com.google.gwt.sample.i18n.client.NumberFormatExampleController.java Source code

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Here is the source code for com.google.gwt.sample.i18n.client.NumberFormatExampleController.java

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/*
 * Copyright 2007 Google Inc.
 * 
 * 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.google.gwt.sample.i18n.client;

import com.google.gwt.i18n.client.NumberFormat;
import com.google.gwt.user.client.ui.HasText;

/**
 * Demonstrates how to use {@link NumberFormat}.
 */
public class NumberFormatExampleController extends AbstractFormatExampleController {

    private static final String DEFAULT_INPUT = "31415926535.897932";
    private NumberFormat activeFormat;
    private final NumberFormatExampleConstants constants;

    public NumberFormatExampleController(final NumberFormatExampleConstants constants) {
        super(DEFAULT_INPUT, constants.numberFormatPatterns());
        this.constants = constants;
    }

    public NumberFormatExampleConstants getConstants() {
        return constants;
    }

    @Override
    protected String doGetPattern(String patternKey) {
        if ("currency".equals(patternKey)) {
            return NumberFormat.getCurrencyFormat().getPattern();
        }

        if ("decimal".equals(patternKey)) {
            return NumberFormat.getDecimalFormat().getPattern();
        }

        if ("scientific".equals(patternKey)) {
            return NumberFormat.getScientificFormat().getPattern();
        }

        if ("percent".equals(patternKey)) {
            return NumberFormat.getPercentFormat().getPattern();
        }

        throw new IllegalArgumentException("Unknown pattern key '" + patternKey + "'");
    }

    @Override
    protected void doParseAndRememberPattern(String pattern) {
        activeFormat = NumberFormat.getFormat(pattern);
    }

    @Override
    protected void doParseInput(String toParse, HasText output, HasText error) {
        if (!"".equals(toParse)) {
            try {
                double x = Double.parseDouble(toParse);
                String s = activeFormat.format(x);
                output.setText(s);
            } catch (NumberFormatException e) {
                String errMsg = constants.failedToParseInput();
                error.setText(errMsg);
            }
        } else {
            output.setText("<None>");
        }
    }
}