- java.lang.Object
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- java.beans.Statement
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- Direct Known Subclasses:
Expression
public class Statement extends Object
AStatementobject 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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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description voidexecute()Theexecutemethod finds a method whose name is the same as themethodNameproperty, and invokes the method on the target.Object[]getArguments()Returns the arguments for the method to invoke.StringgetMethodName()Returns the name of the method to invoke.ObjectgetTarget()Returns the target object of this statement.StringtoString()Prints the value of this statement using a Java-style syntax.
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Constructor Detail
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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 Detail
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getTarget
public Object getTarget()
Returns the target object of this statement. If this method returnsnull, theexecute()method throws aNullPointerException.- Returns:
- the target object of this statement
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getMethodName
public String getMethodName()
Returns the name of the method to invoke. If this method returnsnull, theexecute()method throws aNullPointerException.- Returns:
- the name of the method
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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.nullcan be used as a synonym of an empty array.- Returns:
- the array of arguments
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execute
public void execute() throws ExceptionTheexecutemethod 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 foundSecurityException- if a security manager exists and it denies the method invocationException- that is thrown by the invoked method- See Also:
Method
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