1 /*
   2  * Copyright (c) 1997, 2010, 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.codemodel.internal;
  27 
  28 
  29 /**
  30  * Field Reference
  31  */
  32 
  33 public class JFieldRef extends JExpressionImpl implements JAssignmentTarget {
  34     /**
  35      * Object expression upon which this field will be accessed, or
  36      * null for the implicit 'this'.
  37      */
  38     private JGenerable object;
  39 
  40     /**
  41      * Name of the field to be accessed. Either this or {@link #var} is set.
  42      */
  43     private String name;
  44 
  45     /**
  46      * Variable to be accessed.
  47      */
  48     private JVar var;
  49 
  50     /**
  51      * Indicates if an explicit this should be generated
  52      */
  53     private boolean explicitThis;
  54 
  55     /**
  56      * Field reference constructor given an object expression and field name
  57      *
  58      * @param object
  59      *        JExpression for the object upon which
  60      *        the named field will be accessed,
  61      *
  62      * @param name
  63      *        Name of field to access
  64      */
  65     JFieldRef(JExpression object, String name) {
  66         this(object, name, false);
  67     }
  68 
  69     JFieldRef(JExpression object, JVar v) {
  70         this(object, v, false);
  71     }
  72 
  73     /**
  74      * Static field reference.
  75      */
  76     JFieldRef(JType type, String name) {
  77         this(type, name, false);
  78     }
  79 
  80     JFieldRef(JType type, JVar v) {
  81         this(type, v, false);
  82     }
  83 
  84     JFieldRef(JGenerable object, String name, boolean explicitThis) {
  85         this.explicitThis = explicitThis;
  86         this.object = object;
  87         if (name.indexOf('.') >= 0)
  88             throw new IllegalArgumentException("Field name contains '.': " + name);
  89         this.name = name;
  90     }
  91 
  92     JFieldRef(JGenerable object, JVar var, boolean explicitThis) {
  93         this.explicitThis = explicitThis;
  94         this.object = object;
  95         this.var = var;
  96     }
  97 
  98     public void generate(JFormatter f) {
  99         String name = this.name;
 100         if(name==null)  name=var.name();
 101 
 102         if (object != null) {
 103             f.g(object).p('.').p(name);
 104         } else {
 105             if (explicitThis) {
 106                 f.p("this.").p(name);
 107             } else {
 108                 f.id(name);
 109             }
 110         }
 111     }
 112 
 113     public JExpression assign(JExpression rhs) {
 114         return JExpr.assign(this, rhs);
 115     }
 116     public JExpression assignPlus(JExpression rhs) {
 117         return JExpr.assignPlus(this, rhs);
 118     }
 119 }