/*
* Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
* license agreements. See the NOTICE file distributed with this work for
* additional information regarding copyright ownership. Crate 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.
*
* However, if you have executed another commercial license agreement
* with Crate these terms will supersede the license and you may use the
* software solely pursuant to the terms of the relevant commercial agreement.
*/
package io.crate.analyze.symbol;
public abstract class DefaultTraversalSymbolVisitor<C, R> extends SymbolVisitor<C, R> {
/*
* These methods don't call into super to enable subclasses to use overwrite `visitSymbol` to visit all leaves.
* If we called super.visitXY here,
* it would cause visitSymbol to be called for Function, FetchReference and MatchPredicate as well.
*/
@Override
public R visitFunction(Function symbol, C context) {
for (Symbol arg : symbol.arguments()) {
process(arg, context);
}
return null;
}
@Override
public R visitFetchReference(FetchReference fetchReference, C context) {
process(fetchReference.fetchId(), context);
process(fetchReference.ref(), context);
return null;
}
@Override
public R visitMatchPredicate(MatchPredicate matchPredicate, C context) {
for (Field field : matchPredicate.identBoostMap().keySet()) {
process(field, context);
}
return null;
}
}