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/*
*
* This file is part of GNUnet.
* Copyright (C) 2011 Christian Grothoff (and other contributing authors)
*
* GNUnet is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2, or (at your
* option) any later version.
*
* GNUnet is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNUnet; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
package org.gnunet.construct;
import com.google.common.base.Charsets;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.BufferedReader;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
/**
* Load message maps, which contain the information the parse/write unions.
*/
public class MessageLoader {
private static final Logger logger = LoggerFactory
.getLogger(MessageLoader.class);
/**
* Thrown when trying to serialize an object that is not registered as a union type.
*/
public static class UnknownUnionException extends RuntimeException {
public UnknownUnionException(String msg) {
super(msg);
}
}
/**
* Thrown when parsing a union whose ID is not known.
*/
public static class UnknownUnionIdException extends RuntimeException {
}
/**
* Maps a class and tag to the corresponding union case.
* <p/>
* XXX: how much of generics is too much?
*/
private static Map<Class<? extends MessageUnion>, Map<Integer, Class<? extends MessageUnion>>> unionmap
= new HashMap<Class<? extends MessageUnion>, Map<Integer, Class<? extends MessageUnion>>>(100);
/*
* Maps a union interface and union case to the corresponding tag.
*/
private static Map<Class<? extends MessageUnion>, Map<Class<? extends MessageUnion>, Integer>> tagmap
= new HashMap<Class<? extends MessageUnion>, Map<Class<? extends MessageUnion>, Integer>>(100);
static {
ClassLoader classLoader = MessageLoader.class.getClassLoader();
Enumeration<URL> resources;
try {
resources = classLoader.getResources("org/gnunet/construct/MsgMap.txt");
} catch (IOException e) {
throw new RuntimeException("something went wrong with loading MsgMap.txt");
}
while (resources.hasMoreElements()) {
loadMessageMap(resources.nextElement());
}
if (tagmap.isEmpty()) {
logger.warn("message map empty");
}
}
public static void loadMessageMap(URL loc) {
if (loc == null) {
throw new RuntimeException("could not load message map");
}
BufferedReader in = null;
try {
in = new BufferedReader(new InputStreamReader(loc.openStream(), Charsets.UTF_8));
String line;
while ((line = in.readLine()) != null) {
// skip empty lines and comments
if (line.isEmpty() || line.charAt(0) == '#') {
continue;
}
String[] m = line.split("=");
if (m.length != 2) {
throw new RuntimeException("invalid message map format (separation by '=')");
}
String[] left = m[0].split("[|]");
if (left.length != 2) {
logger.debug(m[0]);
logger.debug(m[1]);
logger.debug("split in " + left.length);
throw new RuntimeException("invalid message map format (left hand side)");
}
int id = java.lang.Integer.parseInt(left[1].trim());
String unionCaseName = m[1].trim();
String unionInterfaceName = left[0];
Class<? extends MessageUnion> unionInterface = loadClass(unionInterfaceName);
Class<? extends MessageUnion> unionCase = loadClass(unionCaseName);
if (!unionmap.containsKey(unionInterface)) {
unionmap.put(unionInterface, new HashMap<Integer, Class<? extends MessageUnion>>(5));
}
unionmap.get(unionInterface).put(id, unionCase);
if (!tagmap.containsKey(unionInterface)) {
tagmap.put(unionInterface, new HashMap<Class<? extends MessageUnion>, Integer>(5));
}
tagmap.get(unionInterface).put(unionCase, id);
}
} catch (IOException e) {
throw new RuntimeException("could not read message map");
} finally {
maybeClose(in);
}
}
private static void maybeClose(Closeable in) {
try {
if (in != null) {
in.close();
}
} catch (IOException e) {
throw new RuntimeException("error closing stream: " + e.getMessage());
}
}
@SuppressWarnings("unchecked")
private static Class<? extends MessageUnion> loadClass(String className) {
ClassLoader cl = Thread.currentThread().getContextClassLoader();
Class<MessageUnion> msgClass;
try {
msgClass = (Class<MessageUnion>) cl.loadClass(className);
} catch (ClassNotFoundException e) {
throw new AssertionError(String.format("message class '%s' not found in classpath", className));
} catch (ClassCastException e) {
throw new AssertionError(String.format("Class %s does not inherit from MessageUnion", className));
}
return msgClass;
}
public static Class<? extends MessageUnion> getUnionClass(Class<? extends MessageUnion> unionInterface, int tag) {
Map<Integer, Class<? extends MessageUnion>> map = unionmap.get(unionInterface);
if (map == null) {
throw new UnknownUnionException("don't know how to handle unions of type '" + unionInterface + "'");
}
Class<? extends MessageUnion> cls = map.get(tag);
if (cls == null) {
throw new ProtocolViolationException("don't know how to translate message of type " + tag);
}
return cls;
}
public static int getUnionTag(Class<? extends MessageUnion> unionInterface, Class<? extends MessageUnion> unionCase) {
Map<Class<? extends MessageUnion>, Integer> map = tagmap.get(unionInterface);
if (map == null) {
throw new AssertionError(String.format("%s is not a known union type", unionInterface));
}
if (!map.containsKey(unionCase)) {
throw new AssertionError(String.format("%s is not a known instance of %s", unionCase, unionInterface));
}
return map.get(unionCase);
}
public static Class<? extends MessageUnion>[] getUnionCases(Class<? extends MessageUnion> unionInterface) {
Map<Class<? extends MessageUnion>, Integer> map = tagmap.get(unionInterface);
//noinspection unchecked
return (Class<? extends MessageUnion>[]) map.keySet().toArray(new Class[map.keySet().size()]);
}
public static void registerUnionCase(Class<? extends MessageUnion> unionInterface,
Class<? extends MessageUnion> unionCase, int tag) {
if (!unionmap.containsKey(unionInterface)) {
unionmap.put(unionInterface, new HashMap<Integer, Class<? extends MessageUnion>>(5));
}
unionmap.get(unionInterface).put(tag, unionCase);
if (!tagmap.containsKey(unionInterface)) {
tagmap.put(unionInterface, new HashMap<Class<? extends MessageUnion>, Integer>(5));
}
tagmap.get(unionInterface).put(unionCase, tag);
}
}
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