/* |
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* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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/* |
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* This file is available under and governed by the GNU General Public |
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* License version 2 only, as published by the Free Software Foundation. |
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* However, the following notice accompanied the original version of this |
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* file: |
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* |
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* Copyright (c) 2009-2012, Stephen Colebourne & Michael Nascimento Santos |
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* |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* * Redistributions of source code must retain the above copyright notice, |
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* this list of conditions and the following disclaimer. |
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* |
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* * Redistributions in binary form must reproduce the above copyright notice, |
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* this list of conditions and the following disclaimer in the documentation |
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* and/or other materials provided with the distribution. |
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* |
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* * Neither the name of JSR-310 nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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package java.time.zone; |
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import jdk.internal.util.StaticProperty; |
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import java.io.ByteArrayInputStream; |
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import java.io.BufferedInputStream; |
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import java.io.DataInputStream; |
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import java.io.File; |
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import java.io.FileInputStream; |
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import java.io.StreamCorruptedException; |
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import java.util.Arrays; |
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import java.util.HashSet; |
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import java.util.List; |
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import java.util.Map; |
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import java.util.NavigableMap; |
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import java.util.Set; |
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import java.util.TreeMap; |
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import java.util.concurrent.ConcurrentHashMap; |
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/** |
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* Loads time-zone rules for 'TZDB'. |
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* |
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* @since 1.8 |
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*/ |
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final class TzdbZoneRulesProvider extends ZoneRulesProvider { |
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/** |
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* All the regions that are available. |
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*/ |
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private List<String> regionIds; |
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/** |
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* Version Id of this tzdb rules |
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*/ |
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private String versionId; |
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/** |
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* Region to rules mapping |
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*/ |
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private final Map<String, Object> regionToRules = new ConcurrentHashMap<>(); |
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/** |
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* Creates an instance. |
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* Created by the {@code ServiceLoader}. |
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* |
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* @throws ZoneRulesException if unable to load |
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*/ |
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public TzdbZoneRulesProvider() { |
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try { |
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String libDir = StaticProperty.javaHome() + File.separator + "lib"; |
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try (DataInputStream dis = new DataInputStream( |
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new BufferedInputStream(new FileInputStream( |
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new File(libDir, "tzdb.dat"))))) { |
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load(dis); |
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} |
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} catch (Exception ex) { |
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throw new ZoneRulesException("Unable to load TZDB time-zone rules", ex); |
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} |
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} |
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@Override |
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protected Set<String> provideZoneIds() { |
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return new HashSet<>(regionIds); |
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} |
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@Override |
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protected ZoneRules provideRules(String zoneId, boolean forCaching) { |
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// forCaching flag is ignored because this is not a dynamic provider |
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Object obj = regionToRules.get(zoneId); |
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if (obj == null) { |
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throw new ZoneRulesException("Unknown time-zone ID: " + zoneId); |
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} |
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try { |
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if (obj instanceof byte[]) { |
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byte[] bytes = (byte[]) obj; |
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DataInputStream dis = new DataInputStream(new ByteArrayInputStream(bytes)); |
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obj = Ser.read(dis); |
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regionToRules.put(zoneId, obj); |
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} |
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return (ZoneRules) obj; |
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} catch (Exception ex) { |
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throw new ZoneRulesException("Invalid binary time-zone data: TZDB:" + zoneId + ", version: " + versionId, ex); |
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} |
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} |
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@Override |
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protected NavigableMap<String, ZoneRules> provideVersions(String zoneId) { |
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TreeMap<String, ZoneRules> map = new TreeMap<>(); |
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ZoneRules rules = getRules(zoneId, false); |
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if (rules != null) { |
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map.put(versionId, rules); |
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} |
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return map; |
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} |
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/** |
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* Loads the rules from a DateInputStream, often in a jar file. |
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* |
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* @param dis the DateInputStream to load, not null |
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* @throws Exception if an error occurs |
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*/ |
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private void load(DataInputStream dis) throws Exception { |
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if (dis.readByte() != 1) { |
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throw new StreamCorruptedException("File format not recognised"); |
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} |
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// group |
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String groupId = dis.readUTF(); |
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if ("TZDB".equals(groupId) == false) { |
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throw new StreamCorruptedException("File format not recognised"); |
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} |
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// versions |
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int versionCount = dis.readShort(); |
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for (int i = 0; i < versionCount; i++) { |
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versionId = dis.readUTF(); |
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} |
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// regions |
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int regionCount = dis.readShort(); |
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String[] regionArray = new String[regionCount]; |
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for (int i = 0; i < regionCount; i++) { |
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regionArray[i] = dis.readUTF(); |
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} |
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regionIds = Arrays.asList(regionArray); |
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// rules |
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int ruleCount = dis.readShort(); |
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Object[] ruleArray = new Object[ruleCount]; |
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for (int i = 0; i < ruleCount; i++) { |
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byte[] bytes = new byte[dis.readShort()]; |
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dis.readFully(bytes); |
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ruleArray[i] = bytes; |
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} |
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// link version-region-rules |
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for (int i = 0; i < versionCount; i++) { |
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int versionRegionCount = dis.readShort(); |
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regionToRules.clear(); |
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for (int j = 0; j < versionRegionCount; j++) { |
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String region = regionArray[dis.readShort()]; |
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Object rule = ruleArray[dis.readShort() & 0xffff]; |
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regionToRules.put(region, rule); |
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} |
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} |
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} |
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@Override |
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public String toString() { |
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return "TZDB[" + versionId + "]"; |
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} |
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} |