public Expression(Object target,
    String methodName,
    Object[] arguments) 
{
        super(target, methodName, arguments);
}

Creates a new Statement object with a target, methodName and arguments as per the parameters.

Parameters:

target - The target of this expression.

methodName - The methodName of this expression.

arguments - The arguments of this expression. If null then an empty array will be used.

Also see:

getValue

 public Expression(Object value,
    Object target,
    String methodName,
    Object[] arguments) 
{
        this(target, methodName, arguments);
        setValue(value);
}

Creates a new Expression object for a method that returns a result. The result will never be calculated however, since this constructor uses the value parameter to set the value property by calling the setValue method.

Parameters:

value - The value of this expression.

target - The target of this expression.

methodName - The methodName of this expression.

arguments - The arguments of this expression. If null then an empty array will be used.

Also see:

setValue

 public Object getValue() throws Exception 
{
        if (value == unbound) {
            setValue(invoke());
        }
        return value;
}

If the value property of this instance is not already set, this method dynamically finds the method with the specified methodName on this target with these arguments and calls it. The result of the method invocation is first copied into the value property of this expression and then returned as the result of getValue. If the value property was already set, either by a call to setValue or a previous call to getValue then the value property is returned without either looking up or calling the method.

The value property of an Expression is set to a unique private (non-null) value by default and this value is used as an internal indication that the method has not yet been called. A return value of null replaces this default value in the same way that any other value would, ensuring that expressions are never evaluated more than once.

See the excecute method for details on how methods are chosen using the dynamic types of the target and arguments.

 String instanceName(Object instance) 
{
        return instance == unbound ? "< unbound >" : super.instanceName(instance);
}

 public  void setValue(Object value) 
{
        this.value = value;
}

Sets the value of this expression to value. This value will be returned by the getValue method without calling the method associated with this expression.

 public String toString() 
{
        return instanceName(value) + "=" + super.toString();
}

Prints the value of this expression using a Java-style syntax.