java - jaxb @XmlIDREF @XmlID 工作惊人

Question

jaxb @XmlIDREF @XmlID 工作惊人

我的 xml 输入是

<dept>
    <courses>
        <course id="1" units="4" level="UNDERGRAD" name="Fundamentals of Programming"/>
        <course id="2" units="3" level="UNDERGRAD" name="Advanced Programming">
            <pre>1</pre>
        </course>
        <course id="3" units="3" level="UNDERGRAD" name="Discrete Mathematics">
            <pre>1</pre>
        </course>
        <course id="4" units="3" level="UNDERGRAD" name="Data Structures"/>
        <course id="5" units="3" level="UNDERGRAD" name="Database Systems">
            <pre>4</pre>
            <pre>2</pre>
        </course>
        <course id="6" units="3" level="UNDERGRAD" name="Internet Engineering">
            <pre>4</pre>
            <pre>2</pre>
            <co>5</co>
        </course>
        <course id="7" units="3" level="GRAD" name="Formal Methods"/>
        <course id="8" units="3" level="GRAD" name="Advanced Networks"/>
        <course id="9" units="3" level="UNDERGRAD" name="Fundamentals of Management"/>
        <course id="10" units="3" level="UNDERGRAD" name="Fundamentals of IT"/>
        <course id="11" units="3" level="UNDERGRAD" name="Multimedia"/>
        <course id="12" units="3" level="UNDERGRAD" name="Network Security"/>
        <course id="13" units="3" level="UNDERGRAD" name="Elearning"/>
    </courses>
    <profs>
        <prof firstName="Ramtin" id="1"/>
        <prof firstName="Ahmad" id="2"/>
        <prof firstName="Hesham" id="3"/>
        <prof firstName="Fatemeh" id="4"/>
        <prof firstName="Mahmood" id="5"/>
        <prof firstName="Mahmoudreza" id="6"/>
        <prof firstName="Fattaneh" id="7"/>
        <prof firstName="Azadeh" id="8"/>
        <prof firstName="Siamak" id="9"/>
    </profs>
    <terms>
        <term id="1">
            <offering id="1" prof="6" course="1" section="1" time="1" capacity="10"/>
            <offering id="2" prof="1" course="2" section="1" time="1" capacity="10"/>
            <offering id="3" prof="9" course="3" section="1" time="2" capacity="10"/>
            <offering id="4" prof="3" course="4" section="1" time="3" capacity="10"/>
            <offering id="5" prof="1" course="7" section="1" time="6" capacity="10"/>
        </term>
        <term>
            <offering id="6" prof="1" course="2" section="1" time="5" capacity="10"/>
            <offering id="7" prof="9" course="3" section="1" time="6" capacity="10"/>
            <offering id="8" prof="4" course="8" section="1" time="6" capacity="10"/>
            <offering id="9" prof="2" course="1" section="1" time="1" capacity="10"/>
        </term>
    </terms>
    <students>
        <student firstName="Gholam" lastName="Patoobaf" program="1" id="810190420">
            <studyrec grade="9.0" offering="1" status="FAILED"/>
            <studyrec grade="0.0" offering="9" status="INPROGRESS"/>
        </student>
        <student firstName="Ghamar" lastName="Aghrabparast" program="1" id="810190421">
            <studyrec grade="16.0" offering="1" status="PASSED"/>
            <studyrec grade="0.0" offering="6" status="INPROGRESS"/>
            <studyrec grade="0.0" offering="7" status="INPROGRESS"/>
        </student>
    </students>
</dept>

---

我的元素 java 类:offering

import javax.xml.bind.annotation.*;

@XmlAccessorType(XmlAccessType.FIELD)
public class Offering {
    @XmlAttribute
    @XmlID
    private String id;
    @XmlAttribute
    @XmlIDREF
    private Prof prof;
    @XmlAttribute
    @XmlIDREF
    private Course course;
    @XmlAttribute
    private String section;
    @XmlAttribute
    private String time;
    @XmlAttribute
    private int capacity;

    public void setCapacity(int capacity) {
        this.capacity = capacity;
    }

    public int getCapacity() {
        return capacity;
    }

    public void setCourse(Course course) {
        this.course = course;
    }

    public Course getCourse() {
        return course;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getId() {
        return id;
    }

    public void setProf(Prof prof) {
        this.prof = prof;
    }

    public Prof getProf() {
        return prof;
    }

    public void setSection(String section) {
        this.section = section;
    }

    public String getSection() {
        return section;
    }

    public void setTime(String time) {
        this.time = time;
    }

    public String getTime() {
        return time;
    }    

    @Override
    public boolean equals(Object t) {
        if (t instanceof Offering) {
            if(((Offering)t).getId().equals(this.id)) {
                return true;
            }
        }
        return false;
    }

}

---

我的元素 java 类:Prof

import javax.xml.bind.annotation.*;
@XmlAccessorType(XmlAccessType.FIELD)
public class Prof {
    @XmlAttribute
    private String firstName;   
    @XmlAttribute
    @XmlID
    private String id;

    public void setId(String id) {
        this.id = id;
    }

    public void setFirstname(String firstname) {
        this.firstName = firstname;
    }

    public String getFirstname() {
        return firstName;
    }

    public String getId() {
        return id;
    }

}

---

所以如果我简单地加载输入文件并将其保存到另一个文件我惊奇地看到这个:在提供 prof id 小于 6 的元素时，prog 属性不显示并且在 java 上下文中为 null但是 prof id 为 6 或更多的产品正确地具有 prof 属性

此事件也发生在既定类(class)的类(class)属性上，但针对的是 9 而不是 6正如您在下面看到我的部分输出:

...
 <offering id="1" prof="6" section="1" time="1" capacity="10"/>
 <offering id="2" section="1" time="1" capacity="10"/>
 <offering id="3" prof="9" section="1" time="2" capacity="10"/>
 <offering id="4" section="1" time="3" capacity="10"/>
 <offering id="5" section="1" time="6" capacity="10"/>
...

它没有规则，例如 jaxb 适用于此输入 xml，而不仅仅是 id 大于 6:

<offering id="1" prof="3" course="1" section="1" time="1" capacity="10"/>
<offering id="2" prof="3" course="2" section="1" time="1" capacity="10"/>
<offering id="3" prof="9" course="3" section="1" time="2" capacity="10"/>
<offering id="4" prof="8" course="4" section="1" time="3" capacity="10"/>
<offering id="5" prof="6" course="7" section="1" time="6" capacity="10"/>

Answer 1

我的问题通过实现 IDResolver 解决了