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/*
* Copyright (c) 2017 <AT&T>. All rights reserved.
* ===================================================================
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for
* the specific language governing permissions and limitations under the License.
*/
package org.onap.tosca.checker.model;
import java.util.List;
import java.util.LinkedList;
import java.util.Map;
import java.util.HashMap;
import java.util.Collections;
import java.util.stream.Collectors;
import java.util.function.Function;
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;
/**
*/
public class TOSCAProxy
extends AbstractInvocationHandler {
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);
}
}
protected static <T> Class<T> typeArgument(Class theType) {
return (Class<T>)
((ParameterizedType)theType.getGenericInterfaces()[0]).
getActualTypeArguments()[0];
}
private static Map proxyRecords = new HashMap();
/** */
public static Object record(Object theRef, Function theProxyBuilder) {
return proxyRecords.computeIfAbsent(theRef, theProxyBuilder);
}
/* a version allowing for the 'decoration/wrapping' of a basic list
*/
public static <T extends List> T buildList(final List theInfo, Class<T> theType) {
return (T)java.lang.reflect.Proxy.newProxyInstance(
TOSCAProxy.class.getClassLoader(),
new Class[] { theType },
new AbstractInvocationHandler() {
protected Object handleInvocation(Object theProxy,Method theMethod,Object[] theArgs)
throws Throwable {
return theMethod.invoke(theInfo, theArgs);
}
});
}
/*
* This is targeted at lists of one entry maps seen in in the TOSCA spec
*/
public static <T extends TOSCASeq> T buildSeq(final List<Map> theInfo, Class<T> theType) {
theInfo.replaceAll((value) -> { Map.Entry<String,Map> entry = (Map.Entry<String,Map>)
value.entrySet().iterator().next();
return buildObject(entry.getKey(), entry.getValue(), typeArgument(theType));
});
return (T)java.lang.reflect.Proxy.newProxyInstance(
TOSCAProxy.class.getClassLoader(),
new Class[] { theType },
new AbstractInvocationHandler() {
protected Object handleInvocation(Object theProxy,Method theMethod,Object[] theArgs)
throws Throwable {
//A Seq is nothing but a List so just propagate the call ..
return theMethod.invoke(theInfo, theArgs);
}
});
}
/*
* All entries in the map will become TOSCAObject instances (used for collections of constructs)
*/
public static <T extends TOSCAMap> T buildMap(String theName, Map<String, ?> theInfo, Class<T> theType) {
theInfo.replaceAll((name, value) -> {
return
value instanceof Map ?
buildObject(name, (Map)value, typeArgument(theType)) :
buildObject(name, Collections.singletonMap("value", value), typeArgument(theType));
});
return buildObject(theName, theInfo, theType);
}
public static <T> T buildObject(String theName, Map theInfo, Class<T> theType) {
return (T)java.lang.reflect.Proxy.newProxyInstance(
TOSCAProxy.class.getClassLoader(),
new Class[] { theType /*, Map.class*/ },
new TOSCAProxy(theName, theInfo));
}
/*
public static <T> T build(String theName, Map theInfo, Class<T> theType) {
if (TOSCAMap.class.isAssignableFrom(theType))
return buildMap(theName, theInfo, (Class<TOSCAMap>)theType);
else
return buildObject(theName, theInfo, theType);
}
*/
private String name;
private Map info;
protected TOSCAProxy(String theName, Map theInfo) {
this.name = theName;
this.info = theInfo;
}
protected Object handleInvocation(
Object theProxy,Method theMethod,Object[] theArgs)
throws Throwable {
//System.out.println(" ** proxy looking for " + theMethod + " in " + name + "&" + info);
//if the method was declared in Map.class, just default to 'info' (we should make this read only)
if (Map.class.equals(theMethod.getDeclaringClass())) {
return theMethod.invoke(this.info, theArgs);
}
if (theMethod.isDefault()) {
final Class<?> declaringClass = theMethod.getDeclaringClass();
return lookupHandleConstructor
.newInstance(declaringClass, MethodHandles.Lookup.PRIVATE)
.unreflectSpecial(theMethod, declaringClass)
.bindTo(theProxy)
.invokeWithArguments(theArgs);
}
if ("info".equals(theMethod.getName())) {
return this.info;
}
if ("name".equals(theMethod.getName())) {
return this.name;
}
return this.info.get(theMethod.getName());
}
}
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