XPathPredicate.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.predicate;

import org.osgi.service.event.Event;
import org.w3c.dom.Document;

import ddf.catalog.pubsub.criteria.contextual.XPathEvaluationCriteria;
import ddf.catalog.pubsub.criteria.contextual.XPathEvaluationCriteriaImpl;
import ddf.catalog.pubsub.criteria.contextual.XPathEvaluator;
import ddf.catalog.pubsub.internal.PubSubConstants;

public class XPathPredicate implements Predicate {
    private String xpath;

    public XPathPredicate(String xpath) {
        this.xpath = xpath;
    }

    public static boolean isXPath(String xpath) {
        return !xpath.isEmpty();
    }

    public String getXpath() {
        return xpath;
    }

    public boolean matches(Event properties) {
        XPathEvaluationCriteria xec = new XPathEvaluationCriteriaImpl(
                (Document) properties.getProperty(PubSubConstants.HEADER_XPATH_KEY), xpath);

        return XPathEvaluator.evaluate(xec);
    }

    public String toString() {
        StringBuffer sb = new StringBuffer();
        sb.append("\txpath = " + xpath + "\n");

        return sb.toString();
    }

}