com.gargoylesoftware.htmlunit.javascript.host.DateCustom.java Source code

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Here is the source code for com.gargoylesoftware.htmlunit.javascript.host.DateCustom.java

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/*
 * Copyright (c) 2002-2016 Gargoyle Software 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.gargoylesoftware.htmlunit.javascript.host;

import static com.gargoylesoftware.htmlunit.BrowserVersionFeatures.JS_DATE_LOCALE_DATE_SHORT;
import static com.gargoylesoftware.htmlunit.BrowserVersionFeatures.JS_DATE_LOCALE_DATE_SHORT_WITH_SPECIAL_CHARS;
import static com.gargoylesoftware.htmlunit.BrowserVersionFeatures.JS_DATE_LOCALE_TIME_WITH_SPECIAL_CHARS;

import java.lang.reflect.Field;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;

import org.apache.commons.lang3.time.DateFormatUtils;
import org.apache.commons.lang3.time.FastDateFormat;

import com.gargoylesoftware.htmlunit.BrowserVersion;

import net.sourceforge.htmlunit.corejs.javascript.Context;
import net.sourceforge.htmlunit.corejs.javascript.Function;
import net.sourceforge.htmlunit.corejs.javascript.Scriptable;

/**
 * Contains some missing features of Rhino NativeDate.
 *
 * @author Ahmed Ashour
 * @author Ronald Brill
 * @author Frank Danek
 */
public final class DateCustom {

    private static final TimeZone UTC_TIME_ZONE = TimeZone.getTimeZone("UTC");

    private DateCustom() {
    }

    private static Field DATE_FIELD_;

    /**
     * Converts a date to a string, returning the "date" portion using the operating system's locale's conventions.
     * @param context the JavaScript context
     * @param thisObj the scriptable
     * @param args the arguments passed into the method
     * @param function the function
     * @return converted string
     */
    public static String toLocaleDateString(final Context context, final Scriptable thisObj, final Object[] args,
            final Function function) {
        final String formatString;
        final BrowserVersion browserVersion = ((Window) thisObj.getParentScope()).getBrowserVersion();

        if (browserVersion.hasFeature(JS_DATE_LOCALE_DATE_SHORT_WITH_SPECIAL_CHARS)) {
            // [U+200E] -> Unicode Character 'LEFT-TO-RIGHT MARK'
            formatString = "\u200Edd\u200E.\u200EMM\u200E.\u200Eyyyy";
        } else if (browserVersion.hasFeature(JS_DATE_LOCALE_DATE_SHORT)) {
            formatString = "d.M.yyyy";
        } else {
            formatString = "EEEE, MMMM dd, yyyy";
        }
        final FastDateFormat format = FastDateFormat.getInstance(formatString, getLocale(thisObj));
        return format.format(getDateValue(thisObj));
    }

    /**
     * Converts a date to a string, returning the "time" portion using the current locale's conventions.
     * @param context the JavaScript context
     * @param thisObj the scriptable
     * @param args the arguments passed into the method
     * @param function the function
     * @return converted string
     */
    public static String toLocaleTimeString(final Context context, final Scriptable thisObj, final Object[] args,
            final Function function) {
        final String formatString;
        final BrowserVersion browserVersion = ((Window) thisObj.getParentScope()).getWebWindow().getWebClient()
                .getBrowserVersion();

        if (browserVersion.hasFeature(JS_DATE_LOCALE_TIME_WITH_SPECIAL_CHARS)) {
            // [U+200E] -> Unicode Character 'LEFT-TO-RIGHT MARK'
            formatString = "\u200EHH\u200E:\u200Emm\u200E:\u200Ess";
        } else {
            formatString = "HH:mm:ss";
        }
        final FastDateFormat format = FastDateFormat.getInstance(formatString, getLocale(thisObj));
        return format.format(getDateValue(thisObj));
    }

    /**
     * Converts a date to a UTC string. Special version for IE
     * @param context the JavaScript context
     * @param thisObj the scriptable
     * @param args the arguments passed into the method
     * @param function the function
     * @return converted string
     */
    public static String toUTCString(final Context context, final Scriptable thisObj, final Object[] args,
            final Function function) {
        final Date date = new Date(getDateValue(thisObj));
        return DateFormatUtils.format(date, "EEE, d MMM yyyy HH:mm:ss z", UTC_TIME_ZONE, Locale.ENGLISH);
    }

    private static long getDateValue(final Scriptable thisObj) {
        try {
            if (DATE_FIELD_ == null) {
                DATE_FIELD_ = thisObj.getClass().getDeclaredField("date");
                DATE_FIELD_.setAccessible(true);
            }
            return ((Double) DATE_FIELD_.get(thisObj)).longValue();
        } catch (final Exception e) {
            throw Context.throwAsScriptRuntimeEx(e);
        }
    }

    private static Locale getLocale(final Scriptable thisObj) {
        final BrowserVersion broserVersion = ((Window) thisObj.getParentScope()).getBrowserVersion();
        return new Locale(broserVersion.getSystemLanguage());
    }
}