/*
* Copyright 2011 Future Systems
*
* 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 org.krakenapps.logdb.query;
import java.text.ParseException;
import java.util.Collection;
import java.util.concurrent.CopyOnWriteArraySet;
import org.apache.felix.ipojo.annotations.Component;
import org.apache.felix.ipojo.annotations.Provides;
import org.apache.felix.ipojo.annotations.Validate;
import org.krakenapps.bnf.Syntax;
import org.krakenapps.logdb.LogQuery;
import org.krakenapps.logdb.LogQueryCommand;
import org.krakenapps.logdb.LogQueryParser;
import org.krakenapps.logdb.SyntaxProvider;
@Component(name = "logdb-syntax-provider")
@Provides
public class SyntaxProviderImpl implements SyntaxProvider {
private Syntax syntax;
private CopyOnWriteArraySet<LogQueryParser> queryParsers;
@Validate
public void start() {
queryParsers = new CopyOnWriteArraySet<LogQueryParser>();
}
@Override
public Syntax getSyntax() {
return syntax;
}
@Override
public LogQueryCommand eval(LogQuery logQuery, String query) throws ParseException {
LogQueryCommand token = (LogQueryCommand) syntax.eval(query);
token.setQueryString(query);
token.setLogQuery(logQuery);
return token;
}
@Override
public void addParsers(Collection<? extends LogQueryParser> parsers) {
queryParsers.addAll(parsers);
rebuild();
}
@Override
public void removeParsers(Collection<? extends LogQueryParser> parsers) {
queryParsers.removeAll(parsers);
rebuild();
}
private void rebuild() {
Syntax newSyntax = new Syntax();
for (LogQueryParser qp : queryParsers)
if (qp != null)
qp.addSyntax(newSyntax);
this.syntax = newSyntax;
}
}