fiftyone.mobile.detection.NearestScore Maven / Gradle / Ivy
/* *********************************************************************
* This Source Code Form is copyright of 51Degrees Mobile Experts Limited.
* Copyright © 2017 51Degrees Mobile Experts Limited, 5 Charlotte Close,
* Caversham, Reading, Berkshire, United Kingdom RG4 7BY
*
* This Source Code Form is the subject of the following patents and patent
* applications, owned by 51Degrees Mobile Experts Limited of 5 Charlotte
* Close, Caversham, Reading, Berkshire, United Kingdom RG4 7BY:
* European Patent No. 2871816;
* European Patent Application No. 17184134.9;
* United States Patent Nos. 9,332,086 and 9,350,823; and
* United States Patent Application No. 15/686,066.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0.
*
* If a copy of the MPL was not distributed with this file, You can obtain
* one at http://mozilla.org/MPL/2.0/.
*
* This Source Code Form is "Incompatible With Secondary Licenses", as
* defined by the Mozilla Public License, v. 2.0.
* ********************************************************************* */
package fiftyone.mobile.detection;
import java.io.IOException;
import fiftyone.mobile.detection.entities.Node;
import fiftyone.mobile.detection.entities.Signature;
/**
* Used to determine if all the signature node sub strings are in the target
* just at different character positions.
*
* This class should not be called as it is part of the internal logic.
*/
class NearestScore extends BaseScore {
@Override
protected int getInitialScore(Signature signature, int lastNodeCharacter)
throws IOException {
return 0;
}
/**
* If the sub string is contained in the target but in a different position
* return the difference between the two sub string positions.
* @param current working state of the matching process
* @param node
* @returns -1 if a score can't be determined, or the difference in
* positions
*/
@Override
protected int getScore(MatchState state, Node node) throws IOException {
int index = state.getIndexOf(node);
if (index >= 0) {
return Math.abs(node.position + 1 - index);
}
// Return -1 to indicate that a score could not be calculated.
return -1;
}
}