CollectionIdFunction.java example

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/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2017, Open Source Geospatial Foundation (OSGeo)
 *
 *    This library 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;
 *    version 2.1 of the License.
 *
 *    This library 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 org.geotools.data.mongodb.complex;

import org.geotools.filter.FunctionExpressionImpl;
import org.geotools.filter.capability.FunctionNameImpl;
import org.opengis.filter.capability.FunctionName;

import java.util.UUID;

import static org.geotools.filter.capability.FunctionNameImpl.parameter;

/**
 * Function that returns a random ID for a collection.
 */
public final class CollectionIdFunction extends FunctionExpressionImpl {

    private static final FunctionName DEFINITION = new FunctionNameImpl(
            "collectionId", parameter("value", Object.class), parameter("path", String.class));

    public CollectionIdFunction() {
        super(DEFINITION);
    }

    public Object evaluate(Object object) {
        return UUID.randomUUID().toString();
    }
}