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com.vaadin.event.

Class ListenerMethod

  • All Implemented Interfaces:

    Serializable, EventListener

    public class ListenerMethod
extends Object
implements EventListener, Serializable

    One registered event listener. This class contains the listener object reference, listened event type, the trigger method to call when the event fires, and the optional argument list to pass to the method and the index of the argument to replace with the event object.

    This Class provides several constructors that allow omission of the optional arguments, and giving the listener method directly, or having the constructor to reflect it using merely the name of the method.

    It should be pointed out that the method receiveEvent(EventObject event) is the one that filters out the events that do not match with the given event type and thus do not result in calling of the trigger method.

    Since:

    3.0

    Author:

    Vaadin Ltd.

    See Also:

    Serialized Form

    • Constructor Detail

      • ListenerMethod

        @Deprecated
public ListenerMethod​(Class<?> eventType,
                      Object target,
                      Method method,
                      Object[] arguments,
                      int eventArgumentIndex)
               throws IllegalArgumentException
        Deprecated.

        Constructs a new event listener from a trigger method, it's arguments and the argument index specifying which one is replaced with the event object when the trigger method is called.

        This constructor gets the trigger method as a parameter so it does not need to reflect to find it out.

        Parameters:

        eventType - the event type that is listener listens to. All events of this kind (or its subclasses) result in calling the trigger method.

        target - the object instance that contains the trigger method

        method - the trigger method

        arguments - the arguments to be passed to the trigger method

        eventArgumentIndex - An index to the argument list. This index points out the argument that is replaced with the event object before the argument set is passed to the trigger method. If the eventArgumentIndex is negative, the triggering event object will not be passed to the trigger method, though it is still called.

        Throws:

        IllegalArgumentException - if method is not a member of target.

      • ListenerMethod

        public ListenerMethod​(Class<?> eventType,
                      SerializableEventListener listener,
                      Method method,
                      Object[] arguments,
                      int eventArgumentIndex)
               throws IllegalArgumentException

        Constructs a new event listener from a trigger method, it's arguments and the argument index specifying which one is replaced with the event object when the trigger method is called.

        This constructor gets the trigger method as a parameter so it does not need to reflect to find it out.

        Parameters:

        eventType - the event type that is listener listens to. All events of this kind (or its subclasses) result in calling the trigger method.

        listener - the listener instance that contains the trigger method

        method - the trigger method

        arguments - the arguments to be passed to the trigger method

        eventArgumentIndex - An index to the argument list. This index points out the argument that is replaced with the event object before the argument set is passed to the trigger method. If the eventArgumentIndex is negative, the triggering event object will not be passed to the trigger method, though it is still called.

        Throws:

        IllegalArgumentException - if method is not a member of target.

      • ListenerMethod

        @Deprecated
public ListenerMethod​(Class<?> eventType,
                      Object target,
                      String methodName,
                      Object[] arguments,
                      int eventArgumentIndex)
               throws IllegalArgumentException
        Deprecated.

        Constructs a new event listener from a trigger method name, it's arguments and the argument index specifying which one is replaced with the event object. The actual trigger method is reflected from object, and java.lang.IllegalArgumentException is thrown unless exactly one match is found.

        Parameters:

        eventType - the event type that is listener listens to. All events of this kind (or its subclasses) result in calling the trigger method.

        target - the object instance that contains the trigger method.

        methodName - the name of the trigger method. If the object does not contain the method or it contains more than one matching methods java.lang.IllegalArgumentException is thrown.

        arguments - the arguments to be passed to the trigger method.

        eventArgumentIndex - An index to the argument list. This index points out the argument that is replaced with the event object before the argument set is passed to the trigger method. If the eventArgumentIndex is negative, the triggering event object will not be passed to the trigger method, though it is still called.

        Throws:

        IllegalArgumentException - unless exactly one match methodName is found in target.

      • ListenerMethod

        public ListenerMethod​(Class<?> eventType,
                      SerializableEventListener listener,
                      String methodName,
                      Object[] arguments,
                      int eventArgumentIndex)
               throws IllegalArgumentException

        Constructs a new event listener from a trigger method name, it's arguments and the argument index specifying which one is replaced with the event object. The actual trigger method is reflected from object, and java.lang.IllegalArgumentException is thrown unless exactly one match is found.

