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CollectionSerializer.java
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CollectionSerializer.java
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/*
* Copyright 2015 Odnoklassniki Ltd, Mail.Ru Group
*
* 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 one.nio.serial;
import one.nio.serial.gen.StubGenerator;
import java.io.IOException;
import java.io.ObjectInput;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.lang.reflect.Modifier;
import java.util.*;
public class CollectionSerializer extends Serializer<Collection> {
private MethodHandle constructor;
CollectionSerializer(Class cls) {
super(cls);
this.constructor = findConstructor();
}
@Override
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
try {
super.readExternal(in);
} catch (ClassNotFoundException e) {
if ((Repository.getOptions() & Repository.COLLECTION_STUBS) == 0) throw e;
this.cls = StubGenerator.generateRegular(uniqueName("List"), "java/util/ArrayList", null);
this.origin = Origin.GENERATED;
}
this.constructor = findConstructor();
}
@Override
public void calcSize(Collection obj, CalcSizeStream css) throws IOException {
css.count += 4;
for (Object v : obj) {
css.writeObject(v);
}
}
@Override
public void write(Collection obj, DataStream out) throws IOException {
out.writeInt(obj.size());
for (Object v : obj) {
out.writeObject(v);
}
}
@Override
@SuppressWarnings("unchecked")
public Collection read(DataStream in) throws IOException, ClassNotFoundException {
Collection result;
try {
result = (Collection) constructor.invokeExact();
in.register(result);
} catch (Throwable e) {
throw new IOException(e);
}
int length = in.readInt();
for (int i = 0; i < length; i++) {
result.add(in.readObject());
}
return result;
}
@Override
public void skip(DataStream in) throws IOException, ClassNotFoundException {
int length = in.readInt();
for (int i = 0; i < length; i++) {
in.readObject();
}
}
@Override
public void toJson(Collection obj, StringBuilder builder) throws IOException {
builder.append('[');
Iterator iterator = obj.iterator();
if (iterator.hasNext()) {
Json.appendObject(builder, iterator.next());
while (iterator.hasNext()) {
builder.append(',');
Json.appendObject(builder, iterator.next());
}
}
builder.append(']');
}
@Override
public Collection fromJson(JsonReader in) throws IOException, ClassNotFoundException {
return in.readArray();
}
private MethodHandle findConstructor() {
try {
return MethodHandles.publicLookup()
.findConstructor(cls, MethodType.methodType(void.class))
.asType(MethodType.methodType(Collection.class));
} catch (ReflectiveOperationException e) {
// Fallback
}
if (cls == Collections.EMPTY_LIST.getClass()) {
return MethodHandles.constant(Collection.class, Collections.EMPTY_LIST);
} else if (cls == Collections.EMPTY_SET.getClass()) {
return MethodHandles.constant(Collection.class, Collections.EMPTY_SET);
} else if (cls == Collections.emptySortedSet().getClass()) {
return MethodHandles.constant(Collection.class, Collections.emptySortedSet());
}
Class<?> implementation;
if (SortedSet.class.isAssignableFrom(cls)) {
implementation = TreeSet.class;
} else if (Set.class.isAssignableFrom(cls)) {
implementation = HashSet.class;
} else if (Queue.class.isAssignableFrom(cls)) {
implementation = LinkedList.class;
} else {
implementation = ArrayList.class;
}
generateUid();
Repository.log.warn("[" + Long.toHexString(uid) + "] No default constructor for " + descriptor +
", changed type to " + implementation.getName());
try {
return MethodHandles.publicLookup()
.findConstructor(implementation, MethodType.methodType(void.class))
.asType(MethodType.methodType(Collection.class));
} catch (ReflectiveOperationException e) {
throw new AssertionError(e);
}
}
static boolean isValidType(Class<?> type) {
try {
type.getConstructor();
return (type.getModifiers() & Modifier.ABSTRACT) == 0;
} catch (NoSuchMethodException e) {
return type == Collection.class || type == List.class
|| type == Set.class || type == SortedSet.class || type == NavigableSet.class
|| type == Queue.class || type == Deque.class;
}
}
}