com.panforge.robotstxt.WinningStrategy Maven / Gradle / Ivy
/*
* Copyright 2016 Piotr Andzel.
*
* 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.panforge.robotstxt;
import java.util.List;
/**
* Winning strategy.
*
* Determines how a winner will be selected.
* @see MatchingStrategy
*/
interface WinningStrategy {
/**
* Selects a single winner amongst the candidates.
* @param candidates list of candidates
* @return a winner or {@code null} if no winner (for example: because empty list of candidates)
*/
Access selectWinner(List candidates);
WinningStrategy DEFAULT = (candidates)->{
Access winningDisallow = candidates.stream().filter(acc->acc.hasAccess()==false).sorted((l,r)->r.getClause().length()-l.getClause().length()).findFirst().orElse(null);
Access winningAllow = candidates.stream().filter(acc->acc.hasAccess()==true).sorted((l,r)->r.getClause().length()-l.getClause().length()).findFirst().orElse(null);
if (winningAllow!=null && winningAllow.getClause().length()>=(winningDisallow!=null? winningDisallow.getClause().length(): 0)) {
return winningAllow;
}
if (winningDisallow!=null) {
return winningDisallow;
}
return null;
};
}