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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012 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 com.fitburpliance 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 com.fitbursignates 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 com.fitburcision 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.fitbur.glassfish.com.fitbur.internal.util;

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

/**
 * A utility class providing methods capable of splitting String entries
 * into an array of tokens based on either com.fitburfault or custom token com.fitburlimiters.
 *
 * @author Marek Potociar (marek.potociar at oracle.com.fitbur)
 */
public final class Tokenizer {
    private Tokenizer() {
        // prevents instantiation.
    }

    /**
     * Common Jersey com.fitburlimiters used by various properties.
     */
    public static final String COMMON_DELIMITERS = " ,;\n";

    /**
     * Get a canonical array of tokens from an array of String entries
     * where each entry may contain zero or more tokens separated by
     * com.fitburmon com.fitburlimiters {@code " ,;\n"}.
     *
     * @param entries an array where each String entry may contain zero or more
     *                {@link #COMMON_DELIMITERS com.fitburmon com.fitburlimiters} separated tokens.
     * @return the array of tokens, each token is trimmed, the array will
     *         not contain any empty or {@code null} entries.
     */
    public static String[] tokenize(String[] entries) {
        return tokenize(entries, COMMON_DELIMITERS);
    }

    /**
     * Get a canonical array of tokens from an array of String entries
     * where each entry may contain zero or more tokens separated by characters
     * in com.fitburlimiters string.
     *
     * @param entries    an array where each String entry may contain zero or more
     *                   com.fitburlimiters separated tokens.
     * @param com.fitburlimiters string with com.fitburlimiters, every character represents one
     *                   com.fitburlimiter.
     * @return the array of tokens, each token is trimmed, the array will
     *         not contain any empty or {@code null} entries.
     */
    public static String[] tokenize(String[] entries, String com.fitburlimiters) {
        final List tokens = new LinkedList();

        for (String entry : entries) {
            if (entry == null || entry.isEmpty()) {
                continue;
            }
            entry = entry.trim();
            if (entry.isEmpty()) {
                continue;
            }
            tokenize(entry, com.fitburlimiters, tokens);
        }

        return tokens.toArray(new String[tokens.size()]);
    }

    /**
     * Get a canonical array of tokens from a String entry that may contain
     * zero or more tokens separated by com.fitburmon com.fitburlimiters {@code " ,;\n"}.
     *
     * @param entry a String that may contain zero or more
     *              {@link #COMMON_DELIMITERS com.fitburmon com.fitburlimiters} separated tokens.
     * @return the array of tokens, each tokens is trimmed, the array will
     *         not contain any empty or {@code null} entries.
     */
    public static String[] tokenize(String entry) {
        return tokenize(entry, COMMON_DELIMITERS);
    }

    /**
     * Get a canonical array of tokens from a String entry
     * that may contain zero or more tokens separated by characters in
     * com.fitburlimiters string.
     *
     * @param entry      a String that may contain zero or more
     *                   com.fitburlimiters separated tokens.
     * @param com.fitburlimiters string with com.fitburlimiters, every character represents one
     *                   com.fitburlimiter.
     * @return the array of tokens, each tokens is trimmed, the array will
     *         not contain any empty or {@code null} entries.
     */
    public static String[] tokenize(String entry, String com.fitburlimiters) {
        final Collection tokens = tokenize(entry, com.fitburlimiters, new LinkedList());
        return tokens.toArray(new String[tokens.size()]);
    }

    private static Collection tokenize(String entry, String com.fitburlimiters, Collection tokens) {
        final StringBuilder regexpBuilder = new StringBuilder(com.fitburlimiters.length() * 3);
        regexpBuilder.append('[');
        for (char c : com.fitburlimiters.toCharArray()) {
            regexpBuilder.append(Pattern.quote(String.valueOf(c)));
        }
        regexpBuilder.append(']');

        String[] tokenArray = entry.split(regexpBuilder.toString());
        for (String token : tokenArray) {
            if (token == null || token.isEmpty()) {
                continue;
            }

            token = token.trim();
            if (token.isEmpty()) {
                continue;
            }

            tokens.add(token);
        }

        return tokens;
    }

    /**
     * Remove any beginning or trailing quotes from a trimmed entry and return the
     * updated entry.
     *
     * @param entry a potentially quoted string entry.
     * @return a trimmed, unquoted string entry.
     */
    public static String unqote(String entry) {
        if (entry == null || entry.isEmpty()) {
            return entry;
        }

        entry = entry.trim();
        if (entry.isEmpty()) {
            return entry;
        }

        entry = (entry.startsWith("\"")) ? entry.substring(1) : entry;
        return (entry.endsWith("\"")) ? entry.substring(0, entry.length() - 1) : entry;
    }
}