org.apache.commons.jexl3.internal.introspection
Class IndexedType

java.lang.Object
  org.apache.commons.jexl3.internal.introspection.IndexedType

All Implemented Interfaces:

JexlPropertyGet

public final class IndexedType
extends Object
implements JexlPropertyGet

Abstract an indexed property container.

This allows getting properties from expressions like var.container.property. This stores the container name and 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).

discover

public static JexlPropertyGet discover(Introspector is,
                                       Object object,
                                       String name)

Attempts to find an indexed-property getter in an object. The code attempts to find the list of methods getXXX() and setXXX(). Note that this is not equivalent to the strict bean definition of indexed properties; the type of the key is not necessarily an int and the set/get arrays are not resolved.

Parameters:

is - the introspector

object - the object

name - the container name

Returns:

a JexlPropertyGet is successful, null otherwise

invoke

public Object invoke(Object obj)
              throws Exception

Description copied from interface: JexlPropertyGet

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 Object tryInvoke(Object obj,
                        Object key)

Description copied from interface: JexlPropertyGet

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(Object rval)

Description copied from interface: JexlPropertyGet

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()

Description copied from interface: JexlPropertyGet

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