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Left.javaAPI DocApache Poi 3.0.13781Sun Mar 11 12:59:30 GMT 2007org.apache.poi.hssf.record.formula.functions

Left

public class Left extends TextFunction
author
Amol S. Deshmukh < amolweb at ya hoo dot com >

Fields Summary
Constructors Summary
Methods Summary
public org.apache.poi.hssf.record.formula.eval.Evalevaluate(org.apache.poi.hssf.record.formula.eval.Eval[] operands, int srcCellRow, short srcCellCol)

        Eval retval = ErrorEval.VALUE_INVALID;
        int index = 1;
        switch (operands.length) {
        default:
            break;
        case 2:
            Eval indexEval = operands[1];
            index = evaluateAsInteger(indexEval);
            if (index < 0) {
                break;
            }
        case 1:
            ValueEval veval = singleOperandEvaluate(operands[0], srcCellRow, srcCellCol);
            String str = null;
            if (veval instanceof StringEval) {
                StringEval stringEval = (StringEval) veval;
                str = stringEval.getStringValue();
            }
            else if (veval instanceof BoolEval) {
                BoolEval beval = (BoolEval) veval;
                str = beval.getBooleanValue() ? "TRUE" : "FALSE";
            }
            else if (veval instanceof NumberEval) {
                NumberEval neval = (NumberEval) veval;
                str = neval.getStringValue();
            }
            if (null != str) {
                str = str.substring(0, Math.min(str.length(), index));
                retval = new StringEval(str);
            }
        }
        return retval;
protected intevaluateAsInteger(org.apache.poi.hssf.record.formula.eval.Eval eval)

        int numval = -1;
        if (eval instanceof NumberEval) {
            NumberEval neval = (NumberEval) eval;
            double d = neval.getNumberValue();
            numval = (int) d;
        }
        else if (eval instanceof StringEval) {
            StringEval seval = (StringEval) eval;
            String s = seval.getStringValue();
            try { 
                double d = Double.parseDouble(s);
                numval = (int) d;
            } 
            catch (Exception e) {
            }
        }
        else if (eval instanceof BoolEval) {
            BoolEval beval = (BoolEval) eval;
            numval = beval.getBooleanValue() ? 1 : 0;
        }
        else if (eval instanceof RefEval) {
            numval = evaluateAsInteger(xlateRefEval((RefEval) eval));
        }
        return numval;
protected org.apache.poi.hssf.record.formula.eval.EvalxlateRefEval(org.apache.poi.hssf.record.formula.eval.RefEval reval)

        Eval retval = reval.getInnerValueEval();
        
        if (retval instanceof RefEval) {
            retval = xlateRefEval((RefEval) retval);
        }
        return retval;