org.apache.commons.jexl2.internal

Class MapGetExecutor

java.lang.Object

org.apache.commons.jexl2.internal.AbstractExecutor

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

org.apache.commons.jexl2.internal.MapGetExecutor

All Implemented Interfaces:

JexlPropertyGet

public final class MapGetExecutor
extends AbstractExecutor.Get

Specialized executor to get a property from a Map.

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

Modifier and Type	Field and Description
private static java.lang.reflect.Method	MAP_GET The java.util.map.get method used as an active marker in MapGet.
private java.lang.Object	property The property.

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

method, objectClass, TRY_FAILED

Constructor Summary

Constructors

Constructor and Description
MapGetExecutor(Introspector is, java.lang.Class<?> clazz, java.lang.Object key) Creates an instance checking for the Map interface.

Method Summary

Modifier and Type	Method and Description
(package private) static java.lang.reflect.Method	discover(java.lang.Class<?> clazz) Finds the method to perform 'get' on a map.
java.lang.Object	execute(java.lang.Object obj) Get the property from the map.
java.lang.Object	getTargetProperty() Gets the property targeted by this executor.
java.lang.Object	tryExecute(java.lang.Object obj, java.lang.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, 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.jexl2.introspection.JexlPropertyGet

isCacheable, tryFailed

Field Detail

MAP_GET

private static final java.lang.reflect.Method MAP_GET

The java.util.map.get method used as an active marker in MapGet.

property

private final java.lang.Object property

The property.

Constructor Detail

MapGetExecutor

public MapGetExecutor(Introspector is,
                      java.lang.Class<?> clazz,
                      java.lang.Object key)

Creates an instance checking for the Map interface.

Parameters:

is - the introspector

clazz - the class that might implement the map interface

key - the key to use in map.get(key)

Method Detail

getTargetProperty

public java.lang.Object getTargetProperty()

Gets the property targeted by this executor.

Overrides:

getTargetProperty in class AbstractExecutor

Returns:

the target property

execute

public java.lang.Object execute(java.lang.Object obj)

Get the property from the map.

Specified by:

execute in class AbstractExecutor.Get

Parameters:

obj - the map.

Returns:

map.get(property)

tryExecute

public java.lang.Object tryExecute(java.lang.Object obj,
                                   java.lang.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.

discover

static java.lang.reflect.Method discover(java.lang.Class<?> clazz)

Finds the method to perform 'get' on a map.

Parameters:

clazz - the class to introspect

Returns:

a marker method, map.get