org.knime.core.data.container
Class DCObjectInputStream

java.lang.Object
  java.io.InputStream
      java.io.ObjectInputStream
          org.knime.core.data.container.DCObjectInputStream

All Implemented Interfaces:

Closeable, DataInput, ObjectInput, ObjectStreamConstants

final class DCObjectInputStream
extends ObjectInputStream

Obsolete input stream to read Files written with Buffer objects in KNIME 1.x (and 2.0TechPreview).

Input stream that is used by the Buffer to read (java.io.-)serialized DataCell (the ones whose type does not support customized reading/writing) and also DataCell objects that have been written using a DataCellSerializer. The class extends ObjectInputStream but delegates incoming readObject() requests to a private ObjectInputStream.

Reading DataCell using a DataCellSerializer is done using the readDataCell() method. It will use another input stream that delegates itself to the private ObjectInputStream but uses blocks to determine the end of a DataCell. An attempt to summarize the different streams is made in the following figure (for the output stream though).

Nested Class Summary

Nested classes/interfaces inherited from class java.io.ObjectInputStream

ObjectInputStream.GetField

Field Summary

Fields inherited from interface java.io.ObjectStreamConstants

baseWireHandle, PROTOCOL_VERSION_1, PROTOCOL_VERSION_2, SC_BLOCK_DATA, SC_ENUM, SC_EXTERNALIZABLE, SC_SERIALIZABLE, SC_WRITE_METHOD, STREAM_MAGIC, STREAM_VERSION, SUBCLASS_IMPLEMENTATION_PERMISSION, SUBSTITUTION_PERMISSION, TC_ARRAY, TC_BASE, TC_BLOCKDATA, TC_BLOCKDATALONG, TC_CLASS, TC_CLASSDESC, TC_ENDBLOCKDATA, TC_ENUM, TC_EXCEPTION, TC_LONGSTRING, TC_MAX, TC_NULL, TC_OBJECT, TC_PROXYCLASSDESC, TC_REFERENCE, TC_RESET, TC_STRING

Constructor Summary

DCObjectInputStream(InputStream in)
Creates new input stream that reads from in.

Method Summary

int	available()
void	close()
void	defaultReadObject()
void	mark(int readlimit)
boolean	markSupported()
int	read()
int	read(byte[] b)
int	read(byte[] buf, int off, int len)
BlobDataCell.BlobAddress	readBlobAddress() Reads a blob address from the stream and ends the block.
boolean	readBoolean()
byte	readByte()
char	readChar()
DataCell	readDataCell(DataCellSerializer<? extends DataCell> serializer) Reads a data cell from the stream and pushes the stream forward to the end of the block.
double	readDouble()
ObjectInputStream.GetField	readFields()
float	readFloat()
void	readFully(byte[] buf)
void	readFully(byte[] buf, int off, int len)
int	readInt()
long	readLong()
protected Object	readObjectOverride()
short	readShort()
Object	readUnshared()
int	readUnsignedByte()
int	readUnsignedShort()
String	readUTF()
void	registerValidation(ObjectInputValidation obj, int prio)
void	reset()
(package private) void	setCurrentClassLoader(ClassLoader l) Set the class loader to ask "first" to load classes.
long	skip(long n)
int	skipBytes(int len)
String	toString()

Methods inherited from class java.io.ObjectInputStream

enableResolveObject, readClassDescriptor, readLine, readObject, readStreamHeader, resolveClass, resolveObject, resolveProxyClass

Methods inherited from class java.lang.Object

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

Constructor Detail

DCObjectInputStream

DCObjectInputStream(InputStream in)
              throws IOException

Creates new input stream that reads from in.

Parameters:

in - The stream to read from.

Throws:

IOException - If the init of the stream reading fails.

Method Detail

readDataCell

public DataCell readDataCell(DataCellSerializer<? extends DataCell> serializer)
                      throws IOException

Reads a data cell from the stream and pushes the stream forward to the end of the block.

Parameters:

serializer - The factory that is used to create the cell

Returns:

A new data cell instance.

Throws:

IOException - If reading fails.

See Also:

DataCellSerializer.deserialize(DataCellDataInput)

readBlobAddress

public BlobDataCell.BlobAddress readBlobAddress()
                                         throws IOException

Reads a blob address from the stream and ends the block.

Returns:

as read from the stream.

