001    /*
002     * Jpkg - Java library and tools for operating system package creation.
003     *
004     * Copyright (c) 2007-2008 Three Rings Design, Inc.
005     * All rights reserved.
006     *
007     * Redistribution and use in source and binary forms, with or without
008     * modification, are permitted provided that the following conditions
009     * are met:
010     * 1. Redistributions of source code must retain the above copyright
011     *    notice, this list of conditions and the following disclaimer.
012     * 2. Redistributions in binary form must reproduce the above copyright
013     *    notice, this list of conditions and the following disclaimer in the
014     *    documentation and/or other materials provided with the distribution.
015     * 3. Neither the name of the copyright owner nor the names of contributors
016     *    may be used to endorse or promote products derived from this software
017     *    without specific prior written permission.
018     *
019     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
020     * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
021     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
022     * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
023     * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
024     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
025     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
026     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
027     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
028     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
029     * POSSIBILITY OF SUCH DAMAGE.
030     */
031    package com.threerings.antidote.property;
032    
033    import java.util.List;
034    
035    import com.threerings.antidote.field.Field;
036    
037    public class NonEmptyListProperty extends ListProperty
038    {
039        // from BaseProperty
040        public NonEmptyListProperty (String name, Field field)
041        {
042            super(name, field);
043        }
044    
045        // from BaseProperty
046        public NonEmptyListProperty (String name, Field field, List<String> defaultValue)
047        {
048            super(name, field, defaultValue);
049        }
050    
051        @Override // from ListProperty
052        protected List<String> validateProperty ()
053        {
054            final List<String> list = super.validateProperty();
055            if (wasSetBlank(list)) {
056                appendViolation(new EmptyListPropertyViolation(this));
057                return null;
058            }
059            return list;
060        }
061    
062        /**
063         * Returns true if the list was set by the user, but contains only the empty string.
064         */
065        private boolean wasSetBlank (List<String> list)
066        {
067            // if the user did not set a value, return false.
068            if (isNotSet()) {
069                return false;
070            }
071    
072            // if the list contains only one element and it is the empty string, return true.
073            if (list.size() == 1 && list.get(0).trim().equals("")) {
074                return true;
075            }
076    
077            return false;
078        }
079    }