com.caoccao.javet.interop.proxy.JavetReflectionProxyInterceptor Maven / Gradle / Ivy

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Javet is Java + V8 (JAVa + V + EighT). It is an awesome way of embedding Node.js and V8 in Java.
There is a newer version: 4.0.0
/*
 * Copyright (c) 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.proxy;

import com.caoccao.javet.exceptions.JavetError;
import com.caoccao.javet.exceptions.JavetException;
import com.caoccao.javet.interop.callback.IJavetDirectCallable;
import com.caoccao.javet.interop.callback.JavetCallbackContext;
import com.caoccao.javet.interop.callback.JavetCallbackType;
import com.caoccao.javet.utils.SimpleMap;
import com.caoccao.javet.utils.V8ValueUtils;
import com.caoccao.javet.values.V8Value;
import com.caoccao.javet.values.reference.V8ValueObject;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;

/**
 * The type Javet reflection proxy interceptor.
 *
 * @since 0.9.6
 */
final class JavetReflectionProxyInterceptor {
    private static final String METHOD_NAME_INVOKE = "invoke";
    private final String jsMethodName;
    private final List methods;
    private final IJavetReflectionObjectFactory reflectionObjectFactory;
    private final Object targetObject;

    /**
     * Instantiates a new Javet reflection proxy interceptor.
     *
     * @param reflectionObjectFactory the reflection object factory
     * @param targetObject            the target object
     * @param jsMethodName            the JS method name
     * @param methods                 the methods
     * @since 0.9.6
     */
    public JavetReflectionProxyInterceptor(
            IJavetReflectionObjectFactory reflectionObjectFactory,
            Object targetObject,
            String jsMethodName,
            List methods) {
        this.reflectionObjectFactory = reflectionObjectFactory;
        this.jsMethodName = jsMethodName;
        this.methods = methods;
        this.targetObject = targetObject;
    }


    /**
     * Gets callback context.
     *
     * @return the callback context
     * @since 0.9.6
     */
    public JavetCallbackContext getCallbackContext() {
        return new JavetCallbackContext(
                METHOD_NAME_INVOKE, JavetCallbackType.DirectCallThisAndResult,
                (IJavetDirectCallable.ThisAndResult) this::invokeV8Value);
    }

    /**
     * Gets JS method name.
     *
     * @return the JS method name
     * @since 0.9.6
     */
    public String getJSMethodName() {
        return jsMethodName;
    }

    /**
     * Gets methods.
     *
     * @return the methods
     * @since 0.9.6
     */
    public List getMethods() {
        return methods;
    }

    /**
     * Gets target object.
     *
     * @return the target object
     * @since 0.9.6
     */
    public Object getTargetObject() {
        return targetObject;
    }

    /**
     * Invoke and return object.
     *
     * @param thisObject this object
     * @param v8Values   the V8 values
     * @return the object
     * @throws JavetException the javet exception
     * @since 0.9.6
     */
    public Object invokeObject(V8ValueObject thisObject, V8Value... v8Values) throws JavetException {
        try {
            return BaseJavetReflectionProxyHandler.execute(
                    reflectionObjectFactory,
                    targetObject,
                    thisObject,
                    methods,
                    V8ValueUtils.convertToVirtualObjects(v8Values));
        } catch (JavetException e) {
            throw e;
        } catch (InvocationTargetException e) {
            throw new JavetException(JavetError.CallbackMethodFailure,
                    SimpleMap.of(
                            JavetError.PARAMETER_METHOD_NAME, jsMethodName,
                            JavetError.PARAMETER_MESSAGE, e.getTargetException().getMessage()),
                    e.getTargetException());
        } catch (Throwable t) {
            throw new JavetException(JavetError.CallbackMethodFailure,
                    SimpleMap.of(
                            JavetError.PARAMETER_METHOD_NAME, jsMethodName,
                            JavetError.PARAMETER_MESSAGE, t.getMessage()),
                    t);
        }
    }

    /**
     * Invoke and return V8 value.
     *
     * @param thisObject this object
     * @param v8Values   the V8 values
     * @return the V8 value
     * @throws JavetException the javet exception
     */
    public V8Value invokeV8Value(V8Value thisObject, V8Value... v8Values) throws JavetException {
        return thisObject.getV8Runtime().toV8Value(invokeObject((V8ValueObject) thisObject, v8Values));
    }
}