3
的Netbeans給出:配置「不平衡的讀/收藏寫」爲headerFields
聲明:收集僅添加到,從來不看
package net.bounceme.dur.usenet.model;
import java.io.Serializable;
import java.util.AbstractMap.SimpleEntry;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.mail.Header;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.persistence.*;
@Entity
public class Article implements Serializable {
private static final long serialVersionUID = 1L;
private static final Logger LOG = Logger.getLogger(Article.class.getName());
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column
private String subject;
@OneToMany(mappedBy = "article")
private List<HeaderField> headerFields = new ArrayList<>();
public Article() {
}
public Article(Message message) {
try {
subject = message.getSubject();
Enumeration e = message.getAllHeaders();
while (e.hasMoreElements()) {
Header header = (Header) e.nextElement();
@SuppressWarnings("unchecked")
SimpleEntry nameValue = new SimpleEntry(header.getName(), header.getValue());
HeaderField headerField = new HeaderField(nameValue);
headerFields.add(headerField);
}
} catch (MessagingException ex) {
Logger.getLogger(Article.class.getName()).log(Level.SEVERE, null, ex);
}
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@Override
public int hashCode() {
int hash = 0;
hash += (id != null ? id.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Article)) {
return false;
}
Article other = (Article) object;
if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
return false;
}
return true;
}
@Override
public String toString() {
return subject;
}
public String getSubject() {
return subject;
}
public void setSubject(String subject) {
this.subject = subject;
}
}
這讓我懷疑是否HeaderField的關係,正確地從成立Article
,或此警告指示的內容。
這可能是(我沒有使用NetBeans),指的是你的收藏/列表絕對沒用[你可以放棄它沒有副作用](到目前爲止),或者它可能是一個NetBeans報告錯誤。 – 2012-07-31 09:13:29
好的,就像我通常那樣,我問了一個有缺陷的問題。爲什麼headerFields無用?它應該是**應該是headerFieldList中屬於一篇文章的一對多,多個HeaderField。這不是這樣嗎?當然,這只是該關係的文章方面。這是一種建立的關係嗎? – Thufir 2012-07-31 09:16:59
映射應該是有效的,只是這個字段被定義爲私有的,並且沒有公共的方法來訪問它,這可能會導致警告。 (如Marko Topolnik回答) – 2012-07-31 09:26:36