ContentTypeEvaluator.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.contenttype;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import ddf.catalog.pubsub.predicate.ContentTypePredicate;

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

    public static boolean evaluate(ContentTypeEvaluationCriteriaImpl ctec) {
        String methodName = "evaluate";
        LOGGER.debug("ENTERING: {}", methodName);

        ContentTypePredicate matchContentTypePredicate = ctec.getContentType();
        String matchType = matchContentTypePredicate.getType();
        String matchVersion = matchContentTypePredicate.getVersion();

        // the following block checks for asterisks in the Content Type and Version
        // if it has those, it replaces the asterisk with a dot then an asterisk.
        // Thus the matchType and matchValue now can be used as regular expressions
        // to handle the wildcard.
        if (matchType != null) {
            matchType = matchType.replaceAll("\\*", ".*");
        }

        if (matchVersion != null) {
            matchVersion = matchVersion.replaceAll("\\*", ".*");
        }

        String input = ctec.getInputContentType();
        LOGGER.debug("Match ContentType: {}", matchContentTypePredicate);

        String inputType;
        String inputVersion;

        //Check if both type and version are blank
        if (input == null || input.matches(",")) {
            inputType = "null";
            inputVersion = "null";
        } else {
            String[] inputTypeVersionPair = input.split(",");

            //Check if content type is blank. If yes, set to null.
            if (inputTypeVersionPair[0].isEmpty()) {
                inputType = "null";
            } else {
                inputType = inputTypeVersionPair[0];
            }

            //Check if version is blank. If yes, set to null.
            if (inputTypeVersionPair.length == 1) {
                inputVersion = "null";
            } else {
                inputVersion = inputTypeVersionPair[1];
            }
        }

        LOGGER.debug("inputType = {}, inputVersion = {}", inputType, inputVersion);
        LOGGER.debug("matchType = {}, matchVersion = {}", matchType, matchVersion);

        if (matchType != null && !matchType.isEmpty() && inputType.matches(matchType)) {

            if (matchVersion != null && !matchVersion.isEmpty() && !inputVersion.matches(
                    matchVersion)) {
                LOGGER.debug("EXITING: {} - returning false.  Did not match version.", methodName);
                return false;
            }

            LOGGER.debug("EXITING: {} - returning true.", methodName);
            return true;
        }

        LOGGER.debug("EXITING: {} - returning false.", methodName);

        return false;
    }

}