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 
32 package org.jf.dexlib2.writer.builder;
33 
34 import com.google.common.collect.Maps;
35 import org.jf.dexlib2.writer.DexWriter;
36 import org.jf.dexlib2.writer.TypeSection;
37 
38 import javax.annotation.Nonnull;
39 import javax.annotation.Nullable;
40 import java.util.Collection;
41 import java.util.Map.Entry;
42 import java.util.concurrent.ConcurrentMap;
43 
44 class BuilderTypePool implements TypeSection<BuilderStringReference, BuilderTypeReference, BuilderTypeReference> {
45     @Nonnull private final BuilderContext context;
46     @Nonnull private final ConcurrentMap<String, BuilderTypeReference> internedItems = Maps.newConcurrentMap();
47 
BuilderTypePool(@onnull BuilderContext context)48     BuilderTypePool(@Nonnull BuilderContext context) {
49         this.context = context;
50     }
51 
internType(@onnull String type)52     @Nonnull public BuilderTypeReference internType(@Nonnull String type) {
53         BuilderTypeReference ret = internedItems.get(type);
54         if (ret != null) {
55             return ret;
56         }
57         BuilderStringReference stringRef = context.stringPool.internString(type);
58         BuilderTypeReference typeReference = new BuilderTypeReference(stringRef);
59         ret = internedItems.putIfAbsent(type, typeReference);
60         return ret==null?typeReference:ret;
61     }
62 
internNullableType(@ullable String type)63     @Nullable public BuilderTypeReference internNullableType(@Nullable String type) {
64         if (type == null) {
65             return null;
66         }
67         return internType(type);
68     }
69 
getString(@onnull BuilderTypeReference key)70     @Nonnull @Override public BuilderStringReference getString(@Nonnull BuilderTypeReference key) {
71         return key.stringReference;
72     }
73 
getNullableItemIndex(@ullable BuilderTypeReference key)74     @Override public int getNullableItemIndex(@Nullable BuilderTypeReference key) {
75         return key==null?DexWriter.NO_INDEX:key.index;
76     }
77 
getItemIndex(@onnull BuilderTypeReference key)78     @Override public int getItemIndex(@Nonnull BuilderTypeReference key) {
79         return key.getIndex();
80     }
81 
getItems()82     @Nonnull @Override public Collection<? extends Entry<? extends BuilderTypeReference, Integer>> getItems() {
83         return new BuilderMapEntryCollection<BuilderTypeReference>(internedItems.values()) {
84             @Override protected int getValue(@Nonnull BuilderTypeReference key) {
85                 return key.index;
86             }
87 
88             @Override protected int setValue(@Nonnull BuilderTypeReference key, int value) {
89                 int prev = key.index;
90                 key.index = value;
91                 return prev;
92             }
93         };
94     }
95 }
96