)

Close a writer without throwing an exception.

Parameters:

writer - the writer or null

readBytesAndClose

public static byte[] readBytesAndClose(InputStream in,
                       int length)
                                throws IOException

Read a number of bytes from an input stream and close the stream.

Parameters:

in - the input stream

length - the maximum number of bytes to read, or -1 to read until the end of file

Returns:

the bytes read

Throws:

IOException

readStringAndClose

public static String readStringAndClose(Reader in,
                        int length)
                                 throws IOException

Read a number of characters from a reader and close it.

Parameters:

in - the reader

length - the maximum number of characters to read, or -1 to read until the end of file

Returns:

the string read

Throws:

IOException

readFully

public static int readFully(InputStream in,
            byte[] buffer,
            int off,
            int max)
                     throws IOException

Try to read the given number of bytes to the buffer. This method reads until the maximum number of bytes have been read or until the end of file.

Parameters:

in - the input stream

buffer - the output buffer

off - the offset in the buffer

max - the number of bytes to read at most

Returns:

the number of bytes read, 0 meaning EOF

Throws:

IOException

readFully

public static int readFully(Reader in,
            char[] buffer,
            int max)
                     throws IOException

Try to read the given number of characters to the buffer. This method reads until the maximum number of characters have been read or until the end of file.

Parameters:

in - the reader

buffer - the output buffer

max - the number of characters to read at most

Returns:

the number of characters read

Throws:

IOException

getBufferedReader

public static Reader getBufferedReader(InputStream in)

Create a buffered reader to read from an input stream using the UTF-8 format. If the input stream is null, this method returns null. The InputStreamReader that is used here is not exact, that means it may read some additional bytes when buffering.

Parameters:

in - the input stream or null

Returns:

the reader

getReader

public static Reader getReader(InputStream in)

Create a reader to read from an input stream using the UTF-8 format. If the input stream is null, this method returns null. The InputStreamReader that is used here is not exact, that means it may read some additional bytes when buffering.

Parameters:

in - the input stream or null

Returns:

the reader

getBufferedWriter

public static Writer getBufferedWriter(OutputStream out)

Create a buffered writer to write to an output stream using the UTF-8 format. If the output stream is null, this method returns null.

Parameters:

out - the output stream or null

Returns:

the writer

getReaderFromString

public static Reader getReaderFromString(String s)

Create a reader to read from a string. If the string is null, this method returns null.

Parameters:

s - the string or null

Returns:

the reader

getAsciiReader

public static Reader getAsciiReader(InputStream in)

Wrap an input stream in a reader. The bytes are converted to characters using the US-ASCII character set.

Parameters:

in - the input stream

Returns:

the reader

trace

public static void trace(String method,
         String fileName,
         Object o)

Trace input or output operations if enabled.

Parameters:

method - the method from where this method was called

fileName - the file name

o - the object to append to the message

getInputStreamFromString

public static InputStream getInputStreamFromString(String s)

Create an input stream to read from a string. The string is converted to a byte array using UTF-8 encoding. If the string is null, this method returns null.

Parameters:

s - the string

Returns:

the input stream