1 /*
   2  * Copyright (c) 2013, 2018, 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.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 package vm.runtime.defmeth.shared.data;
  25 
  26 import vm.runtime.defmeth.shared.builder.TestBuilder;
  27 
  28 /**
  29  * Wrapper around some ConcreteClass instance. It delegates all calls to
  30  * underlying instance. Lazy resolution of a target instance by it's name
  31  * allows to delay resolution till runtime and "tie-the-knot" in recursive
  32  * hierarchies.
  33  */
  34 public class ConcreteClassLazyAdapter extends ClazzLazyAdapter implements ConcreteClass {
  35     private final TestBuilder builder;
  36     private final String name;
  37 
  38     private ConcreteClass target;
  39 
  40     public ConcreteClassLazyAdapter(TestBuilder builder, String name) {
  41         super(builder, name);
  42 
  43         this.builder = builder;
  44         this.name = name;
  45     }
  46 
  47     private ConcreteClass delegate() {
  48         if (target == null) {
  49             target = (ConcreteClass)builder.lookup(name);
  50         }
  51 
  52         return target;
  53     }
  54 
  55     @Override
  56     public ConcreteClass parent() {
  57         return delegate().parent();
  58     }
  59 
  60     @Override
  61     public Interface[] interfaces() {
  62         return delegate().interfaces();
  63     }
  64 
  65     @Override
  66     public void visit(Visitor v) {
  67         delegate().visit(v);
  68     }
  69 }