Package com.helger.commons.io.stream

Class StreamHelper

java.lang.Object

com.helger.commons.io.stream.StreamHelper

@Immutable
public final class StreamHelper
extends Object

Some very basic IO stream utility stuff. All input stream (=reading) related stuff is quite null aware, where on writing an output stream may never be null.

Author:

Philip Helger

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	StreamHelper.CopyByteStreamBuilder	A simple builder to copy an InputStream (StreamHelper.CopyByteStreamBuilder.from(InputStream)) to an OutputStream (StreamHelper.CopyByteStreamBuilder.to(OutputStream)) with certain parameters.
static class	StreamHelper.CopyCharStreamBuilder	A simple builder to copy a Reader (StreamHelper.CopyCharStreamBuilder.from(Reader)) to an Writer (StreamHelper.CopyCharStreamBuilder.to(Writer)) with certain parameters.

Field Summary

Fields

Modifier and Type	Field	Description
static int	DEFAULT_BUFSIZE	buffer size for copy operations
static int	END_OF_STRING_MARKER

Method Summary

Modifier and Type	Method	Description
static InputStream	checkForInvalidFilterInputStream(InputStream aIS)
static ESuccess	close(AutoCloseable aCloseable)	Close the passed stream by encapsulating the declared IOException.
static ESuccess	closeWithoutFlush(AutoCloseable aCloseable)	Close the passed object, without trying to call flush on it.
static StreamHelper.CopyByteStreamBuilder	copyByteStream()
static StreamHelper.CopyCharStreamBuilder	copyCharStream()
static ESuccess	copyInputStreamToOutputStream(InputStream aIS, OutputStream aOS)	Pass the content of the given input stream to the given output stream.
static ESuccess	copyInputStreamToOutputStreamAndCloseOS(InputStream aIS, OutputStream aOS)	Pass the content of the given input stream to the given output stream.
static ESuccess	copyReaderToWriter(Reader aReader, Writer aWriter)	Pass the content of the given reader to the given writer.
static ESuccess	copyReaderToWriterAndCloseWriter(Reader aReader, Writer aWriter)	Pass the content of the given reader to the given writer.
static byte[]	createDefaultCopyBufferBytes()
static char[]	createDefaultCopyBufferChars()
static NonBlockingStringReader	createReader(char[] aChars)
static InputStreamReader	createReader(InputStream aIS, Charset aCharset)
static NonBlockingStringReader	createReader(String sText)
static OutputStreamWriter	createWriter(OutputStream aOS, Charset aCharset)
static ESuccess	flush(Flushable aFlushable)	Flush the passed object encapsulating the declared IOException.
static byte[]	getAllBytes(IHasInputStream aISP)	Read all bytes from the passed input stream into a byte array.
static byte[]	getAllBytes(InputStream aIS)	Read all bytes from the passed input stream into a byte array.
static String	getAllBytesAsString(IHasInputStream aISP, Charset aCharset)	Read all bytes from the passed input stream into a string.
static String	getAllBytesAsString(InputStream aIS, Charset aCharset)	Read all bytes from the passed input stream into a string.
static char[]	getAllCharacters(Reader aReader)	Read all characters from the passed reader into a char array.
static String	getAllCharactersAsString(Reader aReader)	Read all characters from the passed reader into a String.
static int	getAvailable(InputStream aIS)	Get the number of available bytes in the passed input stream.
static InputStream	getBuffered(InputStream aIS)
static OutputStream	getBuffered(OutputStream aOS)
static Reader	getBuffered(Reader aReader)
static Writer	getBuffered(Writer aWriter)
static NonBlockingByteArrayOutputStream	getCopy(InputStream aIS)	Get a byte buffer with all the available content of the passed input stream.
static NonBlockingStringWriter	getCopy(Reader aReader)
static NonBlockingByteArrayOutputStream	getCopyWithLimit(InputStream aIS, long nLimit)	Get a byte buffer with all the available content of the passed input stream.
static NonBlockingStringWriter	getCopyWithLimit(Reader aReader, long nLimit)
static boolean	isBuffered(InputStream aIS)
static boolean	isBuffered(OutputStream aOS)
static boolean	isBuffered(Reader aReader)
static boolean	isBuffered(Writer aWriter)
static boolean	isKnownEOFException(Class<?> aClass)	Check if the passed class is a known EOF exception class.
static boolean	isKnownEOFException(Throwable t)	Check if the passed exception is a known EOF exception.
static int	readFully(InputStream aIS, byte[] aBuffer)	Read the whole buffer from the input stream.
static int	readFully(InputStream aIS, byte[] aBuffer, int nOfs, int nLen)	Read the whole buffer from the input stream.
static String	readSafeUTF(DataInput aDI)	Because DataOutputStream.writeUTF(String) has a limit of 64KB this methods provides a similar solution for reading like DataInputStream.readUTF() but what was written in writeSafeUTF(DataOutput, String).
static ICommonsList<String>	readStreamLines(IHasInputStream aISP, Charset aCharset)	Get the content of the passed Spring resource as one big string in the passed character set.
static ICommonsList<String>	readStreamLines(IHasInputStream aISP, Charset aCharset, int nLinesToSkip, int nLinesToRead)	Get the content of the passed Spring resource as one big string in the passed character set.
static ICommonsList<String>	readStreamLines(InputStream aIS, Charset aCharset)	Get the content of the passed stream as a list of lines in the passed character set.
static ICommonsList<String>	readStreamLines(InputStream aIS, Charset aCharset, int nLinesToSkip, int nLinesToRead)	Get the content of the passed stream as a list of lines in the passed character set.
static void	readStreamLines(InputStream aIS, Charset aCharset, int nLinesToSkip, int nLinesToRead, Consumer<? super String> aLineCallback)	Read the content of the passed stream line by line and invoking a callback on all matching lines.
static void	readStreamLines(InputStream aIS, Charset aCharset, Consumer<? super String> aLineCallback)	Read the complete content of the passed stream and pass each line separately to the passed callback.
static void	readStreamLines(InputStream aIS, Charset aCharset, List<String> aTargetList)	Get the content of the passed stream as a list of lines in the passed character set.
static void	readUntilEOF(InputStream aIS, byte[] aBuffer, ObjIntConsumer<? super byte[]> aConsumer)
static void	readUntilEOF(InputStream aIS, ObjIntConsumer<? super byte[]> aConsumer)
static void	readUntilEOF(Reader aReader, char[] aBuffer, ObjIntConsumer<? super char[]> aConsumer)
static void	readUntilEOF(Reader aReader, ObjIntConsumer<? super char[]> aConsumer)
static void	skipFully(InputStream aIS, long nBytesToSkip)	Fully skip the passed amounts in the input stream.
static void	writeSafeUTF(DataOutput aDO, String sStr)	Because DataOutputStream.writeUTF(String) has a limit of 64KB this methods provides a similar solution but simply writing the bytes.
static ESuccess	writeStream(OutputStream aOS, byte[] aBuf)	Write bytes to an OutputStream.
static ESuccess	writeStream(OutputStream aOS, byte[] aBuf, int nOfs, int nLen)	Write bytes to an OutputStream.
static ESuccess	writeStream(OutputStream aOS, String sContent, Charset aCharset)	Write bytes to an OutputStream.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_BUFSIZE

