/*
* Copyright (c) 2013 Pantheon Technologies s.r.o. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.openflowjava.protocol.impl.deserialization.factories;
import io.netty.buffer.ByteBuf;
import java.util.ArrayList;
import java.util.List;
import org.opendaylight.openflowjava.protocol.api.extensibility.OFDeserializer;
import org.opendaylight.openflowjava.protocol.api.util.EncodeConstants;
import org.opendaylight.openflowjava.protocol.impl.util.VersionAssignableFactory;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.common.types.rev130731.HelloElementType;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.HelloMessage;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.HelloMessageBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.hello.Elements;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.hello.ElementsBuilder;
/**
* Translates Hello messages.
* OF protocol versions: 1.3, 1.4, 1.5.
* @author michal.polkorab
* @author timotej.kubas
*/
public class HelloMessageFactory extends VersionAssignableFactory implements OFDeserializer<HelloMessage> {
private static final byte HELLO_ELEMENT_HEADER_SIZE = 4;
@Override
public HelloMessage deserialize(ByteBuf rawMessage) {
HelloMessageBuilder builder = new HelloMessageBuilder();
builder.setVersion(getVersion());
builder.setXid(rawMessage.readUnsignedInt());
if (rawMessage.readableBytes() > 0) {
builder.setElements(readElement(rawMessage));
}
return builder.build();
}
private static List<Elements> readElement(ByteBuf input) {
List<Elements> elementsList = new ArrayList<>();
while (input.readableBytes() > 0) {
ElementsBuilder elementsBuilder = new ElementsBuilder();
int type = input.readUnsignedShort();
int elementLength = input.readUnsignedShort();
if (type == HelloElementType.VERSIONBITMAP.getIntValue()) {
elementsBuilder.setType(HelloElementType.forValue(type));
int[] versionBitmap = new int[(elementLength - HELLO_ELEMENT_HEADER_SIZE) / 4];
for (int i = 0; i < versionBitmap.length; i++) {
versionBitmap[i] = (int) input.readUnsignedInt();
}
elementsBuilder.setVersionBitmap(readVersionBitmap(versionBitmap));
int paddingRemainder = elementLength % EncodeConstants.PADDING;
if (paddingRemainder != 0) {
input.readBytes(EncodeConstants.PADDING - paddingRemainder);
}
} else {
return elementsList;
}
elementsList.add(elementsBuilder.build());
}
return elementsList;
}
private static List<Boolean> readVersionBitmap(int[] input){
List<Boolean> versionBitmapList = new ArrayList<>();
for (int i = 0; i < input.length; i++) {
int mask = input[i];
for (int j = 0; j < Integer.SIZE; j++) {
versionBitmapList.add((mask & (1 << j)) != 0);
}
}
return versionBitmapList;
}
}