com.squarespace.template.plugins.platform.i18n.MoneyFormatter.java Source code

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Here is the source code for com.squarespace.template.plugins.platform.i18n.MoneyFormatter.java

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/**
 * Copyright (c) 2015 SQUARESPACE, 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.squarespace.template.plugins.platform.i18n;

import java.util.Currency;
import java.util.Locale;

import org.apache.commons.lang3.LocaleUtils;
import org.apache.commons.lang3.StringUtils;

import com.fasterxml.jackson.databind.JsonNode;
import com.squarespace.template.Arguments;
import com.squarespace.template.ArgumentsException;
import com.squarespace.template.BaseFormatter;
import com.squarespace.template.CodeExecuteException;
import com.squarespace.template.Context;

class MoneyFormatter extends BaseFormatter {

    private static final String FORMATTER_NAME = "i18n-money-format";

    private static final Currency DEFAULT_CURRENCY = Currency.getInstance("USD");

    private static final Locale DEFAULT_LOCALE = Locale.US;

    private static final String CURRENCY_FIELD_NAME = "currencyCode";

    private static final String VALUE_FIELD_NAME = "decimalValue";

    MoneyFormatter() {
        super(FORMATTER_NAME, false);
    }

    @Override
    public void validateArgs(Arguments args) throws ArgumentsException {
        args.atMost(1);

        String localeStr = getLocaleArg(args);
        if (localeStr != null) {
            Locale locale;
            try {
                // LocaleUtils uses an underscore format (e.g. en_US), but the new Java standard
                // is a hyphenated format (e.g. en-US). This allows us to use LocaleUtils' validation.
                locale = LocaleUtils.toLocale(localeStr.replace('-', '_'));
            } catch (IllegalArgumentException e) {
                throw new ArgumentsException("Invalid locale: " + localeStr);
            }

            args.setOpaque(locale);
        } else {
            args.setOpaque(DEFAULT_LOCALE);
        }
    }

    @Override
    public JsonNode apply(Context ctx, Arguments args, JsonNode node) throws CodeExecuteException {
        Locale locale = (Locale) args.getOpaque();
        Currency currency = getCurrency(node);
        double value = node.path(VALUE_FIELD_NAME).asDouble(0);
        return ctx.buildNode(MoneyFormatFactory.create(locale, currency).format(value));
    }

    private static String getLocaleArg(Arguments args) {
        if (args.count() == 0) {
            return null;
        }

        return StringUtils.trimToNull(args.first());
    }

    private static Currency getCurrency(JsonNode node) {
        String currencyStr = StringUtils.trimToNull(node.path(CURRENCY_FIELD_NAME).asText());
        if (currencyStr == null) {
            return DEFAULT_CURRENCY;
        }

        return Currency.getInstance(currencyStr);
    }
}