public static final int DEFAULT_BUFSIZE

buffer size for copy operations

See Also:

Constant Field Values

END_OF_STRING_MARKER

public static final int END_OF_STRING_MARKER

See Also:

Constant Field Values

Method Detail

isKnownEOFException

public static boolean isKnownEOFException(@Nullable
                                          Throwable t)

Check if the passed exception is a known EOF exception.

Parameters:

t - The throwable/exception to be checked. May be null.

Returns:

true if it is a user-created EOF exception

isKnownEOFException

public static boolean isKnownEOFException(@Nullable
                                          Class<?> aClass)

Check if the passed class is a known EOF exception class.

Parameters:

aClass - The class to be checked. May be null.

Returns:

true if it is a known EOF exception class.

closeWithoutFlush

@Nonnull
public static ESuccess closeWithoutFlush(@Nullable @WillClose
                                         AutoCloseable aCloseable)

Close the passed object, without trying to call flush on it.

Parameters:

aCloseable - The object to be closed. May be null.

Returns:

ESuccess.SUCCESS if the object was successfully closed.

close

@Nonnull
public static ESuccess close(@Nullable @WillClose
                             AutoCloseable aCloseable)

Close the passed stream by encapsulating the declared IOException. If the passed object also implements the Flushable interface, it is tried to be flushed before it is closed.

Parameters:

aCloseable - The object to be closed. May be null.

Returns:

ESuccess if the object was successfully closed.

flush

@Nonnull
public static ESuccess flush(@Nullable
                             Flushable aFlushable)

Flush the passed object encapsulating the declared IOException.

