Category.java

package de.dhbw.humbuch.model.entity;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;

/**
 * @author David Vitt
 *
 */
@Entity
@Table(name="category")
public class Category implements de.dhbw.humbuch.model.entity.Entity, Serializable, Comparable<Category> {
	private static final long serialVersionUID = -1497919629033299136L;
	
	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private int id;
	private String name;
	private String description;
	
	@OneToMany(cascade = {CascadeType.PERSIST, CascadeType.MERGE}, mappedBy="category", fetch=FetchType.LAZY)
	private List<TeachingMaterial> teachingMaterials = new ArrayList<>();
	
	/**
	 * Required by Hibernate.<p>
	 * Use the {@link Builder} instead.
	 * 
	 * @see Builder
	 */
	@Deprecated
	public Category() {}

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getDescription() {
		return description;
	}

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

	public List<TeachingMaterial> getTeachingMaterials() {
		return teachingMaterials;
	}

	public void setTeachingMaterials(List<TeachingMaterial> teachingMaterials) {
		this.teachingMaterials = teachingMaterials;
	}

	public static class Builder {
		private final String name;
		
		private String description;
		
		public Builder(String name) {
			this.name = name;
		}
		
		public Builder description(String description) {
			this.description = description;
			return this;
		}
		
		public Category build() {
			return new Category(this);
		}
	}
	
	private Category(Builder builder) {
		this.name = builder.name;
		
		this.description = builder.description;
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + id;
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (!(obj instanceof Category))
			return false;
		Category other = (Category) obj;
		if (getId() != other.getId())
			return false;
		return true;
	}
	
	@Override
	public String toString() {
		return getName();
	}

	@Override
	public int compareTo(Category o) {
		int compareResult = getName().compareTo(o.getName());
		if(compareResult != 0) {
			return compareResult;
		}
		
		return Integer.compare(hashCode(), o.hashCode());
	}
}