| /* |
| * Copyright 2012, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package org.jf.dexlib2.dexbacked.util; |
| |
| import org.jf.dexlib2.dexbacked.DexBackedDexFile; |
| import org.jf.dexlib2.dexbacked.DexReader; |
| import org.jf.dexlib2.dexbacked.value.DexBackedEncodedValue; |
| import org.jf.dexlib2.iface.value.EncodedValue; |
| |
| import javax.annotation.Nonnull; |
| import javax.annotation.Nullable; |
| |
| public abstract class EncodedArrayItemIterator { |
| public static final EncodedArrayItemIterator EMPTY = new EncodedArrayItemIterator() { |
| @Nullable @Override public EncodedValue getNextOrNull() { return null; } |
| @Override public void skipNext() {} |
| @Override public int getReaderOffset() { return 0; } |
| }; |
| |
| @Nullable public abstract EncodedValue getNextOrNull(); |
| public abstract void skipNext(); |
| public abstract int getReaderOffset(); |
| |
| @Nonnull |
| public static EncodedArrayItemIterator newOrEmpty(@Nonnull DexBackedDexFile dexFile, int offset) { |
| if (offset == 0) { |
| return EMPTY; |
| } |
| return new EncodedArrayItemIteratorImpl(dexFile, offset); |
| } |
| |
| private static class EncodedArrayItemIteratorImpl extends EncodedArrayItemIterator { |
| @Nonnull private final DexReader reader; |
| private final int size; |
| private int index = 0; |
| |
| public EncodedArrayItemIteratorImpl(@Nonnull DexBackedDexFile dexFile, int offset) { |
| this.reader = dexFile.readerAt(offset); |
| this.size = reader.readSmallUleb128(); |
| } |
| |
| @Nullable |
| public EncodedValue getNextOrNull() { |
| if (index < size) { |
| index++; |
| return DexBackedEncodedValue.readFrom(reader); |
| } |
| return null; |
| } |
| |
| public void skipNext() { |
| if (index < size) { |
| index++; |
| DexBackedEncodedValue.skipFrom(reader); |
| } |
| } |
| |
| public int getReaderOffset() { |
| return reader.getOffset(); |
| } |
| } |
| } |