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.util; 33 34 import com.google.common.base.Function; 35 import com.google.common.base.Predicate; 36 import com.google.common.collect.Iterables; 37 import org.jf.dexlib2.base.value.BaseArrayEncodedValue; 38 import org.jf.dexlib2.iface.Field; 39 import org.jf.dexlib2.iface.value.ArrayEncodedValue; 40 import org.jf.dexlib2.iface.value.EncodedValue; 41 import org.jf.dexlib2.immutable.value.ImmutableEncodedValueFactory; 42 import org.jf.dexlib2.util.EncodedValueUtils; 43 import org.jf.util.AbstractForwardSequentialList; 44 import org.jf.util.CollectionUtils; 45 46 import javax.annotation.Nonnull; 47 import javax.annotation.Nullable; 48 import java.util.Iterator; 49 import java.util.List; 50 import java.util.SortedSet; 51 52 public class StaticInitializerUtil { 53 getStaticInitializers( @onnull SortedSet<? extends Field> sortedStaticFields)54 @Nullable public static ArrayEncodedValue getStaticInitializers( 55 @Nonnull SortedSet<? extends Field> sortedStaticFields) { 56 final int lastIndex = CollectionUtils.lastIndexOf(sortedStaticFields, HAS_INITIALIZER); 57 if (lastIndex > -1) { 58 return new BaseArrayEncodedValue() { 59 @Nonnull 60 @Override 61 public List<? extends EncodedValue> getValue() { 62 return new AbstractForwardSequentialList<EncodedValue>() { 63 @Nonnull @Override public Iterator<EncodedValue> iterator() { 64 Iterable<? extends Field> fields = Iterables.limit(sortedStaticFields, lastIndex + 1); 65 return Iterables.transform(fields, GET_INITIAL_VALUE).iterator(); 66 } 67 68 @Override public int size() { 69 return lastIndex+1; 70 } 71 }; 72 } 73 }; 74 } 75 return null; 76 } 77 78 private static final Predicate<Field> HAS_INITIALIZER = new Predicate<Field>() { 79 @Override 80 public boolean apply(Field input) { 81 EncodedValue encodedValue = input.getInitialValue(); 82 return encodedValue != null && !EncodedValueUtils.isDefaultValue(encodedValue); 83 } 84 }; 85 86 private static final Function<Field, EncodedValue> GET_INITIAL_VALUE = new Function<Field, EncodedValue>() { 87 @Override 88 public EncodedValue apply(Field input) { 89 EncodedValue initialValue = input.getInitialValue(); 90 if (initialValue == null) { 91 return ImmutableEncodedValueFactory.defaultValueForType(input.getType()); 92 } 93 return initialValue; 94 } 95 }; 96 97 } 98