content: package act.data;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2017 ActFramework
   * %%
   * 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.
   * #L%
   */
  
  import act.conf.AppConfig;
  import act.util.ActContext;
  import org.osgl.$;
  import org.osgl.logging.L;
  import org.osgl.logging.Logger;
  import org.osgl.mvc.result.BadRequest;
  import org.osgl.util.S;
  import org.osgl.util.StringValueResolver;
  
  import java.text.DateFormat;
  import java.text.ParseException;
  import java.text.SimpleDateFormat;
  import java.util.Date;
  import java.util.Locale;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.ConcurrentMap;
  
  public abstract class DateResolverBase<T extends Date> extends StringValueResolver<T> {
      static Logger logger = L.get(DateResolverBase.class);
  
      private ConcurrentMap<Locale, DateFormat> localizedDateFormats = new ConcurrentHashMap<>();
  
      protected DateFormat dateFormat;
      protected DateFormat dateFormat2;
      private boolean i18n;
      private Locale defLocale;
      protected AppConfig config;
  
      public DateResolverBase(AppConfig config) {
          this.i18n = config.i18nEnabled();
          this.config = config;
          this.defLocale = config.locale();
          String pattern = configuredPattern(config);
          if (null == pattern || pattern.contains("8601") || pattern.contains("iso")) {
              this.dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
              this.dateFormat2 = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSXXX");
          } else {
              this.dateFormat = new SimpleDateFormat(pattern);
          }
      }
  
      public DateResolverBase(String pattern) {
          this.dateFormat = new SimpleDateFormat(pattern);
      }
  
      @Override
      public final T resolve(String value) {
          if (S.blank(value)) {
              return null;
          }
          if ("now".equalsIgnoreCase(value)
                  || "today".equalsIgnoreCase(value)
                  || "现在".equalsIgnoreCase(value)
                  || "今天".equalsIgnoreCase(value)
          ) {
              return cast(new Date());
          }
          // for #691
          Date date = parse(value);
          if (null == date && S.isIntOrLong(value)) {
              long epoc = Long.parseLong(value);
              date = $.convert(epoc).to(Date.class);
              return cast(date);
          }
          if (null == date) {
              throw new BadRequest("Invalid date time format: " + value);
          }
          return cast(date);
      }
  
      protected String configuredPattern(AppConfig config) {
          return config.dateTimePattern();
      }
  
      protected abstract T cast(Date date);
  
      private Date parse(String value) {
          DateFormat dateFormat = dateFormat();
          try {
              return dateFormat.parse(value);
          } catch (ParseException e) {
              if (null == dateFormat2) {
                  logger.error("error parsing date value from: %s", value);
                  return null;
              }
              try {
                  return dateFormat2.parse(value);
              } catch (ParseException e2) {
                  logger.error("error parsing date value from: %s", value);
                  return null;
              }
          }
      }
  
      private DateFormat dateFormat() {
          ActContext ctx = ActContext.Base.currentContext();
          String pattern = null == ctx ? null : ctx.dateFormatPattern();
          if (S.notBlank(pattern)) {
              return new SimpleDateFormat(pattern);
          }
          if (!i18n) {
              return dateFormat;
          }
          if (null == ctx) {
              return dateFormat;
          }
          Locale locale = ctx.locale();
          if (null == locale) {
              return dateFormat;
          }
          if (locale.equals(defLocale)) {
              return dateFormat;
          }
          return dateFormat(locale);
      }
  
      protected DateFormat dateFormat(Locale locale) {
          DateFormat dateFormat = localizedDateFormats.get(locale);
          if (null == dateFormat) {
              String s = localizedPattern(locale);
              dateFormat = new SimpleDateFormat(s);
              localizedDateFormats.putIfAbsent(locale, dateFormat);
          }
          return dateFormat;
      }
  
      protected String localizedPattern(Locale locale) {
          return config.localizedDateTimePattern(locale);
      }
  
  }
  