/*******************************************************************************
 * Copyright (c) 2009-2015 CWI
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   * Jurgen J. Vinju - Jurgen.Vinju@cwi.nl - CWI
 *   * Tijs van der Storm - Tijs.van.der.Storm@cwi.nl
 *   * Paul Klint - Paul.Klint@cwi.nl - CWI
 *   * Mark Hills - Mark.Hills@cwi.nl (CWI)
 *   * Arnold Lankamp - Arnold.Lankamp@cwi.nl
 *   * Michael Steindorfer - Michael.Steindorfer@cwi.nl - CWI
 *******************************************************************************/
package org.rascalmpl.ast;


import org.rascalmpl.value.IConstructor;
import org.rascalmpl.value.ISourceLocation;

public abstract class OptionalExpression extends AbstractAST {
  public OptionalExpression(ISourceLocation src, IConstructor node) {
    super(src /* we forget node on purpose */);
  }

  
  public boolean hasExpression() {
    return false;
  }

  public org.rascalmpl.ast.Expression getExpression() {
    throw new UnsupportedOperationException();
  }

  

  
  public boolean isExpression() {
    return false;
  }

  static public class Expression extends OptionalExpression {
    // Production: sig("Expression",[arg("org.rascalmpl.ast.Expression","expression")],breakable=false)
  
    
    private final org.rascalmpl.ast.Expression expression;
  
    public Expression(ISourceLocation src, IConstructor node , org.rascalmpl.ast.Expression expression) {
      super(src, node);
      
      this.expression = expression;
    }
  
    @Override
    public boolean isExpression() { 
      return true; 
    }
  
    @Override
    public <T> T accept(IASTVisitor<T> visitor) {
      return visitor.visitOptionalExpressionExpression(this);
    }
  
    @Override
    protected void addForLineNumber(int $line, java.util.List<AbstractAST> $result) {
      if (getLocation().getBeginLine() == $line) {
        $result.add(this);
      }
      ISourceLocation $l;
      
      $l = expression.getLocation();
      if ($l.hasLineColumn() && $l.getBeginLine() <= $line && $l.getEndLine() >= $line) {
        expression.addForLineNumber($line, $result);
      }
      if ($l.getBeginLine() > $line) {
        return;
      }
      
    }
  
    @Override
    public boolean equals(Object o) {
      if (!(o instanceof Expression)) {
        return false;
      }        
      Expression tmp = (Expression) o;
      return true && tmp.expression.equals(this.expression) ; 
    }
   
    @Override
    public int hashCode() {
      return 557 + 601 * expression.hashCode() ; 
    } 
  
    
    @Override
    public org.rascalmpl.ast.Expression getExpression() {
      return this.expression;
    }
  
    @Override
    public boolean hasExpression() {
      return true;
    }	
  
    @Override
    public Object clone()  {
      return newInstance(getClass(), src, (IConstructor) null , clone(expression));
    }
            
  }
  public boolean isNoExpression() {
    return false;
  }

  static public class NoExpression extends OptionalExpression {
    // Production: sig("NoExpression",[],breakable=false)
  
    
  
    public NoExpression(ISourceLocation src, IConstructor node ) {
      super(src, node);
      
    }
  
    @Override
    public boolean isNoExpression() { 
      return true; 
    }
  
    @Override
    public <T> T accept(IASTVisitor<T> visitor) {
      return visitor.visitOptionalExpressionNoExpression(this);
    }
  
    @Override
    protected void addForLineNumber(int $line, java.util.List<AbstractAST> $result) {
      if (getLocation().getBeginLine() == $line) {
        $result.add(this);
      }
      ISourceLocation $l;
      
    }
  
    @Override
    public boolean equals(Object o) {
      if (!(o instanceof NoExpression)) {
        return false;
      }        
      NoExpression tmp = (NoExpression) o;
      return true ; 
    }
   
    @Override
    public int hashCode() {
      return 19 ; 
    } 
  
    	
  
    @Override
    public Object clone()  {
      return newInstance(getClass(), src, (IConstructor) null );
    }
            
  }
}