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1   package com.lexicalscope.fluentreflection;
2   
3   /*
4    * Copyright 2011 Tim Wood
5    *
6    * Licensed under the Apache License, Version 2.0 (the "License");
7    * you may not use this file except in compliance with the License.
8    * You may obtain a copy of the License at
9    *
10   * http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  import java.util.ArrayList;
20  import java.util.LinkedList;
21  import java.util.List;
22  
23  import com.google.inject.TypeLiteral;
24  
25  final class TypeHierarchyCalculation {
26      private final List<TypeLiteral<?>> done = new ArrayList<TypeLiteral<?>>();
27      private final List<FluentClass<?>> result = new ArrayList<FluentClass<?>>();
28      private final List<TypeLiteral<?>> pending = new LinkedList<TypeLiteral<?>>();
29      private final ReflectedTypeFactory reflectedTypeFactory;
30  
31      public TypeHierarchyCalculation(final ReflectedTypeFactory reflectedTypeFactory) {
32          this.reflectedTypeFactory = reflectedTypeFactory;
33      }
34  
35      List<FluentClass<?>> interfacesAndSuperClass(final TypeLiteral<?> typeLiteral) {
36          queueSuperclassAndInterfaces(typeLiteral);
37          processesPendingTypes();
38          return result;
39      }
40  
41      private void processesPendingTypes() {
42          while (!pending.isEmpty()) {
43              processClass(pending.remove(0));
44          }
45      }
46  
47      private void processClass(final TypeLiteral<?> klassToReflect) {
48          queueSuperclassAndInterfaces(klassToReflect);
49          if (done.contains(klassToReflect)) {
50              return;
51          }
52          done.add(klassToReflect);
53          result.add(reflectedTypeFactory.reflect(klassToReflect));
54      }
55  
56      private void queueSuperclassAndInterfaces(final TypeLiteral<?> typeLiteralToReflect) {
57          final Class<?> rawSuperclass = typeLiteralToReflect.getRawType().getSuperclass();
58          if (rawSuperclass != null && !rawSuperclass.equals(Object.class)) {
59              pending.add(typeLiteralToReflect.getSupertype(rawSuperclass));
60          }
61          final Class<?>[] interfaces = typeLiteralToReflect.getRawType().getInterfaces();
62          for (final Class<?> interfac3 : interfaces) {
63              pending.add(typeLiteralToReflect.getSupertype(interfac3));
64          }
65      }
66  }