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java.io
Class CharArrayReader
java.lang.Object
java.io.Reader
java.io.CharArrayReader
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All Implemented Interfaces:
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Closeable
,
Readable
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public class
CharArrayReader
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extends
Reader
This class implements a character buffer that can be used as a character-input stream.
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Since:
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JDK1.1
Field Summary
|
protected char[] |
buf
The character buffer. |
protected int |
count
The index of the end of this buffer. |
protected int |
markedPos
The position of mark in buffer. |
protected int |
pos
The current buffer position. |
Constructor Summary
|
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. |
Method Summary
|
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. |
Methods inherited from class java.lang.
Object
|
clone
,
equals
,
finalize
,
getClass
,
hashCode
,
notify
,
notifyAll
,
toString
,
wait
,
wait
,
wait
|
buf
protected char[] buf
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The character buffer.
pos
protected int pos
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The current buffer position.
markedPos
protected int markedPos
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The position of mark in buffer.
count
protected int count
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The index of the end of this buffer. There is not valid data at or beyond this index.
CharArrayReader
public CharArrayReader(char[] buf)
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Create an CharArrayReader from the specified array of chars.
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Parameters:
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buf - Input buffer (not copied)
CharArrayReader
public CharArrayReader(char[] buf,
int offset,
int length)
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Create an CharArrayReader from the specified array of chars.
The resulting reader will start reading at the given
offset
. The total number of
char
values that can be read from this reader will be either
length
or
buf.length-offset
, whichever is smaller.
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Parameters:
-
buf - Input buffer (not copied)
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offset - Offset of the first char to read
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length - Number of chars to read
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Throws:
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IllegalArgumentException
- If
offset
is negative or greater than
buf.length
, or if
length
is negative, or if the sum of these two values is negative.
read
public int read()
throws IOException
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Read a single character.
-
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Overrides:
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read
in class
Reader
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Returns:
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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
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Throws:
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IOException
- If an I/O error occurs
read
public int read(char[] b,
int off,
int len)
throws IOException
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Read characters into a portion of an array.
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Specified by:
-
read
in class
Reader
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Parameters:
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b - Destination buffer
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off - Offset at which to start storing characters
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len - Maximum number of characters to read
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Returns:
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The actual number of characters read, or -1 if the end of the stream has been reached
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Throws:
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IOException
- If an I/O error occurs
skip
public long skip(long n)
throws IOException
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Skip characters.
Returns the number of characters that were skipped.
The n parameter may be negative, even though the the skip method of the
Reader
superclass throws an exception in this case. If n is negative, then this method does nothing and returns 0.
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Overrides:
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skip
in class
Reader
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Parameters:
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n - The number of characters to skip
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Returns:
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The number of characters actually skipped
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Throws:
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IOException
- If
the stream is closed, or
an I/O error occurs
ready
public boolean ready()
throws IOException
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Tell whether this stream is ready to be read. Character-array readers are always ready to be read.
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Overrides:
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ready
in class
Reader
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Returns:
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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.
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Throws:
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IOException
- If an I/O error occurs
markSupported
public boolean markSupported()
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Tell whether this stream supports the mark() operation, which it does.
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Overrides:
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markSupported
in class
Reader
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Returns:
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true if and only if this stream supports the mark operation.
mark
public void mark(int readAheadLimit)
throws IOException
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Mark the present position in the stream. Subsequent calls to reset() will reposition the stream to this point.
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Overrides:
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mark
in class
Reader
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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.
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Throws:
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IOException
- If an I/O error occurs
reset
public void reset()
throws IOException
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Reset the stream to the most recent mark, or to the beginning if it has never been marked.
-
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Overrides:
-
reset
in class
Reader
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Throws:
-
IOException
- If an I/O error occurs
close
public void close()
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Close the stream.
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Specified by:
-
close
in interface
Closeable
-
Specified by:
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close
in class
Reader
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