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RecursionHelper.java
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RecursionHelper.java
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/*
BusTO ("backend" components)
Copyright (C) 2016 Ludovico Pavesi
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package it.reyboz.bustorino.middleware;
/**
* Holds some global data used by recursive methods to try every fetcher until you get some data.<br>
* Well, those methods are now iterative but the name stuck...
*
* @param <FetcherKind> ArrivalsFetcher, StopsFinder, ...
*/
public class RecursionHelper<FetcherKind> {
private int pos = 0;
private final int len;
private final FetcherKind[] fetchers;
public RecursionHelper(FetcherKind[] fetchers) {
this.fetchers = fetchers;
this.len = fetchers.length;
}
/**
* Go back to square one. Or zero since arrays are zero-indexed.
*/
public void reset() {
this.pos = 0;
}
/**
* Can you give me a valid Fetcher without throwing exceptions?
*
* @return boolean
*/
public boolean valid() {
return this.pos < len;
}
/**
* Have we reached the end of the fetchers
* @return
*/
public boolean isLast(){
return this.pos ==len-1;
}
/**
* Give me a fetcher (use valid() to check that it exists BEFORE requesting it), move to next
*
* @return the fetcher\finder\whatever
*/
public FetcherKind getAndMoveForward() {
return fetchers[this.pos++];
}
}

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