https://github.com/teslacn/object-mapper

基于JSR-269的对象转换器
https://github.com/teslacn/object-mapper
Last synced: 3 months ago
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基于JSR-269的对象转换器
Host: GitHub
URL: https://github.com/teslacn/object-mapper
Owner: TeslaCN
License: mit
Created: 2019-10-22T05:03:24.000Z (over 5 years ago)
Default Branch: master
Last Pushed: 2019-10-28T03:41:50.000Z (over 5 years ago)
Last Synced: 2025-01-19T08:30:29.065Z (5 months ago)
Language: Java
Size: 16.6 KB
Stars: 0
Watchers: 2
Forks: 0
Open Issues: 1
Metadata Files:
- Readme: README.md
- License: LICENSE
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README

        # 基于JSR-269的对象转换器

### 实现进度

1. [x] 生成内部类并在内部类生成Getter, Setter，外部对象只暴露业务方法  

2. [x] 两个对象通过注解确认映射关系  

    * 目前只能映射属性值完全相同的对象，自定义映射后续实现

    * 编译时不明原因报错暂时不支持非public类，尚未排查到原因，Javac的报错实在难以排查，错误堆栈见[附录](#附录)

3. [ ] 为存在映射关系的对象生成转换方法

### 使用方法

1. 准备需要转换的对象

#### Person.java

```java

package vip.wuweijie.test.demo;

import vip.wuweijie.wheel.objectmapper.InnerData;

import vip.wuweijie.wheel.objectmapper.MapTo;

import java.util.StringJoiner;

@InnerData

@MapTo({"vip.wuweijie.test.demo.PersonPo"})

public class Person {

    private Long id;

    private String name;

    private int age;

    private String demo;

    public Person() {

    }

    public Person(Long id, String name, int age, String demo) {

        this.id = id;

        this.name = name;

        this.age = age;

        this.demo = demo;

    }

    @Override

    public String toString() {

        return new StringJoiner(", ", Person.class.getSimpleName() + "[", "]")

                .add("id=" + id)

                .add("name='" + name + "'")

                .add("age=" + age)

                .add("demo='" + demo + "'")

                .toString();

    }

}

```

#### PersonPo.java

```java

package vip.wuweijie.test.demo;

import vip.wuweijie.wheel.objectmapper.InnerData;

import java.util.StringJoiner;

@InnerData

public class PersonPo {

    private Long id;

    private String name;

    private int age;

    private String demo;

    @Override

    public String toString() {

        return new StringJoiner(", ", PersonPo.class.getSimpleName() + "[", "]")

                .add("id=" + id)

                .add("name='" + name + "'")

                .add("age=" + age)

                .add("demo='" + demo + "'")

                .toString();

    }

}

```

2. 定义转换器方法签名，方法体随意定义，编译时方法体内的代码会被覆盖

#### PersonMapper.java

```java

package vip.wuweijie.test.demo;

import vip.wuweijie.wheel.objectmapper.InnerData;

import vip.wuweijie.wheel.objectmapper.Mapper;

public class PersonMapper {

    @Mapper

    public static PersonPo toPo(Person person) {

        throw new UnsupportedOperationException();

    }

    public static void main(String[] args) {

        Person person = new Person(23333L, "TESLA_CN", 22, "hello, demo");

        System.out.println(person);

        System.out.println(toPo(person));

    }

}

```

3. 编译时加入本项目中的注解处理器，运行代码

输出结果

```

Person[id=23333, name='TESLA_CN', age=22, demo='hello, demo']

PersonPo[id=23333, name='TESLA_CN', age=22, demo='hello, demo']

