1 /*
   2  * Copyright (c) 2014, 2016, 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.beans.introspect;
  27 
  28 import com.sun.beans.TypeResolver;
  29 import com.sun.beans.finder.MethodFinder;
  30 
  31 import java.lang.reflect.Method;
  32 import java.lang.reflect.Modifier;
  33 import java.lang.reflect.Type;
  34 import java.util.ArrayList;
  35 import java.util.Arrays;
  36 import java.util.Collections;
  37 import java.util.Comparator;
  38 import java.util.List;
  39 



  40 final class MethodInfo {
  41     final Method method;
  42     final Class<?> type;
  43 
  44     MethodInfo(Method method, Class<?> type) {
  45         this.method = method;
  46         this.type = type;
  47     }
  48 
  49     MethodInfo(Method method, Type type) {
  50         this.method = method;
  51         this.type = resolve(method, type);
  52     }
  53 
  54     boolean isThrow(Class<?> exception) {
  55         for (Class<?> type : this.method.getExceptionTypes()) {
  56             if (type == exception) {
  57                 return true;
  58             }
  59         }
  60         return false;
  61     }
  62 
  63     static Class<?> resolve(Method method, Type type) {
  64         return TypeResolver.erase(TypeResolver.resolveInClass(method.getDeclaringClass(), type));
  65     }
  66 
  67     static List<Method> get(Class<?> type) {
  68         List<Method> list = null;
  69         if (type != null) {
  70             boolean inaccessible = !Modifier.isPublic(type.getModifiers());
  71             for (Method method : type.getMethods()) {
  72                 if (method.getDeclaringClass().equals(type)) {
  73                     if (inaccessible) {
  74                         try {
  75                             method = MethodFinder.findAccessibleMethod(method);
  76                             if (!method.getDeclaringClass().isInterface()) {
  77                                 method = null; // ignore methods from superclasses
  78                             }
  79                         } catch (NoSuchMethodException exception) {
  80                             // commented out because of 6976577
  81                             // method = null; // ignore inaccessible methods
  82                         }
  83                     }
  84                     if (method != null) {
  85                         if (list == null) {
  86                             list = new ArrayList<>();
  87                         }
  88                         list.add(method);
  89                     }
  90                 }
  91             }
  92         }
  93         if (list != null) {
  94             list.sort(MethodOrder.instance);
  95             return Collections.unmodifiableList(list);
  96         }
  97         return Collections.emptyList();
  98     }
  99 
 100     /**
 101      * A comparator that defines a total order so that methods have the same
 102      * name and identical signatures appear next to each others. The methods are
 103      * sorted in such a way that methods which override each other will sit next
 104      * to each other, with the overridden method last - e.g. is Integer getFoo()
 105      * placed before Object getFoo().
 106      **/
 107     private static final class MethodOrder implements Comparator<Method> {
 108 
 109         /*
 110          * Code particularly was copied from com.sun.jmx.mbeanserver.MethodOrder
 111          */
 112         @Override
 113         public int compare(final Method a, final Method b) {
 114             int cmp = a.getName().compareTo(b.getName());
 115             if (cmp != 0) {
 116                 return cmp;
 117             }
 118             final Class<?>[] aparams = a.getParameterTypes();
 119             final Class<?>[] bparams = b.getParameterTypes();
 120             if (aparams.length != bparams.length) {
 121                 return aparams.length - bparams.length;
 122             }
 123             for (int i = 0; i < aparams.length; ++i) {
 124                 final Class<?> aparam = aparams[i];
 125                 final Class<?> bparam = bparams[i];
 126                 if (aparam == bparam) {
 127                     continue;
 128                 }
 129                 cmp = aparam.getName().compareTo(bparam.getName());
 130                 if (cmp != 0) {
 131                     return cmp;
 132                 }
 133             }
 134             final Class<?> aret = a.getReturnType();
 135             final Class<?> bret = b.getReturnType();
 136             if (aret == bret) {
 137                 return 0;
 138             }
 139 
 140             // Super type comes last: Integer, Number, Object
 141             if (aret.isAssignableFrom(bret)) {
 142                 return 1;
 143             }

 144             return -1;
 145         }


 146 
 147         static final MethodOrder instance = new MethodOrder();
 148     }
 149 }
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