001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.wicket.util.parse.metapattern.parsers;
018
019import org.apache.wicket.util.parse.metapattern.MetaPattern;
020
021/**
022 * Parses out strings separated by commas.
023 * <p>
024 * Notes:
025 * <p>
026 * <ul>
027 * <li>It'll not trim the elements (it'll not remove whitespace)</li>
028 * <li>It is able to handle quotes like "a", 'b', "b,c" etc..</li>
029 * <li>But no escapes like "c\"d"</li>
030 * <li>Empty list elements like "a,," are not supported. It'll return the "a" only.</li>
031 * </ul>
032 * 
033 * @author Jonathan Locke
034 */
035public final class CommaSeparatedVariableParser extends ListParser
036{
037        /** Pattern to use. */
038        private static final MetaPattern patternEntry = new MetaPattern(
039                MetaPattern.OPTIONAL_WHITESPACE, MetaPattern.STRING, MetaPattern.OPTIONAL_WHITESPACE);
040
041        /**
042         * Construct a new parser with parameter 'input' to be parsed. Base classes provide the method
043         * to access the elements of the input parsed.
044         * 
045         * @param input
046         *            to parse
047         */
048        public CommaSeparatedVariableParser(final CharSequence input)
049        {
050                super(patternEntry, MetaPattern.COMMA, input);
051        }
052}