/*
* 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.parser;
import static org.krakenapps.bnf.Syntax.*;
import org.krakenapps.bnf.Binding;
import org.krakenapps.bnf.Parser;
import org.krakenapps.bnf.Syntax;
import org.krakenapps.logdb.LookupHandlerRegistry;
import org.krakenapps.logdb.LogQueryParser;
import org.krakenapps.logdb.query.StringPlaceholder;
import org.krakenapps.logdb.query.command.Lookup;
public class LookupParser implements LogQueryParser {
private LookupHandlerRegistry registry;
public LookupParser(LookupHandlerRegistry registry) {
this.registry = registry;
}
@Override
public void addSyntax(Syntax syntax) {
syntax.add("lookup", this, k("lookup "), ref("option"), new StringPlaceholder(), ref("lookup_field"),
k("OUTPUT"), ref("lookup_field"));
syntax.add("lookup_field", new LookupFieldParser(), new StringPlaceholder(),
option(k("as "), new StringPlaceholder()));
syntax.addRoot("lookup");
}
@Override
public Object parse(Binding b) {
String handlerName = (String) b.getChildren()[2].getValue();
LookupField src = (LookupField) b.getChildren()[3].getValue();
LookupField dst = (LookupField) b.getChildren()[5].getValue();
Lookup lookup = new Lookup(handlerName, src.first, src.second, dst.first, dst.second);
lookup.setLogQueryService(registry);
return lookup;
}
private class LookupField {
private String first;
private String second;
}
public class LookupFieldParser implements Parser {
@Override
public Object parse(Binding b) {
LookupField field = new LookupField();
if (b.getValue() != null) {
field.first = (String) b.getValue();
field.second = (String) b.getValue();
} else {
field.first = (String) b.getChildren()[0].getValue();
field.second = (String) b.getChildren()[1].getChildren()[1].getValue();
}
return field;
}
}
}