/**
 * Copyright 2007-2016, Kaazing Corporation. All rights reserved.
 *
 * 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.mina.util.byteaccess;


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


/**
 * Provides restricted, relative, read-only access to the bytes in a
 * <code>CompositeByteArray</code>. Using this interface has the advantage
 * that it can be automatically determined when a component
 * <code>ByteArray</code> can no longer be read, and thus components can be
 * automatically freed. This makes it easier to use pooling for underlying
 * <code>ByteArray</code>s.
 * 
 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
 */
public class CompositeByteArrayRelativeReader extends CompositeByteArrayRelativeBase implements IoRelativeReader
{

    /**
     * Whether or not to free component <code>CompositeByteArray</code>s when
     * the cursor moves past them.
     */
    private final boolean autoFree;

    /**
     * 
     * Creates a new instance of CompositeByteArrayRelativeReader.
     *
     * @param cba
     *  The backing ByteArray
     * @param autoFree
     *  If data should be freed once it has been passed in the list
     */
    public CompositeByteArrayRelativeReader( CompositeByteArray cba, boolean autoFree )
    {
        super( cba );
        this.autoFree = autoFree;
    }


    @Override
    protected void cursorPassedFirstComponent()
    {
        if ( autoFree )
        {
            cba.removeFirst().free();
        }
    }


    /**
     * @inheritDoc
     */
    public void skip( int length )
    {
        cursor.skip( length );
    }


    /**
     * @inheritDoc
     */
    public ByteArray slice( int length )
    {
        return cursor.slice( length );
    }

    /**
     * Returns the byte at the current position in the buffer
     * 
     */
    public byte get()
    {
        return cursor.get();
    }

    /**
     * places the data starting at current position into the
     * supplied {@link IoBuffer}
     */
    public void get( IoBuffer bb )
    {
        cursor.get( bb );
    }


    /**
     * @inheritDoc
     */
    public short getShort()
    {
        return cursor.getShort();
    }


    /**
     * @inheritDoc
     */
    public int getInt()
    {
        return cursor.getInt();
    }


    /**
     * @inheritDoc
     */
    public long getLong()
    {
        return cursor.getLong();
    }


    /**
     * @inheritDoc
     */
    public float getFloat()
    {
        return cursor.getFloat();
    }


    /**
     * @inheritDoc
     */
    public double getDouble()
    {
        return cursor.getDouble();
    }


    /**
     * @inheritDoc
     */
    public char getChar()
    {
        return cursor.getChar();
    }

}