Parameters:

aFlushable - The flushable to be flushed. May be null.

Returns:

ESuccess.SUCCESS if the object was successfully flushed.

createDefaultCopyBufferBytes

@Nonnull
@ReturnsMutableCopy
public static byte[] createDefaultCopyBufferBytes()

Returns:

A newly created copy buffer using DEFAULT_BUFSIZE. Never null.

Since:

9.3.6

copyInputStreamToOutputStream

@Nonnull
public static ESuccess copyInputStreamToOutputStream(@WillClose @Nullable
                                                     InputStream aIS,
                                                     @WillNotClose @Nullable
                                                     OutputStream aOS)

Pass the content of the given input stream to the given output stream. The input stream is automatically closed, whereas the output stream stays open!

Parameters:

aIS - The input stream to read from. May be null. Automatically closed!

aOS - The output stream to write to. May be null. Not automatically closed!

Returns:

ESuccess.SUCCESS if copying took place, ESuccess.FAILURE otherwise

copyInputStreamToOutputStreamAndCloseOS

@Nonnull
public static ESuccess copyInputStreamToOutputStreamAndCloseOS(@WillClose @Nullable
                                                               InputStream aIS,
                                                               @WillClose @Nullable
                                                               OutputStream aOS)

Pass the content of the given input stream to the given output stream. Both the input stream and the output stream are automatically closed.

Parameters:

aIS - The input stream to read from. May be null. Automatically closed!

aOS - The output stream to write to. May be null. Automatically closed!

Returns:

ESuccess.SUCCESS if copying took place, ESuccess.FAILURE otherwise

copyByteStream

@Nonnull
public static StreamHelper.CopyByteStreamBuilder copyByteStream()

Returns:

A new StreamHelper.CopyByteStreamBuilder. Never null.

getAvailable

public static int getAvailable(@Nullable
                               InputStream aIS)

Get the number of available bytes in the passed input stream.

Parameters:

aIS - The input stream to use. May be null.

Returns:

0 in case of an error or if the parameter was null.

getCopy

@Nullable
public static NonBlockingByteArrayOutputStream getCopy(@Nonnull @WillClose
                                                       InputStream aIS)

Get a byte buffer with all the available content of the passed input stream.

Parameters:

aIS - The source input stream. May not be null.

Returns:

A new NonBlockingByteArrayOutputStream with all available content inside. The OutputStream must be closed by the caller since v10. Since v9.3.6 this method returns null if copying fails.

getCopyWithLimit

@Nullable
public static NonBlockingByteArrayOutputStream getCopyWithLimit(@Nonnull @WillClose
                                                                InputStream aIS,
                                                                @Nonnegative
                                                                long nLimit)

Get a byte buffer with all the available content of the passed input stream.

Parameters:

aIS - The source input stream. May not be null.

nLimit - The maximum number of bytes to be copied to the output stream. Must be ≥ 0.

Returns:

A new NonBlockingByteArrayOutputStream with all available content inside. The OutputStream must be closed by the caller since v10. Since v9.3.6 this method returns null if copying fails.

getAllBytes

@Nullable
public static byte[] getAllBytes(@Nullable
                                 IHasInputStream aISP)

Read all bytes from the passed input stream into a byte array.

Parameters:

aISP - The input stream provider to read from. May be null .

Returns:

The byte array or null if the parameter or the resolved input stream is null.

getAllBytes

@Nullable
public static byte[] getAllBytes(@Nullable @WillClose
                                 InputStream aIS)

Read all bytes from the passed input stream into a byte array.

Parameters:

aIS - The input stream to read from. May be null.

Returns:

The byte array or null if the input stream is null.

getAllBytesAsString

@Nullable
public static String getAllBytesAsString(@Nullable
                                         IHasInputStream aISP,
                                         @Nonnull @Nonempty
                                         Charset aCharset)

Read all bytes from the passed input stream into a string.

Parameters:

aISP - The input stream provider to read from. May be null .

aCharset - The charset to use. May not be null .

Returns:

The String or null if the parameter or the resolved input stream is null.

getAllBytesAsString

@Nullable
public static String getAllBytesAsString(@Nullable @WillClose
                                         InputStream aIS,
                                         @Nonnull @Nonempty
                                         Charset aCharset)

Read all bytes from the passed input stream into a string.

Parameters:

aIS - The input stream to read from. May be null.

aCharset - The charset to use. May not be null .

