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.writer.builder;
33
34import com.google.common.collect.Maps;
35import org.jf.dexlib2.writer.DexWriter;
36import org.jf.dexlib2.writer.TypeSection;
37
38import javax.annotation.Nonnull;
39import javax.annotation.Nullable;
40import java.util.Collection;
41import java.util.Map.Entry;
42import java.util.concurrent.ConcurrentMap;
43
44class BuilderTypePool implements TypeSection<BuilderStringReference, BuilderTypeReference, BuilderTypeReference> {
45    @Nonnull private final BuilderContext context;
46    @Nonnull private final ConcurrentMap<String, BuilderTypeReference> internedItems = Maps.newConcurrentMap();
47
48    BuilderTypePool(@Nonnull BuilderContext context) {
49        this.context = context;
50    }
51
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
63    @Nullable public BuilderTypeReference internNullableType(@Nullable String type) {
64        if (type == null) {
65            return null;
66        }
67        return internType(type);
68    }
69
70    @Nonnull @Override public BuilderStringReference getString(@Nonnull BuilderTypeReference key) {
71        return key.stringReference;
72    }
73
74    @Override public int getNullableItemIndex(@Nullable BuilderTypeReference key) {
75        return key==null?DexWriter.NO_INDEX:key.index;
76    }
77
78    @Override public int getItemIndex(@Nonnull BuilderTypeReference key) {
79        return key.getIndex();
80    }
81
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