com.blazebit.reflection

Class PropertyPathExpression<X,Y>

java.lang.Object

com.blazebit.reflection.PropertyPathExpression<X,Y>

All Implemented Interfaces:

ValueAccessor<X,Y>, ValueRetriever<X,Y>

public class PropertyPathExpression<X,Y>
extends Object
implements ValueAccessor<X,Y>

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:

1.0

Author:

Christian Beikov

Constructor Summary

Constructors

Constructor and Description
PropertyPathExpression(Class<X> source, String propertyPath)
PropertyPathExpression(Class<X> source, String propertyPath, boolean allowFieldAccess)

Method Summary

Modifier and Type	Method and Description
Y	getNullSafeValue(X target)
Y	getValue(X target) Invokes the getter chain based on the source object.
void	setValue(X target, Y value) Sets the given value specified in the target object.

Methods inherited from class java.lang.Object

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

Constructor Detail

PropertyPathExpression

public PropertyPathExpression(Class<X> source,
                              String propertyPath)

PropertyPathExpression

public PropertyPathExpression(Class<X> source,
                              String propertyPath,
                              boolean allowFieldAccess)

Method Detail

getValue

public final Y getValue(X target)

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()

Specified by:

getValue in interface ValueRetriever<X,Y>

Parameters:

target - The target object from which to retrieve the value.

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[])

getNullSafeValue

public final Y getNullSafeValue(X target)

setValue

public final void setValue(X target,
                           Y value)

Description copied from interface: ValueAccessor

Sets the given value specified in the target object. An implementation may throw RuntimeExceptions.

Specified by:

setValue in interface ValueAccessor<X,Y>

Parameters:

target - The target object on which to set the given value.

value - The new value of the target object.