Throws:

IOException - If that fails.

available

public int available()
              throws IOException

Specified by:

available in interface ObjectInput

Overrides:

available in class ObjectInputStream

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface ObjectInput

Overrides:

close in class ObjectInputStream

Throws:

IOException

defaultReadObject

public void defaultReadObject()
                       throws IOException,
                              ClassNotFoundException

Overrides:

defaultReadObject in class ObjectInputStream

Throws:

IOException

ClassNotFoundException

mark

public void mark(int readlimit)

Overrides:

mark in class InputStream

markSupported

public boolean markSupported()

Overrides:

markSupported in class InputStream

read

public int read()
         throws IOException

Specified by:

read in interface ObjectInput

Overrides:

read in class ObjectInputStream

Throws:

IOException

read

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

Specified by:

read in interface ObjectInput

Overrides:

read in class ObjectInputStream

Throws:

IOException

read

public int read(byte[] b)
         throws IOException

Specified by:

read in interface ObjectInput

Overrides:

read in class InputStream

Throws:

IOException

readBoolean

public boolean readBoolean()
                    throws IOException

Specified by:

readBoolean in interface DataInput

Overrides:

readBoolean in class ObjectInputStream

Throws:

IOException

readByte

public byte readByte()
              throws IOException

Specified by:

readByte in interface DataInput

Overrides:

readByte in class ObjectInputStream

Throws:

IOException

readChar

public char readChar()
              throws IOException

Specified by:

readChar in interface DataInput

Overrides:

readChar in class ObjectInputStream

Throws:

IOException

readDouble

public double readDouble()
                  throws IOException

Specified by:

readDouble in interface DataInput

Overrides:

readDouble in class ObjectInputStream

Throws:

IOException

readFields

public ObjectInputStream.GetField readFields()
                                      throws IOException,
                                             ClassNotFoundException

Overrides:

readFields in class ObjectInputStream

Throws:

IOException

ClassNotFoundException

readFloat

public float readFloat()
                throws IOException

Specified by:

readFloat in interface DataInput

Overrides:

readFloat in class ObjectInputStream

Throws:

IOException

readFully

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

Specified by:

readFully in interface DataInput

Overrides:

readFully in class ObjectInputStream

Throws:

IOException

readFully

public void readFully(byte[] buf)
               throws IOException

Specified by:

readFully in interface DataInput

Overrides:

readFully in class ObjectInputStream

Throws:

IOException

readInt

public int readInt()
            throws IOException

Specified by:

readInt in interface DataInput

Overrides:

readInt in class ObjectInputStream

Throws:

IOException

readLong

public long readLong()
              throws IOException

Specified by:

readLong in interface DataInput

Overrides:

readLong in class ObjectInputStream

Throws:

IOException

readObjectOverride

protected Object readObjectOverride()
                             throws IOException,
                                    ClassNotFoundException

Overrides:

readObjectOverride in class ObjectInputStream

Throws:

IOException

ClassNotFoundException

readShort

public short readShort()
                throws IOException

Specified by:

readShort in interface DataInput

Overrides:

readShort in class ObjectInputStream

Throws:

IOException

readUnshared

public Object readUnshared()
                    throws IOException,
                           ClassNotFoundException

Overrides:

readUnshared in class ObjectInputStream

Throws:

IOException

ClassNotFoundException

readUnsignedByte

public int readUnsignedByte()
                     throws IOException

Specified by:

readUnsignedByte in interface DataInput

Overrides:

readUnsignedByte in class ObjectInputStream

Throws:

IOException

readUnsignedShort

public int readUnsignedShort()
                      throws IOException

Specified by:

readUnsignedShort in interface DataInput

Overrides:

readUnsignedShort in class ObjectInputStream

Throws:

IOException

readUTF

public String readUTF()
               throws IOException

Specified by:

readUTF in interface DataInput

Overrides:

readUTF in class ObjectInputStream

Throws:

IOException

registerValidation

public void registerValidation(ObjectInputValidation obj,
                               int prio)
                        throws NotActiveException,
                               InvalidObjectException

Overrides:

registerValidation in class ObjectInputStream

Throws:

NotActiveException

InvalidObjectException

reset

public void reset()
           throws IOException

Overrides:

reset in class InputStream

Throws:

IOException

skip

public long skip(long n)
          throws IOException

Specified by:

skip in interface ObjectInput

Overrides:

skip in class InputStream

Throws:

IOException

skipBytes

public int skipBytes(int len)
              throws IOException

Specified by:

skipBytes in interface DataInput

Overrides:

skipBytes in class ObjectInputStream

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object

setCurrentClassLoader

void setCurrentClassLoader(ClassLoader l)

Set the class loader to ask "first" to load classes. Used when a data cell is deserialized and all its member should be loaded in the context of that class loader.

Parameters:

l - The class loader to use, if null it uses the globally known class loader (GlobalClassCreator)