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Top Description Fields Constructors Methods
java.beans

public Class Statement

extends Object
Class Inheritance
Known Direct Subclasses
java.beans.Expression
Imports
java.lang.reflect.AccessibleObject, .Array, .Constructor, .InvocationTargetException, .Method, com.sun.beans.finder.ClassFinder, .ConstructorFinder, .MethodFinder, sun.reflect.misc.MethodUtil
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.
Author
Philip Milne
Since
1.4

Field Summary

Modifier and TypeField and Description
private final Object[]
arguments

pack-priv static ExceptionListener
defaultExceptionListener

private static Object[]
emptyArray

pack-priv ClassLoader
loader

private final String
methodName

private final Object
target

Constructor Summary

AccessConstructor and Description
public
Statement(Object
the target object of this statement
target, String
the name of the method to invoke on the specified target
methodName, Object[]
the array of arguments to invoke the specified method
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 TypeMethod and Description
public void
execute()

The execute method finds a method whose name is the same as the methodName property, and invokes the method on the target.

public Object[]

Returns:

the array of arguments
getArguments()

Returns the arguments for the method to invoke.

pack-priv static Method
getMethod(Class<?> type, String name, Class<?>... args)

public String

Returns:

the name of the method
getMethodName()

Returns the name of the method to invoke.

public Object

Returns:

the target object of this statement
getTarget()

Returns the target object of this statement.

pack-priv String
instanceName(Object instance)

pack-priv Object
invoke()

public String
toString()

Overrides java.lang.Object.toString.

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

Inherited from java.lang.Object:
cloneequalsfinalizegetClasshashCodenotifynotifyAllwaitwaitwait

Field Detail

argumentsback to summary
private final Object[] arguments
defaultExceptionListenerback to summary
pack-priv static ExceptionListener defaultExceptionListener
emptyArrayback to summary
private static Object[] emptyArray
loaderback to summary
pack-priv ClassLoader loader
methodNameback to summary
private final String methodName
targetback to summary
private final Object target

Constructor Detail

Statementback to summary
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:Object

the target object of this statement

methodName:String

the name of the method to invoke on the specified target

arguments:Object[]

the array of arguments to invoke the specified method

Annotations
@ConstructorProperties:target, methodName, arguments

Method Detail

executeback to summary
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 java.lang.reflect.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 java.util.List interface may also be applied to array instances, mapping to the static methods of the same name in the Array class.
Exceptions
Exception:
that is thrown by the invoked method
NullPointerException:
if the value of the target or methodName property is null
NoSuchMethodException:
if a matching method is not found
See Also
java.lang.reflect.Method
getArgumentsback to summary
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:Object[]

the array of arguments

getMethodback to summary
pack-priv static Method getMethod(Class<?> type, String name, Class<?>... args)
getMethodNameback to summary
public String getMethodName()

Returns the name of the method to invoke. If this method returns null, the execute method throws a NullPointerException.

Returns:String

the name of the method

getTargetback to summary
public Object getTarget()

Returns the target object of this statement. If this method returns null, the execute method throws a NullPointerException.

Returns:Object

the target object of this statement

instanceNameback to summary
pack-priv String instanceName(Object instance)
invokeback to summary
pack-priv Object invoke() throws Exception
toStringback to summary
public String toString()

Overrides java.lang.Object.toString.

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

Annotations
@Override