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Handling privates and all other methods of an object
Burningwave edited this page Nov 20, 2020
·
4 revisions
For methods handling we are going to use Methods component; Methods component uses to cache all methods and all method handles for faster access.
import static org.burningwave.core.assembler.StaticComponentContainer.Classes;
import static org.burningwave.core.assembler.StaticComponentContainer.Methods;
import java.lang.invoke.MethodHandle;
import java.lang.reflect.Method;
import java.nio.ByteBuffer;
import java.security.ProtectionDomain;
import java.util.Collection;
import org.burningwave.core.classes.MethodCriteria;
@SuppressWarnings("unused")
public class MethodsHandler {
public static void execute() {
//Invoking method by using reflection
Methods.invoke(System.out, "println", "Hello World");
//Invoking static method by using MethodHandle
Integer number = Methods.invokeStaticDirect(Integer.class, "valueOf", 1);
//Invoking method by using MethodHandle
Methods.invokeDirect(System.out, "println", number);
//Filtering and obtaining a MethodHandle reference
MethodHandle methodHandle = Methods.findFirstDirectHandle(
MethodCriteria.byScanUpTo((cls) ->
//We only analyze the ClassLoader class and not all of its hierarchy (default behavior)
cls.getName().equals(ClassLoader.class.getName())
).name(
"defineClass"::equals
).and().parameterTypes(params ->
params.length == 3
).and().parameterTypesAreAssignableFrom(
String.class, ByteBuffer.class, ProtectionDomain.class
).and().returnType((cls) ->
cls.getName().equals(Class.class.getName())
), ClassLoader.class
);
//Filtering and obtaining all methods of ClassLoader class that have at least
//one input parameter of Class type
Collection<Method> methods = Methods.findAll(
MethodCriteria.byScanUpTo((cls) ->
//We only analyze the ClassLoader class and not all of its hierarchy (default behavior)
cls.getName().equals(ClassLoader.class.getName())
).parameter((params, idx) -> {
return Classes.isAssignableFrom(params[idx].getType(), Class.class);
}), ClassLoader.class
);
methods.stream();
}
public static void main(String[] args) {
execute();
}
}
Burningwave core is a fully indipendent, advanced, free and open source Java frameworks building library that contains AN EXTREMELY POWERFUL CLASSPATH SCANNER.
To include Burningwave Core library in your projects simply use with Apache Maven:
<dependency>
<groupId>org.burningwave</groupId>
<artifactId>core</artifactId>
<version>12.65.2</version>
</dependency>
To use Burningwave Core as a Java module add the following to your module-info.java
:
requires org.burningwave.core;
ClassFactory
ClassHunter
- In depth look to and configuration guide
- USE CASE: retrieving all classes of the classpath
- USE CASE: retrieving all classes that implement one or more interfaces
- USE CASE: finding all classes that extend a base class
- USE CASE: searching for all classes that have package name that matches a regex
- USE CASE: finding all classes for module name (Java 9 and later)
- USE CASE: finding all annotated classes
- USE CASE: how to scan classes for specific annotations and collect its values
- USE CASE: searching for all classes with a constructor that takes a specific type as first parameter and with at least 2 methods that begin for a given string
- USE CASE: searching for all classes with methods whose name begins for a given string and that takes a specific type as its first parameter
- USE CASE: finding all classes that have at least 2 protected fields