org.apache.velocity.util.introspection
Class LinkingUberspector

java.lang.Object
  org.apache.velocity.util.introspection.UberspectImpl
      org.apache.velocity.util.introspection.AbstractChainableUberspector
          org.apache.velocity.util.introspection.LinkingUberspector

All Implemented Interfaces:

ChainableUberspector, Uberspect, UberspectLoggable

public class LinkingUberspector
extends AbstractChainableUberspector

When the runtime.introspection.uberspect configuration property contains several uberspector class names, it means those uberspectors will be chained. When an uberspector in the list other than the leftmost does not implement ChainableUberspector, then this utility class is used to provide a basic default chaining where the first non-null result is kept for each introspection call.

Since:

1.6

Version:

$Id: LinkingUberspector.java 10959 2008-07-01 00:12:29Z sdumitriu $

See Also:

ChainableUberspector

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.velocity.util.introspection.UberspectImpl

UberspectImpl.VelGetterImpl, UberspectImpl.VelMethodImpl, UberspectImpl.VelSetterImpl

Field Summary

Fields inherited from class org.apache.velocity.util.introspection.AbstractChainableUberspector

inner

Fields inherited from class org.apache.velocity.util.introspection.UberspectImpl

introspector, log

Constructor Summary

LinkingUberspector(Uberspect left, Uberspect right)
Constructor that takes the two uberspectors to link

Method Summary

Iterator	getIterator(Object obj, Info i) To support iterative objects used in a #foreach() loop.
VelMethod	getMethod(Object obj, String methodName, Object[] args, Info i) Method
VelPropertyGet	getPropertyGet(Object obj, String identifier, Info i) Property getter
VelPropertySet	getPropertySet(Object obj, String identifier, Object arg, Info i) Property setter
void	init() init - the chainable uberspector is responsible for the initialization of the wrapped uberspector

Methods inherited from class org.apache.velocity.util.introspection.AbstractChainableUberspector

wrap

Methods inherited from class org.apache.velocity.util.introspection.UberspectImpl

setLog, setRuntimeLogger

Methods inherited from class java.lang.Object

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

Constructor Detail

LinkingUberspector

public LinkingUberspector(Uberspect left,
                          Uberspect right)

Constructor that takes the two uberspectors to link

Method Detail

init

public void init()
          throws Exception

init - the chainable uberspector is responsible for the initialization of the wrapped uberspector

Init both wrapped uberspectors

Specified by:

init in interface Uberspect

Overrides:

init in class AbstractChainableUberspector

Throws:

Exception

See Also:

Uberspect.init()

getIterator

public Iterator getIterator(Object obj,
                            Info i)
                     throws Exception

To support iterative objects used in a #foreach() loop.

Specified by:

getIterator in interface Uberspect

Overrides:

getIterator in class AbstractChainableUberspector

Parameters:

obj - The iterative object.

i - Info about the object's location.

Returns:

An Iterator object.

Throws:

Exception

See Also:

Uberspect.getIterator(java.lang.Object, org.apache.velocity.util.introspection.Info)

getMethod

public VelMethod getMethod(Object obj,
                           String methodName,
                           Object[] args,
                           Info i)
                    throws Exception

Method

Specified by:

getMethod in interface Uberspect

Overrides:

getMethod in class AbstractChainableUberspector

Returns:

A Velocity Method.

Throws:

Exception

See Also:

Uberspect.getMethod(java.lang.Object, java.lang.String, java.lang.Object[], org.apache.velocity.util.introspection.Info)

getPropertyGet

public VelPropertyGet getPropertyGet(Object obj,
                                     String identifier,
                                     Info i)
                              throws Exception

Property getter

Specified by:

getPropertyGet in interface Uberspect

Overrides:

getPropertyGet in class AbstractChainableUberspector

Returns:

A Velocity Getter Method.

Throws:

Exception

See Also:

Uberspect.getPropertyGet(java.lang.Object, java.lang.String, org.apache.velocity.util.introspection.Info)

getPropertySet

public VelPropertySet getPropertySet(Object obj,
                                     String identifier,
                                     Object arg,
                                     Info i)
                              throws Exception

Property setter

Specified by:

getPropertySet in interface Uberspect

Overrides:

getPropertySet in class AbstractChainableUberspector

Returns:

A Velocity Setter method.

Throws:

Exception

See Also:

Uberspect.getPropertySet(java.lang.Object, java.lang.String, java.lang.Object, org.apache.velocity.util.introspection.Info)