content: /* 
   * Kodkod -- Copyright (c) 2005-present, Emina Torlak
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  package kodkod.ast;
  
  import kodkod.ast.visitor.ReturnVisitor;
  import kodkod.ast.visitor.VoidVisitor;
  
  /**
   * An int expression whose value depends on the truth of a condition.
   * 
   * @specfield condition: Formula
   * @specfield thenExpr: IntExpression
   * @specfield elseExpr: IntExpression
   * @invariant children = 0->condition + 1->thenExpr + 2->elseExpr
   * @author Emina Torlak
   */
  public final class IfIntExpression extends IntExpression {
  	private final Formula condition;
  	private final IntExpression thenExpr, elseExpr;
  
  	/**
  	 * @ensures this.condition' = condition && this.thenExpr' = thenExpr &&
  	 *          this.elseExpr' = elseExpr
  	 */
  	IfIntExpression(Formula condition, IntExpression thenExpr,
  			IntExpression elseExpr) {
  		this.condition = condition;
  		this.thenExpr = thenExpr;
  		this.elseExpr = elseExpr;
  	}
  
  	/**
  	 * Returns the if-condition.
  	 * @return this.condition
  	 */
  	public Formula condition() {
  		return condition;
  	}
  
  	/**
  	 * Returns the then-expression.
  	 * @return this.thenExpr
  	 */
  	public IntExpression thenExpr() {
  		return thenExpr;
  	}
  
  	/**
  	 * Returns the else-expression.
  	 * @return this.elseExpr
  	 */
  	public IntExpression elseExpr() {
  		return elseExpr;
  	}
  
  	/**
  	 * {@inheritDoc}
  	 * @see kodkod.ast.IntExpression#accept(kodkod.ast.visitor.ReturnVisitor)
  	 */
  	@Override
  	public <E, F, D, I> I accept(ReturnVisitor<E, F, D, I> visitor) {
  		return visitor.visit(this);
  	}
  
  	/**
  	 * {@inheritDoc}
  	 * @see kodkod.ast.IntExpression#accept(kodkod.ast.visitor.VoidVisitor)
  	 */
  	@Override
  	public void accept(VoidVisitor visitor) {
  		visitor.visit(this);
  	}
  	
  	/**
  	 * {@inheritDoc}
  	 * @see kodkod.ast.Node#toString()
  	 */
  	public String toString() {
  		return "(if " + condition + " then " + thenExpr + " else " + elseExpr + ")";
  	}
  
  }
  