Package org.apache.commons.jexl3.internal.introspection

Class PropertyGetExecutor

java.lang.Object

org.apache.commons.jexl3.internal.introspection.AbstractExecutor

org.apache.commons.jexl3.internal.introspection.AbstractExecutor.Get

org.apache.commons.jexl3.internal.introspection.PropertyGetExecutor

All Implemented Interfaces:

JexlPropertyGet

public final class PropertyGetExecutor
extends AbstractExecutor.Get

Specialized executor to get a property from an object.

Since:

2.0

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.commons.jexl3.internal.introspection.AbstractExecutor

AbstractExecutor.Get, AbstractExecutor.Method, AbstractExecutor.Set

Field Summary

Fields

Modifier and Type	Field	Description
private static final Object[]	EMPTY_PARAMS	A static signature for method().
private final String	property	The property.

Fields inherited from class org.apache.commons.jexl3.internal.introspection.AbstractExecutor

method, objectClass, TRY_FAILED

Constructor Summary

Constructors

Modifier	Constructor	Description
private	PropertyGetExecutor(Class<?> clazz, Method method, String identifier)	Creates an instance.

Method Summary

Modifier and Type	Method	Description
static PropertyGetExecutor	discover(Introspector is, Class<?> clazz, String property)	Discovers a PropertyGetExecutor.
(package private) static Method	discoverGet(Introspector is, String which, Class<?> clazz, String property)	Base method for boolean and object property get.
Object	getTargetProperty()	Gets the property targeted by this executor.
Object	invoke(Object o)	Method used to get the property value of an object.
Object	tryInvoke(Object o, Object identifier)	Attempts to reuse this JexlPropertyGet, checking that it is compatible with the actual set of arguments.

Methods inherited from class org.apache.commons.jexl3.internal.introspection.AbstractExecutor

castInteger, castString, classOf, equals, equals, getMethod, getMethodName, getTargetClass, hashCode, initMarker, isAlive, isCacheable, makeArgs, tryFailed

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.commons.jexl3.introspection.JexlPropertyGet

isCacheable, tryFailed

Field Details

EMPTY_PARAMS

private static final Object[] EMPTY_PARAMS

A static signature for method().

property

private final String property

The property.

Constructor Details

PropertyGetExecutor

private PropertyGetExecutor(Class<?> clazz,
 Method method,
 String identifier)

Creates an instance.

Parameters:

clazz - he class the get method applies to

method - the method held by this executor

identifier - the property to get

Method Details

discover

public static PropertyGetExecutor discover(Introspector is,
 Class<?> clazz,
 String property)

Discovers a PropertyGetExecutor.

The method to be found should be named "get{P,p}property.

Parameters:

is - the introspector

clazz - the class to find the get method from

property - the property name to find

Returns:

the executor if found, null otherwise

discoverGet

static Method discoverGet(Introspector is,
 String which,
 Class<?> clazz,
 String property)

Base method for boolean and object property get.

Parameters:

is - the introspector

which - "is" or "get" for boolean or object

clazz - The class being examined.

property - The property being addressed.

Returns:

The {get,is}{p,P}roperty method if one exists, null otherwise.

getTargetProperty

public Object getTargetProperty()

Description copied from class: AbstractExecutor

Gets the property targeted by this executor.

Overrides:

getTargetProperty in class AbstractExecutor

Returns:

the target property

invoke

public Object invoke(Object o)
              throws IllegalAccessException,
InvocationTargetException

Description copied from interface: JexlPropertyGet

Method used to get the property value of an object.

Parameters:

o - the object to get the property value from.

Returns:

the property value.

Throws:

IllegalAccessException

InvocationTargetException

tryInvoke

public Object tryInvoke(Object o,
 Object identifier)

Description copied from interface: JexlPropertyGet

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

Parameters:

o - the object to invoke the property get upon

identifier - 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.