package it.serendigity.maven.plugin.lifecycle.helper.vo;
   
   import java.io.Serializable;
   import java.util.Comparator;
   import java.util.EnumSet;
   import java.util.Set;
   
   import org.apache.commons.lang3.builder.CompareToBuilder;
   
  /**
   * Order a {@link MavenExecutionInfo} by {@link MavenExecutionAttribute}
   *
   */
  @SuppressWarnings("serial")
  public class MavenExecutionComparator implements Comparator<MavenExecutionInfo>, Serializable {
  
  	private final MavenExecutionAttribute orderAttribute;
  
  	public MavenExecutionComparator( MavenExecutionAttribute orderAttribute ) {
  		this.orderAttribute = orderAttribute;
  	}
  
  	@Override
  	public int compare( MavenExecutionInfo o1, MavenExecutionInfo o2 ) {
  
  		MavenExecutionAttribute orderAttr = getOrderAttribute();
  
  		CompareToBuilder builder = new CompareToBuilder();
  
  		Set<MavenExecutionAttribute> excludes = EnumSet.noneOf( MavenExecutionAttribute.class );
  
  		// Order by orderAttribute
  		if ( orderAttr != null ) {
  			builder.append( o1.getValue( orderAttr ), o2.getValue( orderAttr ) );
  			excludes.add( orderAttr );
  		}
  
  		// Always second order with ExecutionOrder to preserve execution plan order
  		if ( orderAttr == null || orderAttr != MavenExecutionAttribute.PLAN_ORDER ) {
  			builder.append( o1.getExecutionOrder(), o2.getExecutionOrder() );
  			excludes.add( MavenExecutionAttribute.PLAN_ORDER );
  		}
  		MavenExecutionAttribute[] excludesArray = excludes.toArray( new MavenExecutionAttribute[excludes.size()] );
  
  		// Add other fields
  		Set<MavenExecutionAttribute> complementOf = MavenExecutionAttribute.complementOf( excludesArray );
  
  		if ( complementOf != null && !complementOf.isEmpty() ) {
  			complementOf.stream().forEach( p -> builder.append( o1.getValue( p ), o2.getValue( p ) ) );
  
  		}
  
  		return builder.toComparison();
  
  	}
  
  	protected MavenExecutionAttribute getOrderAttribute() {
  		return orderAttribute;
  	}
  
  }