001package biweekly.io;
002
003import java.io.FileNotFoundException;
004import java.io.IOException;
005import java.net.URI;
006import java.net.URISyntaxException;
007import java.util.Collections;
008import java.util.HashMap;
009import java.util.Map;
010import java.util.NoSuchElementException;
011import java.util.TimeZone;
012
013import biweekly.component.VTimezone;
014import biweekly.io.text.ICalReader;
015import biweekly.util.IOUtils;
016
017/*
018 Copyright (c) 2013-2015, Michael Angstadt
019 All rights reserved.
020
021 Redistribution and use in source and binary forms, with or without
022 modification, are permitted provided that the following conditions are met: 
023
024 1. Redistributions of source code must retain the above copyright notice, this
025 list of conditions and the following disclaimer. 
026 2. Redistributions in binary form must reproduce the above copyright notice,
027 this list of conditions and the following disclaimer in the documentation
028 and/or other materials provided with the distribution. 
029
030 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
031 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
032 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
033 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
034 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
035 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
036 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
037 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
038 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
039 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
040 */
041
042/**
043 * Downloads {@link VTimezone} components from <a
044 * href="http://www.tzurl.org">tzurl.org</a>.
045 * @author Michael Angstadt
046 */
047public class TzUrlDotOrgGenerator implements VTimezoneGenerator {
048        private static final Map<URI, VTimezone> cache = Collections.synchronizedMap(new HashMap<URI, VTimezone>());
049        private final String baseUrl;
050
051        /**
052         * Creates a new tzurl.org translator.
053         * @param outlook true to generate Outlook-compatible {@link VTimezone}
054         * components, false to use standards-based ones
055         */
056        public TzUrlDotOrgGenerator(boolean outlook) {
057                baseUrl = "http://www.tzurl.org/zoneinfo" + (outlook ? "-outlook" : "") + "/";
058        }
059
060        public VTimezone generate(TimeZone timezone) throws IllegalArgumentException {
061                URI uri;
062                try {
063                        uri = new URI(baseUrl + timezone.getID());
064                } catch (URISyntaxException e) {
065                        throw new IllegalArgumentException(e);
066                }
067
068                VTimezone component = cache.get(uri);
069                if (component != null) {
070                        return component;
071                }
072
073                ICalReader reader = null;
074                try {
075                        reader = new ICalReader(uri.toURL().openStream());
076                        reader.readNext();
077
078                        TimezoneInfo tzinfo = reader.getTimezoneInfo();
079                        component = tzinfo.getComponents().iterator().next();
080                        cache.put(uri, component);
081                        return component;
082                } catch (FileNotFoundException e) {
083                        throw notFound(e);
084                } catch (NoSuchElementException e) {
085                        throw notFound(e);
086                } catch (IOException e) {
087                        throw new RuntimeException(e);
088                } finally {
089                        IOUtils.closeQuietly(reader);
090                }
091        }
092
093        private IllegalArgumentException notFound(Exception e) {
094                return new IllegalArgumentException("Timezone ID not recognized.", e);
095        }
096}