io.mapzone.arena.analytics.graph.edgefunctions.CompareColumnsWithDirectEdgeFunction.java Source code

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Here is the source code for io.mapzone.arena.analytics.graph.edgefunctions.CompareColumnsWithDirectEdgeFunction.java

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/*
 * polymap.org Copyright (C) 2016, the @authors. All rights reserved.
 *
 * This is free software; you can redistribute it and/or modify it under the terms of
 * the GNU Lesser General Public License as published by the Free Software
 * Foundation; either version 3.0 of the License, or (at your option) any later
 * version.
 *
 * This software is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 */
package io.mapzone.arena.analytics.graph.edgefunctions;

import java.util.Collection;
import java.util.Map;

import org.eclipse.core.runtime.IProgressMonitor;
import org.opengis.feature.Feature;
import org.opengis.feature.simple.SimpleFeature;
import org.polymap.core.runtime.i18n.IMessages;
import org.polymap.rhei.batik.toolkit.md.MdToolkit;

import io.mapzone.arena.analytics.graph.Edge;
import io.mapzone.arena.analytics.graph.Graph;
import io.mapzone.arena.analytics.graph.Messages;
import io.mapzone.arena.analytics.graph.Node;

import com.google.common.collect.ArrayListMultimap;

/**
 * Edge function based on a distinct column with direct edges between the source
 * nodes.
 *
 * @author Steffen Stundzig
 */
public class CompareColumnsWithDirectEdgeFunction extends AbstractCompareColumnsEdgeFunction {

    private static final IMessages i18n = Messages.forPrefix("CompareColumnsWithDirectEdgeFunction");

    @Override
    public String title() {
        return i18n.get("title");
    }

    @Override
    public String description() {
        return i18n.get("description");
    }

    @Override
    public int generateEdges(final MdToolkit tk, final IProgressMonitor monitor, final Map<String, Node> nodes,
            final Graph graph) throws Exception {

        final ArrayListMultimap<Object, Node> edgesByKeyProperty = ArrayListMultimap.create();

        // iterate on features
        int featureCount = 0;
        for (Node sourceNode : nodes.values()) {
            Feature sourceFeature = sourceNode.feature();
            featureCount++;
            Object key = ((SimpleFeature) sourceFeature).getAttribute(selectedCompareProperty.getName());
            // compare only if a value is set
            if (key != null && !"".equals(key.toString().trim())) {
                edgesByKeyProperty.put(key, sourceNode);
            }
        }
        Collection<Edge> edges = transform(edgesByKeyProperty);
        for (Edge edge : edges) {
            graph.addOrUpdateEdge(edge);
        }
        return edges.size();
    }
}