com.caoccao.javet.interop.converters.JavetProxyConverter Maven / Gradle / Ivy
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/*
* Copyright (c) 2021-2022. caoccao.com Sam Cao
*
* 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 com.caoccao.javet.interop.converters;
import com.caoccao.javet.annotations.CheckReturnValue;
import com.caoccao.javet.annotations.V8Convert;
import com.caoccao.javet.enums.V8ProxyMode;
import com.caoccao.javet.exceptions.JavetException;
import com.caoccao.javet.interop.V8Runtime;
import com.caoccao.javet.interop.V8Scope;
import com.caoccao.javet.interop.callback.JavetCallbackContext;
import com.caoccao.javet.interop.proxy.IJavetProxyHandler;
import com.caoccao.javet.interop.proxy.JavetDynamicProxyClassHandler;
import com.caoccao.javet.interop.proxy.JavetDynamicProxyFunctionHandler;
import com.caoccao.javet.interop.proxy.JavetDynamicProxyObjectHandler;
import com.caoccao.javet.values.V8Value;
import com.caoccao.javet.values.primitive.V8ValueLong;
import com.caoccao.javet.values.reference.IV8ValueObject;
import com.caoccao.javet.values.reference.V8ValueFunction;
import com.caoccao.javet.values.reference.V8ValueProxy;
import java.util.List;
/**
* The type Javet proxy converter converts most of Java objects to
* JS objects via JS proxy bi-directionally.
*
* Java Primitive types, Array, List, Set and Map are converted to the
* corresponding types in JS. Set and Map conversion can be disabled
* via config.
*
* @since 0.9.6
*/
@SuppressWarnings("unchecked")
public class JavetProxyConverter extends JavetObjectConverter {
/**
* The constant DUMMY_FUNCTION_STRING contains a JS code snippet
* which creates an empty anonymous function hidden in a closure.
* The purpose is to avoid polluting the context because a
* non-anonymous function can possibly conflict with a variable
* with the same name in the same context.
*
* @since 0.9.8
*/
protected static final String DUMMY_FUNCTION_STRING =
"(() => {\n" +
" const DummyFunction = function () { };\n" +
" return DummyFunction;\n" +
"})();";
/**
* Instantiates a new Javet proxy converter.
*
* @since 0.9.6
*/
public JavetProxyConverter() {
super();
}
/**
* To proxied V8 value.
*
* @param the type parameter
* @param v8Runtime the V8 runtime
* @param object the object
* @return the proxied V8 value
* @throws JavetException the javet exception
*/
@CheckReturnValue
protected T toProxiedV8Value(V8Runtime v8Runtime, Object object) throws JavetException {
V8Value v8Value;
V8ProxyMode proxyMode = V8ProxyMode.Object;
if (object instanceof Class) {
if (V8ProxyMode.isClassMode((Class) object)) {
proxyMode = V8ProxyMode.Class;
}
} else if (object.getClass().isAnnotationPresent(V8Convert.class)) {
V8Convert v8Convert = object.getClass().getAnnotation(V8Convert.class);
if (v8Convert.proxyMode() == V8ProxyMode.Function) {
proxyMode = V8ProxyMode.Function;
}
}
try (V8Scope v8Scope = v8Runtime.getV8Scope()) {
V8ValueProxy v8ValueProxy;
switch (proxyMode) {
case Class:
case Function:
try (V8ValueFunction v8ValueFunction = v8Runtime.createV8ValueFunction(DUMMY_FUNCTION_STRING)) {
v8ValueProxy = v8Scope.createV8ValueProxy(v8ValueFunction);
}
break;
default:
v8ValueProxy = v8Scope.createV8ValueProxy();
break;
}
try (IV8ValueObject iV8ValueObjectHandler = v8ValueProxy.getHandler()) {
IJavetProxyHandler javetProxyHandler;
switch (proxyMode) {
case Class:
javetProxyHandler = new JavetDynamicProxyClassHandler<>(
v8Runtime, config.getDynamicObjectFactory(), (Class) object);
break;
case Function:
javetProxyHandler = new JavetDynamicProxyFunctionHandler<>(
v8Runtime, config.getDynamicObjectFactory(), object);
break;
default:
javetProxyHandler = new JavetDynamicProxyObjectHandler<>(
v8Runtime, config.getDynamicObjectFactory(), object);
break;
}
List javetCallbackContexts = iV8ValueObjectHandler.bind(javetProxyHandler);
try (V8ValueLong v8ValueLongHandle = v8Runtime.createV8ValueLong(
javetCallbackContexts.get(0).getHandle())) {
iV8ValueObjectHandler.setPrivateProperty(PRIVATE_PROPERTY_PROXY_TARGET, v8ValueLongHandle);
}
}
v8Value = v8ValueProxy;
v8Scope.setEscapable();
}
return (T) v8Value;
}
@Override
@CheckReturnValue
protected T toV8Value(
V8Runtime v8Runtime, Object object, final int depth) throws JavetException {
if (object instanceof V8Value) {
return (T) object;
}
V8Value v8Value = super.toV8Value(v8Runtime, object, depth);
if (v8Value != null && !(v8Value.isUndefined())) {
return (T) v8Value;
}
return toProxiedV8Value(v8Runtime, object);
}
}