All Implemented Interfaces:

Closeable, AutoCloseable, Readable

public class CharArrayReader extends Reader

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

Since:

1.1

• Field Summary

  Fields

  protected char[]

  protected int

  The index of the end of this buffer.

  protected int

  The position of mark in buffer.

  protected int

  The current buffer position.

• Constructor Summary

  Constructors

  CharArrayReader(char[] buf)

  Creates a CharArrayReader from the specified array of chars.

  CharArrayReader(char[] buf, int offset, int length)

  Creates a CharArrayReader from the specified array of chars.

• Method Summary

  void

  close()

  Closes the stream and releases any system resources associated with it.

  void

  mark(int readAheadLimit)

  Marks the present position in the stream.

  boolean

  Tells whether this stream supports the mark() operation, which it does.

  int

  read()

  Reads a single character.

  int

  read(char[] cbuf, int off, int len)

  Reads characters into a portion of an array.

  boolean

  ready()

  Tells whether this stream is ready to be read.

  void

  reset()

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

  long

  skip(long n)

  Methods declared in class java.lang.Object

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

• Field Details

  • buf

    protected char[] buf

    The character buffer.

  • pos

    protected int pos

    The current buffer position.

  • markedPos

    protected int markedPos

    The position of mark in buffer.

  • count

    protected int count

    The index of the end of this buffer. There is no valid data at or beyond this index.

• Constructor Details

  • CharArrayReader

    public CharArrayReader(char[] buf)

    Creates a CharArrayReader from the specified array of chars.

    Parameters:

    buf - Input buffer (not copied)

  • CharArrayReader

    public CharArrayReader(char[] buf, int offset, int length)

    Creates a 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.

    Parameters:

    buf - Input buffer (not copied)

    offset - Offset of the first char to read

    length - Number of chars to read

    Throws:

    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.

• Method Details

  • read

    Reads 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

    Throws:

    IOException - If an I/O error occurs

  • read

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

    Reads characters into a portion of an array.

    If len is zero, then no characters are read and 0 is returned; otherwise, there is an attempt to read at least one character. If no character is available because the stream is at its end, the value -1 is returned; otherwise, at least one character is read and stored into cbuf.

    Specified by:

    read in class Reader

    Parameters:

    cbuf - Destination buffer

    off - Offset at which to start storing characters

    len - Maximum number of characters to read

    Returns:

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

    Throws:

    IndexOutOfBoundsException - If off is negative, or len is negative, or len is greater than cbuf.length - off

    IOException - If an I/O error occurs

  • skip

    Skips characters. If the stream is already at its end before this method is invoked, then no characters are skipped and zero is returned.

    The n parameter may be negative, even though 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.

    Overrides:

    skip in class Reader

    Parameters:

    n - The number of characters to skip

    Returns:

    The number of characters actually skipped

    Throws:

    IOException - If an I/O error occurs

  • ready

    Tells 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.

    Throws:

    IOException - If an I/O error occurs

  • markSupported

    public boolean markSupported()

    Tells 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.

  • mark

    public void mark(int readAheadLimit) throws IOException

    Marks 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.

    Throws:

    IOException - If an I/O error occurs

  • reset

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

    Overrides:

    reset in class Reader

    Throws:

    IOException - If an I/O error occurs

  • close

    public void close()

    Closes the stream and releases any system resources associated with it. Once the stream has been closed, further read(), ready(), mark(), reset(), or skip() invocations will throw an IOException. Closing a previously closed stream has no effect. This method will block while there is another thread blocking on the reader.

    Specified by:

    close in interface AutoCloseable

    Specified by:

    close in interface Closeable

    Specified by:

    close in class Reader