historyentry.java

用struts2＋jpa来实现了对音乐

package net.jeffrey.hibernate.history;

import java.io.Serializable;
import java.text.DateFormat;
import java.util.Date;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Enumerated;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import net.jeffrey.hibernate.AbstractEntity;

/**
 * 操作日志的条目
 * @author jeffrey
 */
@Entity
@NamedQueries({
    // 命名查询，根据实体查询与其关联的审计日志记录，注意这里审计日志和被审计实体并没有物理关联（数据库约束），即使实体被删除，仍然可以根据实体id访问审计日志。
    @NamedQuery(name = "HistoryEntry.findByEntity", query = "select h from HistoryEntry h where entity = :entity and entityId = :entityId order by timestamp asc")
})
public class HistoryEntry extends AbstractEntity implements Serializable {
    private static final long serialVersionUID = 9025279546306024660L;
    
    /* 操作的时间 */
    @Temporal(TemporalType.TIMESTAMP)
    @Column(name = "hs_timestamp")
    private Date timestamp;
    
    /* 操作的类型（枚举型：新建、更新、删除） */
    @Enumerated(javax.persistence.EnumType.STRING)
    private OperationType operationType;
    
    /* 被操作的实体类型 */
    private Class entity;
    
    /* 被操作实体的主键id */
    @Column(name = "entity_id")
    private Integer entityId;
    
    /* 操作描述 */
    private String description;
    
    /* 被操作的属性 */
    private String property;
    
    /* 操作前的值 */
    private String previousValue;
    
    /* 更新值 */
    private String newValue;

    public HistoryEntry() {
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public Class getEntity() {
        return entity;
    }

    public void setEntity(Class entity) {
        this.entity = entity;
    }

    public Integer getEntityId() {
        return entityId;
    }

    public void setEntityId(Integer entityId) {
        this.entityId = entityId;
    }

    public String getNewValue() {
        return newValue;
    }

    public void setNewValue(String newValue) {
        this.newValue = newValue;
    }

    public OperationType getOperationType() {
        return operationType;
    }

    public void setOperationType(OperationType operationType) {
        this.operationType = operationType;
    }

    public String getPreviousValue() {
        return previousValue;
    }

    public void setPreviousValue(String previousValue) {
        this.previousValue = previousValue;
    }

    public String getProperty() {
        return property;
    }

    public void setProperty(String property) {
        this.property = property;
    }

    public Date getTimestamp() {
        return timestamp;
    }

    public void setTimestamp(Date timestamp) {
        this.timestamp = timestamp;
    }
    
    public void setHistorizableEntity(Historizable entity) {
        this.setEntity(entity.getClass());
        this.setEntityId(entity.getId());
        this.setDescription(entity.toString());
    }
    
    @Override
    public String toString() {
        return "History[" + DateFormat.getDateTimeInstance().format(timestamp) + ", " + operationType + ", " + entity.getSimpleName() + "," + id + " " + property + "]";
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final HistoryEntry other = (HistoryEntry) obj;
        return this.getId().equals(other.getId());
    }

    @Override
    public int hashCode() {
        int hash = 5;
        hash = 47 * hash + id;
        return hash;
    }
}