1/*
2 * Copyright 2013, Google Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 *     * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *     * Redistributions in binary form must reproduce the above
12 * copyright notice, this list of conditions and the following disclaimer
13 * in the documentation and/or other materials provided with the
14 * distribution.
15 *     * Neither the name of Google Inc. nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32package org.jf.dexlib2.analysis;
33
34import org.jf.dexlib2.iface.reference.FieldReference;
35import org.jf.dexlib2.iface.reference.MethodReference;
36
37import javax.annotation.Nonnull;
38import javax.annotation.Nullable;
39
40public class UnknownClassProto implements TypeProto {
41    @Nonnull protected final ClassPath classPath;
42
43    public UnknownClassProto(@Nonnull ClassPath classPath) {
44        this.classPath = classPath;
45    }
46
47    @Override public String toString() { return "Ujava/lang/Object;"; }
48    @Nonnull @Override public ClassPath getClassPath() { return classPath; }
49    @Nullable @Override public String getSuperclass() { return null; }
50    @Override public boolean isInterface() { return false; }
51    @Override public boolean implementsInterface(@Nonnull String iface) { return false; }
52
53    @Nonnull @Override public TypeProto getCommonSuperclass(@Nonnull TypeProto other) {
54        if (other.getType().equals("Ljava/lang/Object;")) {
55            return other;
56        }
57        if (other instanceof ArrayProto) {
58            // if it's an array class, it's safe to assume this unknown class isn't related, and so
59            // java.lang.Object is the only possible superclass
60            return classPath.getClass("Ljava/lang/Object;");
61        }
62        return this;
63    }
64
65    @Nonnull @Override public String getType() {
66        // use the otherwise used U prefix for an unknown/unresolvable class
67        return "Ujava/lang/Object;";
68    }
69
70    @Override
71    @Nullable
72    public FieldReference getFieldByOffset(int fieldOffset) {
73        return classPath.getClass("Ljava/lang/Object;").getFieldByOffset(fieldOffset);
74    }
75
76    @Override
77    @Nullable
78    public MethodReference getMethodByVtableIndex(int vtableIndex) {
79        return classPath.getClass("Ljava/lang/Object;").getMethodByVtableIndex(vtableIndex);
80    }
81}
82