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package org.onap.sdc.dcae.catalog.commons;
import java.util.List;
import java.util.Map;
import java.util.Collections;
import java.util.stream.Collectors;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.Type;
import java.lang.reflect.Method;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.invoke.MethodHandles;
import com.google.common.reflect.Invokable;
import com.google.common.reflect.AbstractInvocationHandler;
import org.apache.commons.beanutils.ConvertUtils;
/**
*/
public class Proxy
extends AbstractInvocationHandler {
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public static @interface DataMap {
public String map() default "";
public boolean proxy() default false;
public Class elementType() default Void.class;
}
public static Constructor<MethodHandles.Lookup> lookupHandleConstructor;
static {
try {
lookupHandleConstructor =
MethodHandles.Lookup.class.getDeclaredConstructor(Class.class,
int.class);
if (!lookupHandleConstructor.isAccessible()) {
lookupHandleConstructor.setAccessible(true);
}
}
catch (Exception x) {
throw new RuntimeException(x);
}
}
private Map data;
private ProxyBuilder builder;
protected Proxy(Map theData, ProxyBuilder theBuilder) {
this.data = theData;
this.builder = theBuilder;
}
public Map data() {
return this.data;
}
public ProxyBuilder getBuilder() {
return this.builder;
}
protected Object handleInvocation(
Object theProxy,Method theMethod,Object[] theArgs)
throws Throwable {
if (theMethod.isDefault()) {
final Class<?> declaringClass = theMethod.getDeclaringClass();
/*
return MethodHandles.lookup()
.in(declaringClass)
.unreflectSpecial(theMethod, declaringClass)
.bindTo(theProxy)
.invokeWithArguments(theArgs);
*/
return lookupHandleConstructor
.newInstance(declaringClass, MethodHandles.Lookup.PRIVATE)
.unreflectSpecial(theMethod, declaringClass)
.bindTo(theProxy)
.invokeWithArguments(theArgs);
}
String key = theMethod.getName();
Proxy.DataMap dataMap = (Proxy.DataMap)theMethod.getAnnotation(Proxy.DataMap.class);
if (dataMap != null) {
String dataKey = dataMap.map();
if (dataKey != null && !"".equals(dataKey))
key = dataKey;
}
//this is ugly, can this be done through an extension mechanism such as plugging in functions?
if ( builder.hasExtension(key) )
return this.builder.extension(key).apply(this, theArgs);
Object val = this.data.getOrDefault(key, this.builder.context(key));
System.out.println("!! " + key + " : " + val);
//as we create proxies here we should store them back in the 'data' so that we do not do it again
//can we always 'recognize' them?
if (val instanceof String &&
String.class != theMethod.getReturnType()) {
return ConvertUtils.convert((String)val, theMethod.getReturnType());
}
else if (val instanceof Map) {
if (dataMap != null && dataMap.proxy()) {
return builder.build((Map)val, theMethod.getReturnType());
}
}
else if (val instanceof List) {
if (dataMap != null && dataMap.proxy()) {
return ((List)val)
.stream()
.map(e -> this.builder.build((Map)e, dataMap.elementType()))
.collect(Collectors.toList());
}
}
/*
else if (val.getClass().isArray()) {
if (dataMap != null && dataMap.proxy()) {
}
}
*/
return val;
}
}
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