common/src/org/apache/qpid/framing/AMQDataBlock.java


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/*
 *
 * Copyright (c) 2006 The Apache Software Foundation
 *
 * Licensed 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.framing;

import org.apache.mina.common.ByteBuffer;

/**
 * A data block represents something that has a size in bytes and the ability to write itself to a byte
 * buffer (similar to a byte array).
 */
public abstract class AMQDataBlock implements EncodableAMQDataBlock
{
    /**
     * Get the size of buffer needed to store the byte representation of this
     * frame.
     * @return unsigned integer
     */
    public abstract long getSize();

    /**
     * Writes the datablock to the specified buffer.
     * @param buffer
     */
    public abstract void writePayload(ByteBuffer buffer);
}