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Javet is Java + V8 (JAVa + V + EighT). It is an awesome way of embedding Node.js and V8 in Java.
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/*
 * 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.binding;

import com.caoccao.javet.annotations.V8Convert;
import com.caoccao.javet.enums.V8ConversionMode;
import com.caoccao.javet.enums.V8ProxyMode;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.*;

/**
 * The type Class descriptor.
 *
 * @since 1.1.7
 */
public class ClassDescriptor {
    /**
     * The Apply functions.
     *
     * @since 1.1.7
     */
    protected List applyFunctions;
    /**
     * The Constructors.
     *
     * @since 0.9.8
     */
    protected List> constructors;
    /**
     * The Field map.
     *
     * @since 0.9.7
     */
    protected Map fieldMap;
    /**
     * The Generic getters.
     *
     * @since 0.9.6
     */
    protected List genericGetters;
    /**
     * The Generic setters.
     *
     * @since 0.9.6
     */
    protected List genericSetters;
    /**
     * The Getters map.
     *
     * @since 0.9.6
     */
    protected Map> gettersMap;
    /**
     * The Methods map.
     *
     * @since 0.9.6
     */
    protected Map> methodsMap;
    /**
     * The Proxy mode.
     *
     * @since 0.9.9
     */
    protected V8ProxyMode proxyMode;
    /**
     * The Setters map.
     *
     * @since 0.9.6
     */
    protected Map> settersMap;
    /**
     * The Target class.
     *
     * @since 0.9.6
     */
    protected Class targetClass;
    /**
     * The target type map.
     *
     * @since 0.9.7
     */
    protected boolean targetTypeMap;
    /**
     * The target type set.
     *
     * @since 0.9.7
     */
    protected boolean targetTypeSet;
    /**
     * The Unique key set.
     *
     * @since 0.9.7
     */
    protected Set uniqueKeySet;

    /**
     * Instantiates a new Class descriptor.
     *
     * @param proxyMode   the proxy mode
     * @param targetClass the target class
     * @since 1.1.7
     */
    public ClassDescriptor(V8ProxyMode proxyMode, Class targetClass) {
        applyFunctions = new ArrayList<>();
        constructors = new ArrayList<>();
        fieldMap = new LinkedHashMap<>();
        genericGetters = new ArrayList<>();
        genericSetters = new ArrayList<>();
        gettersMap = new LinkedHashMap<>();
        methodsMap = new LinkedHashMap<>();
        this.proxyMode = proxyMode;
        settersMap = new LinkedHashMap<>();
        this.targetClass = targetClass;
        targetTypeMap = Map.class.isAssignableFrom(targetClass);
        targetTypeSet = Set.class.isAssignableFrom(targetClass);
        uniqueKeySet = new LinkedHashSet<>();
    }

    /**
     * Gets apply functions.
     *
     * @return the apply functions
     * @since 1.1.7
     */
    public List getApplyFunctions() {
        return applyFunctions;
    }

    /**
     * Gets constructors.
     *
     * @return the constructors
     * @since 1.1.7
     */
    public List> getConstructors() {
        return constructors;
    }

    /**
     * Gets conversion mode.
     *
     * @return the conversion mode
     * @since 1.1.7
     */
    public V8ConversionMode getConversionMode() {
        return getTargetClass().isAnnotationPresent(V8Convert.class)
                ? getTargetClass().getAnnotation(V8Convert.class).mode()
                : V8ConversionMode.Transparent;
    }

    /**
     * Gets field map.
     *
     * @return the field map
     * @since 1.1.7
     */
    public Map getFieldMap() {
        return fieldMap;
    }

    /**
     * Gets generic getters.
     *
     * @return the generic getters
     * @since 1.1.7
     */
    public List getGenericGetters() {
        return genericGetters;
    }

    /**
     * Gets generic setters.
     *
     * @return the generic setters
     * @since 1.1.7
     */
    public List getGenericSetters() {
        return genericSetters;
    }

    /**
     * Gets getters map.
     *
     * @return the getters map
     * @since 1.1.7
     */
    public Map> getGettersMap() {
        return gettersMap;
    }

    /**
     * Gets methods map.
     *
     * @return the methods map
     * @since 1.1.7
     */
    public Map> getMethodsMap() {
        return methodsMap;
    }

    /**
     * Gets proxy mode.
     *
     * @return the proxy mode
     * @since 1.1.7
     */
    public V8ProxyMode getProxyMode() {
        return proxyMode;
    }

    /**
     * Gets setters map.
     *
     * @return the setters map
     * @since 1.1.7
     */
    public Map> getSettersMap() {
        return settersMap;
    }

    /**
     * Gets target class.
     *
     * @return the target class
     * @since 1.1.7
     */
    public Class getTargetClass() {
        return targetClass;
    }

    /**
     * Gets unique key set.
     *
     * @return the unique key set
     * @since 1.1.7
     */
    public Set getUniqueKeySet() {
        return uniqueKeySet;
    }

    /**
     * Is target type map.
     *
     * @return true: is a map, false: is not a map
     * @since 1.1.7
     */
    public boolean isTargetTypeMap() {
        return targetTypeMap;
    }

    /**
     * Is target type set.
     *
     * @return true: is a set, false: is not a set
     * @since 1.1.7
     */
    public boolean isTargetTypeSet() {
        return targetTypeSet;
    }
}