Java tutorial
/* * Copyright (c) 2013 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.pcep.ietf.stateful07; import static org.opendaylight.protocol.util.ByteBufWriteUtil.writeMedium; import com.google.common.base.Preconditions; import com.google.common.primitives.UnsignedBytes; import io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; import java.util.List; import org.opendaylight.protocol.pcep.spi.AbstractObjectWithTlvsParser; import org.opendaylight.protocol.pcep.spi.ObjectUtil; import org.opendaylight.protocol.pcep.spi.PCEPDeserializerException; import org.opendaylight.protocol.pcep.spi.TlvRegistry; import org.opendaylight.protocol.pcep.spi.VendorInformationTlvRegistry; import org.opendaylight.protocol.util.BitArray; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.OperationalStatus; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.PlspId; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.lsp.error.code.tlv.LspErrorCode; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.lsp.identifiers.tlv.LspIdentifiers; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.lsp.object.Lsp; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.lsp.object.LspBuilder; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.lsp.object.lsp.Tlvs; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.lsp.object.lsp.TlvsBuilder; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.path.binding.tlv.PathBinding; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.rsvp.error.spec.tlv.RsvpErrorSpec; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.symbolic.path.name.tlv.SymbolicPathName; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.Object; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.ObjectHeader; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.Tlv; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.vendor.information.tlvs.VendorInformationTlv; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.vs.tlv.VsTlv; /** * Parser for {@link Lsp} */ public class Stateful07LspObjectParser extends AbstractObjectWithTlvsParser<TlvsBuilder> { public static final int CLASS = 32; public static final int TYPE = 1; /* * 12b extended to 16b so first 4b are restricted (belongs to LSP ID) */ protected static final int DELEGATE = 11; protected static final int SYNC = 10; protected static final int REMOVE = 9; protected static final int ADMINISTRATIVE = 8; protected static final int OPERATIONAL = 5; protected static final int FOUR_BITS_SHIFT = 4; protected static final int FLAGS_SIZE = 12; public Stateful07LspObjectParser(final TlvRegistry tlvReg, final VendorInformationTlvRegistry viTlvReg) { super(tlvReg, viTlvReg); } @Override public Lsp parseObject(final ObjectHeader header, final ByteBuf bytes) throws PCEPDeserializerException { Preconditions.checkArgument(bytes != null && bytes.isReadable(), "Array of bytes is mandatory. Can't be null or empty."); final LspBuilder builder = new LspBuilder(); builder.setIgnore(header.isIgnore()); builder.setProcessingRule(header.isProcessingRule()); final int[] plspIdRaw = new int[] { bytes.readUnsignedByte(), bytes.readUnsignedByte(), bytes.getUnsignedByte(2), }; builder.setPlspId(new PlspId((long) ((plspIdRaw[0] << FLAGS_SIZE) | (plspIdRaw[1] << FOUR_BITS_SHIFT) | (plspIdRaw[2] >> FOUR_BITS_SHIFT)))); parseFlags(builder, bytes); final TlvsBuilder b = new TlvsBuilder(); parseTlvs(b, bytes.slice()); builder.setTlvs(b.build()); return builder.build(); } protected void parseFlags(final LspBuilder builder, final ByteBuf bytes) { final BitArray flags = BitArray.valueOf(bytes, FLAGS_SIZE); builder.setDelegate(flags.get(DELEGATE)); builder.setSync(flags.get(SYNC)); builder.setRemove(flags.get(REMOVE)); builder.setAdministrative(flags.get(ADMINISTRATIVE)); short s = 0; s |= flags.get(OPERATIONAL + 2) ? 1 : 0; s |= (flags.get(OPERATIONAL + 1) ? 1 : 0) << 1; s |= (flags.get(OPERATIONAL) ? 1 : 0) << 2; builder.setOperational(OperationalStatus.forValue(s)); } @Override public void addTlv(final TlvsBuilder builder, final Tlv tlv) { if (tlv instanceof LspErrorCode) { builder.setLspErrorCode((LspErrorCode) tlv); } else if (tlv instanceof LspIdentifiers) { builder.setLspIdentifiers((LspIdentifiers) tlv); } else if (tlv instanceof RsvpErrorSpec) { builder.setRsvpErrorSpec((RsvpErrorSpec) tlv); } else if (tlv instanceof SymbolicPathName) { builder.setSymbolicPathName((SymbolicPathName) tlv); } else if (tlv instanceof VsTlv) { builder.setVsTlv((VsTlv) tlv); } else if (tlv instanceof PathBinding) { builder.setPathBinding((PathBinding) tlv); } } @Override public void serializeObject(final Object object, final ByteBuf buffer) { Preconditions.checkArgument(object instanceof Lsp, "Wrong instance of PCEPObject. Passed %s . Needed LspObject.", object.getClass()); final Lsp specObj = (Lsp) object; final ByteBuf body = Unpooled.buffer(); Preconditions.checkArgument(specObj.getPlspId() != null, "PLSP-ID not present"); writeMedium(specObj.getPlspId().getValue().intValue() << FOUR_BITS_SHIFT, body); final BitArray flags = serializeFlags(specObj); byte op = 0; if (specObj.getOperational() != null) { op = UnsignedBytes.checkedCast(specObj.getOperational().getIntValue()); op = (byte) (op << FOUR_BITS_SHIFT); } final byte[] res = flags.array(); res[res.length - 1] = (byte) (res[res.length - 1] | op); body.writeByte(res[res.length - 1]); serializeTlvs(specObj.getTlvs(), body); ObjectUtil.formatSubobject(TYPE, CLASS, object.isProcessingRule(), object.isIgnore(), body, buffer); } protected BitArray serializeFlags(final Lsp specObj) { final BitArray flags = new BitArray(FLAGS_SIZE); flags.set(DELEGATE, specObj.isDelegate()); flags.set(REMOVE, specObj.isRemove()); flags.set(SYNC, specObj.isSync()); flags.set(ADMINISTRATIVE, specObj.isAdministrative()); return flags; } public void serializeTlvs(final Tlvs tlvs, final ByteBuf body) { if (tlvs == null) { return; } if (tlvs.getLspErrorCode() != null) { serializeTlv(tlvs.getLspErrorCode(), body); } if (tlvs.getLspIdentifiers() != null) { serializeTlv(tlvs.getLspIdentifiers(), body); } if (tlvs.getRsvpErrorSpec() != null) { serializeTlv(tlvs.getRsvpErrorSpec(), body); } if (tlvs.getSymbolicPathName() != null) { serializeTlv(tlvs.getSymbolicPathName(), body); } if (tlvs.getVsTlv() != null) { serializeTlv(tlvs.getVsTlv(), body); } serializeVendorInformationTlvs(tlvs.getVendorInformationTlv(), body); if (tlvs.getPathBinding() != null) { serializeTlv(tlvs.getPathBinding(), body); } } @Override protected final void addVendorInformationTlvs(final TlvsBuilder builder, final List<VendorInformationTlv> tlvs) { if (!tlvs.isEmpty()) { builder.setVendorInformationTlv(tlvs); } } }