package io.sigpipe.sing.query;

import java.util.List;
import java.util.Set;

import io.sigpipe.sing.dataset.feature.FeatureType;
import io.sigpipe.sing.graph.DataContainer;
import io.sigpipe.sing.graph.Vertex;

public class MetaQuery extends Query {

    private DataContainer aggregateData = new DataContainer();

    public MetaQuery() {

    }

    public DataContainer result() {
        return aggregateData;
    }

    @Override
    public void execute(Vertex root)
    throws QueryException {
        this.query(root);
    }

    private void query(Vertex vertex)
    throws QueryException {
        DataContainer container = vertex.getData();
        if (container != null) {
            this.aggregateData.merge(container);
        }

        if (vertex.numNeighbors() == 0) {
            /* This is a leaf node */
            return;
        }

        String childFeature = vertex.getFirstNeighbor().getLabel().getName();
        List<Expression> expList = this.expressions.get(childFeature);
        if (expList != null) {
            Set<Vertex> matches = evaluate(vertex, expList);
            for (Vertex match : matches) {
                if (match == null) {
                    continue;
                }

                if (match.getLabel().getType() == FeatureType.NULL) {
                    continue;
                }

                query(match);
            }
        } else {
            /* No expression operates on this vertex. Consider all children. */
            for (Vertex neighbor : vertex.getAllNeighbors()) {
                query(neighbor);
            }
        }
    }
}


@@ -1,8 +1,1327 @@
+/*%0ACopyright (c) 2016, Colorado State University%0AAll rights reserved.%0A%0ARedistribution and use in source and binary forms, with or without modification,%0Aare permitted provided that the following conditions are met:%0A%0A1. Redistributions of source code must retain the above copyright notice, this%0A   list of conditions and the following disclaimer.%0A2. Redistributions in binary form must reproduce the above copyright notice,%0A   this list of conditions and the following disclaimer in the documentation%0A   and/or other materials provided with the distribution.%0A%0AThis software is provided by the copyright holders and contributors %22as is%22 and%0Aany express or implied warranties, including, but not limited to, the implied%0Awarranties of merchantability and fitness for a particular purpose are%0Adisclaimed. In no event shall the copyright holder or contributors be liable for%0Aany direct, indirect, incidental, special, exemplary, or consequential damages%0A(including, but not limited to, procurement of substitute goods or services;%0Aloss of use, data, or profits; or business interruption) however caused and on%0Aany theory of liability, whether in contract, strict liability, or tort%0A(including negligence or otherwise) arising in any way out of the use of this%0Asoftware, even if advised of the possibility of such damage.%0A*/%0A%0A
 package 

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