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BGP Parser SPI
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/*
 * 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.bgp.parser.spi;

import io.netty.buffer.ByteBuf;
import org.eclipse.jdt.annotation.NonNull;
import org.eclipse.jdt.annotation.Nullable;
import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
import org.opendaylight.protocol.bgp.parser.BGPError;
import org.opendaylight.protocol.bgp.parser.BGPParsingException;
import org.opendaylight.protocol.bgp.parser.BGPTreatAsWithdrawException;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev200120.path.attributes.AttributesBuilder;

/**
 * Common interface for attribute parser implementation. Implementations should consider deriving from
 * {@link AbstractAttributeParser} and provide an RFC7606-compliant interface.
 */
public interface AttributeParser {
    /**
     * Parses attribute from ByteBuf buffer.
     *
     * @param buffer Encoded attribute body in ByteBuf.
     * @param builder Path attributes builder. Guaranteed to contain all valid attributes whose type is numerically
     *        lower than this attribute's type.
     * @param constraint Peer specific constraints, may be null
     * @throws BGPDocumentedException when an irrecoverable error occurred which has a {@link BGPError} assigned
     * @throws BGPParsingException when a general unspecified parsing error occurs.
     */
    void parseAttribute(@NonNull ByteBuf buffer, @NonNull AttributesBuilder builder,
            @Nullable PeerSpecificParserConstraint constraint) throws BGPDocumentedException, BGPParsingException;

    /**
     * Parses attribute from ByteBuf buffer with the specified {@link RevisedErrorHandling}. Default implementation
     * ignores error handling and defers to
     * {@link #parseAttribute(ByteBuf, AttributesBuilder, PeerSpecificParserConstraint)}.
     *
     * @param buffer Encoded attribute body in ByteBuf.
     * @param builder Path attributes builder. Guaranteed to contain all valid attributes whose type is numerically
     *        lower than this attribute's type.
     * @param errorHandling RFC7606 error handling type
     * @param constraint Peer specific constraints, may be null
     * @throws BGPDocumentedException when an irrecoverable error occurred which has a {@link BGPError} assigned
     * @throws BGPParsingException when a general unspecified parsing error occurs.
     * @throws BGPTreatAsWithdrawException when parsing according to revised error handling indicates the
     *                                              message should be treated as withdraw.
     */
    default void parseAttribute(final @NonNull ByteBuf buffer, final @NonNull AttributesBuilder builder,
            final @NonNull RevisedErrorHandling errorHandling, final @Nullable PeerSpecificParserConstraint constraint)
                    throws BGPDocumentedException, BGPParsingException, BGPTreatAsWithdrawException {
        parseAttribute(buffer, builder, constraint);
    }

    /**
     * Determine whether a duplicate attribute should be ignored or {@link BGPError#MALFORMED_ATTR_LIST} should be
     * raised. This is useful for MP_REACH/MP_UNREACH attributes, which need to emit a Notification under RFC7606
     * rules.
     *
     * @param errorHandling Revised error handling type
     * @return True if the duplicate attribute should be ignored, false if a BGPError should be raised.
     */
    default boolean ignoreDuplicates(final @NonNull RevisedErrorHandling errorHandling) {
        return true;
    }
}