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    • org.wildfly.clustering.marshalling.protostream.PackedArrayMarshaller Maven / Gradle / Ivy

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

package org.wildfly.clustering.marshalling.protostream;

import java.io.IOException;
import java.lang.reflect.Array;

import org.infinispan.protostream.descriptors.WireType;

/**
 * Marshaller for packed repeated fields, e.g. primitive arrays.
 * See https://developers.google.com/protocol-buffers/docs/encoding?hl=id#packed
 * @author Paul Ferraro
 * @param  the component type of this marshaller
 */
public class PackedArrayMarshaller implements ScalarMarshaller {

    private final Class componentType;
    private final ScalarMarshaller element;
    private final Class arrayClass;

    public PackedArrayMarshaller(Class componentType, ScalarMarshaller element) {
        this.componentType = componentType;
        this.element = element;
        this.arrayClass = Array.newInstance(this.componentType, 0).getClass();
    }

    @Override
    public Object readFrom(ProtoStreamReader reader) throws IOException {
        int length = reader.readUInt32();
        Object array = Array.newInstance(this.componentType, length);
        for (int i = 0; i < length; ++i) {
            Object element = this.element.readFrom(reader);
            Array.set(array, i, element);
        }
        return array;
    }

    @Override
    public void writeTo(ProtoStreamWriter writer, Object array) throws IOException {
        int length = Array.getLength(array);
        writer.writeVarint32(length);
        for (int i = 0; i < length; ++i) {
            @SuppressWarnings("unchecked")
            T element = (T) Array.get(array, i);
            this.element.writeTo(writer, element);
        }
    }

    @Override
    public Class getJavaClass() {
        return this.arrayClass;
    }

    @Override
    public WireType getWireType() {
        return WireType.LENGTH_DELIMITED;
    }
}
    
    
    
    

    




    
    
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