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This geoLatte-geom library offers a geometry model that conforms to the OGC Simple Features for SQL specification.

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package org.geolatte.geom;

public class LLAPositionVisitors {

    static public  LLAPositionVisitor mkCombiningVisitor(PositionSequenceBuilder
 builder){
        return new CombiningVisitor<>(builder);
    }
}

class CombiningVisitor
 implements LLAPositionVisitor {

    final PositionSequenceBuilder
 builder;

    CombiningVisitor(PositionSequenceBuilder
 builder) {
        this.builder = builder;
    }

    /**
     * The visit method that is executed for each coordinate.
     *
     * @param coordinate the visited coordinate in array representation
     */
    @Override
    public void visit(double[] coordinate) {
        this.builder.add(coordinate);
    }

    PositionSequence result() {
        return builder.toPositionSequence();
    }
}