| // Protocol Buffers - Google's data interchange format |
| // Copyright 2008 Google Inc. All rights reserved. |
| // |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file or at |
| // https://developers.google.com/open-source/licenses/bsd |
| |
| package com.google.protobuf; |
| |
| import com.google.protobuf.Internal.ProtobufList; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| |
| /** |
| * Utility class that aids in properly manipulating list fields for either the lite or full runtime. |
| */ |
| @CheckReturnValue |
| final class ListFieldSchemaFull implements ListFieldSchema { |
| |
| private static final Class<?> UNMODIFIABLE_LIST_CLASS = |
| Collections.unmodifiableList(Collections.emptyList()).getClass(); |
| |
| @Override |
| public <L> List<L> mutableListAt(Object message, long offset) { |
| return mutableListAt(message, offset, AbstractProtobufList.DEFAULT_CAPACITY); |
| } |
| |
| @SuppressWarnings("unchecked") |
| private static <L> List<L> mutableListAt(Object message, long offset, int additionalCapacity) { |
| List<L> list = getList(message, offset); |
| if (list.isEmpty()) { |
| if (list instanceof LazyStringList) { |
| list = (List<L>) new LazyStringArrayList(additionalCapacity); |
| } else if (list instanceof PrimitiveNonBoxingCollection && list instanceof ProtobufList) { |
| list = ((ProtobufList<L>) list).mutableCopyWithCapacity(additionalCapacity); |
| } else { |
| list = new ArrayList<L>(additionalCapacity); |
| } |
| UnsafeUtil.putObject(message, offset, list); |
| } else if (UNMODIFIABLE_LIST_CLASS.isAssignableFrom(list.getClass())) { |
| ArrayList<L> newList = new ArrayList<L>(list.size() + additionalCapacity); |
| newList.addAll(list); |
| list = newList; |
| UnsafeUtil.putObject(message, offset, list); |
| } else if (list instanceof UnmodifiableLazyStringList) { |
| LazyStringArrayList newList = new LazyStringArrayList(list.size() + additionalCapacity); |
| newList.addAll((UnmodifiableLazyStringList) list); |
| list = (List<L>) newList; |
| UnsafeUtil.putObject(message, offset, list); |
| } else if (list instanceof PrimitiveNonBoxingCollection |
| && list instanceof ProtobufList |
| && !((ProtobufList<L>) list).isModifiable()) { |
| list = ((ProtobufList<L>) list).mutableCopyWithCapacity(list.size() + additionalCapacity); |
| UnsafeUtil.putObject(message, offset, list); |
| } |
| return list; |
| } |
| |
| @Override |
| public void makeImmutableListAt(Object message, long offset) { |
| List<?> list = (List<?>) UnsafeUtil.getObject(message, offset); |
| Object immutable = null; |
| if (list instanceof LazyStringList) { |
| immutable = ((LazyStringList) list).getUnmodifiableView(); |
| } else if (UNMODIFIABLE_LIST_CLASS.isAssignableFrom(list.getClass())) { |
| // already immutable |
| return; |
| } else if (list instanceof PrimitiveNonBoxingCollection && list instanceof ProtobufList) { |
| if (((ProtobufList<?>) list).isModifiable()) { |
| ((ProtobufList<?>) list).makeImmutable(); |
| } |
| return; |
| } else { |
| immutable = Collections.unmodifiableList((List<?>) list); |
| } |
| UnsafeUtil.putObject(message, offset, immutable); |
| } |
| |
| @Override |
| public <E> void mergeListsAt(Object msg, Object otherMsg, long offset) { |
| List<E> other = getList(otherMsg, offset); |
| List<E> mine = mutableListAt(msg, offset, other.size()); |
| |
| int size = mine.size(); |
| int otherSize = other.size(); |
| if (size > 0 && otherSize > 0) { |
| mine.addAll(other); |
| } |
| |
| List<E> merged = size > 0 ? mine : other; |
| UnsafeUtil.putObject(msg, offset, merged); |
| } |
| |
| @SuppressWarnings("unchecked") |
| static <E> List<E> getList(Object message, long offset) { |
| return (List<E>) UnsafeUtil.getObject(message, offset); |
| } |
| } |