https://github.com/shoyu666/angen

annotion process & code gen demo
https://github.com/shoyu666/angen

Last synced: 25 days ago
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annotion process & code gen demo

• Host: GitHub
• URL: https://github.com/shoyu666/angen
• Owner: shoyu666
• Created: 2019-06-01T11:18:11.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2021-06-04T22:00:05.000Z (over 3 years ago)
• Last Synced: 2023-11-08T08:57:26.563Z (almost 1 year ago)
• Language: Java
• Size: 22.5 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 2
• Metadata Files:
  • Readme: README.md

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README

        
# Java Annotation Processor  Demo

```java

@Builder

public interface Person {

    @NotNull(message = "name should not be null")

    String name();

    @NotNull(message = "age should not be null")

    int age();

    @NotNull(message = "male should not be null")

    boolean male();

    List books();

}

```

生成

```java

//  This codes are generated automatically. Do not modify!

package com.xining.annotation;

import com.xining.sample2.Book;

import java.lang.IllegalAccessException;

import java.lang.NoSuchFieldException;

import java.lang.Object;

import java.lang.Override;

import java.lang.String;

import java.lang.reflect.Field;

import java.lang.reflect.InvocationHandler;

import java.lang.reflect.Method;

import java.util.HashMap;

import java.util.List;

import javax.validation.constraints.NotNull;

public class PersonBuilder implements InvocationHandler {

  private HashMap fieldMap = new HashMap();

  @NotNull(

      message = "name should not be null"

  )

  private String name;

  @NotNull(

      message = "age should not be null"

  )

  private int age;

  @NotNull(

      message = "male should not be null"

  )

  private boolean male;

  private List books;

  private PersonBuilder() {

  }

  public static PersonBuilder of() {

    return new PersonBuilder();

  }

  public static PersonBuilder of(Person t) {

    return new PersonBuilder().name(t.name()).age(t.age()).male(t.male()).books(t.books());

  }

  @Override

  public Object invoke(Object proxy, Method method, Object[] args) throws NoSuchFieldException, IllegalAccessException {

    String methodName = method.getName();

    Object value = fieldMap.get(methodName);

    if(value == null) {

      Field field = this.getClass().getDeclaredField(methodName);

      field.setAccessible(true);

      fieldMap.put(methodName, value = field.get(this));

    }

    return value;

  }

  PersonBuilder name(String name) {

    this.name = name;

    return this;

  }

  PersonBuilder age(int age) {

    this.age = age;

    return this;

  }

  PersonBuilder male(boolean male) {

    this.male = male;

    return this;

  }

  PersonBuilder books(List books) {

    this.books = books;

    return this;

  }

  Person build() {

    ValidatorUtil.validate(this);

    return ProxyUtil.proxy(this,Person.class);

  }

}

```