org.apache.qpid.proton.codec.impl.NullElement Maven / Gradle / Ivy

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/*
 *
 * 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.qpid.proton.codec.impl;

import java.nio.ByteBuffer;

import org.apache.qpid.proton.codec.Data;

class NullElement extends AtomicElement
{
    NullElement(Element parent, Element prev)
    {
        super(parent, prev);
    }

    @Override
    public int size()
    {
        return isElementOfArray() ? 0 : 1;
    }

    @Override
    public Void getValue()
    {
        return null;
    }

    @Override
    public Data.DataType getDataType()
    {
        return Data.DataType.NULL;
    }

    @Override
    public int encode(ByteBuffer b)
    {
        if(b.hasRemaining() && !isElementOfArray())
        {
            b.put((byte)0x40);
            return 1;
        }
        return 0;
    }
}