Class CharArrayReader
- java.lang.Object
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- java.io.Reader
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- com.opensymphony.module.sitemesh.util.CharArrayReader
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- All Implemented Interfaces:
java.io.Closeable
,java.lang.AutoCloseable
,java.lang.Readable
public class CharArrayReader extends java.io.Reader
This class implements a character buffer that can be used as a character-input stream. Modified from the JDK source in that it gets rid of the ensureOpen() method, so we get unexpected behaviour if the reader is closed.The second modification is that since this class is used internally by FastPageParser in a single thread, we don't need any locking or synchronization. Using this class instead of the standard CharArrayReader improves FastPageParser performance by 15-20%.
- Author:
- Hani Suleiman
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Constructor Summary
Constructors Constructor Description CharArrayReader(char[] buf)
Create an CharArrayReader from the specified array of chars.CharArrayReader(char[] buf, int offset, int length)
Create an CharArrayReader from the specified array of chars.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
close()
Close the stream.void
mark(int readAheadLimit)
Mark the present position in the stream.boolean
markSupported()
Tell whether this stream supports the mark() operation, which it does.int
read()
Read a single character.int
read(char[] b, int off, int len)
Read characters into a portion of an array.boolean
ready()
Tell whether this stream is ready to be read.void
reset()
Reset the stream to the most recent mark, or to the beginning if it has never been marked.long
skip(long n)
Skip characters.
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Constructor Detail
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CharArrayReader
public CharArrayReader(char[] buf)
Create an CharArrayReader from the specified array of chars.- Parameters:
buf
- Input buffer (not copied)
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CharArrayReader
public CharArrayReader(char[] buf, int offset, int length)
Create an CharArrayReader from the specified array of chars.- Parameters:
buf
- Input buffer (not copied)offset
- Offset of the first char to readlength
- Number of chars to read
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Method Detail
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read
public int read() throws java.io.IOException
Read a single character.- Overrides:
read
in classjava.io.Reader
- Throws:
java.io.IOException
- If an I/O error occurs
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read
public int read(char[] b, int off, int len) throws java.io.IOException
Read characters into a portion of an array.- Specified by:
read
in classjava.io.Reader
- Parameters:
b
- Destination bufferoff
- Offset at which to start storing characterslen
- Maximum number of characters to read- Returns:
- The actual 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.- 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. Character-array readers are always ready to be read.- Overrides:
ready
in classjava.io.Reader
- 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, which it does.- 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 reposition the stream to this point.- Overrides:
mark
in classjava.io.Reader
- Parameters:
readAheadLimit
- Limit on the number of characters that may be read while still preserving the mark. Because the stream's input comes from a character array, there is no actual limit; hence this argument is ignored.- Throws:
java.io.IOException
- If an I/O error occurs
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reset
public void reset() throws java.io.IOException
Reset the stream to the most recent mark, or to the beginning if it has never been marked.- Overrides:
reset
in classjava.io.Reader
- Throws:
java.io.IOException
- If an I/O error occurs
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close
public void close()
Close the stream.- Specified by:
close
in interfacejava.lang.AutoCloseable
- Specified by:
close
in interfacejava.io.Closeable
- Specified by:
close
in classjava.io.Reader
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