1 /*
   2  * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.scenario.effect.compiler.tree;
  27 
  28 import com.sun.scenario.effect.compiler.model.BaseType;
  29 import com.sun.scenario.effect.compiler.model.Type;
  30 
  31 /**
  32  */
  33 public class FieldSelectExpr extends Expr {
  34 
  35     private final Expr expr;
  36     private final String fields;
  37 
  38     FieldSelectExpr(Expr expr, String fields) {
  39         super(getType(expr.getResultType(), fields));
  40         this.expr = expr;
  41         this.fields = fields;
  42     }
  43 
  44     private static Type getType(Type orig, String fields) {
  45         BaseType base = orig.getBaseType();
  46         int len = fields.length();
  47         for (Type type : Type.values()) {
  48             if (type.getBaseType() == base && type.getNumFields() == len) {
  49                 return type;
  50             }
  51         }
  52         throw new RuntimeException("Invalid type for field selection");
  53     }
  54 
  55     public Expr getExpr() {
  56         return expr;
  57     }
  58 
  59     public String getFields() {
  60         return fields;
  61     }
  62 
  63     public void accept(TreeVisitor tv) {
  64         tv.visitFieldSelectExpr(this);
  65     }
  66 }