        Parameters:

        eventType - the event type that is listener listens to. All events of this kind (or its subclasses) result in calling the trigger method.

        listener - the listener instance that contains the trigger method.

        methodName - the name of the trigger method. If the object does not contain the method or it contains more than one matching methods java.lang.IllegalArgumentException is thrown.

        arguments - the arguments to be passed to the trigger method.

        eventArgumentIndex - An index to the argument list. This index points out the argument that is replaced with the event object before the argument set is passed to the trigger method. If the eventArgumentIndex is negative, the triggering event object will not be passed to the trigger method, though it is still called.

        Throws:

        IllegalArgumentException - unless exactly one match methodName is found in target.

      • ListenerMethod

        @Deprecated
public ListenerMethod​(Class<?> eventType,
                      Object target,
                      Method method,
                      Object[] arguments)
               throws IllegalArgumentException
        Deprecated.

        Constructs a new event listener from the trigger method and it's arguments. Since the the index to the replaced parameter is not specified the event triggering this listener will not be passed to the trigger method.

        This constructor gets the trigger method as a parameter so it does not need to reflect to find it out.

        Parameters:

        eventType - the event type that is listener listens to. All events of this kind (or its subclasses) result in calling the trigger method.

        target - the object instance that contains the trigger method.

        method - the trigger method.

        arguments - the arguments to be passed to the trigger method.

        Throws:

        IllegalArgumentException - if method is not a member of target.

      • ListenerMethod

        public ListenerMethod​(Class<?> eventType,
                      SerializableEventListener listener,
                      Method method,
                      Object[] arguments)
               throws IllegalArgumentException

        Constructs a new event listener from the trigger method and it's arguments. Since the the index to the replaced parameter is not specified the event triggering this listener will not be passed to the trigger method.

        This constructor gets the trigger method as a parameter so it does not need to reflect to find it out.

        Parameters:

        eventType - the event type that is listener listens to. All events of this kind (or its subclasses) result in calling the trigger method.

        listener - the listener instance that contains the trigger method.

        method - the trigger method.

        arguments - the arguments to be passed to the trigger method.

        Throws:

        IllegalArgumentException - if method is not a member of target.

      • ListenerMethod

        @Deprecated
public ListenerMethod​(Class<?> eventType,
                      Object target,
                      String methodName,
                      Object[] arguments)
               throws IllegalArgumentException
        Deprecated.

        Constructs a new event listener from a trigger method name and it's arguments. Since the the index to the replaced parameter is not specified the event triggering this listener will not be passed to the trigger method.

        The actual trigger method is reflected from target, and java.lang.IllegalArgumentException is thrown unless exactly one match is found.

        Parameters:

        eventType - the event type that is listener listens to. All events of this kind (or its subclasses) result in calling the trigger method.

        target - the object instance that contains the trigger method.

        methodName - the name of the trigger method. If the object does not contain the method or it contains more than one matching methods java.lang.IllegalArgumentException is thrown.

        arguments - the arguments to be passed to the trigger method.

        Throws:

        IllegalArgumentException - unless exactly one match methodName is found in object.

      • ListenerMethod

        public ListenerMethod​(Class<?> eventType,
                      SerializableEventListener listener,
                      String methodName,
                      Object[] arguments)
               throws IllegalArgumentException

        Constructs a new event listener from a trigger method name and it's arguments. Since the the index to the replaced parameter is not specified the event triggering this listener will not be passed to the trigger method.

        The actual trigger method is reflected from listener, and java.lang.IllegalArgumentException is thrown unless exactly one match is found.

        Parameters:

        eventType - the event type that is listener listens to. All events of this kind (or its subclasses) result in calling the trigger method.

        listener - the listener instance that contains the trigger method.

        methodName - the name of the trigger method. If the object does not contain the method or it contains more than one matching methods java.lang.IllegalArgumentException is thrown.

        arguments - the arguments to be passed to the trigger method.

        Throws:

        IllegalArgumentException - unless exactly one match methodName is found in object.

      • ListenerMethod

        @Deprecated
public ListenerMethod​(Class<?> eventType,
                      Object target,
                      Method method)
               throws IllegalArgumentException
        Deprecated.

        Constructs a new event listener from a trigger method. Since the argument list is unspecified no parameters are passed to the trigger method when the listener is triggered.

        This constructor gets the trigger method as a parameter so it does not need to reflect to find it out.

