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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » java.io

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

java.io .InputStream

InputStream
abstract public class InputStream extends Object implements Closeable(Code)
	InputStream is an abstract class for all byte input streams. It provides basic method implementations for reading bytes from a stream. See Also: OutputStream

Constructor Summary
public	InputStream() This constructor does nothing interesting.

Method Summary
public int	available() Answers a int representing then number of bytes that are available before this InputStream will block.
public void	close() Close the InputStream.
public void	mark(int readlimit) Set a Mark position in this InputStream.
public boolean	markSupported() Answers a boolean indicating whether or not this InputStream supports mark() and reset().
abstract public int	read() Reads a single byte from this InputStream and returns the result as an int.
public int	read(byte b) Reads bytes from the Stream and stores them in byte array `b`. Answer the number of bytes actually read or -1 if no bytes were read and end of stream was encountered. Parameters: b - the byte array in which to store the read bytes.
public int	read(byte b, int offset, int length) Reads at most `length` bytes from the Stream and stores them in byte array `b` starting at `offset`.
public synchronized void	reset() Reset this InputStream to the last marked location.
public long	skip(long n) Skips `n` number of bytes in this InputStream.

Constructor Detail

InputStream
public InputStream()(Code)
	This constructor does nothing interesting. Provided for signature compatibility.

Method Detail

available
public int available() throws IOException(Code)
	Answers a int representing then number of bytes that are available before this InputStream will block. This method always returns 0. Subclasses should override and indicate the correct number of bytes available. the number of bytes available before blocking. throws: IOException - If an error occurs in this InputStream.

close
public void close() throws IOException(Code)
	Close the InputStream. Concrete implementations of this class should free any resources during close. This implementation does nothing. throws: IOException - If an error occurs attempting to close this InputStream.

mark
public void mark(int readlimit)(Code)
	Set a Mark position in this InputStream. The parameter `readLimit` indicates how many bytes can be read before a mark is invalidated. Sending reset() will reposition the Stream back to the marked position provided `readLimit` has not been surpassed. This default implementation does nothing and concrete subclasses must provide their own implementations. Parameters: readlimit - the number of bytes to be able to read before invalidating themark.

markSupported
public boolean markSupported()(Code)
	Answers a boolean indicating whether or not this InputStream supports mark() and reset(). This class provides a default implementation which answers false. `true` if mark() and reset() are supported,`false` otherwise.

read
abstract public int read() throws IOException(Code)
	Reads a single byte from this InputStream and returns the result as an int. The low-order byte is returned or -1 of the end of stream was encountered. This abstract implementation must be provided by concrete subclasses. the byte read or -1 if end of stream. throws: IOException - If the stream is already closed or another IOExceptionoccurs.

read
public int read(byte b) throws IOException(Code)
	Reads bytes from the Stream and stores them in byte array `b`. Answer the number of bytes actually read or -1 if no bytes were read and end of stream was encountered. Parameters: b - the byte array in which to store the read bytes. the number of bytes actually read or -1 if end of stream. throws: IOException - If the stream is already closed or another IOExceptionoccurs.

read
public int read(byte b, int offset, int length) throws IOException(Code)
	Reads at most `length` bytes from the Stream and stores them in byte array `b` starting at `offset`. Answer the number of bytes actually read or -1 if no bytes were read and end of stream was encountered. Parameters: b - the byte array in which to store the read bytes. Parameters: offset - the offset in `b` to store the read bytes. Parameters: length - the maximum number of bytes to store in `b`. the number of bytes actually read or -1 if end of stream. throws: IOException - If the stream is already closed or another IOExceptionoccurs.

reset
public synchronized void reset() throws IOException(Code)
	Reset this InputStream to the last marked location. If the `readlimit` has been passed or no `mark` has been set, throw IOException. This implementation throws IOException and concrete subclasses should provide proper implementations. throws: IOException - If the stream is already closed or another IOExceptionoccurs.

skip
public long skip(long n) throws IOException(Code)
	Skips `n` number of bytes in this InputStream. Subsequent `read()`'s will not return these bytes unless `reset()` is used. This method may perform multiple reads to read `n` bytes. This default implementation reads `n` bytes into a temporary buffer. Concrete subclasses should provide their own implementation. Parameters: n - the number of bytes to skip. the number of bytes actually skipped. throws: IOException - If the stream is already closed or another IOExceptionoccurs.

Methods inherited from java.lang.Object

protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object object)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final public Class<? extends Object> getClass()(Code)(Java Doc)
public int hashCode()(Code)(Java Doc)
final public void notify()(Code)(Java Doc)
final public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final public void wait(long millis, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait(long millis) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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