/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.classactionpl.tz;
import java.io.InputStream;
import java.util.Map;
import org.antlr.runtime.ANTLRInputStream;
import org.antlr.runtime.CharStream;
import org.antlr.runtime.CommonTokenStream;
import org.antlr.runtime.tree.CommonTreeNodeStream;
import org.antlr.runtime.tree.Tree;
import org.apache.log4j.Logger;
/**
* Responsible for producing Zone objects from Zoneinfo streams.
*
* @author huntc
*
*/
public class ZoneFactory {
/** */
private static Logger logger = Logger.getLogger(ZoneFactory.class);
/**
* Given an input stream for a zoneinfo document, populate a map of parsed
* zoneinfo data keyed by the zone ids.
*
* @param zoneinfoStream
* the input stream to read in from.
* @param zones
* the zones to append to.
*/
public void parse(InputStream zoneinfoStream,
Map<String, AbstractZone> zones) {
try {
CharStream input = new ANTLRInputStream(zoneinfoStream);
ZoneinfoLexer lex = new ZoneinfoLexer(input);
CommonTokenStream tokens = new CommonTokenStream(lex);
ZoneinfoParser parser = new ZoneinfoParser(tokens);
ZoneinfoParser.line_return root = parser.line();
if (logger.isTraceEnabled()) {
logger.trace("tree=" + ((Tree) root.tree).toStringTree());
}
CommonTreeNodeStream nodes = new CommonTreeNodeStream(root.tree);
nodes.setTokenStream(tokens);
ZoneinfoWalker walker = new ZoneinfoWalker(nodes);
walker.setZones(zones);
walker.line();
} catch (Throwable t) {
logger.error("During zoneinfo parsing:", t);
}
}
}