```

### 附录

#### 当前未解决问题

* 编译时不明原因报错，错误出现在注解处理器已完成注解后。Debug排查语法树对应的代码，没有语法问题，代码直接放入一个文件也可以使用。

```

[语法分析开始时间 SimpleFileObject[C:\Users\sia\IdeaProjects\object-mapper\object-mapper-processor\src\main\java\vip\wuweijie\test\demo\Person.java]]

[语法分析已完成, 用时 21 毫秒]

[语法分析开始时间 SimpleFileObject[C:\Users\sia\IdeaProjects\object-mapper\object-mapper-processor\src\main\java\vip\wuweijie\test\demo\PersonPo.java]]

[语法分析已完成, 用时 0 毫秒]

[语法分析开始时间 SimpleFileObject[C:\Users\sia\IdeaProjects\object-mapper\object-mapper-processor\src\main\java\vip\wuweijie\test\demo\PersonMapper.java]]

[语法分析已完成, 用时 1 毫秒]

[语法分析开始时间 SimpleFileObject[C:\Users\sia\IdeaProjects\object-mapper\object-mapper-processor\src\main\java\vip\wuweijie\test\demo\DefaultMain.java]]

[语法分析已完成, 用时 1 毫秒]

[正在加载/modules/jdk.jdeps/module-info.class]

[正在加载/modules/jdk.naming.rmi/module-info.class]

[正在加载/modules/jdk.unsupported.desktop/module-info.class]

[正在加载/modules/jdk.net/module-info.class]

[正在加载/modules/java.logging/module-info.class]

[正在加载/modules/jdk.naming.dns/module-info.class]

[正在加载/modules/java.sql.rowset/module-info.class]

[正在加载/modules/java.desktop/module-info.class]

[正在加载/modules/java.xml/module-info.class]

[正在加载/modules/jdk.hotspot.agent/module-info.class]

[正在加载/modules/java.scripting/module-info.class]

[正在加载/modules/jdk.editpad/module-info.class]

[正在加载/modules/jdk.accessibility/module-info.class]

[正在加载/modules/jdk.security.jgss/module-info.class]

[正在加载/modules/java.instrument/module-info.class]

[正在加载/modules/jdk.management.agent/module-info.class]

[正在加载/modules/java.datatransfer/module-info.class]

[正在加载/modules/jdk.internal.ed/module-info.class]

[正在加载/modules/java.prefs/module-info.class]

[正在加载/modules/jdk.zipfs/module-info.class]

[正在加载/modules/jdk.internal.opt/module-info.class]

[正在加载/modules/jdk.jsobject/module-info.class]

[正在加载/modules/jdk.security.auth/module-info.class]

[正在加载/modules/jdk.jconsole/module-info.class]

[正在加载/modules/jdk.jshell/module-info.class]

[正在加载/modules/jdk.jartool/module-info.class]

[正在加载/modules/jdk.jlink/module-info.class]

[正在加载/modules/jdk.scripting.nashorn.shell/module-info.class]

[正在加载/modules/java.rmi/module-info.class]

[正在加载/modules/java.net.http/module-info.class]

[正在加载/modules/jdk.jstatd/module-info.class]

[正在加载/modules/jdk.crypto.mscapi/module-info.class]

[正在加载/modules/jdk.rmic/module-info.class]

[正在加载/modules/jdk.internal.le/module-info.class]

[正在加载/modules/jdk.management.jfr/module-info.class]

[正在加载/modules/jdk.xml.dom/module-info.class]

[正在加载/modules/java.sql/module-info.class]

[正在加载/modules/jdk.attach/module-info.class]

[正在加载/modules/java.security.jgss/module-info.class]

[正在加载/modules/jdk.charsets/module-info.class]

[正在加载/modules/jdk.jdwp.agent/module-info.class]

[正在加载/modules/jdk.management/module-info.class]

[正在加载/modules/jdk.jfr/module-info.class]

[正在加载/modules/jdk.internal.vm.compiler.management/module-info.class]

[正在加载/modules/jdk.scripting.nashorn/module-info.class]

[正在加载/modules/jdk.javadoc/module-info.class]

[正在加载/modules/jdk.crypto.cryptoki/module-info.class]

[正在加载/modules/java.management/module-info.class]

[正在加载/modules/jdk.crypto.ec/module-info.class]

[正在加载/modules/jdk.dynalink/module-info.class]

[正在加载/modules/java.security.sasl/module-info.class]

[正在加载/modules/java.naming/module-info.class]

[正在加载/modules/jdk.compiler/module-info.class]

[正在加载/modules/jdk.pack/module-info.class]

[正在加载/modules/java.compiler/module-info.class]

[正在加载/modules/jdk.httpserver/module-info.class]

[正在加载/modules/jdk.aot/module-info.class]

[正在加载/modules/jdk.internal.jvmstat/module-info.class]

[正在加载/modules/jdk.internal.vm.ci/module-info.class]

[正在加载/modules/jdk.localedata/module-info.class]

[正在加载/modules/java.transaction.xa/module-info.class]

[正在加载/modules/jdk.sctp/module-info.class]

[正在加载/modules/java.se/module-info.class]

[正在加载/modules/jdk.unsupported/module-info.class]

[正在加载/modules/java.smartcardio/module-info.class]

