ExpressionStmt.java

/* 
  Copyright (C) 2013 Raquel Pau and Albert Coroleu.
 
 Walkmod is free software: you can redistribute it and/or modify
 it under the terms of the GNU Lesser General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
 
 Walkmod is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU Lesser General Public License for more details.
 
 You should have received a copy of the GNU Lesser General Public License
 along with Walkmod.  If not, see <http://www.gnu.org/licenses/>.*/
package org.walkmod.javalang.ast.stmt;

import java.util.List;

import org.walkmod.javalang.ast.Node;
import org.walkmod.javalang.ast.expr.Expression;
import org.walkmod.javalang.visitors.GenericVisitor;
import org.walkmod.javalang.visitors.VoidVisitor;

/**
 * @author Julio Vilmar Gesser
 */
public final class ExpressionStmt extends Statement {

   private Expression expr;

   public ExpressionStmt() {
   }

   public ExpressionStmt(Expression expr) {
      setExpression(expr);
   }

   public ExpressionStmt(int beginLine, int beginColumn, int endLine, int endColumn, Expression expr) {
      super(beginLine, beginColumn, endLine, endColumn);
      setExpression(expr);
   }
   
   @Override
   public boolean removeChild(Node child) {
      boolean result = false;
      if(child != null){
         if(expr == child){
            expr = null;
            result = true;
         }
      }
      if(result){
         updateReferences(child);
      }
      return result;
   }

   @Override
   public List<Node> getChildren() {
      List<Node> children = super.getChildren();
      if (expr != null) {
         children.add(expr);
      }
      return children;
   }

   @Override
   public <R, A> R accept(GenericVisitor<R, A> v, A arg) {
      if (!check()) {
         return null;
      }
      return v.visit(this, arg);
   }

   @Override
   public <A> void accept(VoidVisitor<A> v, A arg) {
      if (check()) {
         v.visit(this, arg);
      }
   }

   public Expression getExpression() {
      return expr;
   }

   public void setExpression(Expression expr) {
      if (this.expr != null) {
         updateReferences(this.expr);
      }
      this.expr = expr;
      setAsParentNodeOf(expr);
   }

   @Override
   public boolean replaceChildNode(Node oldChild, Node newChild) {
      boolean updated = false;
      if (oldChild == expr) {
         setExpression((Expression) newChild);
         updated = true;
      }

      return updated;
   }

   @Override
   public ExpressionStmt clone() throws CloneNotSupportedException {
      return new ExpressionStmt(clone(expr));
   }
}