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.impl.subobject; import com.google.common.base.Preconditions; import io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; import org.opendaylight.protocol.pcep.spi.EROSubobjectParser; import org.opendaylight.protocol.pcep.spi.EROSubobjectSerializer; import org.opendaylight.protocol.pcep.spi.EROSubobjectUtil; import org.opendaylight.protocol.pcep.spi.LabelRegistry; import org.opendaylight.protocol.pcep.spi.PCEPDeserializerException; import org.opendaylight.protocol.util.BitArray; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.explicit.route.object.ero.Subobject; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.explicit.route.object.ero.SubobjectBuilder; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.basic.explicit.route.subobjects.subobject.type.LabelCase; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.basic.explicit.route.subobjects.subobject.type.LabelCaseBuilder; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.basic.explicit.route.subobjects.subobject.type.label._case.Label; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.basic.explicit.route.subobjects.subobject.type.label._case.LabelBuilder; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.label.subobject.LabelType; public class EROLabelSubobjectParser implements EROSubobjectParser, EROSubobjectSerializer { public static final int TYPE = 3; private static final int FLAGS_SIZE = 8; private static final int C_TYPE_F_LENGTH = 1; private static final int C_TYPE_F_OFFSET = FLAGS_SIZE / Byte.SIZE; private static final int HEADER_LENGTH = C_TYPE_F_OFFSET + C_TYPE_F_LENGTH; private static final int U_FLAG_OFFSET = 0; private final LabelRegistry registry; public EROLabelSubobjectParser(final LabelRegistry labelReg) { this.registry = Preconditions.checkNotNull(labelReg); } @Override public Subobject parseSubobject(final ByteBuf buffer, final boolean loose) throws PCEPDeserializerException { Preconditions.checkArgument(buffer != null && buffer.isReadable(), "Array of bytes is mandatory. Can't be null or empty."); if (buffer.readableBytes() < HEADER_LENGTH) { throw new PCEPDeserializerException("Wrong length of array of bytes. Passed: " + buffer.readableBytes() + "; Expected: >" + HEADER_LENGTH + "."); } final BitArray reserved = BitArray.valueOf(buffer, FLAGS_SIZE); final short cType = buffer.readUnsignedByte(); final LabelType labelType = this.registry.parseLabel(cType, buffer.slice()); if (labelType == null) { throw new PCEPDeserializerException("Unknown C-TYPE for ero label subobject. Passed: " + cType); } final LabelBuilder builder = new LabelBuilder(); builder.setUniDirectional(reserved.get(U_FLAG_OFFSET)); builder.setLabelType(labelType); return new SubobjectBuilder().setLoose(loose) .setSubobjectType(new LabelCaseBuilder().setLabel(builder.build()).build()).build(); } @Override public void serializeSubobject(final Subobject subobject, final ByteBuf buffer) { Preconditions.checkArgument(subobject.getSubobjectType() instanceof LabelCase, "Unknown subobject instance. Passed %s. Needed LabelCase.", subobject.getSubobjectType().getClass()); final Label label = ((LabelCase) subobject.getSubobjectType()).getLabel(); final ByteBuf body = Unpooled.buffer(); this.registry.serializeLabel(label.isUniDirectional(), false, label.getLabelType(), body); EROSubobjectUtil.formatSubobject(TYPE, subobject.isLoose(), body, buffer); } }