    001// Copyright 2007, 2008 The Apache Software Foundation
    002//
    003// Licensed under the Apache License, Version 2.0 (the "License");
    004// you may not use this file except in compliance with the License.
    005// You may obtain a copy of the License at
    006//
    007//     http://www.apache.org/licenses/LICENSE-2.0
    008//
    009// Unless required by applicable law or agreed to in writing, software
    010// distributed under the License is distributed on an "AS IS" BASIS,
    011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    012// See the License for the specific language governing permissions and
    013// limitations under the License.
    014
    015package org.apache.tapestry5.upload.internal.services;
    016
    017import static org.apache.tapestry5.ioc.internal.util.CollectionFactory.newList;
    018
    019import java.util.List;
    020
    021/**
    022 * Holds single or multivalued values.
    023 */
    024public class ParameterValue
    025{
    026    private final List<String> values = newList();
    027
    028    public static final ParameterValue NULL = new ParameterValue()
    029    {
    030        @Override
    031        public String single()
    032        {
    033            return null;
    034        }
    035
    036        @Override
    037        public String[] multi()
    038        {
    039            return null;
    040        }
    041    };
    042
    043    public ParameterValue(String value)
    044    {
    045        values.add(value);
    046    }
    047
    048    public ParameterValue(String... values)
    049    {
    050        for (String v : values)
    051        {
    052            add(v);
    053        }
    054    }
    055
    056    /**
    057     * @return Single value of parameter (or first value if there are multiple values)
    058     */
    059    public String single()
    060    {
    061        return values.get(0);
    062    }
    063
    064    /**
    065     * @return All values of parameter
    066     */
    067    public String[] multi()
    068    {
    069        return values.toArray(new String[values.size()]);
    070    }
    071
    072    public void add(String value)
    073    {
    074        values.add(value);
    075    }
    076
    077    public boolean isMulti()
    078    {
    079        return values.size() > 1;
    080    }
    081}