com.ctc.wstx.io

Class UTF32Reader

java.lang.Object

java.io.Reader

com.ctc.wstx.io.UTF32Reader

All Implemented Interfaces:

Closeable, AutoCloseable, Readable

public final class UTF32Reader
extends Reader

Since JDK does not come with UTF-32/UCS-4, let's implement a simple decoder to use.

Field Summary

Fields

Modifier and Type	Field and Description
protected static char	CONVERT_LSEP_TO In xml 1.1, LSEP bit like \n, or \r.
protected static char	CONVERT_NEL_TO In xml 1.1, NEL (0x85) behaves much the way \n does (can be follow \r as part of the linefeed
protected byte[]	mByteBuffer
protected int	mByteBufferEnd Pointed to the end marker, that is, position one after the last valid available byte.
protected int	mBytePtr Pointer to the next available byte (if any), iff less than mByteBufferEnd
protected ReaderConfig	mConfig
protected char[]	mTmpBuf
protected static char	NULL_BYTE
protected static char	NULL_CHAR

Fields inherited from class java.io.Reader

lock

Constructor Summary

Constructors

Constructor and Description
UTF32Reader(ReaderConfig cfg, InputStream in, byte[] buf, int ptr, int len, boolean recycleBuffer, boolean isBigEndian)

Method Summary

Methods

Modifier and Type	Method and Description
protected boolean	canModifyBuffer() Method that can be used to see if we can actually modify the underlying buffer.
void	close()
void	freeBuffers() This method should be called along with (or instead of) normal close.
protected InputStream	getStream()
int	read() Although this method is implemented by the base class, AND it should never be called by Woodstox code, let's still implement it bit more efficiently just in case
int	read(char[] cbuf, int start, int len)
protected int	readBytes() Method for reading as many bytes from the underlying stream as possible (that fit in the buffer), to the beginning of the buffer.
protected int	readBytesAt(int offset) Method for reading as many bytes from the underlying stream as possible (that fit in the buffer considering offset), to the specified offset.
protected void	reportBounds(char[] cbuf, int start, int len)
protected void	reportInvalidXml11(int value, int bytePos, int charPos)
protected void	reportStrangeStream()
void	setXmlCompliancy(int xmlVersion) Method that can be called to indicate the xml conformance used when reading content using this reader.

Methods inherited from class java.io.Reader

mark, markSupported, read, read, ready, reset, skip

Methods inherited from class java.lang.Object

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

Field Detail

NULL_CHAR

protected static final char NULL_CHAR

See Also:

Constant Field Values

NULL_BYTE

protected static final char NULL_BYTE

See Also:

Constant Field Values

CONVERT_NEL_TO

protected static final char CONVERT_NEL_TO

In xml 1.1, NEL (0x85) behaves much the way \n does (can be follow \r as part of the linefeed

See Also:

Constant Field Values

CONVERT_LSEP_TO

protected static final char CONVERT_LSEP_TO

In xml 1.1, LSEP bit like \n, or \r. Need to choose one as the result. Let's use \n, for simplicity

See Also:

Constant Field Values

mConfig

protected final ReaderConfig mConfig

mByteBuffer

protected byte[] mByteBuffer

mBytePtr

protected int mBytePtr

Pointer to the next available byte (if any), iff less than mByteBufferEnd

mByteBufferEnd

protected int mByteBufferEnd

Pointed to the end marker, that is, position one after the last valid available byte.

mTmpBuf

protected char[] mTmpBuf

Constructor Detail

UTF32Reader

public UTF32Reader(ReaderConfig cfg,
           InputStream in,
           byte[] buf,
           int ptr,
           int len,
           boolean recycleBuffer,
           boolean isBigEndian)

Method Detail

setXmlCompliancy

public void setXmlCompliancy(int xmlVersion)

Method that can be called to indicate the xml conformance used when reading content using this reader. Some of the character validity checks need to be done at reader level, and sometimes they depend on xml level (for example, xml 1.1 has new linefeeds and both more and less restricted characters).

read

public int read(char[] cbuf,
       int start,
       int len)
         throws IOException

Specified by:

read in class Reader

Throws:

IOException

canModifyBuffer

protected final boolean canModifyBuffer()

Method that can be used to see if we can actually modify the underlying buffer. This is the case if we are managing the buffer, but not if it was just given to us.

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in class Reader

Throws:

IOException

read

public int read()
         throws IOException

Although this method is implemented by the base class, AND it should never be called by Woodstox code, let's still implement it bit more efficiently just in case

Overrides:

read in class Reader

Throws:

IOException

getStream

protected final InputStream getStream()

readBytes

protected final int readBytes()
                       throws IOException

Method for reading as many bytes from the underlying stream as possible (that fit in the buffer), to the beginning of the buffer.

Throws:

IOException

readBytesAt

protected final int readBytesAt(int offset)
                         throws IOException

Method for reading as many bytes from the underlying stream as possible (that fit in the buffer considering offset), to the specified offset.

Returns:

Number of bytes read, if any; -1 to indicate none available (that is, end of input)

Throws:

IOException

freeBuffers

public final void freeBuffers()

This method should be called along with (or instead of) normal close. After calling this method, no further reads should be tried. Method will try to recycle read buffers (if any).

reportBounds

protected void reportBounds(char[] cbuf,
                int start,
                int len)
                     throws IOException

Throws:

IOException

reportStrangeStream

protected void reportStrangeStream()
                            throws IOException

Throws:

IOException

reportInvalidXml11

protected void reportInvalidXml11(int value,
                      int bytePos,
                      int charPos)
                           throws IOException

Throws:

IOException