Caldavsync Sources: hack/model/TimeZoneRegistryImpl.java@6dcaece8ec41 (annotated)

hack/model/TimeZoneRegistryImpl.java@6dcaece8ec41 (annotated)

hack/model/TimeZoneRegistryImpl.java

Fri, 13 Feb 2015 23:45:37 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Fri, 13 Feb 2015 23:45:37 +0100
branch: ICAL4J_EMBED_1
changeset 18: 6dcaece8ec41
permissions: -rw-r--r--

Give up after a longwinded and unfruitful attempt to patch ical4j,
made difficult by the neverending graph of method calls leading up
to the NPE caused in getResource*() of the ResourceLoader class.

 /**
  * Copyright (c) 2012, Ben Fortuna
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  *  o Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *
  *  o Redistributions in binary form must reproduce the above copyright
  * notice, this list of conditions and the following disclaimer in the
  * documentation and/or other materials provided with the distribution.
  *
  *  o Neither the name of Ben Fortuna nor the names of any other contributors
  * may be used to endorse or promote products derived from this software
  * without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 package net.fortuna.ical4j.model;
 import java.io.IOException;
 import java.net.URL;
 import java.util.Map;
 import java.util.Properties;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import net.fortuna.ical4j.data.CalendarBuilder;
 import net.fortuna.ical4j.data.ParserException;
 import net.fortuna.ical4j.model.component.VTimeZone;
 import net.fortuna.ical4j.model.property.TzUrl;
 import net.fortuna.ical4j.util.CompatibilityHints;
 import net.fortuna.ical4j.util.Configurator;
 import net.fortuna.ical4j.util.ResourceLoader;
 import android.util.Log;
 import edu.emory.mathcs.backport.java.util.concurrent.ConcurrentHashMap;
 /**
  * $Id$
  *
  * Created on 18/09/2005
  *
  * The default implementation of a <code>TimeZoneRegistry</code>. This implementation will search the classpath for
  * applicable VTimeZone definitions used to back the provided TimeZone instances.
  * @author Ben Fortuna
  */
 public class TimeZoneRegistryImpl implements TimeZoneRegistry {
     private static final String DEFAULT_RESOURCE_PREFIX = "zoneinfo/";
     private static final Pattern TZ_ID_SUFFIX = Pattern.compile("(?<=/)[^/]*/[^/]*$");
     private static final String UPDATE_ENABLED = "net.fortuna.ical4j.timezone.update.enabled";
     private static final Map DEFAULT_TIMEZONES = new ConcurrentHashMap();
     private static final Properties ALIASES = new Properties();
     static {
         try {
             ALIASES.load(ResourceLoader.getResourceAsStream("tz.alias"));
         }
         catch (IOException ioe) {
 			Log.w("MSvB-Hack", "Error loading timezone aliases: " + ioe.getMessage());
         }
         try {
         	ALIASES.load(ResourceLoader.getResourceAsStream("/tz.alias"));
         }
         catch (Exception e) {
 			Log.d("MSvB-Hack", "Error loading custom timezone aliases: " + e.getMessage());
         }
     }
     private Map timezones;
     private String resourcePrefix;
     /**
      * Default constructor.
      */
     public TimeZoneRegistryImpl() {
         this(DEFAULT_RESOURCE_PREFIX);
     }
     /**
      * Creates a new instance using the specified resource prefix.
      * @param resourcePrefix a prefix prepended to classpath resource lookups for default timezones
      */
     public TimeZoneRegistryImpl(final String resourcePrefix) {
         this.resourcePrefix = resourcePrefix;
         timezones = new ConcurrentHashMap();
     }
     /**
      * {@inheritDoc}
      */
     public final void register(final TimeZone timezone) {
     	// for now we only apply updates to included definitions by default..
     	register(timezone, false);
     }
     /**
      * {@inheritDoc}
      */
     public final void register(final TimeZone timezone, boolean update) {
     	if (update) {
             // load any available updates for the timezone..
             timezones.put(timezone.getID(), new TimeZone(updateDefinition(timezone.getVTimeZone())));
     	}
     	else {
             timezones.put(timezone.getID(), timezone);
     	}
     }
