org.apache.commons.jexl2.introspection

Class UberspectImpl.IndexedType

java.lang.Object

org.apache.commons.jexl2.introspection.UberspectImpl.IndexedType

All Implemented Interfaces:

JexlPropertyGet

Enclosing class:

UberspectImpl

private static final class UberspectImpl.IndexedType
extends java.lang.Object
implements JexlPropertyGet

Abstract an indexed property container. This stores the container name and owning class as well as the list of available getter and setter methods. It implements JexlPropertyGet since such a container can only be accessed from its owning instance (not set).

Since:

2.1

Field Summary

Fields

Modifier and Type	Field and Description
private java.lang.Class<?>	clazz The owning class.
private java.lang.String	container The container name.
private java.lang.reflect.Method[]	getters The array of getter methods.
private java.lang.reflect.Method[]	setters The array of setter methods.

Constructor Summary

Constructors

Constructor and Description
IndexedType(java.lang.String name, java.lang.Class<?> c, java.lang.reflect.Method[] gets, java.lang.reflect.Method[] sets) Creates a new indexed type.

Method Summary

Modifier and Type	Method and Description
java.lang.Object	invoke(java.lang.Object obj) Method used to get the property value of an object.
private java.lang.Object	invokeGet(java.lang.Object object, java.lang.Object key) Gets the value of a property from a container.
private java.lang.Object	invokeSet(java.lang.Object object, java.lang.Object key, java.lang.Object value) Sets the value of a property in a container.
boolean	isCacheable() Specifies if this JexlPropertyGet is cacheable and able to be reused for this class of object it was returned for.
boolean	tryFailed(java.lang.Object rval) Checks whether a tryInvoke failed or not.
java.lang.Object	tryInvoke(java.lang.Object obj, java.lang.Object key) Attempts to reuse this JexlPropertyGet, checking that it is compatible with the actual set of arguments.

Methods inherited from class java.lang.Object

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

Field Detail

container

private final java.lang.String container

The container name.

clazz

private final java.lang.Class<?> clazz

The owning class.

getters

private final java.lang.reflect.Method[] getters

The array of getter methods.

setters

private final java.lang.reflect.Method[] setters

The array of setter methods.

Constructor Detail

IndexedType

IndexedType(java.lang.String name,
            java.lang.Class<?> c,
            java.lang.reflect.Method[] gets,
            java.lang.reflect.Method[] sets)

Creates a new indexed type.

Parameters:

name - the container name

c - the owning class

gets - the array of getter methods

sets - the array of setter methods

Method Detail

invoke

public java.lang.Object invoke(java.lang.Object obj)
                        throws java.lang.Exception

Method used to get the property value of an object.

Specified by:

invoke in interface JexlPropertyGet

Parameters:

obj - the object to get the property value from.

Returns:

the property value.

Throws:

java.lang.Exception - on any error.

tryInvoke

public java.lang.Object tryInvoke(java.lang.Object obj,
                                  java.lang.Object key)

Attempts to reuse this JexlPropertyGet, checking that it is compatible with the actual set of arguments.

Specified by:

tryInvoke in interface JexlPropertyGet

Parameters:

obj - the object to invoke the property get upon

key - the property key to get

Returns:

the result of the method invocation that should be checked by tryFailed to determine if it succeeded or failed.

tryFailed

public boolean tryFailed(java.lang.Object rval)

Checks whether a tryInvoke failed or not.

Specified by:

tryFailed in interface JexlPropertyGet

Parameters:

rval - the value returned by tryInvoke

Returns:

true if tryInvoke failed, false otherwise

isCacheable

public boolean isCacheable()

Specifies if this JexlPropertyGet is cacheable and able to be reused for this class of object it was returned for.

Specified by:

isCacheable in interface JexlPropertyGet

Returns:

true if can be reused for this class, false if not

invokeGet

private java.lang.Object invokeGet(java.lang.Object object,
                                   java.lang.Object key)
                            throws java.lang.Exception

Gets the value of a property from a container.

Parameters:

object - the instance owning the container (not null)

key - the property key (not null)

Returns:

the property value

Throws:

java.lang.Exception - if invocation failed; IntrospectionException if a property getter could not be found

invokeSet

private java.lang.Object invokeSet(java.lang.Object object,
                                   java.lang.Object key,
                                   java.lang.Object value)
                            throws java.lang.Exception

Sets the value of a property in a container.

Parameters:

object - the instance owning the container (not null)

key - the property key (not null)

value - the property value (not null)

Returns:

the result of the method invocation (frequently null)

Throws:

java.lang.Exception - if invocation failed; IntrospectionException if a property setter could not be found