[正在加载/modules/java.xml.crypto/module-info.class]

[正在加载/modules/java.base/module-info.class]

[正在加载/modules/java.management.rmi/module-info.class]

[正在加载/modules/jdk.jdi/module-info.class]

[正在加载/modules/jdk.internal.vm.compiler/module-info.class]

[正在加载/modules/jdk.jcmd/module-info.class]

[源文件的搜索路径: C:\Users\sia\IdeaProjects\object-mapper\object-mapper-processor\build\classes\java\main,C:\Users\sia\IdeaProjects\object-mapper\object-mapper-annotation\build\classes\java\main]

[类文件的搜索路径: C:\Program Files\Java\jdk-11.0.2\lib\modules,C:\Users\sia\IdeaProjects\object-mapper\object-mapper-processor\build\classes\java\main,C:\Users\sia\IdeaProjects\object-mapper\object-mapper-annotation\build\classes\java\main]

[正在加载C:\Users\sia\IdeaProjects\object-mapper\object-mapper-annotation\build\classes\java\main\vip\wuweijie\wheel\objectmapper\InnerData.class]

[正在加载C:\Users\sia\IdeaProjects\object-mapper\object-mapper-annotation\build\classes\java\main\vip\wuweijie\wheel\objectmapper\MapTo.class]

[正在加载/modules/java.base/java/util/StringJoiner.class]

[正在加载/modules/java.base/java/lang/Object.class]

[正在加载/modules/java.base/java/lang/Long.class]

[正在加载/modules/java.base/java/lang/String.class]

[正在加载C:\Users\sia\IdeaProjects\object-mapper\object-mapper-annotation\build\classes\java\main\vip\wuweijie\wheel\objectmapper\Mapper.class]

[正在加载/modules/java.base/java/lang/Deprecated.class]

[正在加载/modules/java.base/java/lang/annotation/Target.class]

[正在加载/modules/java.base/java/lang/annotation/ElementType.class]

[正在加载/modules/java.base/java/lang/annotation/Retention.class]

[正在加载/modules/java.base/java/lang/annotation/RetentionPolicy.class]

[正在加载/modules/java.base/java/lang/annotation/Annotation.class]

[正在加载/modules/java.base/java/lang/Override.class]

循环 1:

	输入文件: {vip.wuweijie.test.demo.Person, vip.wuweijie.test.demo.PersonPo, vip.wuweijie.test.demo.PersonMapper, vip.wuweijie.test.demo.DefaultMain, vip.wuweijie.test.demo.DefaultPerson, vip.wuweijie.test.demo.DefaultPersonPo}

	注释: [vip.wuweijie.wheel.objectmapper.InnerData, vip.wuweijie.wheel.objectmapper.MapTo, java.lang.Override, vip.wuweijie.wheel.objectmapper.Mapper]

	最后一个循环: false

处理程序vip.wuweijie.wheel.objectmapper.InnerDataProcessor与[/vip.wuweijie.wheel.objectmapper.InnerData]匹配并返回true。

处理程序vip.wuweijie.wheel.objectmapper.ObjectMappingProcessor与[/vip.wuweijie.wheel.objectmapper.MapTo, /vip.wuweijie.wheel.objectmapper.Mapper]匹配并返回true。

注: Inner Class Generated for => vip.wuweijie.test.demo.Person

注: Inner Class Generated for => vip.wuweijie.test.demo.PersonPo

注: Inner Class Generated for => vip.wuweijie.test.demo.PersonMapper

注: Inner Class Generated for => vip.wuweijie.test.demo.DefaultPerson

注: Inner Class Generated for => vip.wuweijie.test.demo.DefaultPersonPo

循环 2:

	输入文件: {}

	注释: []

	最后一个循环: true

[正在检查vip.wuweijie.test.demo.Person]

[正在加载/modules/java.base/java/io/Serializable.class]

[正在加载/modules/java.base/java/lang/AutoCloseable.class]

[正在加载/modules/java.base/java/lang/System.class]

[正在加载/modules/java.base/java/io/PrintStream.class]

[正在加载/modules/java.base/java/lang/Appendable.class]

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[正在加载/modules/java.base/java/io/FilterOutputStream.class]

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[正在加载/modules/java.base/java/io/Flushable.class]

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[正在加载/modules/java.base/java/lang/Short.class]

[正在加载/modules/java.base/java/lang/Float.class]

[正在加载/modules/java.base/java/lang/Integer.class]

[正在加载/modules/java.base/java/lang/Double.class]

[正在加载/modules/java.base/java/lang/Boolean.class]

[正在加载/modules/java.base/java/lang/Void.class]

[正在加载/modules/java.base/java/lang/Class.class]

[正在加载/modules/java.base/java/lang/reflect/GenericDeclaration.class]

[正在加载/modules/java.base/java/lang/reflect/AnnotatedElement.class]

[正在加载/modules/java.base/java/lang/reflect/Type.class]

[已写入C:\Users\sia\IdeaProjects\object-mapper\object-mapper-processor\out\production\classes\vip\wuweijie\test\demo\Person$__Person__Inner.class]

