org.apache.commons.jexl2.internal
Class AbstractExecutor.Get

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

All Implemented Interfaces:

JexlPropertyGet

Direct Known Subclasses:

BooleanGetExecutor, DuckGetExecutor, ListGetExecutor, MapGetExecutor, PropertyGetExecutor

Enclosing class:

AbstractExecutor

public abstract static class AbstractExecutor.Get
extends AbstractExecutor
implements JexlPropertyGet

Abstract class that is used to execute an arbitrary 'get' method.

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

protected

AbstractExecutor.Get(Class<?> theClass, Method theMethod) Default and sole constructor.

Method Summary

abstract Object	execute(Object obj) Gets the property value from an object.
Object	invoke(Object obj) Method used to get the property value of an object.
Object	tryExecute(Object obj, Object key) Tries to reuse this executor, checking that it is compatible with the actual set of arguments.
Object	tryInvoke(Object obj, Object key) Attempts to reuse this JexlPropertyGet, checking that it is compatible with the actual set of arguments.

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

equals, equals, getMethod, getMethodName, getTargetClass, getTargetProperty, 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

AbstractExecutor.Get

protected AbstractExecutor.Get(Class<?> theClass,
                               Method theMethod)

Default and sole constructor.

Parameters:

theClass - the class this executor applies to

theMethod - the method held by this executor

Method Detail

invoke

public final Object invoke(Object obj)
                    throws 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:

Exception - on any error.

tryInvoke

public final Object tryInvoke(Object obj,
                              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.

execute

public abstract Object execute(Object obj)
                        throws IllegalAccessException,
                               InvocationTargetException

Gets the property value from an object.

Parameters:

obj - The object to get the property from.

Returns:

The property value.

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).

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.