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com.tangosol.io
Class WrapperObjectInputStream

java.lang.Object
java.io.InputStream
com.tangosol.io.WrapperDataInputStream
com.tangosol.io.WrapperObjectInputStream

All Implemented Interfaces:

InputStreaming, Closeable, DataInput, ObjectInput

public class WrapperObjectInputStream

extends WrapperDataInputStream

implements ObjectInput

This is an imitation ObjectInputStream class that provides the ObjectInput interface by delegating to an object that implements the ObjectInput interface. Primarily, this is intended as a base class for building specific-purpose ObjectInput wrappers.

Author:

cp 2004.08.20

Constructor Summary

WrapperObjectInputStream(ObjectInput in)
Construct a WrapperObjectInputStream that will read from the specified object implementing the ObjectInput interface.

Method Summary

int	available() Returns the number of bytes that can be read (or skipped over) from this input stream without causing a blocking I/O condition to occur.
void	close() Close the InputStream and release any system resources associated with it.
ObjectInput	getObjectInput() Obtain the underlying object providing the ObjectInput interface that this object is delegating to.
int	read() Read the next byte of data from the InputStream.
int	read(byte[] ab) Read some number of bytes from the input stream and store them into the passed array ab.
int	read(byte[] ab, int of, int cb) Read up to cb bytes from the input stream and store them into the passed array ab starting at offset of.
Object	readObject() Read and return an object.
long	skip(long cb) Skips over up to the specified number of bytes of data from this InputStream.

Methods inherited from class com.tangosol.io.WrapperDataInputStream

getDataInput, mark, markSupported, readBoolean, readByte, readChar, readDouble, readFloat, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedShort, readUTF, reset, skipBytes

Methods inherited from interface java.io.DataInput

readBoolean, readByte, readChar, readDouble, readFloat, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedShort, readUTF, skipBytes

Constructor Detail

WrapperObjectInputStream

public WrapperObjectInputStream(ObjectInput in)

Construct a WrapperObjectInputStream that will read from the specified object implementing the ObjectInput interface.

Parameters:

in - an object implementing ObjectInput to read from

Method Detail

getObjectInput

public ObjectInput getObjectInput()

Obtain the underlying object providing the ObjectInput interface that this object is delegating to.

Returns:

the underlying ObjectInput

readObject

public Object readObject()
                  throws ClassNotFoundException,
                         IOException

Read and return an object.

Specified by:

readObject in interface ObjectInput

Returns:

the object read from the stream

Throws:

ClassNotFoundException - if the class of a serialized object object cannot be found

IOException - if an I/O error occurs

read

public int read()
         throws IOException

Read the next byte of data from the InputStream. The value byte is returned as an int in the range 0 to 255. If 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.

Specified by:

read in interface InputStreaming

Specified by:

read in interface ObjectInput

Overrides:

read in class WrapperDataInputStream

Returns:

the next byte of data, or -1 if the end of the stream has been reached

Throws:

IOException - if an I/O error occurs

read

public int read(byte[] ab)
         throws IOException

Read some number of bytes from the input stream and store them into the passed array ab. The number of bytes actually read is returned.

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

Specified by:

read in interface InputStreaming

Specified by:

read in interface ObjectInput

Overrides:

read in class WrapperDataInputStream

Parameters:

ab - the array to store the bytes which are read from the stream

Returns:

the number of bytes read from the stream, or -1 if no bytes were read from the stream because the end of the stream had been reached

Throws:

NullPointerException - if the passed array is null

IOException - if an I/O error occurs

read

public int read(byte[] ab,
                int of,
                int cb)
         throws IOException

Read up to cb bytes from the input stream and store them into the passed array ab starting at offset of. The number of bytes actually read is returned.

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

Specified by:

read in interface InputStreaming

Specified by:

read in interface ObjectInput

Overrides:

read in class WrapperDataInputStream

Parameters:

ab - the array to store the bytes which are read from the stream

of - the offset into the array that the read bytes will be stored

cb - the maximum number of bytes to read

Returns:

the number of bytes read from the stream, or -1 if no bytes were read from the stream because the end of the stream had been reached

Throws:

NullPointerException - if the passed array is null

IndexOutOfBoundsException - if of or cb is negative, or of+cb is greater than the length of the ab

IOException - if an I/O error occurs

skip

public long skip(long cb)
          throws IOException

Skips over up to the specified number of bytes of data from this InputStream. The number of bytes actually skipped over may be fewer than the number specified to skip, and may even be zero; this can be caused by an end-of-file condition, but can also occur even when there is data remaining in the InputStream. As a result, the caller should check the return value from this method, which indicates the actual number of bytes skipped.

Specified by:

skip in interface InputStreaming

Specified by:

skip in interface ObjectInput

Overrides:

skip in class WrapperDataInputStream

Parameters:

cb - the maximum number of bytes to skip over

Returns:

the actual number of bytes that were skipped over

Throws:

IOException - if an I/O error occurs

available

public int available()
              throws IOException

Returns the number of bytes that can be read (or skipped over) from this input stream without causing a blocking I/O condition to occur. This method reflects the assumed implementation of various buffering InputStreams, which can guarantee non-blocking reads up to the extent of their buffers, but beyond that the read operations will have to read from some underlying (and potentially blocking) source.

Specified by:

available in interface InputStreaming

Specified by:

available in interface ObjectInput

Overrides:

available in class WrapperDataInputStream

Returns:

the number of bytes that can be read from this InputStream without blocking

Throws:

IOException - if an I/O error occurs

close

public void close()
           throws IOException

Close the InputStream and release any system resources associated with it.

Specified by:

close in interface InputStreaming

Specified by:

close in interface Closeable

Specified by:

close in interface ObjectInput

Overrides:

close in class WrapperDataInputStream

Throws:

IOException - if an I/O error occurs

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