Returns:

The String or null if the input stream is null.

createDefaultCopyBufferChars

@Nonnull
@ReturnsMutableCopy
public static char[] createDefaultCopyBufferChars()

Returns:

A newly created copy buffer using DEFAULT_BUFSIZE. Never null.

Since:

9.3.6

copyReaderToWriter

@Nonnull
public static ESuccess copyReaderToWriter(@WillClose @Nullable
                                          Reader aReader,
                                          @WillNotClose @Nullable
                                          Writer aWriter)

Pass the content of the given reader to the given writer. The reader is automatically closed, whereas the writer stays open!

Parameters:

aReader - The reader to read from. May be null. Automatically closed!

aWriter - The writer to write to. May be null. Not automatically closed!

Returns:

ESuccess.SUCCESS if copying took place, ESuccess.FAILURE otherwise

copyReaderToWriterAndCloseWriter

@Nonnull
public static ESuccess copyReaderToWriterAndCloseWriter(@Nullable @WillClose
                                                        Reader aReader,
                                                        @Nullable @WillClose
                                                        Writer aWriter)

Pass the content of the given reader to the given writer. The reader and the writer are automatically closed!

Parameters:

aReader - The reader to read from. May be null. Automatically closed!

aWriter - The writer to write to. May be null. Automatically closed!

Returns:

ESuccess.SUCCESS if copying took place, ESuccess.FAILURE otherwise

copyCharStream

@Nonnull
public static StreamHelper.CopyCharStreamBuilder copyCharStream()

Returns:

A new StreamHelper.CopyCharStreamBuilder. Never null.

getCopy

@Nullable
public static NonBlockingStringWriter getCopy(@Nonnull @WillClose
                                              Reader aReader)

getCopyWithLimit

@Nullable
public static NonBlockingStringWriter getCopyWithLimit(@Nonnull @WillClose
                                                       Reader aReader,
                                                       @Nonnegative
                                                       long nLimit)

getAllCharacters

@Nullable
public static char[] getAllCharacters(@Nullable @WillClose
                                      Reader aReader)

Read all characters from the passed reader into a char array.

Parameters:

aReader - The reader to read from. May be null.

Returns:

The character array or null if the reader is null.

getAllCharactersAsString

@Nullable
public static String getAllCharactersAsString(@Nullable @WillClose
                                              Reader aReader)

Read all characters from the passed reader into a String.

Parameters:

aReader - The reader to read from. May be null.

Returns:

The character array or null if the reader is null.

readStreamLines

@Nullable
@ReturnsMutableCopy
public static ICommonsList<String> readStreamLines(@Nullable
                                                   IHasInputStream aISP,
                                                   @Nonnull
                                                   Charset aCharset)

Get the content of the passed Spring resource as one big string in the passed character set.

Parameters:

aISP - The resource to read. May not be null.

aCharset - The character set to use. May not be null.

Returns:

null if the resolved input stream is null , the content otherwise.

readStreamLines

@Nullable
@ReturnsMutableCopy
public static ICommonsList<String> readStreamLines(@Nullable
                                                   IHasInputStream aISP,
                                                   @Nonnull
                                                   Charset aCharset,
                                                   @Nonnegative
                                                   int nLinesToSkip,
                                                   @CheckForSigned
                                                   int nLinesToRead)

Get the content of the passed Spring resource as one big string in the passed character set.

Parameters:

aISP - The resource to read. May be null.

aCharset - The character set to use. May not be null.

nLinesToSkip - The 0-based index of the first line to read. Pass in 0 to indicate to read everything.

nLinesToRead - The number of lines to read. Pass in CGlobal.ILLEGAL_UINT to indicate that all lines should be read. If the number passed here exceeds the number of lines in the file, nothing happens.

Returns:

null if the resolved input stream is null , the content otherwise.

readStreamLines

@Nullable
@ReturnsMutableCopy
public static ICommonsList<String> readStreamLines(@WillClose @Nullable
                                                   InputStream aIS,
                                                   @Nonnull @Nonempty
                                                   Charset aCharset)

Get the content of the passed stream as a list of lines in the passed character set.

Parameters:

aIS - The input stream to read from. May be null.

aCharset - The character set to use. May not be null.

Returns:

null if the input stream is null, the content lines otherwise.

readStreamLines

public static void readStreamLines(@WillClose @Nullable
                                   InputStream aIS,
                                   @Nonnull
                                   Charset aCharset,
                                   @Nonnull
                                   List<String> aTargetList)

Get the content of the passed stream as a list of lines in the passed character set.

