Java Locale Format formatPersent(Object input)

Description

DOC Zqin Comment method "formatPersent".

License

Open Source License

Parameter

Parameter	Description
input	the object that was formated.

Return

the persent form of this valid input object

Declaration

public static String formatPersent(Object input) 

Method Source Code

//package com.java2s;
// %InstallDIR%\features\org.talend.rcp.branding.%PRODUCTNAME%\%PRODUCTNAME%license.txt

import java.math.BigDecimal;
import java.text.DecimalFormat;

import java.util.Locale;

public class Main {
    public static final int PERCENT = 0;
    public static final int INT_NUMBER = 1;
    public static final int DOUBLE_NUMBER = 2;

    /**/* w ww. jav a  2  s  . c  om*/
     * DOC Zqin Comment method "formatPersent".
     * 
     * @param input the object that was formated.
     * @return the persent form of this valid input object
     */
    public static String formatPersent(Object input) {

        if (checkInput(input)) {
            Double db = new Double(input.toString());
            DecimalFormat format = (DecimalFormat) DecimalFormat.getPercentInstance(Locale.ENGLISH);
            format.applyPattern("0.00%"); //$NON-NLS-1$
            return format.format(db);
        }

        return null;
    }

    /**
     * DOC Zqin Comment method "checkInput".
     * 
     * @param input the object that was formated.
     * @return true if the input is valid, else false;
     */
    private static boolean checkInput(Object input) {
        if (input == null || "".equals(input)) { //$NON-NLS-1$
            return false;
        } else {
            Double db = new Double(input.toString());
            if (db.equals(Double.NaN)) {
                return false;
            }
        }

        return true;
    }

    /**
     * DOC Zqin Comment method "format".
     * 
     * @param input the object that was formated.
     * @param style the style of formated, it should be 0, 1,2,99999.
     * @return the formated object.
     */
    public static Object format(Object input, int style) {

        try {
            if (checkInput(input)) {
                DecimalFormat format = null;

                // MOD qiongli 2011-6-1 bug 21589,if input is out of the decimal precision,replace it with threshold.
                BigDecimal zero = new BigDecimal(0);
                BigDecimal temp = new BigDecimal(input.toString());
                BigDecimal min = new BigDecimal(10E-5);
                BigDecimal max = new BigDecimal(9999 * 10E-5);
                boolean isUseScientific = false;
                switch (style) {
                case PERCENT:
                    if (temp.compareTo(min) == -1 && temp.compareTo(zero) == 1) {
                        isUseScientific = true;
                    } else if (temp.compareTo(max) == 1 && temp.compareTo(new BigDecimal(1)) == -1) {
                        input = max.toString();
                    }
                    format = (DecimalFormat) DecimalFormat.getPercentInstance(Locale.ENGLISH);
                    format.applyPattern("0.00%"); //$NON-NLS-1$
                    break;
                case INT_NUMBER:
                    min = new BigDecimal(10E-3);
                    if (temp.compareTo(min) == -1 && temp.compareTo(zero) == 1) {
                        isUseScientific = true;
                    }
                    format = (DecimalFormat) DecimalFormat.getNumberInstance(Locale.ENGLISH);
                    format.applyPattern("0"); //$NON-NLS-1$
                    break;
                case DOUBLE_NUMBER:
                    min = new BigDecimal(10E-3);
                    if (temp.compareTo(min) == -1 && temp.compareTo(zero) == 1) {
                        isUseScientific = true;
                    }
                    format = (DecimalFormat) DecimalFormat.getNumberInstance(Locale.ENGLISH);
                    format.applyPattern("0.00"); //$NON-NLS-1$
                    break;
                default:
                    format = (DecimalFormat) DecimalFormat.getInstance(Locale.getDefault());
                    return format.parse(input.toString());
                }
                if (isUseScientific) {
                    format.applyPattern("0.###E0%"); //$NON-NLS-1$
                }

                return format.format(new Double(input.toString()));
            } else {
                return input;
            }
        } catch (Exception e) {
            return input;
        }
    }
}

Related

1. formatNumber(Object value, String numberFormat)
2. formatNumberSameWidth(final double v)
3. formatNumberUk(double inNumber, int inDecimalPlaces)
4. formatNumberWithThousandSeparator(long number)
5. formatPCT(Object num)
6. formatSmartDate(Date date)
7. formatString(Object[] args)
8. formatString(String pattern, Object... args)
9. formatString2Date(String dateString)