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The core of Neo4j Bolt Protocol, this contains the state machine for Bolt sessions.
There is a newer version: 5.26.1
/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [https://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.packstream.struct;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;

public abstract class AbstractStructRegistry implements StructRegistry {
    protected final Map> tagToReaderMap;
    protected final Map, StructWriter> typeToWriterMap;

    public AbstractStructRegistry(
            Map> tagToReaderMap,
            Map, StructWriter> typeToWriterMap) {
        this.tagToReaderMap = tagToReaderMap;
        this.typeToWriterMap = typeToWriterMap;
    }

    @Override
    @SuppressWarnings({"unchecked", "rawtypes"})
    public  StructRegistry.Builder builderOf() {
        return StructRegistry.builder()
                .registerReaders((Map) this.tagToReaderMap)
                .registerWriters(this.typeToWriterMap);
    }

    @Override
    public Optional> getReader(StructHeader header) {
        return Optional.ofNullable(this.tagToReaderMap.get(header.tag()));
    }

    @Override
    @SuppressWarnings("unchecked")
    public  Optional> getWriter(O payload) {
        var payloadType = payload.getClass();

        var directMatch = (StructWriter) this.typeToWriterMap.get(payloadType);
        if (directMatch != null) {
            return Optional.of(directMatch);
        }

        return this.typeToWriterMap.entrySet().stream()
                .filter(entry -> entry.getKey().isAssignableFrom(payloadType))
                .map(entry -> (StructWriter) entry.getValue())
                .findAny();
    }

    public abstract static class Builder implements StructRegistry.Builder {
        protected final Map> tagToReaderMap;
        protected final Map, StructWriter> typeToWriterMap;

        protected Builder() {
            this(Collections.emptyMap(), Collections.emptyMap());
        }

        protected Builder(
                Map> tagToReaderMap,
                Map, StructWriter> typeToWriterMap) {
            this.tagToReaderMap = new HashMap<>(tagToReaderMap);
            this.typeToWriterMap = new HashMap<>(typeToWriterMap);
        }

        @Override
        public StructRegistry.Builder register(short tag, StructReader reader) {
            this.tagToReaderMap.put(tag, reader);
            return this;
        }

        @Override
        public StructRegistry.Builder unregisterReader(short tag) {
            this.tagToReaderMap.remove(tag);
            return this;
        }

        @Override
        public  StructRegistry.Builder unregisterWriter(Class type) {
            this.typeToWriterMap.remove(type);
            return this;
        }

        @Override
        @SuppressWarnings("unchecked")
        public  StructRegistry.Builder register(
                Class type, StructWriter writer) {
            this.typeToWriterMap.put(type, (StructWriter) writer);
            return this;
        }
    }
}