/** Copyright by Barry G. Becker, 2000-2011. Licensed under MIT License: http://www.opensource.org/licenses/MIT */
package com.barrybecker4.game.twoplayer.go.board.update;
import com.barrybecker4.game.common.GameContext;
import com.barrybecker4.game.twoplayer.go.board.GoBoard;
import com.barrybecker4.game.twoplayer.go.board.GoProfiler;
import com.barrybecker4.game.twoplayer.go.board.analysis.neighbor.NeighborType;
import com.barrybecker4.game.twoplayer.go.board.elements.group.IGoGroup;
import com.barrybecker4.game.twoplayer.go.board.elements.position.GoBoardPosition;
import com.barrybecker4.game.twoplayer.go.board.elements.position.GoBoardPositionList;
import com.barrybecker4.game.twoplayer.go.board.elements.position.GoBoardPositionLists;
import com.barrybecker4.game.twoplayer.go.board.elements.position.GoBoardPositionSet;
import com.barrybecker4.game.twoplayer.go.board.elements.string.GoString;
import com.barrybecker4.game.twoplayer.go.board.elements.string.IGoString;
import com.barrybecker4.game.twoplayer.go.board.move.GoCaptureList;
import com.barrybecker4.game.twoplayer.go.board.move.GoMove;
/**
* Responsible for updating a go board after undoing a move.
*
* @author Barry Becker
*/
public class PostRemoveUpdater extends PostChangeUpdater {
PostRemoveUpdater(GoBoard board, CaptureCounts captures) {
super(board, captures);
}
/**
* Update strings and groups after a move was undone.
* @param move move that was just removed.
*/
@Override
public void update(GoMove move) {
profiler_.startUpdateGroupsAfterRemove();
// first make sure that there are no references to obsolete groups.
clearEyes();
GoBoardPosition stone = (GoBoardPosition) (getBoard().getPosition(move.getToLocation()));
IGoString stringThatItBelongedTo = stone.getString();
// clearing a stone may cause a string to split into smaller strings
stone.clear(getBoard());
board_.adjustLiberties(stone);
updateStringsAfterRemove( stone, stringThatItBelongedTo);
restoreCaptures(move.getCaptures());
profiler_.startRecreateGroupsAfterRemove();
recreateGroupsAfterChange();
profiler_.stopRecreateGroupsAfterRemove();
captureCounter_.updateCaptures(move, false);
profiler_.stopUpdateGroupsAfterRemove();
}
/**
* update the strings after a stone has been removed.
* Some friendly strings may have been split by the removal.
* @param stone that was removed.
* @param string that the stone belonged to.
*/
private void updateStringsAfterRemove( GoBoardPosition stone, IGoString string ) {
GoProfiler profiler = GoProfiler.getInstance();
profiler.startUpdateStringsAfterRemove();
// avoid error when calling from treeDlg
if (string == null) return;
splitStringsIfNeeded(stone, string);
if ( GameContext.getDebugMode() > 1 ) {
getAllGroups().confirmNoEmptyStrings();
validator_.confirmStonesInValidGroups();
}
profiler.stopUpdateStringsAfterRemove();
}
/**
* Make new string(s) if removing the stone has caused a larger string to be split.
* @param stone that was removed.
* @param string that the stone belonged to.
*/
private void splitStringsIfNeeded(GoBoardPosition stone, IGoString string) {
IGoGroup group = string.getGroup();
GoBoardPositionSet nbrs =
nbrAnalyzer_.getNobiNeighbors( stone, group.isOwnedByPlayer1(), NeighborType.FRIEND );
if ( nbrs.size() > 1 ) {
GoBoardPositionLists lists = new GoBoardPositionLists();
GoBoardPosition firstNbr = nbrs.getOneMember();
GoBoardPositionList stones = nbrAnalyzer_.findStringFromInitialPosition( firstNbr, false );
lists.add( stones );
for ( GoBoardPosition nbrStone : nbrs ) {
if ( !nbrStone.isVisited() ) {
GoBoardPositionList stones1 = nbrAnalyzer_.findStringFromInitialPosition( nbrStone, false );
IGoString newString = new GoString( stones1, getBoard() );
group.addMember(newString);
lists.add( stones1 );
}
}
lists.unvisitPositionsInLists();
}
}
/**
* restore this moves captures stones on the board
* @param captures list of captures to remove.
*/
private void restoreCaptures(GoCaptureList captures) {
if ( captures == null || captures.isEmpty() ) return;
captures.restoreOnBoard(board_);
if (GameContext.getDebugMode() > 1) {
validator_.confirmStonesInValidGroups();
getAllGroups().confirmAllStonesInUniqueGroups();
GameContext.log( 3, "GoBoard: undoInternalMove: " + getBoard() + " groups after restoring captures:" );
}
}
}