Class CheckedInputStream

java.lang.Object
- java.io.InputStream
- - java.io.FilterInputStream
  - - java.util.zip.CheckedInputStream

All Implemented Interfaces:: Closeable, AutoCloseable

public class CheckedInputStream
extends FilterInputStream

An input stream that also maintains a checksum of the data being read. The checksum can then be used to verify the integrity of the input data.

Since:: 1.1
See Also:: Checksum

Field Summary

Fields declared in class java.io.FilterInputStream

in

Constructor Summary

Constructors
Constructor	Description
`CheckedInputStream(InputStream in, Checksum cksum)`	Creates an input stream using the specified Checksum.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Checksum`	`getChecksum()`	Returns the Checksum for this input stream.
`int`	`read()`	Reads a byte.
`int`	`read(byte[] buf, int off, int len)`	Reads into an array of bytes.
`long`	`skip(long n)`	Skips specified number of bytes of input.

Methods declared in class java.io.FilterInputStream

available, close, mark, markSupported, read, reset

Methods declared in class java.io.InputStream

nullInputStream, readAllBytes, readNBytes, readNBytes, transferTo

Methods declared in class java.lang.Object

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

Constructor Detail

CheckedInputStream

public CheckedInputStream(InputStream in,
                          Checksum cksum)

Creates an input stream using the specified Checksum.

Parameters:: in - the input stream; cksum - the Checksum

Method Detail

read

public int read()
         throws IOException

Reads a byte. Will block if no input is available.

Overrides:: read in class FilterInputStream
Returns:: the byte read, or -1 if the end of the stream is reached.
Throws:: IOException - if an I/O error has occurred
See Also:: FilterInputStream.in

read

public int read(byte[] buf,
                int off,
                int len)
         throws IOException

Reads into an array of bytes. If len is not zero, the method blocks until some input is available; otherwise, no bytes are read and 0 is returned.

Overrides:: read in class FilterInputStream
Parameters:: buf - the buffer into which the data is read; off - the start offset in the destination array b; len - the maximum number of bytes read
Returns:: the actual number of bytes read, or -1 if the end of the stream is reached.
Throws:: NullPointerException - If buf is null.; IndexOutOfBoundsException - If off is negative, len is negative, or len is greater than buf.length - off; IOException - if an I/O error has occurred
See Also:: FilterInputStream.in

skip

public long skip(long n)
          throws IOException

Skips specified number of bytes of input.

Overrides:: skip in class FilterInputStream
Parameters:: n - the number of bytes to skip
Returns:: the actual number of bytes skipped
Throws:: IOException - if an I/O error has occurred

getChecksum

public Checksum getChecksum()

Returns the Checksum for this input stream.

Returns:: the Checksum value