| /* |
| * Copyright 2011 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.i18n.server; |
| |
| import com.google.gwt.i18n.client.Localizable; |
| import com.google.gwt.i18n.client.LocalizableResource.DefaultLocale; |
| import com.google.gwt.i18n.client.Messages.PluralCount; |
| import com.google.gwt.i18n.client.Messages.Select; |
| import com.google.gwt.i18n.client.PluralRule; |
| import com.google.gwt.i18n.client.impl.plurals.DefaultRule; |
| import com.google.gwt.i18n.shared.AlternateMessageSelector; |
| import com.google.gwt.i18n.shared.GwtLocale; |
| import com.google.gwt.i18n.shared.GwtLocaleFactory; |
| |
| import java.lang.annotation.Annotation; |
| |
| /** |
| * Base class for implementations of {@link Parameter}. |
| */ |
| public abstract class AbstractParameter implements Parameter { |
| |
| /** |
| * Instantiate a plural rule class. |
| * |
| * @param pluralClass base plural rule class |
| * @param locale |
| * @return {@link PluralRule} instance for the specified locale |
| */ |
| public static PluralRule getLocalizedPluralRule( |
| Class<? extends PluralRule> pluralClass, GwtLocale locale) { |
| // TODO(jat): is this the right place for this method? |
| |
| // Handle annotation default value |
| if (PluralRule.class == pluralClass) { |
| pluralClass = DefaultRule.class; |
| } |
| if (!Localizable.class.isAssignableFrom(pluralClass)) { |
| try { |
| return pluralClass.newInstance(); |
| } catch (InstantiationException e) { |
| // TODO: log |
| return null; |
| } catch (IllegalAccessException e) { |
| // TODO: log |
| return null; |
| } |
| } |
| String fqcn = pluralClass.getCanonicalName(); |
| for (GwtLocale search : locale.getCompleteSearchList()) { |
| String cn = fqcn; |
| if (!search.isDefault()) { |
| cn += "_" + search.getAsString(); |
| } |
| try { |
| Class<?> clazz = Class.forName(cn); |
| pluralClass = clazz.asSubclass(PluralRule.class); |
| return pluralClass.newInstance(); |
| } catch (ClassCastException e) { |
| // TODO(jat): log, but keep looking |
| } catch (ClassNotFoundException e) { |
| // expected, continue looking |
| } catch (InstantiationException e) { |
| // TODO(jat): log, but keep looking |
| } catch (IllegalAccessException e) { |
| // TODO(jat): log, but keep looking |
| } |
| } |
| return null; |
| } |
| |
| protected final GwtLocaleFactory localeFactory; |
| |
| protected final int index; |
| |
| protected final Type type; |
| |
| private AlternateMessageSelector altMsgSelector; |
| |
| public AbstractParameter(GwtLocaleFactory localeFactory, int index, |
| Type type) { |
| this.localeFactory = localeFactory; |
| this.index = index; |
| this.type = type; |
| } |
| |
| public synchronized AlternateMessageSelector getAlternateMessageSelector() { |
| if (altMsgSelector == null) { |
| altMsgSelector = computeAlternateMessageSelector(); |
| } |
| return altMsgSelector; |
| } |
| |
| public abstract <A extends Annotation> A getAnnotation(Class<A> annotClass); |
| |
| public int getIndex() { |
| return index; |
| } |
| |
| public abstract String getName(); |
| |
| public Type getType() { |
| return type; |
| } |
| |
| public boolean isAnnotationPresent(Class<? extends Annotation> annotClass) { |
| return getAnnotation(annotClass) != null; |
| } |
| |
| private AlternateMessageSelector computeAlternateMessageSelector() { |
| PluralCount pluralAnnot = getAnnotation(PluralCount.class); |
| if (pluralAnnot != null) { |
| Class<? extends PluralRule> pluralClass = pluralAnnot.value(); |
| // TODO(jat): this seems redundant with other processing |
| DefaultLocale defLocaleAnnot = getAnnotation( |
| DefaultLocale.class); |
| String defaultLocale = null; |
| if (defLocaleAnnot != null) { |
| defaultLocale = defLocaleAnnot.value(); |
| } else { |
| defaultLocale = DefaultLocale.DEFAULT_LOCALE; |
| } |
| PluralRule pluralRule = getLocalizedPluralRule(pluralClass, |
| localeFactory.fromString(defaultLocale)); |
| return new PluralRuleAdapter(pluralRule); |
| } |
| Select selectAnnot = getAnnotation(Select.class); |
| if (selectAnnot != null) { |
| final String[] validValues = type.getEnumValues(); |
| return new AlternateMessageSelector() { |
| public boolean isFormAcceptable(String form) { |
| if (validValues == null || AlternateMessageSelector.OTHER_FORM_NAME.equals(form)) { |
| return true; |
| } |
| for (String value : validValues) { |
| if (value.equals(form)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| }; |
| } |
| return null; |
| } |
| } |