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## org.apache.commons.jexl2.introspection
Interface JexlPropertyGet

All Known Implementing Classes:
  AbstractExecutor.Get, BooleanGetExecutor, DuckGetExecutor, ListGetExecutor, MapGetExecutor, PropertyGetExecutor, UberspectImpl.FieldPropertyGet

    public interface JexlPropertyGet

Interface for getting values that appear to be properties. Ex. `${foo.bar}`

Since:
  1.0
Version:
  $Id: JexlPropertyGet.java 889760 2009-12-11 18:42:49Z sebb $
Author:
  Geir Magnusson Jr.

Method Summary
`Object` | `invoke(Object obj)` Method used to get the property value of an object.
`boolean` | `isCacheable()` Specifies if this JexlPropertyGet 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)` Attempts to reuse this JexlPropertyGet, checking that it is compatible with the actual set of arguments.

Method Detail

### invoke

    Object invoke(Object obj)
                  throws Exception

  Method used to get the property value of an object.

  Parameters:
    `obj` - the object to get the property value from.
  Returns:
    the property value.
  Throws:
    `Exception` - on any error.

### tryInvoke

    Object tryInvoke(Object obj,
                     Object key)

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

  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

    boolean tryFailed(Object rval)

  Checks whether a tryInvoke failed or not.

  Parameters:
    `rval` - the value returned by tryInvoke
  Returns:
    true if tryInvoke failed, false otherwise

### isCacheable

    boolean isCacheable()

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

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

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