ImmutableTryBlock.java revision 5916df99999ae58f707d829792ef3997546628fd 
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.immutable;
33
34import com.google.common.collect.ImmutableList;
35import org.jf.dexlib2.base.BaseTryBlock;
36import org.jf.dexlib2.iface.ExceptionHandler;
37import org.jf.dexlib2.iface.TryBlock;
38import org.jf.util.ImmutableConverter;
39import org.jf.util.ImmutableUtils;
40
41import javax.annotation.Nonnull;
42import javax.annotation.Nullable;
43import java.util.List;
44
45public class ImmutableTryBlock extends BaseTryBlock implements TryBlock {
46    protected final int startCodeAddress;
47    protected final int codeUnitCount;
48    @Nonnull protected final ImmutableList<? extends ImmutableExceptionHandler> exceptionHandlers;
49
50    public ImmutableTryBlock(int startCodeAddress,
51                             int codeUnitCount,
52                             @Nullable List<? extends ExceptionHandler> exceptionHandlers) {
53        this.startCodeAddress = startCodeAddress;
54        this.codeUnitCount = codeUnitCount;
55        this.exceptionHandlers = ImmutableExceptionHandler.immutableListOf(exceptionHandlers);
56    }
57
58    public ImmutableTryBlock(int startCodeAddress,
59                             int codeUnitCount,
60                             @Nullable ImmutableList<? extends ImmutableExceptionHandler> exceptionHandlers) {
61        this.startCodeAddress = startCodeAddress;
62        this.codeUnitCount = codeUnitCount;
63        this.exceptionHandlers = ImmutableUtils.nullToEmptyList(exceptionHandlers);
64    }
65
66    public static ImmutableTryBlock of(TryBlock tryBlock) {
67        if (tryBlock instanceof ImmutableTryBlock) {
68            return (ImmutableTryBlock)tryBlock;
69        }
70        return new ImmutableTryBlock(
71                tryBlock.getStartCodeAddress(),
72                tryBlock.getCodeUnitCount(),
73                tryBlock.getExceptionHandlers());
74    }
75
76    @Override public int getStartCodeAddress() { return startCodeAddress; }
77    @Override public int getCodeUnitCount() { return codeUnitCount; }
78
79    @Nonnull @Override public ImmutableList<? extends ImmutableExceptionHandler> getExceptionHandlers() {
80        return exceptionHandlers;
81    }
82
83    @Nonnull
84    public static ImmutableList<ImmutableTryBlock> immutableListOf(@Nullable List<? extends TryBlock> list) {
85        return CONVERTER.toList(list);
86    }
87
88    private static final ImmutableConverter<ImmutableTryBlock, TryBlock> CONVERTER =
89            new ImmutableConverter<ImmutableTryBlock, TryBlock>() {
90                @Override
91                protected boolean isImmutable(@Nonnull TryBlock item) {
92                    return item instanceof ImmutableTryBlock;
93                }
94
95                @Nonnull
96                @Override
97                protected ImmutableTryBlock makeImmutable(@Nonnull TryBlock item) {
98                    return ImmutableTryBlock.of(item);
99                }
100            };
101}
102