H2 Database Engine 2.3.232 · org.h2.store.RangeReader

Modifier and Type	Field and Description
private long	limit
private final Reader	r

Access	Constructor and Description
public	RangeReader(Reader source reader r, long offset of the range offset, long length of the range limit) Creates new instance of range reader.

Method Summary

Modifier and Type	Method and Description
public void	close() Implements abstract java.io.Reader.close. Implements java.io.Closeable.close. Closes the stream and releases any system resources associated with it.
public void	mark(int 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. readAheadLimit) Overrides java.io.Reader.mark. Marks the present position in the stream.
public boolean	markSupported() Overrides java.io.Reader.markSupported. Tells whether this stream supports the mark() operation.
public int	read() Overrides java.io.Reader.read. Reads a single character.
public int	read(char[] Destination buffer cbuf, int Offset at which to start storing characters off, int Maximum number of characters to read len) Implements abstract java.io.Reader.read. Reads characters into a portion of an array.
public boolean	ready() Overrides java.io.Reader.ready. Tells whether this stream is ready to be read.
public void	reset() Overrides java.io.Reader.reset. Resets the stream.
public long	skip(long The number of characters to skip n) Overrides java.io.Reader.skip. Skips characters.

Inherited from java.io.Reader:: nullReader of read read transferTo

limit	back to summary
private long limit

r	back to summary
private final Reader r

RangeReader	back to summary
public RangeReader(Reader r, long offset, long limit) throws IOException Creates new instance of range reader. Parameters r:Reader source reader offset:long offset of the range limit:long length of the range Exceptions IOException: on I/O exception during seeking to the specified offset

Method Detail

close	back to summary
public void close() throws IOException Implements abstract java.io.Reader.close. Implements java.io.Closeable.close. Doc from java.io.Reader.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. Annotations @Override Exceptions IOException: If an I/O error occurs

back to summary

public void close() throws IOException

Implements abstract java.io.Reader.close.

Implements java.io.Closeable.close.

Doc from java.io.Reader.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.

Annotations

@Override

Exceptions

IOException:: If an I/O error occurs

mark	back to summary
public void mark(int readAheadLimit) throws IOException Overrides java.io.Reader.mark. Doc from java.io.Reader.mark. Marks 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. Parameters readAheadLimit:int 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. Annotations @Override Exceptions IOException: If the stream does not support mark(), or if some other I/O error occurs

mark

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public void mark(int readAheadLimit) throws IOException

Overrides java.io.Reader.mark.

Doc from java.io.Reader.mark.

Marks 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.

Parameters

readAheadLimit:int: 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.

Annotations

@Override

Exceptions

IOException:: If the stream does not support mark(), or if some other I/O error occurs

markSupported	back to summary
public boolean markSupported() Overrides java.io.Reader.markSupported. Doc from java.io.Reader.markSupported. Tells whether this stream supports the mark() operation. The default implementation always returns false. Subclasses should override this method. Returns:boolean true if and only if this stream supports the mark operation. Annotations @Override

markSupported

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public boolean markSupported()

Overrides java.io.Reader.markSupported.

Doc from java.io.Reader.markSupported.

Tells whether this stream supports the mark() operation. The default implementation always returns false. Subclasses should override this method.

Returns:boolean

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

Annotations

@Override

read back to summary

read	back to summary
public int read() throws IOException Overrides java.io.Reader.read. Doc from java.io.Reader.read. Reads 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. Returns:int 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 Annotations @Override Exceptions IOException: If an I/O error occurs

public int read() throws IOException

Overrides java.io.Reader.read.

Doc from java.io.Reader.read.

Reads 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.

Returns:int

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

Annotations

@Override

Exceptions

IOException:: If an I/O error occurs

read back to summary

read	back to summary
public int read(char[] cbuf, int off, int len) throws IOException Implements abstract java.io.Reader.read. Doc from java.io.Reader.read. Reads 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. 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`. Parameters cbuf:char[] Destination buffer off:int Offset at which to start storing characters len:int Maximum number of characters to read Returns:int The number of characters read, or -1 if the end of the stream has been reached Annotations @Override Exceptions IOException: If an I/O error occurs

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

Implements abstract java.io.Reader.read.

Doc from java.io.Reader.read.

Reads 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.

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.

Parameters

cbuf:char[]: Destination buffer
off:int: Offset at which to start storing characters
len:int: Maximum number of characters to read

Returns:int

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

Annotations

@Override

Exceptions

IOException:: If an I/O error occurs

ready	back to summary
public boolean ready() throws IOException Overrides java.io.Reader.ready. Doc from java.io.Reader.ready. Tells whether this stream is ready to be read. Returns:boolean 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. Annotations @Override Exceptions IOException: If an I/O error occurs

ready

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public boolean ready() throws IOException

Overrides java.io.Reader.ready.

Doc from java.io.Reader.ready.

Tells whether this stream is ready to be read.

Returns:boolean

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.

Annotations

@Override

Exceptions

IOException:: If an I/O error occurs

reset	back to summary
public void reset() throws IOException Overrides java.io.Reader.reset. Doc from java.io.Reader.reset. Resets 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(). Annotations @Override Exceptions 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

reset

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public void reset() throws IOException

Overrides java.io.Reader.reset.

Doc from java.io.Reader.reset.

Resets 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().

Annotations

@Override

Exceptions

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

skip	back to summary
public long skip(long n) throws IOException Overrides java.io.Reader.skip. Doc from java.io.Reader.skip. Skips characters. This method will block until some characters are available, an I/O error occurs, or the end of the stream is reached. If the stream is already at its end before this method is invoked, then no characters are skipped and zero is returned. Parameters n:long The number of characters to skip Returns:long The number of characters actually skipped Annotations @Override Exceptions IOException: If an I/O error occurs

skip

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public long skip(long n) throws IOException

Overrides java.io.Reader.skip.

Doc from java.io.Reader.skip.

Skips characters. This method will block until some characters are available, an I/O error occurs, or the end of the stream is reached. If the stream is already at its end before this method is invoked, then no characters are skipped and zero is returned.

Parameters

n:long: The number of characters to skip

Returns:long

The number of characters actually skipped

Annotations

@Override

Exceptions

IOException:: If an I/O error occurs

public final Class RangeReader

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Method Summary

Field Detail

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