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nextapp.echoservlet.util
Class PeerFactory  

java.lang.Object
  nextapp.echoservlet.util.PeerFactory

All Implemented Interfaces:

java.io.Serializable

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public class PeerFactory

extends java.lang.Object

implements java.io.Serializable

Generates "peer" objects for objects based on associations. Associations are stored in a properties files, where the keys are the fully qualified class names of objects and the values are the fully qualified class names of their peers. When an object is passed to the createPeer() method its peer will be returned based on the bindings in the properties file. An objects superclass(es) will also be tested for available peers if none is available for the derived class. If no peer is found, a PeerFactoryException is thrown.

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Nested Class Summary
class	PeerFactory.PeerFactoryException           An exception used to describe a problem that was encountered loading a peer object.

 

Field Summary
private  java.util.Map	associations           A map of associations

 

Constructor Summary

PeerFactory()           Creates a new PeerFactory.

PeerFactory(java.lang.String propertiesFile)           Creates a new PeerFactory with initial associations.

 

Method Summary
void	addAssociation(java.lang.String className, java.lang.String peerClassName)           Adds a single peer binding.
void	addAssociations(java.lang.String propertiesFile)           Loads peer bindings.
java.lang.Object	createPeer(java.lang.Object object)           Instantiates a new peer for the specified object by invoking its default constructor.
java.lang.Class	getPeerClass(java.lang.Class objectClass)           Returns the peer class associated for the given object class.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

associations

private java.util.Map associations

A map of associations

Constructor Detail

PeerFactory

public PeerFactory()

Creates a new PeerFactory.

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PeerFactory

public PeerFactory(java.lang.String propertiesFile)
            throws PeerFactory.PeerFactoryException

Creates a new PeerFactory with initial associations.

Method Detail

addAssociation

public void addAssociation(java.lang.String className,
                           java.lang.String peerClassName)

Adds a single peer binding.

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addAssociations

public void addAssociations(java.lang.String propertiesFile)
                     throws PeerFactory.PeerFactoryException

Loads peer bindings. Invoking this method will result in the new associations supplementing existing associations. Existing associations will not be removed. If two associations have the same key, the most recently added one will be used.

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createPeer

public java.lang.Object createPeer(java.lang.Object object)
                            throws PeerFactory.PeerFactoryException

Instantiates a new peer for the specified object by invoking its default constructor.

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getPeerClass

public java.lang.Class getPeerClass(java.lang.Class objectClass)
                             throws PeerFactory.PeerFactoryException

Returns the peer class associated for the given object class.

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