Class Statement
java.lang.Object
java.beans.Statement
- Direct Known Subclasses:
Expression
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
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionvoidexecute()Theexecutemethod finds a method whose name is the same as themethodNameproperty, and invokes the method on the target.Object[]Returns the arguments for the method to invoke.Returns the name of the method to invoke.Returns the target object of this statement.toString()Prints the value of this statement using a Java-style syntax.
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Constructor Details
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Statement
@ConstructorProperties({"target","methodName","arguments"}) public Statement(Object target, String methodName, Object[] arguments) Creates a newStatementobject for the specified target object to invoke the method specified by the name and by the array of arguments.The
targetand themethodNamevalues should not benull. Otherwise an attempt to execute thisExpressionwill result in aNullPointerException. If theargumentsvalue isnull, an empty array is used as the value of theargumentsproperty.- Parameters:
target- the target object of this statementmethodName- the name of the method to invoke on the specified targetarguments- the array of arguments to invoke the specified method
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Method Details
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getTarget
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getMethodName
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getArguments
Returns the arguments for the method to invoke. The number of arguments and their types must match the method being called.nullcan be used as a synonym of an empty array.- Returns:
- the array of arguments
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execute
Theexecutemethod finds a method whose name is the same as themethodNameproperty, 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 theMethodclass 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.
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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 thanStatements as they return a value. -
The method names "get" and "set" defined in the
Listinterface may also be applied to array instances, mapping to the static methods of the same name in theArrayclass.
- Throws:
NullPointerException- if the value of thetargetormethodNameproperty isnullNoSuchMethodException- if a matching method is not foundException- that is thrown by the invoked method- See Also:
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toString
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