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