Parameters:

aIS - The input stream to read from. May be null.

aCharset - The character set to use. May not be null.

aTargetList - The list to be filled with the lines. May not be null.

readStreamLines

@Nullable
@ReturnsMutableCopy
public static ICommonsList<String> readStreamLines(@WillClose @Nullable
                                                   InputStream aIS,
                                                   @Nonnull
                                                   Charset aCharset,
                                                   @Nonnegative
                                                   int nLinesToSkip,
                                                   @CheckForSigned
                                                   int nLinesToRead)

Get the content of the passed stream as a list of lines in the passed character set.

Parameters:

aIS - The input stream to read from. May be null.

aCharset - The character set to use. May not be null.

nLinesToSkip - The 0-based index of the first line to read. Pass in 0 to indicate to read everything.

nLinesToRead - The number of lines to read. Pass in CGlobal.ILLEGAL_UINT to indicate that all lines should be read. If the number passed here exceeds the number of lines in the file, nothing happens.

Returns:

null if the input stream is null, the content lines otherwise.

readStreamLines

public static void readStreamLines(@WillClose @Nullable
                                   InputStream aIS,
                                   @Nonnull @Nonempty
                                   Charset aCharset,
                                   @Nonnull
                                   Consumer<? super String> aLineCallback)

Read the complete content of the passed stream and pass each line separately to the passed callback.

Parameters:

aIS - The input stream to read from. May be null.

aCharset - The character set to use. May not be null.

aLineCallback - The callback that is invoked for all read lines. Each passed line does NOT contain the line delimiter!

readStreamLines

public static void readStreamLines(@WillClose @Nullable
                                   InputStream aIS,
                                   @Nonnull @Nonempty
                                   Charset aCharset,
                                   @Nonnegative
                                   int nLinesToSkip,
                                   int nLinesToRead,
                                   @Nonnull
                                   Consumer<? super String> aLineCallback)

Read the content of the passed stream line by line and invoking a callback on all matching lines.

Parameters:

aIS - The input stream to read from. May be null.

aCharset - The character set to use. May not be null.

nLinesToSkip - The 0-based index of the first line to read. Pass in 0 to indicate to read everything.

nLinesToRead - The number of lines to read. Pass in CGlobal.ILLEGAL_UINT to indicate that all lines should be read. If the number passed here exceeds the number of lines in the file, nothing happens.

aLineCallback - The callback that is invoked for all read lines. Each passed line does NOT contain the line delimiter! Note: it is not invoked for skipped lines!

writeStream

@Nonnull
public static ESuccess writeStream(@WillClose @Nonnull
                                   OutputStream aOS,
                                   @Nonnull
                                   byte[] aBuf,
                                   @Nonnegative
                                   int nOfs,
                                   @Nonnegative
                                   int nLen)

Write bytes to an OutputStream.

Parameters:

aOS - The output stream to write to. May not be null. Is closed independent of error or success.

aBuf - The byte array from which is to be written. May not be null.

nOfs - The 0-based index to the first byte in the array to be written. May not be < 0.

nLen - The non-negative amount of bytes to be written. May not be < 0.

Returns:

ESuccess

writeStream

@Nonnull
public static ESuccess writeStream(@WillClose @Nonnull
                                   OutputStream aOS,
                                   @Nonnull
                                   byte[] aBuf)

Write bytes to an OutputStream.

Parameters:

aOS - The output stream to write to. May not be null. Is closed independent of error or success.

aBuf - The byte array to be written. May not be null.

Returns:

ESuccess

writeStream

@Nonnull
public static ESuccess writeStream(@WillClose @Nonnull
                                   OutputStream aOS,
                                   @Nonnull
                                   String sContent,
                                   @Nonnull
                                   Charset aCharset)

Write bytes to an OutputStream.

Parameters:

aOS - The output stream to write to. May not be null. Is closed independent of error or success.

sContent - The string to be written. May not be null.

aCharset - The charset to be used, to convert the String to a byte array.

Returns:

ESuccess

createReader

@Nonnull
public static NonBlockingStringReader createReader(@Nonnull
                                                   String sText)

createReader

@Nonnull
public static NonBlockingStringReader createReader(@Nonnull
                                                   char[] aChars)

createReader

@Nullable
public static InputStreamReader createReader(@Nullable
                                             InputStream aIS,
                                             @Nonnull
                                             Charset aCharset)

createWriter

@Nullable
public static OutputStreamWriter createWriter(@Nullable
                                              OutputStream aOS,
                                              @Nonnull
                                              Charset aCharset)

skipFully

public static void skipFully(@Nonnull
                             InputStream aIS,
                             @Nonnegative
                             long nBytesToSkip)
                      throws IOException

Fully skip the passed amounts in the input stream. Only forward skipping is possible!

