/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you 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.facebook.presto.jdbc.internal.netty.handler.codec.serialization;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectStreamClass;
import java.io.StreamCorruptedException;
class CompactObjectInputStream extends ObjectInputStream {
private final ClassResolver classResolver;
CompactObjectInputStream(InputStream in, ClassResolver classResolver) throws IOException {
super(in);
if (classResolver == null) {
throw new NullPointerException("classResolver");
}
this.classResolver = classResolver;
}
@Override
protected void readStreamHeader() throws IOException {
int version = readByte() & 0xFF;
if (version != STREAM_VERSION) {
throw new StreamCorruptedException(
"Unsupported version: " + version);
}
}
@Override
protected ObjectStreamClass readClassDescriptor()
throws IOException, ClassNotFoundException {
int type = read();
if (type < 0) {
throw new EOFException();
}
switch (type) {
case CompactObjectOutputStream.TYPE_FAT_DESCRIPTOR:
return super.readClassDescriptor();
case CompactObjectOutputStream.TYPE_THIN_DESCRIPTOR:
String className = readUTF();
Class<?> clazz = classResolver.resolve(className);
ObjectStreamClass streamClass = ObjectStreamClass.lookup(clazz);
if (streamClass == null) {
// If streamClass is null its very likely that we had an old netty version that was writing an
// interface with a thin descriptor. Fall back to use ObjectStreamClazz.lookupAny(..) to resolve
// it.
//
// This will only work on java6+ but if we hit this line its very likely that a user is upgrading
// from netty 3.2.x which was using the method before and so use java6+.
//
// See https://github.com/netty/netty/commit/6c2eba79d70a532822a0e38092faa9783d90906b
streamClass = ObjectStreamClass.lookupAny(clazz);
}
return streamClass;
default:
throw new StreamCorruptedException(
"Unexpected class descriptor type: " + type);
}
}
@Override
protected Class<?> resolveClass(ObjectStreamClass desc) throws IOException, ClassNotFoundException {
Class<?> clazz;
try {
clazz = classResolver.resolve(desc.getName());
} catch (ClassNotFoundException ex) {
clazz = super.resolveClass(desc);
}
return clazz;
}
}