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Add method to construct classes using reflection

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This commit is contained in:
Mark Vainomaa 2017-02-24 15:45:00 +02:00
parent de3429bd89
commit 224780a84d
3 changed files with 59 additions and 0 deletions
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37
Reflect/src/main/java/eu/mikroskeem/utils/reflect/Reflect.java
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@ -1,11 +1,16 @@
package eu.mikroskeem.utils.reflect;
import lombok.Getter;
import lombok.RequiredArgsConstructor;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.stream.Collectors;
import java.util.stream.Stream;
/**
* Reflection utils
@ -39,6 +44,27 @@ public class Reflect {
return getClass(clazz) != null;
}
/**
* Construct class with arguments. Note: primitive types aren't supported
*
*
* @param clazz Class to construct
* @param arguments Class constructor arguments
* @return Class instance or null
*/
public static Object fastConstruct(@NotNull Class<?> clazz, TypeWrapper... arguments){
try {
Class<?>[] tArgs = Stream.of(arguments).map(TypeWrapper::getType).collect(Collectors.toList()).toArray(new Class[0]);
Object[] args = Stream.of(arguments).map(TypeWrapper::getValue).collect(Collectors.toList()).toArray();
Constructor constructor = clazz.getDeclaredConstructor(tArgs);
constructor.setAccessible(true);
return constructor.newInstance(args);
} catch (NoSuchMethodException|InstantiationException|IllegalAccessException|InvocationTargetException e){
e.printStackTrace();
return null;
}
}
/**
* Get declared class method (public,protected,private)
*
@ -188,4 +214,15 @@ public class Reflect {
}
return null;
}
/**
* Type/value wrapper for reflective constructing
*/
@RequiredArgsConstructor
@Getter
public static class TypeWrapper {
private final Object value;
private final Class<?> type;
}
}

6
Reflect/src/test/java/eu/mikroskeem/utils/test/reflect/DifferentConstructors.java Normal file
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@ -0,0 +1,6 @@
package eu.mikroskeem.utils.test.reflect;
public class DifferentConstructors {
public DifferentConstructors(Integer a, Integer b, int c, boolean d){}
private DifferentConstructors(String foo, String bar){}
}

16
Reflect/src/test/java/eu/mikroskeem/utils/test/reflect/TestReflect.java
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@ -112,4 +112,20 @@ public class TestReflect {
Assert.assertTrue(Reflect.classExists(className));
Assert.assertEquals("hey", testFieldContent);
}
@Test
public void testConstructing(){
Assert.assertNotNull(Reflect.fastConstruct(
DifferentConstructors.class,
new Reflect.TypeWrapper(1, Integer.class),
new Reflect.TypeWrapper(2, Integer.class),
new Reflect.TypeWrapper(3, int.class),
new Reflect.TypeWrapper(true, boolean.class)
));
Assert.assertNotNull(Reflect.fastConstruct(
DifferentConstructors.class,
new Reflect.TypeWrapper("kek", String.class),
new Reflect.TypeWrapper("kek", String.class)
));
}
}