org.apache.commons.jexl2.internal
Class DuckGetExecutor

java.lang.Object
  org.apache.commons.jexl2.internal.AbstractExecutor
      org.apache.commons.jexl2.internal.AbstractExecutor.Get
          org.apache.commons.jexl2.internal.DuckGetExecutor

All Implemented Interfaces:

JexlPropertyGet

public final class DuckGetExecutor
extends AbstractExecutor.Get

Specialized executor to get a property from an object.

Duck as in duck-typing for an interface like: interface Get { Object get(Object key); }

Since:

2.0

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.commons.jexl2.internal.AbstractExecutor

AbstractExecutor.Get, AbstractExecutor.Method, AbstractExecutor.Set

Field Summary

Fields inherited from class org.apache.commons.jexl2.internal.AbstractExecutor

method, objectClass, TRY_FAILED

Constructor Summary

DuckGetExecutor(Introspector is, Class<?> clazz, Object identifier)
Creates an instance by attempting discovery of the get method.

Method Summary

Object	execute(Object obj) Get the property from the object.
Object	getTargetProperty() Gets the property targeted by this executor.
Object	tryExecute(Object obj, Object key) Tries to reuse this executor, checking that it is compatible with the actual set of arguments.

Methods inherited from class org.apache.commons.jexl2.internal.AbstractExecutor.Get

invoke, tryInvoke

Methods inherited from class org.apache.commons.jexl2.internal.AbstractExecutor

equals, equals, getMethod, getMethodName, getTargetClass, hashCode, isAlive, isCacheable, tryFailed

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.commons.jexl2.introspection.JexlPropertyGet

isCacheable, tryFailed

Constructor Detail

DuckGetExecutor

public DuckGetExecutor(Introspector is,
                       Class<?> clazz,
                       Object identifier)

Creates an instance by attempting discovery of the get method.

Parameters:

is - the introspector

clazz - the class to introspect

identifier - the property to get

Method Detail

getTargetProperty

public Object getTargetProperty()

Gets the property targeted by this executor.

Overrides:

getTargetProperty in class AbstractExecutor

Returns:

the target property

execute

public Object execute(Object obj)
               throws IllegalAccessException,
                      InvocationTargetException

Get the property from the object.

Specified by:

execute in class AbstractExecutor.Get

Parameters:

obj - the object.

Returns:

object.get(property)

Throws:

IllegalAccessException - Method is inaccessible.

InvocationTargetException - Method body throws an exception.

tryExecute

public Object tryExecute(Object obj,
                         Object key)

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

Compatibility means that: o must be of the same class as this executor's target class and property must be of the same class as this executor's target property (for list and map based executors) and have the same value (for other types).

Overrides:

tryExecute in class AbstractExecutor.Get

Parameters:

obj - The object to get the property from.

key - The property to get from the object.

Returns:

The property value or TRY_FAILED if checking failed.