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- /*
- * Copyright 2000-2014 Vaadin Ltd.
- *
- * Licensed 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 com.vaadin.data.util.converter;
-
- import java.text.NumberFormat;
- import java.text.ParsePosition;
- import java.util.Locale;
-
- import com.vaadin.legacy.data.util.converter.LegacyConverter.ConversionException;
-
- /**
- * A converter that converts from the number type T to {@link String} and back.
- * Uses the given locale and {@link NumberFormat} for formatting and parsing.
- * Automatically trims the input string, removing any leading and trailing white
- * space.
- * <p>
- * Override and overwrite {@link #getFormat(Locale)} to use a different format.
- * </p>
- *
- * @author Vaadin Ltd
- * @since 8.0
- */
- public abstract class AbstractStringToNumberConverter<T>
- implements Converter<String, T> {
-
- /**
- * Returns the format used by {@link #convertToPresentation(Object, Locale)}
- * and {@link #convertToModel(Object, Locale)}.
- *
- * @param locale
- * The locale to use
- * @return A NumberFormat instance
- */
- protected NumberFormat getFormat(Locale locale) {
- if (locale == null) {
- locale = Locale.getDefault();
- }
-
- return NumberFormat.getNumberInstance(locale);
- }
-
- /**
- * Convert the value to a Number using the given locale and
- * {@link #getFormat(Locale)}.
- *
- * @param value
- * The value to convert
- * @param locale
- * The locale to use for conversion
- * @return The converted value
- * @throws ConversionException
- * If there was a problem converting the value
- */
- protected Number convertToNumber(String value, Locale locale)
- throws ConversionException {
- if (value == null) {
- return null;
- }
-
- // Remove leading and trailing white space
- value = value.trim();
-
- // Parse and detect errors. If the full string was not used, it is
- // an error.
- ParsePosition parsePosition = new ParsePosition(0);
- Number parsedValue = getFormat(locale).parse(value, parsePosition);
- if (parsePosition.getIndex() != value.length()) {
- throw new ConversionException("Could not convert '" + value + "'");
- }
-
- if (parsedValue == null) {
- // Convert "" to null
- return null;
- }
-
- return parsedValue;
- }
-
- @Override
- public String convertToPresentation(T value, Locale locale) {
- if (value == null) {
- return null;
- }
-
- return getFormat(locale).format(value);
- }
-
- }
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