/*
* Licensed to 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;
import io.crate.metadata.ReplaceMode;
import io.crate.metadata.ReplacingSymbolVisitor;
import java.util.function.Function;
public final class FieldReplacer extends ReplacingSymbolVisitor<Function<? super Field, ? extends Symbol>> {
private final static FieldReplacer REPLACER = new FieldReplacer();
private FieldReplacer() {
super(ReplaceMode.COPY);
}
public static Symbol replaceFields(Symbol tree, Function<? super Field, ? extends Symbol> replaceFunc) {
if (tree == null) {
return null;
}
return REPLACER.process(tree, replaceFunc);
}
public static Function<? super Symbol, ? extends Symbol> bind(Function<? super Field, ? extends Symbol> replaceFunc) {
return st -> replaceFields(st, replaceFunc);
}
@Override
public Symbol visitField(Field field, Function<? super Field, ? extends Symbol> replaceFunc) {
return replaceFunc.apply(field);
}
}