Java tutorial
/* * Copyright (c) 2015 Cisco Systems, Inc. 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.protocol.rsvp.parser.spi.subobjects; import com.google.common.base.Preconditions; import com.google.common.primitives.UnsignedBytes; import io.netty.buffer.ByteBuf; import io.netty.buffer.ByteBufUtil; import java.util.ArrayList; import java.util.List; import org.opendaylight.protocol.rsvp.parser.spi.RSVPParsingException; import org.opendaylight.protocol.rsvp.parser.spi.XROSubobjectRegistry; import org.opendaylight.protocol.util.Values; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.exclude.route.object.exclude.route.object.SubobjectContainer; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public abstract class XROSubobjectListParser extends AbstractRSVPObjectParser { private static final Logger LOG = LoggerFactory.getLogger(XROSubobjectListParser.class); private static final short HEADER_LENGHT = 2; private final XROSubobjectRegistry subobjReg; protected XROSubobjectListParser(final XROSubobjectRegistry subobjReg) { this.subobjReg = Preconditions.checkNotNull(subobjReg); } public List<SubobjectContainer> parseList(final ByteBuf byteBuf) throws RSVPParsingException { final List<SubobjectContainer> subs = new ArrayList<>(); while (byteBuf.isReadable()) { final boolean mandatory = ((byteBuf.getUnsignedByte(byteBuf.readerIndex()) & (1 << Values.FIRST_BIT_OFFSET)) != 0) ? true : false; final int type = UnsignedBytes.checkedCast( (byteBuf.readUnsignedByte() & Values.BYTE_MAX_VALUE_BYTES) & ~(1 << Values.FIRST_BIT_OFFSET)); final int length = byteBuf.readUnsignedByte() - HEADER_LENGHT; if (length > byteBuf.readableBytes()) { throw new RSVPParsingException( "Wrong length specified. Passed: " + length + "; Expected: <= " + byteBuf.readableBytes()); } LOG.debug("Attempt to parse subobject from bytes: {}", ByteBufUtil.hexDump(byteBuf)); final SubobjectContainer sub = this.subobjReg.parseSubobject(type, byteBuf.readSlice(length), mandatory); if (sub == null) { LOG.warn("Unknown subobject type: {}. Ignoring subobject.", type); } else { LOG.debug("Subobject was parsed. {}", sub); subs.add(sub); } } return subs; } public void serializeList(final List<SubobjectContainer> subobjects, final ByteBuf buffer) { Preconditions.checkArgument(subobjects != null && !subobjects.isEmpty(), "XRO must contain at least one subobject."); for (final SubobjectContainer subobject : subobjects) { this.subobjReg.serializeSubobject(subobject, buffer); } } }