Module java.desktop
Package java.beans

Class Statement

java.lang.Object
java.beans.Statement
Direct Known Subclasses:
Expression

public class Statement
extends Object
A Statement object represents a primitive statement in which a single method is applied to a target and a set of arguments - as in "a.setFoo(b)". Note that where this example uses names to denote the target and its argument, a statement object does not require a name space and is constructed with the values themselves. The statement object associates the named method with its environment as a simple set of values: the target and an array of argument values.
Since:
1.4
  • Constructor Summary

    Constructors
    Constructor Description
    Statement​(Object target, String methodName, Object[] arguments)
    Creates a new Statement object for the specified target object to invoke the method specified by the name and by the array of arguments.
  • Method Summary

    Modifier and Type Method Description
    void execute()
    The execute method finds a method whose name is the same as the methodName property, and invokes the method on the target.
    Object[] getArguments()
    Returns the arguments for the method to invoke.
    String getMethodName()
    Returns the name of the method to invoke.
    Object getTarget()
    Returns the target object of this statement.
    String toString()
    Prints the value of this statement using a Java-style syntax.

    Methods declared in class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
  • Constructor Details

    • Statement

      @ConstructorProperties({"target","methodName","arguments"}) public Statement(Object target, String methodName, Object[] arguments)
      Creates a new Statement object for the specified target object to invoke the method specified by the name and by the array of arguments.

      The target and the methodName values should not be null. Otherwise an attempt to execute this Expression will result in a NullPointerException. If the arguments value is null, an empty array is used as the value of the arguments property.

      Parameters:
      target - the target object of this statement
      methodName - the name of the method to invoke on the specified target
      arguments - the array of arguments to invoke the specified method
  • Method Details

    • getTarget

      public Object getTarget()
      Returns the target object of this statement. If this method returns null, the execute() method throws a NullPointerException.
      Returns:
      the target object of this statement
    • getMethodName

      public String getMethodName()
      Returns the name of the method to invoke. If this method returns null, the execute() method throws a NullPointerException.
      Returns:
      the name of the method
    • getArguments

      public Object[] getArguments()
      Returns the arguments for the method to invoke. The number of arguments and their types must match the method being called. null can be used as a synonym of an empty array.
      Returns:
      the array of arguments
    • execute

      public void execute() throws Exception
      The execute method finds a method whose name is the same as the methodName property, and invokes the method on the target. When the target's class defines many methods with the given name the implementation should choose the most specific method using the algorithm specified in the Java Language Specification (15.11). The dynamic class of the target and arguments are used in place of the compile-time type information and, like the Method class itself, conversion between primitive values and their associated wrapper classes is handled internally.

      The following method types are handled as special cases:

      • Static methods may be called by using a class object as the target.
      • The reserved method name "new" may be used to call a class's constructor as if all classes defined static "new" methods. Constructor invocations are typically considered Expressions rather than Statements as they return a value.
      • The method names "get" and "set" defined in the List interface may also be applied to array instances, mapping to the static methods of the same name in the Array class.
      Throws:
      NullPointerException - if the value of the target or methodName property is null
      NoSuchMethodException - if a matching method is not found
      SecurityException - if a security manager exists and it denies the method invocation
      Exception - that is thrown by the invoked method
      See Also:
      Method
    • toString

      public String toString()
      Prints the value of this statement using a Java-style syntax.
      Overrides:
      toString in class Object
      Returns:
      a string representation of the object.