Post.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2020 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
package org.turro.elephant.entities.db;
 
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.List;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Index;
import javax.persistence.Lob;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
import javax.persistence.Temporal;
import org.turro.string.Strings;
import org.turro.action.Contacts;
import org.turro.assistant.ParticipationInfo;
import org.turro.auth.Authentication;
import org.turro.elephant.db.ElephantPU;
import org.turro.elephant.db.WhereClause;
import org.turro.entities.ITreeEntity;
import org.turro.entities.IUniquePath;
import org.turro.jpa.Dao;
import org.turro.participation.ParticipationReason;
import org.turro.plugin.contacts.IContact;
 
@Entity
@Table(indexes={ 
  @Index(name = "UniquePath", columnList = "uniquePath") 
})
public class Post implements java.io.Serializable, IUniquePath, ITreeEntity {
 
  @Id
  @GeneratedValue(strategy=GenerationType.IDENTITY)
  @Column(name="IDENTIFIER")
  private Long id;
  
  @ManyToOne
  private Topic topic;
  
  @ManyToOne
  private Post parent;
  
  private String uniquePath;
  
  private String authorId;
  
  @Temporal(value = javax.persistence.TemporalType.TIMESTAMP)
  private java.util.Date creation;
  
  @Lob
  @Column(length=4096)
  private String text;
 
  public Long getId() {
    return id;
  }
 
  public void setId(Long id) {
    this.id = id;
  }
 
  public Topic getTopic() {
    return topic;
  }
 
  public void setTopic(Topic topic) {
    this.topic = topic;
  }
 
  public Post getParent() {
    return parent;
  }
 
  public void setParent(Post parent) {
    this.parent = parent;
  }
 
  @Override
  public String getUniquePath() {
    return uniquePath;
  }
 
  public void setUniquePath(String uniquePath) {
    this.uniquePath = uniquePath;
  }
 
  public String getAuthorId() {
    return authorId;
  }
 
  public void setAuthorId(String authorId) {
    this.authorId = authorId;
  }
 
  public Date getCreation() {
    return creation;
  }
 
  public void setCreation(Date creation) {
    this.creation = creation;
  }
 
  public String getText() {
    return text;
  }
 
  public void setText(String text) {
    this.text = text;
  }
  
  /* Helpers */
  
  public boolean isEmpty() {
    return Strings.isBlank(text) || Strings.isBlank(authorId) ||
            (parent == null && topic == null);
  }
  
  public IUniquePath getCurrentParent() {
    if(parent == null) {
      return topic;
    } else {
      return parent;
    }
  }
  
  public Topic getParentTopic() {
    Post post = this;
    while(post != null && post.getTopic() == null) {
      post = post.getParent();
    }
    return post != null ? post.getTopic() : null;
  }
  
  public List<Post> getPosts() {
    return getPosts(new ElephantPU());
  }
  
  public List<Post> getPosts(Dao dao) {
    WhereClause wc = new WhereClause();
    wc.addClause("select p from Post p");
    wc.addClause("where p.parent = :post");
    wc.addNamedValue("post", this);
    wc.addClause("order by creation");
    return dao.getResultList(wc);
  }
  
  public boolean isSeen() {
    return isSeen(Authentication.getIContact());
  }
  
  public boolean isSeen(IContact contact) {
    return new ParticipationInfo("/post/" + getId(), "/contact/" + contact.getId(), 
            ParticipationReason.REASON_SEEN).isChecked();
  }
  
  public IContact getContact() {
    return Contacts.getContactById(authorId);
  }
 
  boolean isParticipant(IContact contact) {
    if(contact != null && contact.isValid() && contact.getId().equals(authorId)) {
      return true;
    } else {
      for(Post post : getPosts()) {
        if(post.isParticipant(contact)) {
          return true;
        }
      }
    }
    return false;
  }
  
  /* ITreeEntity */
 
  @Override
  public ITreeEntity getEntityParent() {
    return (ITreeEntity) getCurrentParent();
  }
 
  @Override
  public Collection<ITreeEntity> getEntityChildren() {
    return new ArrayList<>(getPosts());
  }
  
}