Shift.java

/*
 * Copyright 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/4305
 * PRONOM 4
 *
 * $History: Shift.java $
 * 
 * *****************  Version 6  *****************
 * User: Walm         Date: 17/05/05   Time: 12:48
 * Updated in $/PRONOM4/FFIT_SOURCE/signatureFile
 * wait for end of element tag before setting its content via the
 * completeElementContent method
 * 
 * *****************  Version 5  *****************
 * User: Walm         Date: 5/04/05    Time: 18:07
 * Updated in $/PRONOM4/FFIT_SOURCE/signatureFile
 * review headers
 *
 */
package uk.gov.nationalarchives.droid.signatureFile;

import uk.gov.nationalarchives.droid.MessageDisplay;
import uk.gov.nationalarchives.droid.xmlReader.SimpleElement;

/**
 * holds a shift function value
 *
 * @author Martin Waller
 * @version 4.0.0
 */
public class Shift extends SimpleElement {
    long myShiftValue;
    int myShiftByte = 999;

    /**
     * Set the shift distance when the end of element tag is reached.
     * This will have been stored in the text attribute by the setText method defined in SimpleElement
     */
    public void completeElementContent() {
        String theElementValue = this.getText();   //((SimpleElement)this).getText();
        try {
            this.myShiftValue = Long.parseLong(theElementValue);
        } catch (Exception e) {
            MessageDisplay.generalWarning("The following non-numerical shift distance was found in the signature file: " + theElementValue);
            this.myShiftValue = 1;
        }

    }

    /**
     * Respond to an XML attribute
     *
     * @param theName  attribute name
     * @param theValue attribute value
     */
    public void setAttributeValue(String theName, String theValue) {
        if (theName.equals("Byte")) {
            try {
                myShiftByte = Integer.parseInt(theValue, 16);
            } catch (Exception e) {
            }
        } else {
            MessageDisplay.unknownAttributeWarning(theName, this.getElementName());
        }
    }

    /* getters */
    public int getShiftByte() {
        return myShiftByte;
    }

    public long getShiftValue() {
        return myShiftValue;
    }
}