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LVG tools is used by Apache cTAKES.

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package gov.nih.nlm.nls.lvg.Flows;
import java.util.*;
import gov.nih.nlm.nls.lvg.Lib.*;
/*****************************************************************************
* This class lowercases the input term.
*
* History:
* 

* 
*
* @author NLM NLS Development Team
*
* @see 
* Design Document 
*
* @version    V-2010
****************************************************************************/
public class ToLowerCase extends Transformation implements Cloneable
{
    // public methods
    /**
    * Performs the mutation of this flow component.
    *
    * @param   in   a LexItem as the input for this flow component
    * @param   detailsFlag   a boolean flag for processing details information
    * @param   mutateFlag   a boolean flag for processing mutate information
    *
    * @return  Vector  the results from this flow component
    */
    public static Vector Mutate(LexItem in, boolean detailsFlag, 
        boolean mutateFlag)
    {
        // mutate the term
        String term = in.GetSourceTerm().toLowerCase();
        // details & mutate
        String details = null;
        String mutate = null;
        if(detailsFlag == true)
        {
            details = INFO;
        }
        if(mutateFlag == true)
        {
            mutate = Transformation.NO_MUTATE_INFO;
        }
        // update target LexItem
        Vector out = new Vector();
        LexItem temp = UpdateLexItem(in, term, Flow.LOWER_CASE, 
            Transformation.UPDATE, Transformation.UPDATE, details, mutate);
        out.addElement(temp);
        return out;
    }
    /**
    * A unit test driver for this flow component.
    */
    public static void main(String[] args)
    {
        String testStr = GetTestStr(args, "AIDS");        // get input String
        // Mutate
        LexItem in = new LexItem(testStr);
        Vector outs = ToLowerCase.Mutate(in, true, true);
        PrintResults(in, outs);     // print out results
    }
    // private method
    // data members
    private static final String INFO = "Lowercase Words";
}