Parameters:

aIS - The input stream to skip in.

nBytesToSkip - The number of bytes to skip. Must be ≥ 0.

Throws:

IOException - In case something goes wrong internally

readFully

@Nonnegative
public static int readFully(@Nonnull
                            InputStream aIS,
                            @Nonnull
                            byte[] aBuffer)
                     throws IOException

Read the whole buffer from the input stream.

Parameters:

aIS - The input stream to read from. May not be null.

aBuffer - The buffer to write to. May not be null. Must be ≥ than the content to be read.

Returns:

The number of read bytes

Throws:

IOException - In case reading fails

readFully

@Nonnegative
public static int readFully(@Nonnull @WillNotClose
                            InputStream aIS,
                            @Nonnull
                            byte[] aBuffer,
                            @Nonnegative
                            int nOfs,
                            @Nonnegative
                            int nLen)
                     throws IOException

Read the whole buffer from the input stream.

Parameters:

aIS - The input stream to read from. May not be null.

aBuffer - The buffer to write to. May not be null. Must be ≥ than the content to be read.

nOfs - The offset into the destination buffer to use. May not be < 0.

nLen - The number of bytes to read into the destination buffer to use. May not be < 0.

Returns:

The number of read bytes

Throws:

IOException - In case reading fails

readUntilEOF

public static void readUntilEOF(@Nonnull @WillClose
                                InputStream aIS,
                                @Nonnull
                                ObjIntConsumer<? super byte[]> aConsumer)
                         throws IOException

Throws:

IOException

readUntilEOF

public static void readUntilEOF(@Nonnull @WillClose
                                InputStream aIS,
                                @Nonnull
                                byte[] aBuffer,
                                @Nonnull
                                ObjIntConsumer<? super byte[]> aConsumer)
                         throws IOException

Throws:

IOException

readUntilEOF

public static void readUntilEOF(@Nonnull @WillClose
                                Reader aReader,
                                @Nonnull
                                ObjIntConsumer<? super char[]> aConsumer)
                         throws IOException

Throws:

IOException

readUntilEOF

public static void readUntilEOF(@Nonnull @WillClose
                                Reader aReader,
                                @Nonnull
                                char[] aBuffer,
                                @Nonnull
                                ObjIntConsumer<? super char[]> aConsumer)
                         throws IOException

Throws:

IOException

isBuffered

public static boolean isBuffered(@Nullable
                                 InputStream aIS)

getBuffered

@Nullable
public static InputStream getBuffered(@Nullable
                                      InputStream aIS)

isBuffered

public static boolean isBuffered(@Nullable
                                 OutputStream aOS)

getBuffered

@Nullable
public static OutputStream getBuffered(@Nullable
                                       OutputStream aOS)

isBuffered

public static boolean isBuffered(@Nullable
                                 Reader aReader)

getBuffered

@Nullable
public static Reader getBuffered(@Nullable
                                 Reader aReader)

isBuffered

public static boolean isBuffered(@Nullable
                                 Writer aWriter)

getBuffered

@Nullable
public static Writer getBuffered(@Nullable
                                 Writer aWriter)

checkForInvalidFilterInputStream

@Nullable
public static InputStream checkForInvalidFilterInputStream(@Nullable
                                                           InputStream aIS)

writeSafeUTF

public static void writeSafeUTF(@Nonnull
                                DataOutput aDO,
                                @Nullable
                                String sStr)
                         throws IOException

Because DataOutputStream.writeUTF(String) has a limit of 64KB this methods provides a similar solution but simply writing the bytes.

Parameters:

aDO - DataOutput to write to. May not be null.

sStr - The string to be written. May be null.

Throws:

IOException - on write error

See Also:

readSafeUTF(DataInput)

readSafeUTF

@Nullable
public static String readSafeUTF(@Nonnull
                                 DataInput aDI)
                          throws IOException

Because DataOutputStream.writeUTF(String) has a limit of 64KB this methods provides a similar solution for reading like DataInputStream.readUTF() but what was written in writeSafeUTF(DataOutput, String).

Parameters:

aDI - DataInput to read from. May not be null.

Returns:

The read string. May be null.

Throws:

IOException - on read error

See Also:

writeSafeUTF(DataOutput, String)