     /**
      * {@inheritDoc}
      */
     public final void clear() {
         timezones.clear();
     }
     /**
      * {@inheritDoc}
      */
     public final TimeZone getTimeZone(final String id) {
         TimeZone timezone = (TimeZone) timezones.get(id);
         if (timezone == null) {
             timezone = (TimeZone) DEFAULT_TIMEZONES.get(id);
             if (timezone == null) {
                 // if timezone not found with identifier, try loading an alias..
                 final String alias = ALIASES.getProperty(id);
                 if (alias != null) {
                     return getTimeZone(alias);
                 }
                 else {
                     synchronized (DEFAULT_TIMEZONES) {
                     	// check again as it may be loaded now..
                     	timezone = (TimeZone) DEFAULT_TIMEZONES.get(id);
                     	if (timezone == null) {
                             try {
                                 final VTimeZone vTimeZone = loadVTimeZone(id);
                                 if (vTimeZone != null) {
                                     // XXX: temporary kludge..
                                     // ((TzId) vTimeZone.getProperties().getProperty(Property.TZID)).setValue(id);
                                     timezone = new TimeZone(vTimeZone);
                                     DEFAULT_TIMEZONES.put(timezone.getID(), timezone);
                                 }
                                 else if (CompatibilityHints.isHintEnabled(CompatibilityHints.KEY_RELAXED_PARSING)) {
                                     // strip global part of id and match on default tz..
                                     Matcher matcher = TZ_ID_SUFFIX.matcher(id);
                                     if (matcher.find()) {
                                         return getTimeZone(matcher.group());
                                     }
                                 }
                             }
                             catch (Exception e) {
                                 Log.w("MSvB-Hack", "Error occurred loading VTimeZone", e);
                             }
                     	}
                     }
                 }
             }
         }
         return timezone;
     }
     /**
      * Loads an existing VTimeZone from the classpath corresponding to the specified Java timezone.
      */
     private VTimeZone loadVTimeZone(final String id) throws IOException, ParserException {
         final URL resource = ResourceLoader.getResource(resourcePrefix + id + ".ics");
         if (resource != null) {
             final CalendarBuilder builder = new CalendarBuilder();
             final Calendar calendar = builder.build(resource.openStream());
             final VTimeZone vTimeZone = (VTimeZone) calendar.getComponent(Component.VTIMEZONE);
             // load any available updates for the timezone.. can be explicility disabled via configuration
             if (!"false".equals(Configurator.getProperty(UPDATE_ENABLED))) {
                 return updateDefinition(vTimeZone);
             }
             return vTimeZone;
         }
         return null;
     }
     /**
      * @param vTimeZone
      * @return
      */
     private VTimeZone updateDefinition(VTimeZone vTimeZone) {
         final TzUrl tzUrl = vTimeZone.getTimeZoneUrl();
         if (tzUrl != null) {
             try {
                 final CalendarBuilder builder = new CalendarBuilder();
                 final Calendar calendar = builder.build(tzUrl.getUri().toURL().openStream());
                 final VTimeZone updatedVTimeZone = (VTimeZone) calendar.getComponent(Component.VTIMEZONE);
                 if (updatedVTimeZone != null) {
                     return updatedVTimeZone;
                 }
             }
             catch (Exception e) {
                 Log.w("MSvB-Hack", "Unable to retrieve updates for timezone: " + vTimeZone.getTimeZoneId().getValue(), e);
             }
         }
         return vTimeZone;
     }
 }

Caldavsync Sources / annotate

hack/model/TimeZoneRegistryImpl.java@6dcaece8ec41 (annotated)

hack/model/TimeZoneRegistryImpl.java