XPathEvaluator.java

/**
 * Copyright (c) Codice Foundation
 * <p/>
 * 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 of the
 * License, or any later version.
 * <p/>
 * This program 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. A copy of the GNU Lesser General Public License
 * is distributed along with this program and can be found at
 * <http://www.gnu.org/licenses/lgpl.html>.
 */

package ddf.catalog.pubsub.criteria.contextual;

import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;

import ddf.util.XPathHelper;

public class XPathEvaluator {
    private static final Logger LOGGER = LoggerFactory.getLogger(XPathEvaluator.class);

    public static boolean evaluate(XPathEvaluationCriteria xpathCriteria) {
        Document document = xpathCriteria.getDocument();
        String xpath = xpathCriteria.getXPath();

        XPathHelper evaluator = new XPathHelper(document);

        try {
            return (Boolean) evaluator.evaluate(xpath, XPathConstants.BOOLEAN);

        } catch (XPathExpressionException e) {
            LOGGER.error("Unable to evaluate xpath", e);
        }

        return false;
    }

}