ListOfTypes.java revision 301174b9ed79a73e35d7463f06ae48eb0654c6ca 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package libcore.reflect;
18
19import java.lang.reflect.Type;
20import java.util.ArrayList;
21import java.util.List;
22
23public final class ListOfTypes {
24    public static final ListOfTypes EMPTY = new ListOfTypes(0);
25
26    private final ArrayList<Type> types;
27    private Type[] resolvedTypes;
28
29    ListOfTypes(int capacity) {
30        types = new ArrayList<Type>(capacity);
31    }
32
33    ListOfTypes(Type[] types) {
34        this.types = new ArrayList<Type>(types.length);
35        for (Type type : types) {
36            this.types.add(type);
37        }
38    }
39
40    void add(Type type) {
41        if (type == null) {
42            throw new NullPointerException("type == null");
43        }
44        types.add(type);
45    }
46
47    int length() {
48        return types.size();
49    }
50
51    public Type[] getResolvedTypes() {
52        Type[] result = resolvedTypes;
53        return result != null ? result : (resolvedTypes = resolveTypes(types));
54    }
55
56    private Type[] resolveTypes(List<Type> unresolved) {
57        Type[] result = new Type[unresolved.size()];
58        for (int i = 0; i < unresolved.size(); i++) {
59            Type type = unresolved.get(i);
60            try {
61                result[i] = ((ParameterizedTypeImpl) type).getResolvedType();
62            } catch (ClassCastException e) {
63                result[i] = type;
64            }
65        }
66        return result;
67    }
68
69    @Override public String toString() {
70        StringBuilder result = new StringBuilder();
71        for (int i = 0; i < types.size(); i++) {
72            if (i > 0) {
73                result.append(", ");
74            }
75            result.append(types.get(i));
76        }
77        return result.toString();
78    }
79}
80