/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.isis.viewer.wicket.ui.components.scalars.jdkmath;
import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.Locale;
import org.apache.wicket.util.convert.ConversionException;
import org.apache.wicket.util.convert.IConverter;
import org.apache.wicket.util.convert.converter.AbstractNumberConverter;
import org.apache.wicket.util.convert.converter.BigDecimalConverter;
/**
* The {@link IConverter} implementation that our {@link BigDecimalTextField} delegates to for converting strings into
* values.
*
* <p>
* We reuse as much of Wicket's {@link BigDecimal} implementation as possible, but overriding where necessary.
* Whereas Wicket's own {@link BigDecimalConverter} is (clearly?) intended as a singleton, we actually want multiple
* instances, per scale. The {@link JavaMathBigDecimalPanelFactory} actually takes care of handling this cache,
* providing the {@link JavaMathBigDecimalPanel} with an appropriate underlying converter for it to delegate to.
*/
public class BigDecimalConverterWithScale extends BigDecimalConverter {
/**
* For {@link JavaMathBigDecimalPanelFactory} to call, so that there is a single instance.
*/
static AbstractNumberConverter<BigDecimal> newThreadSafeConverter(Integer scale) {
return new BigDecimalConverterWithScale(scale);
}
private static final long serialVersionUID = 1L;
private final Integer scale;
public BigDecimalConverterWithScale(final Integer scale) {
this.scale = scale;
}
/**
* Disables thousands separator grouping.
*/
@Override
protected NumberFormat newNumberFormat(Locale locale) {
NumberFormat numberFormat = NumberFormat.getInstance(locale);
numberFormat.setGroupingUsed(false);
return numberFormat;
}
/**
* Forces trailing zeros to be rendered.
*/
@Override
public NumberFormat getNumberFormat(final Locale locale)
{
// we obtain a clone, so is okay to modify it to our purposes.
NumberFormat numberFormat = super.getNumberFormat(locale);
if(scale != null) {
numberFormat.setMaximumFractionDigits(scale);
numberFormat.setMinimumFractionDigits(scale);
}
return numberFormat;
}
@Override
public BigDecimal convertToObject(String valueStr, Locale locale) throws ConversionException {
DecimalFormat numberFormat = (DecimalFormat) getNumberFormat(locale);
char groupingSeparator = numberFormat.getDecimalFormatSymbols().getGroupingSeparator();
if(valueStr.contains(""+groupingSeparator)) {
// TODO: this is not actually shown; we see a generic error
// need to configure the ConversionException somehow
throw new ConversionException("Thousands separator '" + groupingSeparator + "' is not allowed in input");
}
// could also throw an exception
final BigDecimal bd = super.convertToObject(valueStr, locale);
if(this.scale != null) {
if(bd.scale() > this.scale) {
// TODO: this is not actually shown; we see a generic error
// need to configure the ConversionException somehow
throw new ConversionException("No more than " + this.scale + " digits can be entered after the decimal place");
}
try {
return bd != null ? bd.setScale(this.scale) : null;
} catch(Exception ex) {
// TODO: this is not actually shown; we see a generic error
// need to configure the ConversionException somehow
throw new ConversionException("'" + valueStr + "' is not a valid decimal number.");
}
} else {
return bd;
}
}
public IConverter<BigDecimal> forEditMode() {
return this;
}
public IConverter<BigDecimal> forViewMode() {
return new BigDecimalConverterWithScale(this.scale){
private static final long serialVersionUID = 1L;
@Override
public String convertToString(BigDecimal value, Locale locale) {
NumberFormat fmt = BigDecimalConverterWithScale.this.getNumberFormat(locale);
fmt.setGroupingUsed(true);// re-enable for view mode
return fmt.format(value);
}
};
}
}