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Marshalling optimizations for the Eclipse Expressly implementation of the Jakarta Expression Language API.

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/*
 * Copyright The WildFly Authors
 * SPDX-License-Identifier: Apache-2.0
 */

package org.wildfly.clustering.el.expressly;

import java.io.IOException;

import org.glassfish.expressly.ValueExpressionLiteral;
import org.infinispan.protostream.descriptors.WireType;
import org.wildfly.clustering.marshalling.protostream.ProtoStreamMarshaller;
import org.wildfly.clustering.marshalling.protostream.ProtoStreamReader;
import org.wildfly.clustering.marshalling.protostream.ProtoStreamWriter;
import org.wildfly.clustering.marshalling.protostream.SimpleObjectOutput;

/**
 * {@link ProtoStreamMarshaller} for a {@link ValueExpressionLiteral}.
 * @author Paul Ferraro
 */
public class ValueExpressionLiteralMarshaller implements ProtoStreamMarshaller {

    private static final int VALUE_INDEX = 1;
    private static final int EXPECTED_TYPE_INDEX = 2;

    @Override
    public Class getJavaClass() {
        return ValueExpressionLiteral.class;
    }

    @Override
    public ValueExpressionLiteral readFrom(ProtoStreamReader reader) throws IOException {
        Object value = null;
        Class expectedType = null;
        while (!reader.isAtEnd()) {
            int tag = reader.readTag();
            switch (WireType.getTagFieldNumber(tag)) {
                case VALUE_INDEX:
                    value = reader.readAny();
                    break;
                case EXPECTED_TYPE_INDEX:
                    expectedType = reader.readAny(Class.class);
                    break;
                default:
                    reader.skipField(tag);
            }
        }
        return new ValueExpressionLiteral(value, expectedType);
    }

    @Override
    public void writeTo(ProtoStreamWriter writer, ValueExpressionLiteral literal) throws IOException {
        Object value = getValue(literal);
        if (value != null) {
            writer.writeAny(VALUE_INDEX, value);
        }
        Class expectedType = literal.getExpectedType();
        if (expectedType != null) {
            writer.writeAny(EXPECTED_TYPE_INDEX, expectedType);
        }
    }

    private static Object getValue(ValueExpressionLiteral literal) throws IOException {
        if (literal.getExpectedType() == null) {
            return literal.getValue(null);
        }
        Object[] objects = new Object[1];
        literal.writeExternal(new SimpleObjectOutput.Builder().with(objects).build());
        return objects[0];
    }
}