package org.kuali.rice.krad.datadictionary.validation.constraint;
   
   import javax.xml.bind.annotation.XmlAccessType;
   import javax.xml.bind.annotation.XmlAccessorType;
   import javax.xml.bind.annotation.XmlElement;
   import java.util.List;
   
   /**
    * Must occur constraints are constraints that indicate some range of acceptable valid results. So a must occur constraint
   * might indicate that between 1 and 3 prequisite constraints must be valid. For example, on a person object, it might be
   * that one of three fields must be filled in:
   * 
   * 1. username
   * 2. email
   * 3. phone number
   * 
   * By imposing a must occur constraint on the person object iself, and setting three prequisite constraints below it, with a min of 1 
   * and a max of 3, this requirement can be enforced. 
   * 
   * A more complicated example might be that a US address is only valid if it provides either:
   * (a) a city and state, or
   * (b) a postal code
   * 
   * To enforce this, a single must occur constraint would have two children: (1) a prequisite constraint on postal code, and (2) a must occur constraint
   * with two child prequisite constraints, on city and state, respectively. By setting min=1/max=2 at the top must occur constraint, 
   * and min=2/max=2 at the leaf constraint, this requirement can be enforced.
   * 
   * @author Kuali Rice Team (rice.collab@kuali.org)
   * @since 1.1
   */
  @XmlAccessorType(XmlAccessType.FIELD)
  public class MustOccurConstraint extends BaseConstraint {
  	
      @XmlElement
      private List<PrerequisiteConstraint> prerequisiteConstraints;
  	@XmlElement
      private List<MustOccurConstraint> mustOccurConstraints;
  	@XmlElement
  	private Integer min;
  	@XmlElement
  	private Integer max;
  
  	public List<PrerequisiteConstraint> getPrerequisiteConstraints() {
  		return prerequisiteConstraints;
  	}
  
  	public void setPrerequisiteConstraints(List<PrerequisiteConstraint> prerequisiteConstraints) {
  		this.prerequisiteConstraints = prerequisiteConstraints;
  	}
  
  	public List<MustOccurConstraint> getMustOccurConstraints() {
  		return mustOccurConstraints;
  	}
  
  	public void setMustOccurConstraints(List<MustOccurConstraint> occurs) {
  		this.mustOccurConstraints = occurs;
  	}
  
  	public Integer getMin() {
  		return min;
  	}
  
  	public void setMin(Integer min) {
  		this.min = min;
  	}
  
  	public Integer getMax() {
  		return max;
  	}
  
  	public void setMax(Integer max) {
  		this.max = max;
  	}
  }