moved files to core-java-modules/core-java-reflection

This commit is contained in:
Sjmillington
2019-09-03 19:47:15 +01:00
parent 06cbdfce02
commit 2da48b91e7
23 changed files with 29 additions and 16 deletions

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@@ -1,19 +0,0 @@
package com.baeldung.dynamicproxy;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
public class DynamicInvocationHandler implements InvocationHandler {
private static Logger LOGGER = LoggerFactory.getLogger(DynamicInvocationHandler.class);
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
LOGGER.info("Invoked method: {}", method.getName());
return 42;
}
}

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@@ -1,36 +0,0 @@
package com.baeldung.dynamicproxy;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class TimingDynamicInvocationHandler implements InvocationHandler {
private static Logger LOGGER = LoggerFactory.getLogger(TimingDynamicInvocationHandler.class);
private final Map<String, Method> methods = new HashMap<>();
private Object target;
TimingDynamicInvocationHandler(Object target) {
this.target = target;
for(Method method: target.getClass().getDeclaredMethods()) {
this.methods.put(method.getName(), method);
}
}
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
long start = System.nanoTime();
Object result = methods.get(method.getName()).invoke(target, args);
long elapsed = System.nanoTime() - start;
LOGGER.info("Executing {} finished in {} ns", method.getName(), elapsed);
return result;
}
}

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@@ -1,23 +0,0 @@
package com.baeldung.java.reflection;
public abstract class Animal implements Eating {
public static final String CATEGORY = "domestic";
private String name;
public Animal(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
protected abstract String getSound();
}

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@@ -1,36 +0,0 @@
package com.baeldung.java.reflection;
public class Bird extends Animal {
private boolean walks;
public Bird() {
super("bird");
}
public Bird(String name, boolean walks) {
super(name);
setWalks(walks);
}
public Bird(String name) {
super(name);
}
@Override
public String eats() {
return "grains";
}
@Override
protected String getSound() {
return "chaps";
}
public boolean walks() {
return walks;
}
public void setWalks(boolean walks) {
this.walks = walks;
}
}

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@@ -1,23 +0,0 @@
package com.baeldung.java.reflection;
import java.lang.annotation.Annotation;
public class DynamicGreeter implements Greeter {
private String greet;
public DynamicGreeter(String greet) {
this.greet = greet;
}
@Override
public Class<? extends Annotation> annotationType() {
return DynamicGreeter.class;
}
@Override
public String greet() {
return greet;
}
}

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@@ -1,5 +0,0 @@
package com.baeldung.java.reflection;
public interface Eating {
String eats();
}

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@@ -1,24 +0,0 @@
package com.baeldung.java.reflection;
public class Goat extends Animal implements Locomotion {
public Goat(String name) {
super(name);
}
@Override
protected String getSound() {
return "bleat";
}
@Override
public String getLocomotion() {
return "walks";
}
@Override
public String eats() {
return "grass";
}
}

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@@ -1,10 +0,0 @@
package com.baeldung.java.reflection;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
@Retention(RetentionPolicy.RUNTIME)
public @interface Greeter {
public String greet() default "";
}

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@@ -1,58 +0,0 @@
package com.baeldung.java.reflection;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Map;
public class GreetingAnnotation {
private static final String ANNOTATION_METHOD = "annotationData";
private static final String ANNOTATION_FIELDS = "declaredAnnotations";
private static final String ANNOTATIONS = "annotations";
public static void main(String ...args) {
Greeter greetings = Greetings.class.getAnnotation(Greeter.class);
System.err.println("Hello there, " + greetings.greet() + " !!");
Greeter targetValue = new DynamicGreeter("Good evening");
//alterAnnotationValueJDK8(Greetings.class, Greeter.class, targetValue);
alterAnnotationValueJDK7(Greetings.class, Greeter.class, targetValue);
greetings = Greetings.class.getAnnotation(Greeter.class);
System.err.println("Hello there, " + greetings.greet() + " !!");
}
@SuppressWarnings("unchecked")
public static void alterAnnotationValueJDK8(Class<?> targetClass, Class<? extends Annotation> targetAnnotation, Annotation targetValue) {
try {
Method method = Class.class.getDeclaredMethod(ANNOTATION_METHOD, null);
method.setAccessible(true);
Object annotationData = method.invoke(targetClass);
Field annotations = annotationData.getClass().getDeclaredField(ANNOTATIONS);
annotations.setAccessible(true);
Map<Class<? extends Annotation>, Annotation> map = (Map<Class<? extends Annotation>, Annotation>) annotations.get(annotationData);
map.put(targetAnnotation, targetValue);
} catch (Exception e) {
e.printStackTrace();
}
}
@SuppressWarnings("unchecked")
public static void alterAnnotationValueJDK7(Class<?> targetClass, Class<? extends Annotation> targetAnnotation, Annotation targetValue) {
try {
Field annotations = Class.class.getDeclaredField(ANNOTATIONS);
annotations.setAccessible(true);
Map<Class<? extends Annotation>, Annotation> map = (Map<Class<? extends Annotation>, Annotation>) annotations.get(targetClass);
System.out.println(map);
map.put(targetAnnotation, targetValue);
System.out.println(map);
} catch (Exception e) {
e.printStackTrace();
}
}
}

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@@ -1,6 +0,0 @@
package com.baeldung.java.reflection;
@Greeter(greet="Good morning")
public class Greetings {
}

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@@ -1,5 +0,0 @@
package com.baeldung.java.reflection;
public interface Locomotion {
String getLocomotion();
}

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@@ -1,21 +0,0 @@
package com.baeldung.java.reflection;
public class Operations {
public double publicSum(int a, double b) {
return a + b;
}
public static double publicStaticMultiply(float a, long b) {
return a * b;
}
private boolean privateAnd(boolean a, boolean b) {
return a && b;
}
protected int protectedMax(int a, int b) {
return a > b ? a : b;
}
}

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@@ -1,6 +0,0 @@
package com.baeldung.java.reflection;
public class Person {
private String name;
private int age;
}