bprocessor-commit

[Michael L. <he...@us...>]

Update of /cvsroot/bprocessor/model/src/net/sourceforge/bprocessor/model
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv22935/src/net/sourceforge/bprocessor/model

Added Files:
	Constraints.java 
Log Message:
Constraints contains all constraints and take care of updating

--- NEW FILE: Constraints.java ---
//---------------------------------------------------------------------------------
// $Id: Constraints.java,v 1.1 2006/01/11 13:34:47 henryml Exp $
//
// Copyright (c) 2005      The BProcessor Team (http://bprocessor.sourceforge.net) 
// Released under the Lesser GNU Public License v2.1
//---------------------------------------------------------------------------------

package net.sourceforge.bprocessor.model;

import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;

/**
 * Constraints contains all constraints on the geometry
 */
public class Constraints {
  /** The constraints */
  private Collection constraints;
  
  /** The singular Constraints instance */
  private static Constraints instance = new Constraints();
  
  /**
   * Return the singular instance
   * @return The singular instance
   */
  public static Constraints getInstance() {
    return instance;
  }
  
  /**
   * Constructor for constraints
   */
  public Constraints() {
    constraints = new LinkedList();
  }
  
  /**
   * Add a constraint
   * @param constraint The constraint to add
   */
  public void add(Constraint constraint) {
    constraints.add(constraint);
  }
  
  /**
   * Remove a constraint
   * @param constraint The constraint to remove
   */
  public void remove(Constraint constraint) {
    constraints.remove(constraint);
  }
  
  /**
   * Update all constraints related to entity
   * @param entity The changed entity
   */
  public void update(Entity entity) {
    // TODO implement general constraint updating mechanism
    // that ensures that constraints are updated in correct
    // order
    
    Iterator iter = constraints.iterator();
    while (iter.hasNext()) {
      Constraint current = (Constraint) iter.next();
      if (current.depends(entity)) {
        current.update(entity);
      }
    }
    entity.changed();
  }
}