Example usage for org.apache.commons.collections4.iterators IteratorChain next

Introduction

In this page you can find the example usage for org.apache.commons.collections4.iterators IteratorChain next.

Prototype

public E next() 

Source Link

Document

Returns the next Object of the current Iterator

Usage

From source file:org.apache.jena.geosparql.spatial.property_functions.GenericSpatialPropertyFunction.java

private boolean checkBound(ExecutionContext execCxt, Node subject) {

    try {/*from  w  w  w. ja  va  2s.c om*/
        Graph graph = execCxt.getActiveGraph();

        IteratorChain<Triple> spatialTriples = new IteratorChain<>();

        //Check for Geometry and so GeometryLiterals.
        if (graph.contains(subject, Geo.HAS_GEOMETRY_NODE, null)) {
            //A Feature can have many geometries so add each of them. The check Geo.HAS_DEFAULT_GEOMETRY_NODE will only return one but requires the data to have these present.
            Iterator<Triple> geometryTriples = graph.find(subject, Geo.HAS_GEOMETRY_NODE, null);
            while (geometryTriples.hasNext()) {
                Node geometry = geometryTriples.next().getObject();
                spatialTriples.addIterator(graph.find(geometry, Geo.HAS_SERIALIZATION_NODE, null));
            }
        } else {
            //Check for Geo predicates against the feature when no geometry literals found.
            if (graph.contains(subject, SpatialExtension.GEO_LAT_NODE, null)
                    && graph.contains(subject, SpatialExtension.GEO_LON_NODE, null)) {
                Node lat = graph.find(subject, SpatialExtension.GEO_LAT_NODE, null).next().getObject();
                Node lon = graph.find(subject, SpatialExtension.GEO_LON_NODE, null).next().getObject();
                Node latLonGeometryLiteral = ConvertLatLon.toNode(lat, lon);
                Triple triple = new Triple(subject, Geo.HAS_GEOMETRY_NODE, latLonGeometryLiteral);
                spatialTriples.addIterator(Arrays.asList(triple).iterator());
            }
        }

        //Check through each Geometry and stop if one is accepted.
        boolean isMatched = false;
        while (spatialTriples.hasNext()) {

            Triple triple = spatialTriples.next();
            Node geometryLiteral = triple.getObject();
            GeometryWrapper targetGeometryWrapper = GeometryWrapper.extract(geometryLiteral);
            isMatched = checkSecondFilter(spatialArguments, targetGeometryWrapper);
            if (isMatched) {
                //Stop checking when match is true.
                break;
            }
        }

        return isMatched;
    } catch (DatatypeFormatException ex) {
        throw new ExprEvalException(ex.getMessage(), ex);
    }
}

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