com.es.plus.adapter.tools.SerializedLambda Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of es-plus-adapter-core Show documentation
es-plus核心
There is a newer version: 0.3.3
/*
 *  from organization baomidou
 *
 * 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.es.plus.adapter.tools;


import com.es.plus.adapter.exception.EsException;
import com.es.plus.adapter.util.ClassUtils;

import java.io.*;
@SuppressWarnings("ALL")
public class SerializedLambda implements Serializable {

    private static final long serialVersionUID = 8025925345765570181L;

    private Class capturingClass;
    private String functionalInterfaceClass;
    private String functionalInterfaceMethodName;
    private String functionalInterfaceMethodSignature;
    private String implClass;
    private String implMethodName;
    private String implMethodSignature;
    private int implMethodKind;
    private String instantiatedMethodType;
    private Object[] capturedArgs;

    /**
     * 通过反序列化转换 lambda 表达式，该方法只能序列化 lambda 表达式，不能序列化接口实现或者正常非 lambda 写法的对象
     * 还有一种方法是反射调用writeReplace方法也能获取到 这是jdk默认的序列化函数式接口的方法
     */
    public static SerializedLambda resolve(SFunction lambda) {
        if (!lambda.getClass().isSynthetic()) {
            throw new EsException("该方法仅能传入 lambda 表达式产生的合成类");
        }
        try (ObjectInputStream objIn = new ObjectInputStream(new ByteArrayInputStream(SerializationUtils.serialize(lambda))) {
            @Override
            protected Class resolveClass(ObjectStreamClass objectStreamClass) throws IOException, ClassNotFoundException {
                Class clazz;
                try {
                    clazz = ClassUtils.toClassConfident(objectStreamClass.getName());
                } catch (Exception ex) {
                    clazz = super.resolveClass(objectStreamClass);
                }
                return clazz == java.lang.invoke.SerializedLambda.class ? SerializedLambda.class : clazz;
            }
        }) {
            return (SerializedLambda) objIn.readObject();
        } catch (ClassNotFoundException | IOException e) {
            throw new EsException("This is impossible to happen", e);
        }
    }

    /**
     * 获取接口 class
     *
     * @return 返回 class 名称
     */
    public String getFunctionalInterfaceClassName() {
        return normalizedName(functionalInterfaceClass);
    }

    /**
     * 获取实现的 class
     *
     * @return 实现类
     */
    public Class getImplClass() {
        return ClassUtils.toClassConfident(getImplClassName());
    }

    /**
     * 获取 class 的名称
     *
     * @return 类名
     */
    public String getImplClassName() {
        return normalizedName(implClass);
    }

    /**
     * 获取实现者的方法名称
     *
     * @return 方法名称
     */
    public String getImplMethodName() {
        return implMethodName;
    }

    /**
     * 正常化类名称，将类名称中的 / 替换为 .
     *
     * @param name 名称
     * @return 正常的类名
     */
    private String normalizedName(String name) {
        return name.replace('/', '.');
    }

    /**
     * @return 获取实例化方法的类型
     */
    public Class getInstantiatedType() {
        String instantiatedTypeName = normalizedName(instantiatedMethodType.substring(2, instantiatedMethodType.indexOf(';')));
        return ClassUtils.toClassConfident(instantiatedTypeName);
    }

    /**
     * @return 字符串形式
     */
    @Override
    public String toString() {
        String interfaceName = getFunctionalInterfaceClassName();
        String implName = getImplClassName();
        return String.format("%s -> %s::%s",
                interfaceName.substring(interfaceName.lastIndexOf('.') + 1),
                implName.substring(implName.lastIndexOf('.') + 1),
                implMethodName);
    }

}