package kernel.bo;
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import java.io.Serializable;
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import java.util.Date;
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import javax.persistence.Column;
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import javax.persistence.Id;
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import org.springframework.util.ClassUtils;
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/**
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* 实体抽象类
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*
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*/
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public class EntityObject implements Serializable {
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private static final long serialVersionUID = -6624393812017741464L;
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@Id
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@Column(name="UUID")
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private Serializable id;
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private int entityVersion;
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private Date timestamp;
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public Serializable getId() {
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return id;
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}
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public void setId(Serializable id) {
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this.id = id;
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}
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public int getEntityVersion() {
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return entityVersion;
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}
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public void setEntityVersion(int entityVersion) {
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this.entityVersion = entityVersion;
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}
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public Date getTimestamp() {
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return timestamp;
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}
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public void setTimestamp(Date timestamp) {
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this.timestamp = timestamp;
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}
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// @Override
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public String toString() {
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return ClassUtils.getShortName(getClass()) + ": id=" + getId();
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}
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/**
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* Attempt to establish identity based on id if both exist. If either id
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* does not exist use Object.equals().
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*
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* @see java.lang.Object#equals(java.lang.Object)
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*/
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public boolean equals(Object other) {
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if (other == this) {
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return true;
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}
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if (other == null) {
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return false;
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}
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if (!(other instanceof EntityObject)) {
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return false;
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}
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// 即便是继承关系，由于数据逻辑存在依赖关系，必须是同class才行
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if(!this.getClass().equals(other.getClass())){
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return false;
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}
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EntityObject entity = (EntityObject) other;
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if (id == null || entity.getId() == null) {
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return false;
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}
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return id.equals(entity.getId());
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}
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/**
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* Use ID if it exists to establish hash code, otherwise fall back to
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* Object.hashCode(). Based on the same information as equals, so if that
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* changes, this will. N.B. this follows the contract of Object.hashCode(),
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* but will cause problems for anyone adding an unsaved {@link Entity} to a
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* Set because Set.contains() will almost certainly return false for the
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* {@link Entity} after it is saved. Spring Batch does not store any of its
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* entities in Sets as a matter of course, so internally this is consistent.
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* Clients should not be exposed to unsaved entities.
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*
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* @see java.lang.Object#hashCode()
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*/
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public int hashCode() {
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if (id == null) {
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return super.hashCode();
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}
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return 39 + 29 * getClass().hashCode() + 87 * id.hashCode();
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}
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}
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