Does aggregate function "greatest" work on entity objects?

galandor

Joined on 2013‑08‑01

do not come to the function "compareTo"

@Entity
public class ChatHistoryItem extends AbstractObject implements Comparable {
    private static final long serialVersionUID = 1L;

    @Override
    public int compareTo(Object t) {
        //Logger.getLogger("------------").log(Level.INFO, this.toString() + " compareTo " + t.toString() + " result = " +
        int result = ((int)(this.getCreateDate().getTime() - ((ChatHistoryItem)t).getCreateDate().getTime()));
        //Logger.getLogger("------------").log(Level.INFO, this.toString() + " compareTo " + t.toString() + " result = " + result);
        return result;
    }
   
    @Column(length=1024)
    private String text;
   
    @Embedded
    private PersonData sender;
   
    @Embedded
    private PersonData recipient;
   
    @ElementCollection(targetClass = ChatAttachment.class, fetch = FetchType.EAGER)
    private List<ChatAttachment> attachments;
   
    private boolean isSystem;
   
    private boolean isViewed;
   
    private boolean isPriority;
  
    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

    public PersonData getSender() {
        return sender;
    }

    public void setSender(PersonData sender) {
        this.sender = sender;
    }

    public PersonData getRecipient() {
        return recipient;
    }

    public void setRecipient(PersonData recipient) {
        this.recipient = recipient;
    }
   

    public List<ChatAttachment> getAttachments() {
        return attachments;
    }

    public void setAttachments(List<ChatAttachment> attachments) {
        this.attachments = attachments;
    }

    public boolean getIsSystem() {
        return isSystem;
    }

    public void setIsSystem(boolean isSystem) {
        this.isSystem = isSystem;
    }

    public boolean getIsViewed() {
        return isViewed;
    }

    public void setIsViewed(boolean isViewed) {
        this.isViewed = isViewed;
    }

    public boolean isIsPriority() {
        return isPriority;
    }

    public void setIsPriority(boolean isPriority) {
        this.isPriority = isPriority;
    }

   
   
    @Override
    public String toString() {
        return "granat.dp.domain.entity.DialogItem[ id=" + getId() + " ]";
    }
 
}

Thanks for your help.

support

Joined on 2010‑05‑03

Entity objects are not comparable in queries.

See the list of Comparable Data Types in the manual.

ObjectDB Support

Does aggregate function "greatest" work on entity objects?

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