        Parameters:

        eventType - the event type that is listener listens to. All events of this kind (or its subclasses) result in calling the trigger method.

        target - the object instance that contains the trigger method.

        method - the trigger method.

        Throws:

        IllegalArgumentException - if method is not a member of object.

      • ListenerMethod

        public ListenerMethod​(Class<?> eventType,
                      SerializableEventListener listener,
                      Method method)
               throws IllegalArgumentException

        Constructs a new event listener from a trigger method. Since the argument list is unspecified no parameters are passed to the trigger method when the listener is triggered.

        This constructor gets the trigger method as a parameter so it does not need to reflect to find it out.

        Parameters:

        eventType - the event type that is listener listens to. All events of this kind (or its subclasses) result in calling the trigger method.

        listener - the listener instance that contains the trigger method.

        method - the trigger method.

        Throws:

        IllegalArgumentException - if method is not a member of object.

      • ListenerMethod

        @Deprecated
public ListenerMethod​(Class<?> eventType,
                      Object target,
                      String methodName)
               throws IllegalArgumentException
        Deprecated.

        Constructs a new event listener from a trigger method name. Since the argument list is unspecified no parameters are passed to the trigger method when the listener is triggered.

        The actual trigger method is reflected from object, and java.lang.IllegalArgumentException is thrown unless exactly one match is found.

        Parameters:

        eventType - the event type that is listener listens to. All events of this kind (or its subclasses) result in calling the trigger method.

        target - the object instance that contains the trigger method.

        methodName - the name of the trigger method. If the object does not contain the method or it contains more than one matching methods java.lang.IllegalArgumentException is thrown.

        Throws:

        IllegalArgumentException - unless exactly one match methodName is found in target.

      • ListenerMethod

        public ListenerMethod​(Class<?> eventType,
                      SerializableEventListener listener,
                      String methodName)
               throws IllegalArgumentException

        Constructs a new event listener from a trigger method name. Since the argument list is unspecified no parameters are passed to the trigger method when the listener is triggered.

        The actual trigger method is reflected from listener, and java.lang.IllegalArgumentException is thrown unless exactly one match is found.

        Parameters:

        eventType - the event type that is listener listens to. All events of this kind (or its subclasses) result in calling the trigger method.

        listener - the listener instance that contains the trigger method.

        methodName - the name of the trigger method. If the object does not contain the method or it contains more than one matching methods java.lang.IllegalArgumentException is thrown.

        Throws:

        IllegalArgumentException - unless exactly one match methodName is found in target.

    • Method Detail

      • receiveEvent

        public void receiveEvent​(EventObject event)

        Receives one event from the EventRouter and calls the trigger method if it matches with the criteria defined for the listener. Only the events of the same or subclass of the specified event class result in the trigger method to be called.

        Parameters:

        event - the fired event. Unless the trigger method's argument list and the index to the to be replaced argument is specified, this event will not be passed to the trigger method.

      • matches

        public boolean matches​(Class<?> eventType,
                       Object target)

        Checks if the given object and event match with the ones stored in this listener.

        Parameters:

        target - the object to be matched against the object stored by this listener.

        eventType - the type to be tested for equality against the type stored by this listener.

        Returns:

        true if target is the same object as the one stored in this object and eventType equals the event type stored in this object. *

      • matches

        public boolean matches​(Class<?> eventType,
                       Object target,
                       Method method)

        Checks if the given object, event and method match with the ones stored in this listener.

        Parameters:

        target - the object to be matched against the object stored by this listener.

        eventType - the type to be tested for equality against the type stored by this listener.

        method - the method to be tested for equality against the method stored by this listener.

        Returns:

        true if target is the same object as the one stored in this object, eventType equals with the event type stored in this object and method equals with the method stored in this object.

      • hashCode

        public int hashCode()

        Overrides:

        hashCode in class Object

      • isType

        public boolean isType​(Class<?> eventType)

        Compares the type of this ListenerMethod to the given type.

        Parameters:

        eventType - The type to compare with

        Returns:

        true if this type of this ListenerMethod matches the given type, false otherwise

      • isOrExtendsType

        public boolean isOrExtendsType​(Class<?> eventType)

        Compares the type of this ListenerMethod to the given type.

        Parameters:

        eventType - The type to compare with

        Returns:

        true if this event type can be assigned to the given type, false otherwise

      • getTarget

        public Object getTarget()

        Returns the target object which contains the trigger method.

        Returns:

        The target object