JarCastinggeneric-reflection
Java reflection with generic resolver
Synopsis
This library makes it easy to obtain type information including generic type parameter bindings easily at runtime.
For example:
class BaseClass<A, B> {
public Map<A, List<B>> doSomethingCrazy(A[] arg1, Collection<? extends B>[] arg2) { ... }
}
class SubClass extends BaseClass<String, Integer> {
}
To find out the return type and parameter types of SubClass.doSomethingCrazy():
TypeInfo<?> typeInfo = Reflection.getTypeInfo(SubClass.class);
MethodInfo methodInfo = typeInfo.getPublicMethods().get(0);
TypeInfo<?> returnType = methodInfo.getReturnType();
System.out.println(returnType.toString()); // Prints java.util.Map<java.lang.String, java.util.List<java.lang.Integer>>
List<ParameterInfo> parameters = methodInfo.getParameters();
System.out.println(parameters.get(0).getType().toString()); // Prints java.lang.String[]
System.out.println(parameters.get(1).getType().toString()); // Prints java.util.Collection<? extends java.lang.Integer>[]
Setup
Maven
<dependency>
<groupId>com.github.zerkseez</groupId>
<artifactId>generic-reflection</artifactId>
<version>1.0.0</version>
</dependency>
Basic Use Cases
To obtain information for any type:
TypeInfo<?> typeInfo1 = Reflection.getTypeInfo(MyClass.class);
TypeInfo<?> typeInfo2 = Reflection.getTypeInfo("com.mycompany.MyClass");
Get all public methods, including inherited ones:
List<MethodInfo> publicMethods = typeInfo.getPublicMethods();
Get return type and the parameter types for a method:
MethodInfo method = ...
TypeInfo<?> returnType = method.getReturnType();
List<ParameterInfo> parameters = method.getParameters();
for (ParameterInfo parameter : parameters) {
TypeInfo<?> parameterType = parameter.getType();
...
}
License
Apache License, Version 2.0