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1 /*
2  * Copyright 2018, 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 
32 package org.jf.dexlib2.writer.builder;
33 
34 import com.google.common.collect.Maps;
35 import org.jf.dexlib2.iface.value.ArrayEncodedValue;
36 import org.jf.dexlib2.writer.EncodedArraySection;
37 import org.jf.dexlib2.writer.builder.BuilderEncodedValues.BuilderArrayEncodedValue;
38 import org.jf.dexlib2.writer.builder.BuilderEncodedValues.BuilderEncodedValue;
39 
40 import javax.annotation.Nonnull;
41 import java.util.Collection;
42 import java.util.List;
43 import java.util.Map;
44 import java.util.concurrent.ConcurrentMap;
45 
46 public class BuilderEncodedArrayPool extends BaseBuilderPool implements
47         EncodedArraySection<BuilderArrayEncodedValue, BuilderEncodedValue> {
48     @Nonnull private final ConcurrentMap<ArrayEncodedValue, BuilderArrayEncodedValue> internedItems =
49             Maps.newConcurrentMap();
50 
BuilderEncodedArrayPool(@onnull DexBuilder dexBuilder)51     public BuilderEncodedArrayPool(@Nonnull DexBuilder dexBuilder) {
52         super(dexBuilder);
53     }
54 
internArrayEncodedValue(@onnull ArrayEncodedValue arrayEncodedValue)55     @Nonnull public BuilderArrayEncodedValue internArrayEncodedValue(@Nonnull ArrayEncodedValue arrayEncodedValue) {
56         BuilderArrayEncodedValue builderArrayEncodedValue = internedItems.get(arrayEncodedValue);
57         if (builderArrayEncodedValue != null) {
58             return builderArrayEncodedValue;
59         }
60 
61         builderArrayEncodedValue = (BuilderArrayEncodedValue)dexBuilder.internEncodedValue(arrayEncodedValue);
62         BuilderArrayEncodedValue previous = internedItems.putIfAbsent(
63                 builderArrayEncodedValue, builderArrayEncodedValue);
64         return previous == null ? builderArrayEncodedValue : previous;
65     }
66 
67     @Override
getItemOffset(@onnull BuilderArrayEncodedValue builderArrayEncodedValue)68     public int getItemOffset(@Nonnull BuilderArrayEncodedValue builderArrayEncodedValue) {
69         return builderArrayEncodedValue.offset;
70     }
71 
72     @Nonnull
73     @Override
getItems()74     public Collection<? extends Map.Entry<? extends BuilderArrayEncodedValue, Integer>> getItems() {
75         return new BuilderMapEntryCollection<BuilderArrayEncodedValue>(internedItems.values()) {
76             @Override
77             protected int getValue(@Nonnull BuilderArrayEncodedValue builderArrayEncodedValue) {
78                 return builderArrayEncodedValue.offset;
79             }
80 
81             @Override
82             protected int setValue(@Nonnull BuilderArrayEncodedValue key, int value) {
83                 int prev = key.offset;
84                 key.offset = value;
85                 return prev;
86             }
87         };
88     }
89 
90     @Override
91     public List<? extends BuilderEncodedValue> getEncodedValueList(BuilderArrayEncodedValue builderArrayEncodedValue) {
92         return builderArrayEncodedValue.elements;
93     }
94 }
95