proton-j/src/main/java/org/apache/qpid/proton/codec/impl/IntegerElement.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.qpid.proton.codec.impl;

import java.nio.ByteBuffer;

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

class IntegerElement extends AtomicElement<Integer>
{

    private final int _value;

    IntegerElement(Element parent, Element prev, int i)
    {
        super(parent, prev);
        _value = i;
    }

    @Override
    public int size()
    {
        if(isElementOfArray())
        {
            final ArrayElement parent = (ArrayElement) parent();
            if(parent.constructorType() == ArrayElement.SMALL)
            {
                if(-128 <= _value && _value <= 127)
                {
                    return 1;
                }
                else
                {
                    parent.setConstructorType(ArrayElement.LARGE);
                    return 4;
                }
            }
            else
            {
                return 4;
            }
        }
        else
        {
            return (-128 <= _value && _value <= 127) ? 2 : 5;
        }

    }

    @Override
    public Integer getValue()
    {
        return _value;
    }

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

    @Override
    public int encode(ByteBuffer b)
    {
        int size = size();
        if(size <= b.remaining())
        {
            switch(size)
            {
                case 2:
                    b.put((byte)0x54);
                case 1:
                    b.put((byte)_value);
                    break;

                case 5:
                    b.put((byte)0x71);
                case 4:
                    b.putInt(_value);

            }

            return size;
        }
        return 0;
    }
}