Top Description Fields Constructors Methods
org.h2.store

public Class CountingReaderInputStream

extends InputStream
Class Inheritance
Imports
java.io.IOException, .InputStream, .Reader, java.nio.ByteBuffer, .CharBuffer, java.nio.charset.CharsetEncoder, .CodingErrorAction, .StandardCharsets, org.h2.engine.Constants
An input stream that reads the data from a reader and limits the number of bytes that can be read.

Field Summary

Modifier and TypeField and Description
private ByteBuffer
byteBuffer

private final CharBuffer
charBuffer

private final CharsetEncoder
encoder

private long
length

private final Reader
reader

private long
remaining

Constructor Summary

AccessConstructor and Description
public
CountingReaderInputStream(Reader reader, long maxLength)

Method Summary

Modifier and TypeMethod and Description
public void
close()

Overrides java.io.InputStream.close.

Implements java.io.Closeable.close.

Closes this input stream and releases any system resources associated with the stream.

private boolean
fetch()

private void
fillBuffer()

public long

Returns:

the number of characters
getLength()

The number of characters read so far (but there might still be some bytes in the buffer).

public int
read(byte[]
the buffer into which the data is read.
buff, int
the start offset in array b at which the data is written.
offset, int
the maximum number of bytes to read.
len)

Overrides java.io.InputStream.read.

Reads up to len bytes of data from the input stream into an array of bytes.

public int
read()

Implements abstract java.io.InputStream.read.

Reads the next byte of data from the input stream.

Inherited from java.io.InputStream:
availablemarkmarkSupportednullInputStreamreadreadAllBytesreadNBytesreadNBytesresetskipskipNBytestransferTo

Field Detail

byteBufferback to summary
private ByteBuffer byteBuffer
charBufferback to summary
private final CharBuffer charBuffer
encoderback to summary
private final CharsetEncoder encoder
lengthback to summary
private long length
readerback to summary
private final Reader reader
remainingback to summary
private long remaining

Constructor Detail

CountingReaderInputStreamback to summary
public CountingReaderInputStream(Reader reader, long maxLength)

Method Detail

closeback to summary
public void close() throws IOException

Overrides java.io.InputStream.close.

Implements java.io.Closeable.close.

Doc from java.io.InputStream.close.

Closes this input stream and releases any system resources associated with the stream.

Annotations
@Override
Exceptions
IOException:
if an I/O error occurs.
fetchback to summary
private boolean fetch() throws IOException
fillBufferback to summary
private void fillBuffer() throws IOException
getLengthback to summary
public long getLength()

The number of characters read so far (but there might still be some bytes in the buffer).

Returns:long

the number of characters

readback to summary
public int read(byte[] buff, int offset, int len) throws IOException

Overrides java.io.InputStream.read.

Doc from java.io.InputStream.read.

Reads up to len bytes of data from the input stream into an array of bytes. An attempt is made to read as many as len bytes, but a smaller number may be read. The number of bytes actually read is returned as an integer.

This method blocks until input data is available, end of file is detected, or an exception is thrown.

If len is zero, then no bytes are read and 0 is returned; otherwise, there is an attempt to read at least one byte. If no byte is available because the stream is at end of file, the value -1 is returned; otherwise, at least one byte is read and stored into b.

The first byte read is stored into element b[off], the next one into b[off+1], and so on. The number of bytes read is, at most, equal to len. Let k be the number of bytes actually read; these bytes will be stored in elements b[off] through b[off+k-1], leaving elements b[off+k] through b[off+len-1] unaffected.

In every case, elements b[0] through b[off-1] and elements b[off+len] through b[b.length-1] are unaffected.

Parameters
buff:byte[]

the buffer into which the data is read.

offset:int

the start offset in array b at which the data is written.

len:int

the maximum number of bytes to read.

Returns:int

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

Annotations
@Override
Exceptions
IOException:
If the first byte cannot be read for any reason other than end of file, or if the input stream has been closed, or if some other I/O error occurs.
readback to summary
public int read() throws IOException

Implements abstract java.io.InputStream.read.

Doc from java.io.InputStream.read.

Reads the next byte of data from the input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because the end of the stream has been reached, the value -1 is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

Returns:int

the next byte of data, or -1 if the end of the stream is reached.

Annotations
@Override
Exceptions
IOException:
if an I/O error occurs.