BaseExceptionHandler.java revision f3c33259dd0567294ef814be879b59a450c24f70 
1/*
2 * Copyright 2012, 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.base;
33
34import com.google.common.base.Objects;
35import com.google.common.primitives.Ints;
36import org.jf.dexlib2.iface.ExceptionHandler;
37
38import javax.annotation.Nonnull;
39import javax.annotation.Nullable;
40import java.util.Comparator;
41
42public abstract class BaseExceptionHandler implements ExceptionHandler {
43    @Override
44    public int hashCode() {
45        String exceptionType = getExceptionType();
46        int hashCode = exceptionType==null?0:exceptionType.hashCode();
47        return hashCode*31 + getHandlerCodeAddress();
48    }
49
50    @Override
51    public boolean equals(@Nullable Object o) {
52        if (o instanceof ExceptionHandler) {
53            ExceptionHandler other = (ExceptionHandler)o;
54            return Objects.equal(getExceptionType(), other.getExceptionType()) &&
55                   (getHandlerCodeAddress() == other.getHandlerCodeAddress());
56        }
57        return false;
58    }
59
60    @Override
61    public int compareTo(@Nonnull ExceptionHandler o) {
62        int res;
63        String exceptionType = getExceptionType();
64        if (exceptionType == null) {
65            if (o.getExceptionType() != null) {
66                return 1;
67            }
68        } else {
69            String otherExceptionType = o.getExceptionType();
70            if (otherExceptionType == null) {
71                return -1;
72            }
73            res = exceptionType.compareTo(o.getExceptionType());
74            if (res != 0) return res;
75        }
76        return Ints.compare(getHandlerCodeAddress(), o.getHandlerCodeAddress());
77    }
78
79    public static final Comparator<ExceptionHandler> BY_EXCEPTION = new Comparator<ExceptionHandler>() {
80        @Override public int compare(ExceptionHandler o1, ExceptionHandler o2) {
81            String exceptionType1 = o1.getExceptionType();
82            if (exceptionType1 == null) {
83                if (o2.getExceptionType() != null) {
84                    return 1;
85                }
86                return 0;
87            } else {
88                String exceptionType2 = o2.getExceptionType();
89                if (exceptionType2 == null) {
90                    return -1;
91                }
92                return exceptionType1.compareTo(o2.getExceptionType());
93            }
94        }
95    };
96}
97