ObjectAttributesUtils.java

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/* *********************************************************************** *
 * project: org.matsim.*
 *                                                                         *
 * *********************************************************************** *
 *                                                                         *
 * copyright       : (C) 2013 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                           *
 *                                                                         *
 * *********************************************************************** */

package org.matsim.utils.objectattributes;

import java.util.Collection;
import java.util.Collections;
import java.util.IdentityHashMap;
import java.util.Map;

public final class ObjectAttributesUtils {

    private ObjectAttributesUtils() {
        // abstract helper class
    }
    
    public static void copyAllAttributes(ObjectAttributes source, ObjectAttributes destination, String objectId) {
        Map<String, Object> sAttrs = source.attributes.get(objectId);
        if (sAttrs != null) {
            Map<String, Object> dAttrs = destination.attributes.get(objectId);
            if (dAttrs == null) {
                dAttrs = new IdentityHashMap<String, Object>();
                destination.attributes.put(objectId, dAttrs);
            }
            dAttrs.putAll(sAttrs);
        }
    }
    
    public static Collection<String> getAllAttributeNames(ObjectAttributes attributes, final String objectId) {
        Map<String, Object> map = attributes.attributes.get(objectId);
        if (map == null) {
            return Collections.emptyList();
        }
        return Collections.unmodifiableCollection(map.keySet());
    }

}