RunObjectAttributesExample.java

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/* *********************************************************************** *
 * project: org.matsim.*
 *                                                                         *
 * *********************************************************************** *
 *                                                                         *
 * copyright       : (C) 2010 by the members listed in the COPYING,        *
 *                   LICENSE and WARRANTY file.                            *
 * email           : info at matsim dot org                                *
 *                                                                         *
 * *********************************************************************** *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *   See also COPYING, LICENSE and WARRANTY file                           *
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 * *********************************************************************** */

package org.matsim.utils.objectattributes;

import java.util.ArrayList;
import java.util.List;

public class RunObjectAttributesExample {

    public static void main(String[] args) {
        // assume we're working with some links, e.g. in a network
        List<String> linkIds = new ArrayList<String>();
        linkIds.add("1");
        linkIds.add("2");
        linkIds.add("3");
        linkIds.add("4");

        // define some attributes
        ObjectAttributes linkAttributes = new ObjectAttributes();
        // read from file or create somehow else
        linkAttributes.putAttribute("1", "roadtype", "motorway");
        linkAttributes.putAttribute("1", "hasSpeedBumps", Boolean.TRUE);
        linkAttributes.putAttribute("2", "roadtype", "trunk");
        linkAttributes.putAttribute("2", "hasSpeedBumps", Boolean.TRUE);
        // do not define a roadtype for object "3"
        linkAttributes.putAttribute("3", "hasSpeedBumps", Boolean.FALSE);
        // do not define any attributes for object "4"

        // now do something useful, e.g. use the attributes for filtering
        filterByAttributes(linkIds, linkAttributes, "roadtype", "trunk");
        filterByAttributes(linkIds, linkAttributes, "hasSpeedBumps", true);
        filterByAttributes(linkIds, linkAttributes, "hasSpeedBumps", false);
    }

    public static void filterByAttributes(List<String> objectIds, ObjectAttributes objectAttributes, String attributeName, Object attributeValue) {
        System.out.println("filtering for " + attributeName + " = " + attributeValue);
        for (String id : objectIds) {
            Object o = objectAttributes.getAttribute(id, attributeName);
            if (attributeValue.equals(o)) {
                System.out.println("  " + id);
            }
        }
    }
}