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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.List;
public class VariableSizeArrayParser implements Parser {
private final Field targetField;
private final Parser elemParser;
private ReflectUtil.NumField sizeField;
public VariableSizeArrayParser(final Parser elemParser, Field sizeField, Field arrayField) {
targetField = arrayField;
this.elemParser = elemParser;
this.sizeField = new ReflectUtil.NumField(sizeField);
}
@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(final ByteBuffer srcBuf, int frameOffset, Message frameObj, final Message dstObj, List<Field>
frameSizePath) {
final int elemNumber = (int) sizeField.get(dstObj);
@SuppressWarnings("unchecked")
final Class<Message> arrayElementType = (Class<Message>) targetField.getType().getComponentType();
int size = 0;
final Object arr = Array.newInstance(arrayElementType, elemNumber);
ReflectUtil.justSet(dstObj, targetField, arr);
for (int i = 0; i < elemNumber; ++i) {
Message elemObj;
elemObj = ReflectUtil.justInstantiate(arrayElementType);
Array.set(arr, i, elemObj);
size += elemParser.parse(srcBuf, frameOffset - size, null, elemObj, null);
}
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) {
int size = Array.getLength(ReflectUtil.justGet(m, targetField));
sizeField.set(m, size);
}
@Override
public int getStaticSize() {
return 0;
}
}
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