gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/binary/types/LambdaSerializer.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.tinkerpop.gremlin.structure.io.binary.types;

import org.apache.tinkerpop.gremlin.structure.io.binary.DataType;
import org.apache.tinkerpop.gremlin.structure.io.binary.GraphBinaryReader;
import org.apache.tinkerpop.gremlin.structure.io.binary.GraphBinaryWriter;
import org.apache.tinkerpop.gremlin.structure.io.Buffer;
import org.apache.tinkerpop.gremlin.util.function.Lambda;

import java.io.IOException;

/**
 * @author Stephen Mallette (http://stephen.genoprime.com)
 */
public class LambdaSerializer extends SimpleTypeSerializer<Lambda> {
    public LambdaSerializer() {
        super(DataType.LAMBDA);
    }

    @Override
    protected Lambda readValue(final Buffer buffer, final GraphBinaryReader context) throws IOException {
        final String lang = context.readValue(buffer, String.class, false);
        final String script = context.readValue(buffer, String.class, false);
        final int args = context.readValue(buffer, Integer.class, false);

        if (0 == args)
            return new Lambda.ZeroArgLambda<>(script, lang);
        else if (1 == args)
            return new Lambda.OneArgLambda<>(script, lang);
        else if (2 == args)
            return new Lambda.TwoArgLambda<>(script, lang);
        else
            return new Lambda.UnknownArgLambda(script, lang, args);
    }

    @Override
    protected void writeValue(final Lambda value, final Buffer buffer, final GraphBinaryWriter context) throws IOException {
        context.writeValue(value.getLambdaLanguage(), buffer, false);
        context.writeValue(value.getLambdaScript(), buffer, false);
        context.writeValue(value.getLambdaArguments(), buffer, false);
    }
}