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 Interface 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 InterfaceLazyAdapter extends ClazzLazyAdapter implements Interface {
  35 
  36     private final TestBuilder builder;
  37     private final String name;
  38 
  39     private Interface target;
  40 
  41     public InterfaceLazyAdapter(TestBuilder builder, String name) {
  42         super(builder, name);
  43 
  44         this.builder = builder;
  45         this.name = name;
  46     }
  47 
  48     private Interface delegate() {
  49         if (target == null) {
  50             target = (Interface)builder.lookup(name);
  51         }
  52 
  53         return target;
  54     }
  55 
  56     @Override
  57     public Interface[] parents() {
  58         return delegate().parents();
  59     }
  60 
  61     @Override
  62     public void visit(Visitor v) {
  63         delegate().visit(v);
  64     }
  65 }