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## 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.

Method Summary
`static JexlPropertySet` | `discover(Introspector is, Class<?> clazz, String identifier, Object value)` Attempts to discover a FieldSetExecutor.
`Object` | `invoke(Object obj, Object arg)` Method used to set the property value of an object.
`boolean` | `isCacheable()` Specifies if this JexlPropertySet is cacheable and able to be reused for this class of object it was returned for.
`boolean` | `tryFailed(Object rval)` Checks whether a tryInvoke failed or not.
`Object` | `tryInvoke(Object obj, Object key, Object value)` Attempts to reuse this JexlPropertySet, checking that it is compatible with the actual set of arguments.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

### 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

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