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

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

All Implemented Interfaces:

JexlPropertySet

public final class FieldSetExecutor
extends Object
implements JexlPropertySet

A JexlPropertySet for public fields.

discover

public static JexlPropertySet discover(Introspector is,
                                       Class<?> clazz,
                                       String identifier,
                                       Object value)

Attempts to discover a FieldSetExecutor.

Parameters:

is - the introspector

clazz - the class to find the get method from

identifier - the key to use as an argument to the get method

value - the value to set the field to

Returns:

the executor if found, null otherwise

invoke

public Object invoke(Object obj,
                     Object arg)
              throws Exception

Description copied from interface: JexlPropertySet

Method used to set the property value of an object.

Specified by:

invoke in interface JexlPropertySet

Parameters:

obj - Object on which the property setter will be called with the value

arg - value to be set

Returns:

the value returned from the set operation (impl specific)

Throws:

Exception - on any error.

tryInvoke

public Object tryInvoke(Object obj,
                        Object key,
                        Object value)

Description copied from interface: JexlPropertySet

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

Specified by:

tryInvoke in interface JexlPropertySet

Parameters:

obj - the object to invoke the the get upon

key - the property key to get

value - the property value to set

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: JexlPropertySet

Checks whether a tryInvoke failed or not.

Specified by:

tryFailed in interface JexlPropertySet

Parameters:

rval - the value returned by tryInvoke

Returns:

true if tryInvoke failed, false otherwise

isCacheable

public boolean isCacheable()

Description copied from interface: JexlPropertySet

Specifies if this JexlPropertySet is cacheable and able to be reused for this class of object it was returned for.

Specified by:

isCacheable in interface JexlPropertySet

Returns:

true if can be reused for this class, false if not