| // Copyright 2018 The Bazel Authors. All rights reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package com.google.devtools.build.lib.skyframe.serialization; |
| |
| import com.google.protobuf.CodedInputStream; |
| import com.google.protobuf.CodedOutputStream; |
| import java.io.IOException; |
| import java.lang.reflect.Array; |
| |
| /** {@link ObjectCodec} for arrays of an arbitrary component type. */ |
| public class ArrayCodec<T> implements ObjectCodec<T[]> { |
| |
| /** Creates a codec for arrays of the given component type. */ |
| public static <T> ArrayCodec<T> forComponentType(Class<T> componentType) { |
| @SuppressWarnings("unchecked") |
| Class<T[]> arrayType = (Class<T[]>) Array.newInstance(componentType, 0).getClass(); |
| return new ArrayCodec<>(componentType, arrayType); |
| } |
| |
| /** Codec for {@code Object[]}. */ |
| static final class ObjectArrayCodec extends ArrayCodec<Object> { |
| ObjectArrayCodec() { |
| super(Object.class, Object[].class); |
| } |
| } |
| |
| private final Class<T> componentType; |
| private final Class<T[]> arrayType; |
| |
| private ArrayCodec(Class<T> componentType, Class<T[]> arrayType) { |
| this.componentType = componentType; |
| this.arrayType = arrayType; |
| } |
| |
| @Override |
| public final Class<T[]> getEncodedClass() { |
| return arrayType; |
| } |
| |
| @Override |
| public final void serialize(SerializationContext context, T[] obj, CodedOutputStream codedOut) |
| throws SerializationException, IOException { |
| codedOut.writeInt32NoTag(obj.length); |
| try { |
| for (Object item : obj) { |
| context.serialize(item, codedOut); |
| } |
| } catch (StackOverflowError e) { |
| // TODO(janakr): figure out if we need to handle this better and handle it better if so. |
| throw new SerializationException("StackOverflow serializing array", e); |
| } |
| } |
| |
| @Override |
| public final T[] deserialize(DeserializationContext context, CodedInputStream codedIn) |
| throws SerializationException, IOException { |
| @SuppressWarnings("unchecked") |
| T[] result = (T[]) Array.newInstance(componentType, codedIn.readInt32()); |
| try { |
| for (int i = 0; i < result.length; i++) { |
| result[i] = context.deserialize(codedIn); |
| } |
| } catch (StackOverflowError e) { |
| // TODO(janakr): figure out if we need to handle this better and handle it better if so. |
| throw new SerializationException("StackOverflow deserializing array", e); |
| } |
| return result; |
| } |
| } |