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/*
This file is part of GNUnet.
Copyright (C) 2011, 2012 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.construct.parsers;
import org.gnunet.construct.Message;
import org.gnunet.construct.ProtocolViolationException;
import org.gnunet.construct.ReflectUtil;
import java.lang.reflect.Field;
import java.nio.ByteBuffer;
import java.util.List;
public class NestedParser implements Parser {
private final Field targetField;
private final Parser nestedParser;
private boolean newFrame;
boolean optional;
public NestedParser(final Parser p, boolean optional, final Field f, boolean newFrame) {
targetField = f;
this.optional = optional;
this.nestedParser = p;
this.newFrame = newFrame;
}
@Override
public int getSize(final Message src) {
Message inner = (Message) ReflectUtil.justGet(src, targetField);
if (inner == null) {
if (optional)
return 0;
throw new AssertionError(String.format("empty non-optional nested message in field '%s'", targetField));
}
return nestedParser.getSize(inner);
}
@Override
public int parse(final ByteBuffer srcBuf, int frameOffset, Message frameObj, final Message dstObj, List<Field>
frameSizePath) {
if (newFrame) {
frameObj = dstObj;
frameOffset = 0;
}
if (optional) {
if (frameSizePath == null) {
throw new AssertionError("optional nested message needs @FrameSize");
}
int remaining = frameOffset + ReflectUtil.justGetInt(frameObj, frameSizePath) - srcBuf.position();
if (remaining < 0) {
throw new ProtocolViolationException("remaining size negative");
}
if (remaining == 0) {
if (!optional) {
throw new ProtocolViolationException("not optional");
}
ReflectUtil.justSet(dstObj, targetField, null);
return 0;
}
}
if (targetField.getType().isInterface()) {
throw new AssertionError(String.format("Target field '%s' is an interface, not a class.", targetField));
}
ReflectUtil.justSet(dstObj, targetField, ReflectUtil.justInstantiate(targetField.getType()));
try {
return nestedParser.parse(srcBuf, frameOffset,
frameObj, (Message) ReflectUtil.justGet(dstObj, targetField), frameSizePath);
} catch (ProtocolViolationException e) {
throw e.augmentPath("nested parser on " + targetField.toString());
}
}
@Override
public int write(final ByteBuffer dstBuf, final Message src) {
Object nestedMessage = ReflectUtil.justGet(src, targetField);
if (nestedMessage == null) {
return 0;
}
return nestedParser.write(dstBuf, (Message) nestedMessage);
}
@Override
public void patch(Message m, int frameSize, List<Field> frameSizePath, Message frameObj) {
Message nestedMessage = (Message) ReflectUtil.justGet(m, targetField);
if (newFrame) {
nestedParser.patch(nestedMessage, nestedParser.getSize(nestedMessage), null, nestedMessage);
} else {
nestedParser.patch(nestedMessage, frameSize, frameSizePath, frameObj);
}
}
@Override
public int getStaticSize() {
return nestedParser.getStaticSize();
}
}
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