com.blazebit.reflection

Class LazyGetterMethod

java.lang.Object

com.blazebit.reflection.LazyGetterMethod

public class LazyGetterMethod
extends Object

This class can be used to predefine a getter chain invocation but to be invoked later. It holds the source object on which to invoke the getter chain and the field names with which the getter methods are determined.

Since:

0.1.2

Author:

Christian Beikov

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
Object	invoke() Invokes the getter 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

LazyGetterMethod

public LazyGetterMethod(Object source,
                        String fieldNames)

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

Parameters:

source - The object on which to invoke the first getter

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

Method Detail

invoke

public Object invoke()
              throws InvocationTargetException,
                     IllegalAccessException

Invokes the getter chain based on the source object. First the source object is used as invocation target for the first getter then the results of the previous operations will be used for the invocation.

Example of how the chaining works:

class A{ B getB(){ // return b element } }

class B{ String getA(){ // return a element } }

new LazyGetterMethod(new A(), "a.b").invoke()

is equal to

new A().getB().getA()

Returns:

The result of the last getter in the chain

Throws:

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

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