org.jboss.marshalling.ChainingClassTable Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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 org.jboss.marshalling;
import java.util.List;
import java.util.ArrayList;
import java.io.IOException;
import java.io.StreamCorruptedException;
/**
* A class table that multiplexes up to 256 class tables. The protocol works by prepending the custom class table
* with an identifier byte.
*/
public class ChainingClassTable implements ClassTable {
private static Pair pair(final ClassTable classTable, final Writer writer) {
return Pair.create(classTable, writer);
}
private final List> writers;
private final ClassTable[] readers;
/**
* Construct a new instance. The given array may be sparse, but it may not be more than
* 256 elements in length. Class tables are checked in order of increasing array index.
*
* @param classTables the class tables to delegate to
*/
public ChainingClassTable(final ClassTable[] classTables) {
if (classTables == null) {
throw new NullPointerException("classTables is null");
}
readers = classTables.clone();
if (readers.length > 256) {
throw new IllegalArgumentException("Class table array is too long (limit is 256 elements)");
}
writers = new ArrayList>();
for (int i = 0; i < readers.length; i++) {
final ClassTable classTable = readers[i];
if (classTable != null) {
final int idx = i;
writers.add(pair(classTable, new Writer() {
public void writeClass(final Marshaller marshaller, final Class clazz) throws IOException {
marshaller.writeByte(idx);
classTable.getClassWriter(clazz).writeClass(marshaller, clazz);
}
}));
}
}
}
/** {@inheritDoc} */
public Writer getClassWriter(final Class clazz) throws IOException {
for (Pair entry : writers) {
final ClassTable table = entry.getA();
final Writer writer = entry.getB();
if (table.getClassWriter(clazz) != null) {
return writer;
}
}
return null;
}
/** {@inheritDoc} */
public Class readClass(final Unmarshaller unmarshaller) throws IOException, ClassNotFoundException {
final int v = unmarshaller.readByte() & 0xff;
final ClassTable table = readers[v];
if (table == null) {
throw new StreamCorruptedException(String.format("Unknown class table ID %02x encountered", Integer.valueOf(v)));
}
return table.readClass(unmarshaller);
}
}