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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010-2013 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.jersey.moxy;

import java.util.LinkedList;
import java.util.List;
import java.util.regex.Pattern;

/**
 *
 * @author Jakub Podlesak
 */
class Helper {
    /**
     * Get a canonical array of String elements from a String array
     * where each entry may contain zero or more elements separated by ';'.
     *
     * @param elements an array where each String entry may contain zero or more
     *        ';' separated elements.
     * @return the array of elements, each element is trimmed, the array will
     *         not contain any empty or null entries.
     */
    /* package */static String[] getElements(String[] elements) {
        // keeping backwards compatibility
        return getElements(elements, ";");
    }

    /**
     * Get a canonical array of String elements from a String array
     * where each entry may contain zero or more elements separated by characters
     * in delimiters string.
     *
     * @param elements an array where each String entry may contain zero or more
     *        delimiters separated elements.
     * @param delimiters string with delimiters, every character represents one
     *        delimiter.
     * @return the array of elements, each element is trimmed, the array will
     *         not contain any empty or null entries.
     */
    /* package */static String[] getElements(String[] elements, String delimiters) {
        List es = new LinkedList();
        for (String element : elements) {
            if (element == null) continue;
            element = element.trim();
            if (element.length() == 0) continue;
            for (String subElement : getElements(element, delimiters)) {
                if (subElement == null || subElement.length() == 0) continue;
                es.add(subElement);
            }
        }
        return es.toArray(new String[es.size()]);
    }

    /**
     * Get a canonical array of String elements from a String
     * that may contain zero or more elements separated by characters in
     * delimiters string.
     *
     * @param elements a String that may contain zero or more
     *        delimiters separated elements.
     * @param delimiters string with delimiters, every character represents one
     *        delimiter.
     * @return the array of elements, each element is trimmed.
     */
    private static String[] getElements(String elements, String delimiters) {
        String regex = "[";
        for(char c : delimiters.toCharArray())
            regex += Pattern.quote(String.valueOf(c));
        regex += "]";

        String[] es = elements.split(regex);
        for (int i = 0; i < es.length; i++) {
            es[i] = es[i].trim();
        }
        return es;
    }

}