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com.jcorporate.expresso.core.dataobjects
Class DataTransferObject  

java.lang.Object
  com.jcorporate.expresso.core.dataobjects.DataTransferObject

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable

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public final class DataTransferObject

extends java.lang.Object

implements java.io.Externalizable

Basic HashMap wrapper for the Data Transfer Object pattern. The goal of this class is to provide efficient serialization over the wire of DBOBjects and or the up and coming DataObjects. By encapsulating the 'data guts' of the data objects into this class, routing programs that don't have to know anything about a particular instance of a DBObject/DataObject don't have to have any large code base installed on them.

The other advantage of DataTransferObject is serialization size. On tests conducted 3/17/04, the size of com.jcorporate.expresso.services.dbobj.MimeTypes was 1310 bytes. The size of the same item converted into a DataTransfer object was 293 bytes. For in-memory serialization alone, this translates to twice as fast. For slower connections such as sockets, this speed translation will be more pronounced.

Since:

Expresso 5.0

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Field Summary
private  java.lang.String	dataContext
private static java.lang.String	EMPTY_STRING
private  java.lang.String	objectClassName
private  java.util.HashMap	tableFields

 

Constructor Summary

DataTransferObject()

 

Method Summary
java.lang.String	getDataContext()
java.lang.String	getObjectClassName()
java.util.Map	getTableFields()           Gets the table fields in bulk
void	readExternal(java.io.ObjectInput ois)           Optimized Deserialization
void	setDataContext(java.lang.String dataContext)
void	setObjectClassName(java.lang.String objectClassName)           Sets the classname of the DataObject we're attached to so that we can instantiate it at the far end of the wire.
void	setTableFields(java.util.Map tableFields)           Sets the data fields in bulk.
void	writeExternal(java.io.ObjectOutput oos)           Optimized Serialization implementation that does not utilize any reflection

 

Methods inherited from class java.lang.Object

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

 

Field Detail

EMPTY_STRING

private static final transient java.lang.String EMPTY_STRING

See Also:

Constant Field Values

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tableFields

private java.util.HashMap tableFields

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dataContext

private java.lang.String dataContext

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objectClassName

private java.lang.String objectClassName

Constructor Detail

DataTransferObject

public DataTransferObject()

Method Detail

readExternal

public void readExternal(java.io.ObjectInput ois)
                  throws java.lang.ClassNotFoundException,
                         java.io.IOException

Optimized Deserialization

Specified by:

readExternal in interface java.io.Externalizable

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writeExternal

public void writeExternal(java.io.ObjectOutput oos)
                   throws java.io.IOException

Optimized Serialization implementation that does not utilize any reflection

Specified by:

writeExternal in interface java.io.Externalizable

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setTableFields

public void setTableFields(java.util.Map tableFields)

Sets the data fields in bulk. Does not perform a data copy unless the passed in type is not a HashMap

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getTableFields

public java.util.Map getTableFields()

Gets the table fields in bulk

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setDataContext

public void setDataContext(java.lang.String dataContext)

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getDataContext

public java.lang.String getDataContext()

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setObjectClassName

public void setObjectClassName(java.lang.String objectClassName)

Sets the classname of the DataObject we're attached to so that we can instantiate it at the far end of the wire.

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getObjectClassName

public java.lang.String getObjectClassName()

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> com >> jcorporate >> expresso >> core >> [ dataobjects overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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