com.github.palindromicity.syslog.Rfc3164SyslogParser Maven / Gradle / Ivy
/*
* Copyright 2018-2022 simple-syslog authors
* All rights reserved.
* 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.
*/
package com.github.palindromicity.syslog;
import com.github.palindromicity.syslog.dsl.DefaultErrorListener;
import com.github.palindromicity.syslog.dsl.Syslog3164Listener;
import com.github.palindromicity.syslog.dsl.generated.Rfc3164Lexer;
import com.github.palindromicity.syslog.dsl.generated.Rfc3164Parser;
import com.github.palindromicity.syslog.util.Validate;
import org.antlr.v4.runtime.CharStreams;
import org.antlr.v4.runtime.CommonTokenStream;
import org.jspecify.nullness.NullMarked;
/**
* {@link SyslogParser} for valid RFC 3164 syslog.
*/
@NullMarked
class Rfc3164SyslogParser extends AbstractSyslogParser {
SyslogSpecification specification;
/**
* Create a new {@code Rfc3164SyslogParser}.
*
* @param syslogBuilder {@link SyslogMessageConsumer} used gather data
*/
Rfc3164SyslogParser(AbstractSyslogMessageHandler syslogBuilder,
SyslogSpecification specification) {
super(syslogBuilder);
this.specification = specification;
}
@Override
public T parseLine(String syslogLine) {
Validate.notBlank(syslogLine, "syslogLine");
Rfc3164Lexer lexer = new Rfc3164Lexer(CharStreams.fromString(syslogLine));
lexer.removeErrorListeners();
lexer.addErrorListener(new DefaultErrorListener());
Rfc3164Parser parser = new Rfc3164Parser(new CommonTokenStream(lexer));
getSyslogBuilder().start();
Syslog3164Listener listener =
new Syslog3164Listener(getSyslogBuilder());
parser.addParseListener(listener);
parser.removeErrorListeners();
parser.addErrorListener(new DefaultErrorListener());
if (specification == SyslogSpecification.RFC_3164) {
parser.syslog_msg();
} else if (specification == SyslogSpecification.RFC_6587_3164) {
parser.octet_prefixed();
}
getSyslogBuilder().complete();
return getSyslogBuilder().produce();
}
}