Package org.apache.jasper.xmlparser
Class UTF8Reader
- java.lang.Object
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- java.io.Reader
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- org.apache.jasper.xmlparser.UTF8Reader
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- All Implemented Interfaces:
java.io.Closeable
,java.lang.AutoCloseable
,java.lang.Readable
public class UTF8Reader extends java.io.Reader
- Version:
- $Id: UTF8Reader.java,v 1.4 2006/10/03 02:25:27 jluehe Exp $
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Field Summary
Fields Modifier and Type Field Description static int
DEFAULT_BUFFER_SIZE
Default byte buffer size (2048).protected byte[]
fBuffer
Byte buffer.protected java.io.InputStream
fInputStream
Input stream.protected int
fOffset
Offset into buffer.private int
fSurrogate
Surrogate character.
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Constructor Summary
Constructors Constructor Description UTF8Reader(java.io.InputStream inputStream, int size)
Constructs a UTF-8 reader from the specified input stream, buffer size and MessageFormatter.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
close()
Close the stream.private void
expectedByte(int position, int count)
Throws an exception for expected byte.private void
invalidByte(int position, int count, int c)
Throws an exception for invalid byte.private void
invalidSurrogate(int uuuuu)
Throws an exception for invalid surrogate bits.void
mark(int readAheadLimit)
Mark the present position in the stream.boolean
markSupported()
Tell whether this stream supports the mark() operation.int
read()
Read a single character.int
read(char[] ch, int offset, int length)
Read characters into a portion of an array.boolean
ready()
Tell whether this stream is ready to be read.void
reset()
Reset the stream.long
skip(long n)
Skip characters.
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Field Detail
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DEFAULT_BUFFER_SIZE
public static final int DEFAULT_BUFFER_SIZE
Default byte buffer size (2048).- See Also:
- Constant Field Values
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fInputStream
protected java.io.InputStream fInputStream
Input stream.
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fBuffer
protected byte[] fBuffer
Byte buffer.
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fOffset
protected int fOffset
Offset into buffer.
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fSurrogate
private int fSurrogate
Surrogate character.
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Method Detail
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read
public int read() throws java.io.IOException
Read a single character. This method will block until a character is available, an I/O error occurs, or the end of the stream is reached.Subclasses that intend to support efficient single-character input should override this method.
- Overrides:
read
in classjava.io.Reader
- Returns:
- The character read, as an integer in the range 0 to 16383 (0x00-0xffff), or -1 if the end of the stream has been reached
- Throws:
java.io.IOException
- If an I/O error occurs
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read
public int read(char[] ch, int offset, int length) throws java.io.IOException
Read characters into a portion of an array. This method will block until some input is available, an I/O error occurs, or the end of the stream is reached.- Specified by:
read
in classjava.io.Reader
- Parameters:
ch
- Destination bufferoffset
- Offset at which to start storing characterslength
- Maximum number of characters to read- Returns:
- The number of characters read, or -1 if the end of the stream has been reached
- Throws:
java.io.IOException
- If an I/O error occurs
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skip
public long skip(long n) throws java.io.IOException
Skip characters. This method will block until some characters are available, an I/O error occurs, or the end of the stream is reached.- Overrides:
skip
in classjava.io.Reader
- Parameters:
n
- The number of characters to skip- Returns:
- The number of characters actually skipped
- Throws:
java.io.IOException
- If an I/O error occurs
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ready
public boolean ready() throws java.io.IOException
Tell whether this stream is ready to be read.- Overrides:
ready
in classjava.io.Reader
- Returns:
- True if the next read() is guaranteed not to block for input, false otherwise. Note that returning false does not guarantee that the next read will block.
- Throws:
java.io.IOException
- If an I/O error occurs
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markSupported
public boolean markSupported()
Tell whether this stream supports the mark() operation.- Overrides:
markSupported
in classjava.io.Reader
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mark
public void mark(int readAheadLimit) throws java.io.IOException
Mark the present position in the stream. Subsequent calls to reset() will attempt to reposition the stream to this point. Not all character-input streams support the mark() operation.- Overrides:
mark
in classjava.io.Reader
- Parameters:
readAheadLimit
- Limit on the number of characters that may be read while still preserving the mark. After reading this many characters, attempting to reset the stream may fail.- Throws:
java.io.IOException
- If the stream does not support mark(), or if some other I/O error occurs
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reset
public void reset() throws java.io.IOException
Reset the stream. If the stream has been marked, then attempt to reposition it at the mark. If the stream has not been marked, then attempt to reset it in some way appropriate to the particular stream, for example by repositioning it to its starting point. Not all character-input streams support the reset() operation, and some support reset() without supporting mark().- Overrides:
reset
in classjava.io.Reader
- Throws:
java.io.IOException
- If the stream has not been marked, or if the mark has been invalidated, or if the stream does not support reset(), or if some other I/O error occurs
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close
public void close() throws java.io.IOException
Close the stream. Once a stream has been closed, further read(), ready(), mark(), or reset() invocations will throw an IOException. Closing a previously-closed stream, however, has no effect.- Specified by:
close
in interfacejava.lang.AutoCloseable
- Specified by:
close
in interfacejava.io.Closeable
- Specified by:
close
in classjava.io.Reader
- Throws:
java.io.IOException
- If an I/O error occurs
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expectedByte
private void expectedByte(int position, int count) throws java.io.UTFDataFormatException
Throws an exception for expected byte.- Throws:
java.io.UTFDataFormatException
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invalidByte
private void invalidByte(int position, int count, int c) throws java.io.UTFDataFormatException
Throws an exception for invalid byte.- Throws:
java.io.UTFDataFormatException
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invalidSurrogate
private void invalidSurrogate(int uuuuu) throws java.io.UTFDataFormatException
Throws an exception for invalid surrogate bits.- Throws:
java.io.UTFDataFormatException
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