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Handling privates and all other fields of an object
Roberto Gentili edited this page Sep 9, 2021
·
7 revisions
For fields handling we are going to use Fields component; Fields component uses to cache all fields for faster access.
import static org.burningwave.core.assembler.StaticComponentContainer.Fields;
import java.lang.reflect.Field;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import org.burningwave.core.classes.FieldCriteria;
@SuppressWarnings("unused")
public class FieldsHandler {
public static void execute() {
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
//Fast access by memory address
Collection<Class<?>> loadedClasses = Fields.getDirect(classLoader, "classes");
//Access by Reflection
loadedClasses = Fields.get(classLoader, "classes");
//Get all field values of an object through memory address access
Map<Field, ?> values = Fields.getAllDirect(classLoader);
//Get all field values of an object through reflection access
values = Fields.getAll(classLoader);
Object obj = new Object() {
volatile List<Object> objectValue;
volatile int intValue = 1;
volatile long longValue = 2l;
volatile float floatValue = 3f;
volatile double doubleValue = 4.1d;
volatile boolean booleanValue = true;
volatile byte byteValue = (byte)5;
volatile char charValue = 'c';
};
//Get all filtered field values of an object through memory address access
Fields.getAllDirect(
FieldCriteria.forEntireClassHierarchy().allThoseThatMatch(field -> {
return field.getType().isPrimitive();
}),
obj
).values();
}
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