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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.ReflectUtil;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
/**
* Parse an array that takes up all the available space.
*
* @author Florian Dold
*/
public class FillParser implements Parser {
private final Parser elemParser;
private final Field targetField;
public FillParser(Parser p, Field field) {
targetField = field;
elemParser = p;
}
@Override
public int getSize(final Message src) {
int size = 0;
final Object arr = ReflectUtil.justGet(src, targetField);
if (arr == null) {
throw new RuntimeException("array not initialized");
}
for (int i = 0; i < Array.getLength(arr); ++i) {
size += elemParser.getSize((Message) Array.get(arr, i));
}
return size;
}
@Override
public int parse(ByteBuffer srcBuf, int frameOffset,
Message frameObj, final Message dstObj, List<Field> frameSizePath) {
if (frameSizePath == null) {
throw new AssertionError("FillParser expects a non-null frameSizePath. Does the message have a @FrameSizePath annotation?");
}
final int frameSize = ReflectUtil.justGetInt(dstObj, frameSizePath);
int remaining = frameOffset + frameSize - srcBuf.position();
int size = 0;
Class<?> elemType = targetField.getType().getComponentType();
ArrayList<Message> list = new ArrayList<Message>(10);
while (remaining > 0) {
@SuppressWarnings("unchecked")
Message next = ReflectUtil.justInstantiate((Class<Message>) targetField.getType().getComponentType());
int s = elemParser.parse(srcBuf, frameOffset, frameObj, next, null);
size += s;
remaining -= s;
list.add(next);
}
Object arr = Array.newInstance(elemType, list.size());
try {
targetField.set(dstObj, list.toArray((Object[]) arr));
} catch (IllegalAccessException e) {
throw new AssertionError("cannot access field");
}
return size;
}
@Override
public int write(final ByteBuffer dstBuf, final Message src) {
int size = 0;
final Object arr = ReflectUtil.justGet(src, targetField);
for (int i = 0; i < Array.getLength(arr); ++i) {
size += elemParser.write(dstBuf, (Message) Array.get(arr, i));
}
return size;
}
@Override
public void patch(Message m, int frameSize, List<Field> frameSizePath, Message frameObj) {
if (frameSizePath == null) {
throw new AssertionError();
}
ReflectUtil.justSetInt(frameObj, frameSizePath, frameSize);
// todo: patch nested messages
}
@Override
public int getStaticSize() {
// not known
return 0;
}
}
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