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java.io
Class CharArrayReader

java.lang.Object
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 +--java.io.Reader
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 +--java.io.CharArrayReader

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public class CharArrayReader

extends Reader

Untamed: This class implements a character buffer that can be used as a character-input stream.

Since:

JDK1.1

Version:

1.17, 12/03/01

Author:

Herb Jellinek

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buf

protected char[] buf

The character buffer.

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pos

protected int pos

The current buffer position.

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markedPos

protected int markedPos

The position of mark in buffer.

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count

protected int count

The index of the end of this buffer. There is not valid data at or beyond this index.

CharArrayReader

public CharArrayReader(char[] buf)

Enabled: 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)

Enabled: Create an CharArrayReader from the specified array of chars.

Parameters:

buf - Input buffer (not copied)

offset - Offset of the first char to read

length - Number of chars to read

ensureOpen

private void ensureOpen()
 throws IOException

Check to make sure that the stream has not been closed

IOException

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read

public int read()
 throws IOException

Enabled: Read a single character.

Overrides:

read in class Reader

Returns:

The character read, as an integer in the range 0 to 65535 (0x00-0xffff), or -1 if the end of the stream has been reached

IOException

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read

public int read(char[] b,
 int off,
 int len)
 throws IOException

Enabled: Read characters into a portion of an array.

Specified by:

read in class Reader

Parameters:

b - Destination buffer

off - Offset at which to start storing characters

len - Maximum number of characters to read

Returns:

The actual number of characters read, or -1 if the end of the stream has been reached

IOException

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skip

public long skip(long n)
 throws IOException

Enabled: Skip characters.

Overrides:

skip in class Reader

Parameters:

n - The number of characters to skip

Returns:

The number of characters actually skipped

IOException

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ready

public boolean ready()
 throws IOException

Enabled: Tell whether this stream is ready to be read. Character-array readers are always ready to be read.

Overrides:

ready in class 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.

IOException

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markSupported

public boolean markSupported()

Enabled: Tell whether this stream supports the mark() operation, which it does.

Overrides:

markSupported in class Reader

Returns:

true if and only if this stream supports the mark operation.

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mark

public void mark(int readAheadLimit)
 throws IOException

Enabled: Mark the present position in the stream. Subsequent calls to reset() will reposition the stream to this point.

Overrides:

mark in class 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.

IOException

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reset

public void reset()
 throws IOException

Enabled: Reset the stream to the most recent mark, or to the beginning if it has never been marked.

Overrides:

reset in class Reader

IOException

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close

public void close()

Enabled: Close the stream.

Specified by:

close in class Reader

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