com.blazebit.reflection

Class LazySetterMethod

java.lang.Object

com.blazebit.reflection.LazySetterMethod

public class LazySetterMethod
extends Object

This class is a lazy setter that can be invoked later. Basically this class just holds the target object on which to invoke the setter, the field name via which the setter method is determined and the arguments that should be passed as parameters to the setter.

Since:

0.1.2

Author:

Christian Beikov

Constructor Summary

Constructors

Constructor and Description
LazySetterMethod(Object target, String fieldNames, LazyGetterMethod value) Constructs a LazySetterMethod object for the given source object, field names as a string separated by '.'
LazySetterMethod(Object target, String fieldNames, Object value) Constructs a LazySetterMethod object for the given source object, field names as a string separated by '.'

Method Summary

Modifier and Type	Method and Description
void	invoke() Invokes the getter/setter chain based on the source object.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LazySetterMethod

public LazySetterMethod(Object target,
                        String fieldNames,
                        Object value)

Constructs a LazySetterMethod object for the given source object, field names as a string separated by '.' (dots) and arguments. Using this constructor is equal to # LazySetterMethod#LazySetterMethod(java.lang.Object, java.lang.String[], java.lang.Object[]) with the second parameter fieldNames.split("\\.").

Parameters:

target - The object on which to invoke the getter/setter chain

fieldNames - The field names which should be used for the setter determination

args - The arguments used for the setter method

LazySetterMethod

public LazySetterMethod(Object target,
                        String fieldNames,
                        LazyGetterMethod value)

Constructs a LazySetterMethod object for the given source object, field names as a string separated by '.' (dots) and arguments.

This constructor is equal to # LazySetterMethod#LazySetterMethod(java.lang.Object, java.lang.String, java.lang.Object[]) except that this constructor shows that #LazyGetterMethod also can be used as parameter. The LazyGetterMethods will be invoked lazily

Parameters:

target - The object on which to invoke the getter/setter chain

fieldNames - The field names which should be used for the setter determination

args - The arguments used for the setter method

Method Detail

invoke

public void invoke()
            throws InvocationTargetException,
                   IllegalAccessException

Invokes the getter/setter chain based on the source object. First of all the actual arguments are determined by invoking LazyGetterMethod objects that have been passed during construction. Then the getter chain is invoked to determine the actual object on which to invoke the setter. Finally the setter is invoked with the actual arguments

Example of how the chaining works:

class A{ private B b;

public A(B b){ this.b = b; }

public B getB(){ return b; } }

class B{ private String s;

public B(String s){ this.s = s; }

public void setS(String s){ this.s = s; } }

new LazySetterMethod(new A(new B("")), "b.s", "value").invoke()

is equal to

new A(new B("")).getB().setS("test");

and

new LazySetterMethod(new A(new B("")), "b.s", new LazyGetterMethod(new B("lazyValue"), "s").invoke()

is equal to

new A(new B("")).getB().setS(new B("lazyValue").getS());

Throws:

InvocationTargetException - #Method.invoke(java.lang.Object, java.lang.Object[])

IllegalAccessException - #Method.invoke(java.lang.Object, java.lang.Object[])