Class DuckGetExecutor

  • All Implemented Interfaces:
    JexlPropertyGet

    public final class DuckGetExecutor
    extends AbstractExecutor.Get
    Specialized executor to get a property from an object.

    Duck as in duck-typing for an interface like: interface Get { Object get(Object key); }

    Since:
    2.0
    • Field Detail

      • property

        private final java.lang.Object property
        The property, may be null.
    • Constructor Detail

      • DuckGetExecutor

        private DuckGetExecutor​(java.lang.Class<?> clazz,
                                java.lang.reflect.Method method,
                                java.lang.Object identifier)
        Creates an instance.
        Parameters:
        clazz - he class the get method applies to
        method - the method held by this executor
        identifier - the property to get
    • Method Detail

      • discover

        public static DuckGetExecutor discover​(Introspector is,
                                               java.lang.Class<?> clazz,
                                               java.lang.Object identifier)
        Attempts to discover a DuckGetExecutor.
        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
        Returns:
        the executor if found, null otherwise
      • getTargetProperty

        public java.lang.Object getTargetProperty()
        Description copied from class: AbstractExecutor
        Gets the property targeted by this executor.
        Overrides:
        getTargetProperty in class AbstractExecutor
        Returns:
        the target property
      • invoke

        public java.lang.Object invoke​(java.lang.Object obj)
                                throws java.lang.IllegalAccessException,
                                       java.lang.reflect.InvocationTargetException
        Description copied from interface: JexlPropertyGet
        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:
        java.lang.IllegalAccessException
        java.lang.reflect.InvocationTargetException
      • tryInvoke

        public java.lang.Object tryInvoke​(java.lang.Object obj,
                                          java.lang.Object key)
        Description copied from interface: JexlPropertyGet
        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.