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Access to the Neo4j graph database through Java

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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.neo4j.driver.internal.messaging;

import java.io.IOException;
import java.util.Map;

import static java.util.Objects.requireNonNull;

public abstract class AbstractMessageWriter implements MessageFormat.Writer
{
    private final ValuePacker packer;
    private final Map encodersByMessageSignature;

    protected AbstractMessageWriter( ValuePacker packer, Map encodersByMessageSignature )
    {
        this.packer = requireNonNull( packer );
        this.encodersByMessageSignature = requireNonNull( encodersByMessageSignature );
    }

    @Override
    public final void write( Message msg ) throws IOException
    {
        byte signature = msg.signature();
        MessageEncoder encoder = encodersByMessageSignature.get( signature );
        if ( encoder == null )
        {
            throw new IOException( "No encoder found for message " + msg + " with signature " + signature );
        }
        encoder.encode( msg, packer );
    }
}