bytearray.java

mina是以Java实现的一个开源的网络程序框架

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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.mina.util.byteaccess;


import java.nio.ByteOrder;

import org.apache.mina.core.buffer.IoBuffer;


/**
 * Represents a sequence of bytes that can be read or written directly or
 * through a cursor.
 * 
 * @author The Apache MINA Project ([e-mail])
 * @version $Rev$, $Date$
 */
public interface ByteArray extends IoAbsoluteReader, IoAbsoluteWriter
{

    /**
     * @inheritDoc
     */
    int first();


    /**
     * @inheritDoc
     */
    int last();


    /**
     * @inheritDoc
     */
    ByteOrder order();


    /**
     * Set the byte order of the array.
     */
    void order( ByteOrder order );


    /**
     * Remove any resources associated with this object. Using the object after
     * this method is called may result in undefined behaviour.
     */
    void free();


    /**
     * Get the sequence of <code>IoBuffer</code>s that back this array.
     * Compared to <code>getSingleIoBuffer()</code>, this method should be
     * relatively efficient for all implementations.
     */
    Iterable<IoBuffer> getIoBuffers();


    /**
     * Gets a single <code>IoBuffer</code> that backs this array. Some
     * implementations may initially have data split across multiple buffers, so
     * calling this method may require a new buffer to be allocated and
     * populated.
     */
    IoBuffer getSingleIoBuffer();


    /**
     * A ByteArray is equal to another ByteArray if they start and end at the
     * same index, have the same byte order, and contain the same bytes at each
     * index.
     */
    public boolean equals( Object other );


    /**
     * @inheritDoc
     */
    byte get( int index );


    /**
     * @inheritDoc
     */
    public void get( int index, IoBuffer bb );


    /**
     * @inheritDoc
     */
    int getInt( int index );


    /**
     * Get a cursor starting at index 0 (which may not be the start of the array).
     */
    Cursor cursor();


    /**
     * Get a cursor starting at the given index.
     */
    Cursor cursor( int index );

    /**
     * Provides relocatable, relative access to the underlying array. Multiple
     * cursors may be used simultaneously, and cursors will stay consistent with
     * the underlying array, even across modifications.
     *
     * Should this be <code>Cloneable</code> to allow cheap mark/position
     * emulation?
     */
    public interface Cursor extends IoRelativeReader, IoRelativeWriter
    {

        /**
         * Gets the current index of the cursor.
         */
        int getIndex();


        /**
         * Sets the current index of the cursor. No bounds checking will occur
         * until an access occurs.
         */
        void setIndex( int index );


        /**
         * @inheritDoc
         */
        int getRemaining();


        /**
         * @inheritDoc
         */
        boolean hasRemaining();


        /**
         * @inheritDoc
         */
        byte get();


        /**
         * @inheritDoc
         */
        void get( IoBuffer bb );


        /**
         * @inheritDoc
         */
        int getInt();
    }

}