1 /*
   2  * Copyright (c) 1997, 2012, 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.xml.internal.bind.v2.model.nav;
  27 
  28 import java.lang.reflect.GenericArrayType;
  29 import java.lang.reflect.ParameterizedType;
  30 import java.lang.reflect.Type;
  31 import java.lang.reflect.TypeVariable;
  32 import java.lang.reflect.WildcardType;
  33 
  34 /**
  35  * @author Kohsuke Kawaguchi
  36  */
  37 abstract class TypeVisitor<T,P> {
  38     public final T visit( Type t, P param ) {
  39         assert t!=null;
  40 
  41         if (t instanceof Class)
  42             return onClass((Class)t,param);
  43         if (t instanceof ParameterizedType)
  44             return onParameterizdType( (ParameterizedType)t,param);
  45         if(t instanceof GenericArrayType)
  46             return onGenericArray((GenericArrayType)t,param);
  47         if(t instanceof WildcardType)
  48             return onWildcard((WildcardType)t,param);
  49         if(t instanceof TypeVariable)
  50             return onVariable((TypeVariable)t,param);
  51 
  52         // covered all the cases
  53         assert false;
  54         throw new IllegalArgumentException();
  55     }
  56 
  57     protected abstract T onClass(Class c, P param);
  58     protected abstract T onParameterizdType(ParameterizedType p, P param);
  59     protected abstract T onGenericArray(GenericArrayType g, P param);
  60     protected abstract T onVariable(TypeVariable v, P param);
  61     protected abstract T onWildcard(WildcardType w, P param);
  62 }