provide user session's locale

#581

src/main/java/de/metas/ui/web/session/UserSession.java

@@ -278,6 +278,12 @@ public Locale getLocale()
 	{
 		return data.getLocale();
 	}
+
+	public UserSessionLocale getUserSessionLocale()
+	{
+		return UserSessionLocale.get(getAD_Language());
+	}
+
 
 	public boolean isUseHttpAcceptLanguage()
 	{
@@ -409,7 +415,7 @@ public int getHttpCacheMaxAge()
 	{
 		return data.getHttpCacheMaxAge();
 	}
-
+	
 	/**
 	 * Event fired when the user language was changed.
 	 * Usually it is user triggered.

src/main/java/de/metas/ui/web/session/UserSessionLocale.java

@@ -0,0 +1,63 @@
+package de.metas.ui.web.session;
+
+import java.text.DecimalFormat;
+import java.text.DecimalFormatSymbols;
+
+import org.compiere.util.CCache;
+import org.compiere.util.DisplayType;
+
+import de.metas.i18n.Language;
+import lombok.NonNull;
+import lombok.Value;
+
+/*
+ * #%L
+ * metasfresh-webui-api
+ * %%
+ * Copyright (C) 2017 metas GmbH
+ * %%
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program. If not, see
+ * <http://www.gnu.org/licenses/gpl-2.0.html>.
+ * #L%
+ */
+
+@Value
+public class UserSessionLocale
+{
+	public static final UserSessionLocale get(@NonNull final String adLanguage)
+	{
+		return cache.getOrLoad(adLanguage, () -> new UserSessionLocale(adLanguage));
+	}
+
+	private static final CCache<String, UserSessionLocale> cache = CCache.newCache(UserSessionLocale.class.getName(), 10, 0);
+
+	private final String adLanguage;
+	private final char numberDecimalSeparator;
+	private final char numberGroupingSeparator;
+
+	private UserSessionLocale(final String adLanguage)
+	{
+		final Language language = Language.getLanguage(adLanguage);
+		if (language == null)
+		{
+			throw new IllegalArgumentException("No language found for " + adLanguage);
+		}
+		this.adLanguage = language.getAD_Language();
+
+		final DecimalFormat decimalFormat = DisplayType.getNumberFormat(DisplayType.Amount, language);
+		final DecimalFormatSymbols decimalFormatSymbols = decimalFormat.getDecimalFormatSymbols();
+		numberDecimalSeparator = decimalFormatSymbols.getDecimalSeparator();
+		numberGroupingSeparator = decimalFormatSymbols.getGroupingSeparator();
+	}
+}

src/main/java/de/metas/ui/web/session/json/JSONUserSession.java

@@ -69,6 +69,8 @@ public static final JSONUserSession of(final UserSession userSession)
 
 	@JsonProperty("language")
 	private final JSONLookupValue language;
+	@JsonProperty("locale")
+	private final JSONUserSessionLocale locale;
 
 	@JsonProperty("timeZone")
 	private final String timeZone;
@@ -116,6 +118,7 @@ private JSONUserSession(final UserSession userSession)
 
 		final Language language = userSession.getLanguage();
 		this.language = JSONLookupValue.of(language.getAD_Language(), language.getName());
+		this.locale = JSONUserSessionLocale.of(userSession.getUserSessionLocale());
 
 		timeZone = JSONDate.getCurrentTimeZoneAsJson();
 	}

src/main/java/de/metas/ui/web/session/json/JSONUserSessionLocale.java

@@ -0,0 +1,48 @@
+package de.metas.ui.web.session.json;
+
+import com.fasterxml.jackson.annotation.JsonAutoDetect;
+import com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility;
+
+import de.metas.ui.web.session.UserSessionLocale;
+import lombok.Value;
+
+/*
+ * #%L
+ * metasfresh-webui-api
+ * %%
+ * Copyright (C) 2017 metas GmbH
+ * %%
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program. If not, see
+ * <http://www.gnu.org/licenses/gpl-2.0.html>.
+ * #L%
+ */
+
+@JsonAutoDetect(fieldVisibility = Visibility.ANY, getterVisibility = Visibility.NONE, isGetterVisibility = Visibility.NONE, setterVisibility = Visibility.NONE)
+@Value
+public class JSONUserSessionLocale
+{
+	public static JSONUserSessionLocale of(final UserSessionLocale locale)
+	{
+		return new JSONUserSessionLocale(locale);
+	}
+
+	private final char numberDecimalSeparator;
+	private final char numberGroupingSeparator;
+
+	private JSONUserSessionLocale(final UserSessionLocale locale)
+	{
+		numberDecimalSeparator = locale.getNumberDecimalSeparator();
+		numberGroupingSeparator = locale.getNumberGroupingSeparator();
+	}
+}