com.autentia.wuija.util.web.jsf.NumberAsBigDecimalConverter.java Source code

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Here is the source code for com.autentia.wuija.util.web.jsf.NumberAsBigDecimalConverter.java

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/**
 * Copyright 2008 Autentia Real Business Solutions S.L. This file is part of Autentia WUIJA. Autentia WUIJA is free software:
 * you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation, version 3 of the License. Autentia WUIJA is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public
 * License along with Autentia WUIJA. If not, see <http://www.gnu.org/licenses/>.
 */

package com.autentia.wuija.util.web.jsf;

import java.math.BigDecimal;

import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.ConverterException;
import javax.faces.convert.NumberConverter;

import org.apache.commons.lang.StringUtils;

import com.autentia.common.util.web.jsf.JsfUtils;

/**
 * Converts a Double or Long value provided by standard jsf number converter to a BigDecimal value To get a locale-sensitive
 * converter, java.text.NumberFormat is used (through javax.faces.convert.NumberConverter). The parsing done by
 * java.math.BigDecimal is not affected by locale. See javax.faces.convert.BigDecimalConverter
 */

public class NumberAsBigDecimalConverter extends NumberConverter {

    private static final int DECIMAL_POSITIONS = 3;

    private String getPattern(UIComponent component) {

        String patternToAply = (String) component.getAttributes().get("pattern");

        if (patternToAply == null) {
            patternToAply = "#,##0.00";
        }

        return patternToAply;
    }

    @Override
    public Object getAsObject(FacesContext facesContext, UIComponent uiComponent, String value)
            throws ConverterException {
        super.setPattern(getPattern(uiComponent));

        Object object = super.getAsObject(facesContext, uiComponent, value);
        if (object == null) {
            return object;
        }

        if (value == null) {
            return null;
        }

        if (!StringUtils.containsOnly(value, "0123456789.,-+")) {
            throw new ConverterException(value);
        }

        if (!checkIfIsCorrectDecimal(value)) {
            JsfUtils.addMessage(uiComponent.getClientId(facesContext), FacesMessage.SEVERITY_ERROR,
                    "javax.faces.converter.BigDecimalConverter.DECIMAL", value);
            throw new ConverterException(value);
        }

        if (value.contains(",")) {
            final String decimalValue = value.substring(value.indexOf(',') + 1);
            String integerValue;
            try {
                integerValue = value.substring(0, value.indexOf(','));
                integerValue = integerValue.replace(".", "");
                return new BigDecimal(integerValue.concat(".").concat(decimalValue));
            } catch (NumberFormatException e) {
                throw new ConverterException(value);
            }
        }
        return new BigDecimal(value.replace(".", ""));
    }

    @Override
    public String getAsString(FacesContext context, UIComponent component, Object value) throws ConverterException {

        super.setPattern(getPattern(component));

        return super.getAsString(context, component, value);
    }

    private static boolean checkIfIsCorrectDecimal(String param) {
        int idx = param.lastIndexOf('.');
        int len = param.length();

        if ((idx != -1) && (idx >= len - DECIMAL_POSITIONS)) {
            return false;
        }

        return true;
    }

}