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/*
This file is part of GNUnet.
Copyright (C) 2014 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 3, 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.gns;
import com.google.common.collect.BiMap;
import com.google.common.collect.HashBiMap;
import com.google.common.collect.Maps;
import org.gnunet.construct.*;
import org.gnunet.gns.records.RecordData;
import org.gnunet.gns.records.UnknownRecordData;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;
/**
* A GNS record.
*/
public class GnsRecord implements Message {
private static final Logger logger = LoggerFactory
.getLogger(GnsRecord.class);
private static boolean registryInitialized;
private static BiMap<String,Long> recordTypeMap = HashBiMap.create();
private static Map<Long,Class> recordClassMap = Maps.newHashMap();
/**
* Expiration, either absolute or relative time depending on 'flags'.
*/
@UInt64
public long expiration;
/**
* Size of 'recordDataBytes'.
*/
@UInt32
public long dataSize;
/**
* Type ID of this record.
*/
@UInt32
public long recordType;
@UInt32
public long flags;
@VariableSizeIntegerArray(lengthField = "dataSize", signed = true, bitSize = 8)
public byte[] recordDataBytes;
public static void initializeRegistry() {
if (registryInitialized)
return;
Class<?>[] classes = MessageLoader.getUnionCases(RecordData.class);
for (Class<?> aClass : classes) {
String recordTypeString;
try {
Field field = aClass.getField("recordTypeString");
recordTypeString = (String) field.get(null);
} catch (NoSuchFieldException e) {
logger.warn("RecordData class {} has no recordTypeString field");
continue;
} catch (IllegalAccessException e) {
logger.warn("RecordData class {} can't access recordTypeString field");
continue;
}
long recordTypeId = MessageLoader.getUnionTag(RecordData.class, (Class<? extends MessageUnion>) aClass);
recordTypeMap.put(recordTypeString, recordTypeId);
recordClassMap.put(recordTypeId, aClass);
}
registryInitialized = true;
}
public RecordData getRecordData() {
initializeRegistry();
Class cls = recordClassMap.get(recordType);
if (null == cls) {
UnknownRecordData unknownRecordData = new UnknownRecordData();
unknownRecordData.data = recordDataBytes;
}
return (RecordData) Construct.parseAs(recordDataBytes, cls);
}
public static GnsRecord createFromString(String typeString, String content) {
long typeId = getIdFromString(typeString);
if (typeId < 0)
return null;
return createFromString(typeId, content);
}
public static GnsRecord createFromString(long typeId, String content) {
initializeRegistry();
Class cls = recordClassMap.get(typeId);
if (null == cls) {
return null;
}
Method mth;
try {
mth = cls.getMethod("createFromString", String.class);
} catch (NoSuchMethodException e) {
return null;
}
try {
return (GnsRecord) mth.invoke(null, content);
} catch (IllegalAccessException e) {
return null;
} catch (InvocationTargetException e) {
return null;
}
}
public static String getStringFromId(long typeId) {
initializeRegistry();
if (!recordTypeMap.inverse().containsKey(typeId)) {
return null;
}
return recordTypeMap.inverse().get(typeId);
}
public static long getIdFromString(String typeString) {
initializeRegistry();
if (!recordTypeMap.containsKey(typeString)) {
return -1;
}
return recordTypeMap.get(typeString);
}
}
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