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/*
 * The National Archives 2005-2006. All rights reserved. See Licence.txt for
 * full licence details. Developed by: Tessella Support Services plc 3
 * Vineyard Chambers Abingdon, OX14 3PX United Kingdom http://www.tessella.com
 * Tessella/NPD/4826 PRONOM 5a $Id: ByteReader.java,v 1.6 2006/03/13 15:15:28
 * linb Exp $ $Log: ByteReader.java,v $ Revision 1.6 2006/03/13 15:15:28 linb
 * Changed copyright holder from Crown Copyright to The National Archives.
 * Added reference to licence.txt Changed dates to 2005-2006 Revision 1.5
 * 2006/02/09 13:17:41 linb Changed StreamByteReader to InputStreamByteReader
 * Refactored common code from UrlByteReader and InputStreamByteReader into
 * new class StreamByteReader, from which they both inherit Updated javadoc
 * Revision 1.4 2006/02/09 12:14:16 linb Changed some javadoc to allow it to
 * be created cleanly Revision 1.3 2006/02/08 12:51:53 linb Added javadoc
 * comments for file. Revision 1.2 2006/02/08 08:56:35 linb - Added header
 * comments
 */
package uk.gov.nationalarchives.droid.binFileReader;

import uk.gov.nationalarchives.droid.base.FileFormatHit;

/**
 * Interface for accessing the bytes from a file, URL or stream.
 * 
 * Create an instance with AbstractByteReader.newByteReader().
 * 
 * @author linb
 */
public interface ByteReader {

	/**
	 * Add another hit to the list of hits for this file.
	 * 
	 * @param theHit
	 *            The FileFormatHit to be added
	 */
	public void addHit(FileFormatHit theHit);



	/**
	 * Get a byte from file
	 * 
	 * @param fileIndex
	 *            position of required byte in the file
	 * @return the byte at position fileIndex in the file
	 */
	public byte getByte(long fileIndex);

	/**
	 * Get classification of the file
	 */
	public int getClassification();

	/**
	 * Gets the current position of the file marker.
	 * 
	 * @return the current position of the file marker
	 */
	public long getFileMarker();

	/**
	 * Get file name of the associated file
	 */
	public String getFileName();

	/**
	 * Get file path of the associated file
	 */
	public String getFilePath();

	/**
	 * Get a file format hit
	 * 
	 * @param theIndex
	 *            index of the FileFormatHit to get
	 * @return the hit associated with theIndex
	 */
	public FileFormatHit getHit(int theIndex);

	/**
	 * Get any warning message created when identifying this file
	 */
	public String getIdentificationWarning();

	/**
	 * Returns the number of bytes in the file
	 */
	public long getNumBytes();

	/**
	 * Get number of file format hits
	 */
	public int getNumHits();

	/**
	 * Checks whether the file has yet been classified
	 */
	public boolean isClassified();

	/**
	 * Remove a hit from the list of hits for this file.
	 * 
	 * @param theIndex
	 *            Index of the hit to be removed
	 */
	public void removeHit(int theIndex);

	/**
	 * Set identification status to Error
	 */
	public void setErrorIdent();

	/**
	 * Position the file marker at a given byte position.
	 * 
	 * The file marker is used to record how far through the file the byte
	 * sequence matching algorithm has got.
	 * 
	 * @param markerPosition
	 *            The byte number in the file at which to position the marker
	 */
	public void setFileMarker(long markerPosition);

	/**
	 * Set identification warning
	 * 
	 * @param theWarning
	 *            the warning message to use
	 */
	public void setIdentificationWarning(String theWarning);

	/**
	 * Set identification status to No identification
	 */
	public void setNoIdent();

	/* Setters for identification status */
	/**
	 * Set identification status to Positive
	 */
	public void setPositiveIdent();

}