java - 如何使用树格式计算差异

Question

嗨，我想像这样显示差异，我想知道 Javers 的最佳方法是什么:

a.name          leftV <-> rightB
a.b[0].value    leftV <-> rightB
a.b[0].c.foo    leftV <-> rightB

举个例子:

public class A {
    public A(String name, List<B> listOfB) {
        this.name = name;
        this.listOfB = listOfB;
    }

    String name;
    List<B> listOfB = new ArrayList<>();
}

public class B {
    public B(int id, String value, C c) {
        this.id = id;
        this.value = value;
        this.c = c;
    }

    @Id
    int id;
    String value;
    C c;
}

public class C {
    public C(String address) {
        this.address = address;
    }

    String address;
}

...
public void printGrpah() {
A a1 = new A("Foo", Arrays.asList(new B(1, "Bar", new C("Paris")), 
                                  new B(2, "Other", new C("Madrid"))));
A a2 =new A("Fooo", Arrays.asList(new B(1, "Bar2", new C("London"))));

我想要得到这样的东西:

Updated:
    name                 Foo <-> Fooo
    listOfB[0].value     Bar <-> Bar2
    listOfB[0].c.address Paris <-> London

Added
    listOfB[1].value     Other
    listOfB[1].c.address Madrid

我不是在寻找最终的解决方案，而是寻找更多线索来了解我需要在哪里插入代码:

• 我需要实现自己的访问者
• 加上自定义 ChangeProcessor
• ...

提前致谢。

克里斯托夫

Answer 1

ChangeProcessor 专为此类任务而设计。请参阅http://javers.org/javadoc_2.0/org/javers/core/Javers.html#processChangeList-java.util.List-org.javers.core.changelog.ChangeProcessor-

例如，要获取简单的更改日志，请调用:

 List<Change> changes = javers.calculateDiffs(...);
 String changeLog = javers.processChangeList(changes, new SimpleTextChangeLog());
 System.out.println( changeLog );