[正在加载/modules/java.base/java/lang/invoke/StringConcatFactory.class]

[正在加载/modules/java.base/java/lang/invoke/MethodHandles.class]

[正在加载/modules/java.base/java/lang/invoke/MethodHandles$Lookup.class]

[正在加载/modules/java.base/java/lang/invoke/MethodType.class]

[正在加载/modules/java.base/java/lang/invoke/CallSite.class]

[已写入C:\Users\sia\IdeaProjects\object-mapper\object-mapper-processor\out\production\classes\vip\wuweijie\test\demo\Person.class]

[正在检查vip.wuweijie.test.demo.PersonPo]

[已写入C:\Users\sia\IdeaProjects\object-mapper\object-mapper-processor\out\production\classes\vip\wuweijie\test\demo\PersonPo$__PersonPo__Inner.class]

[已写入C:\Users\sia\IdeaProjects\object-mapper\object-mapper-processor\out\production\classes\vip\wuweijie\test\demo\PersonPo.class]

[正在检查vip.wuweijie.test.demo.PersonMapper]

[正在加载/modules/java.base/java/lang/Number.class]

[已写入C:\Users\sia\IdeaProjects\object-mapper\object-mapper-processor\out\production\classes\vip\wuweijie\test\demo\PersonMapper$__PersonMapper__Inner.class]

[正在加载/modules/java.base/java/util/Objects.class]

[正在加载/modules/java.base/java/util/function/Supplier.class]

[已写入C:\Users\sia\IdeaProjects\object-mapper\object-mapper-processor\out\production\classes\vip\wuweijie\test\demo\PersonMapper.class]

[正在检查vip.wuweijie.test.demo.DefaultMain]

[已写入C:\Users\sia\IdeaProjects\object-mapper\object-mapper-processor\out\production\classes\vip\wuweijie\test\demo\DefaultMain.class]

[正在检查vip.wuweijie.test.demo.DefaultPerson]

[共 458 毫秒]

编译器 (11.0.2) 中出现异常错误。如果在 Bug Database (http://bugs.java.com) 中没有找到该错误, 请通过 Java Bug 报告页 (http://bugreport.java.com) 建立该 Java 编译器 Bug。请在报告中附上您的程序和以下诊断信息。谢谢。

java.lang.AssertionError

	at jdk.compiler/com.sun.tools.javac.util.Assert.error(Assert.java:155)

	at jdk.compiler/com.sun.tools.javac.util.Assert.check(Assert.java:46)

	at jdk.compiler/com.sun.tools.javac.util.Bits.incl(Bits.java:186)

	at jdk.compiler/com.sun.tools.javac.comp.Flow$AssignAnalyzer.initParam(Flow.java:1933)

	at jdk.compiler/com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitMethodDef(Flow.java:1882)

	at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:866)

	at jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)

	at jdk.compiler/com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:398)

	at jdk.compiler/com.sun.tools.javac.comp.Flow$AssignAnalyzer.scan(Flow.java:1453)

	at jdk.compiler/com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitClassDef(Flow.java:1824)

	at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:774)

	at jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)

	at jdk.compiler/com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:398)

	at jdk.compiler/com.sun.tools.javac.comp.Flow$AssignAnalyzer.scan(Flow.java:1453)

	at jdk.compiler/com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitClassDef(Flow.java:1817)

	at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:774)

	at jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)

	at jdk.compiler/com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:398)

	at jdk.compiler/com.sun.tools.javac.comp.Flow$AssignAnalyzer.scan(Flow.java:1453)

	at jdk.compiler/com.sun.tools.javac.comp.Flow$AssignAnalyzer.analyzeTree(Flow.java:2510)

	at jdk.compiler/com.sun.tools.javac.comp.Flow$AssignAnalyzer.analyzeTree(Flow.java:2493)

	at jdk.compiler/com.sun.tools.javac.comp.Flow.analyzeTree(Flow.java:217)

	at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1401)

	at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1375)

	at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:973)

	at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:311)

	at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:170)

	at jdk.compiler/com.sun.tools.javac.Main.compile(Main.java:57)

	at jdk.compiler/com.sun.tools.javac.Main.main(Main.java:43)

```
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