Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
CollectionHelper |
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| 2.0;2 |
1 | /** |
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2 | * Licensed to the Apache Software Foundation (ASF) under one or more |
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3 | * contributor license agreements. See the NOTICE file distributed with |
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4 | * this work for additional information regarding copyright ownership. |
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5 | * The ASF licenses this file to You under the Apache License, Version 2.0 |
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6 | * (the "License"); you may not use this file except in compliance with |
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7 | * the License. You may obtain a copy of the License at |
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8 | * |
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9 | * http://www.apache.org/licenses/LICENSE-2.0 |
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10 | * |
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11 | * Unless required by applicable law or agreed to in writing, software |
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12 | * distributed under the License is distributed on an "AS IS" BASIS, |
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13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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14 | * See the License for the specific language governing permissions and |
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15 | * limitations under the License. |
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16 | */ |
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17 | package org.apache.camel.util; |
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18 | ||
19 | import java.util.ArrayList; |
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20 | import java.util.List; |
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21 | import java.util.Map; |
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22 | ||
23 | /** |
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24 | * A number of helper methods for working with collections |
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25 | * |
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26 | * @version $Revision: 1.1 $ |
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27 | */ |
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28 | public class CollectionHelper { |
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29 | ||
30 | /** |
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31 | * Utility classes should not have a public constructor. |
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32 | */ |
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33 | 0 | private CollectionHelper() { |
34 | 0 | } |
35 | ||
36 | /** |
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37 | * Sets the value of the entry in the map for the given key, though if the |
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38 | * map already contains a value for the given key then the value is appended |
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39 | * to a list of values. |
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40 | * |
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41 | * @param map the map to add the entry to |
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42 | * @param key the key in the map |
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43 | * @param value the value to put in the map |
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44 | */ |
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45 | public static void appendValue(Map map, Object key, Object value) { |
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46 | ||
47 | 0 | Object oldValue = map.get(key); |
48 | 0 | if (oldValue != null) { |
49 | List list; |
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50 | 0 | if (oldValue instanceof List) { |
51 | 0 | list = (List)oldValue; |
52 | 0 | } else { |
53 | 0 | list = new ArrayList(); |
54 | 0 | list.add(oldValue); |
55 | } |
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56 | 0 | list.add(value); |
57 | 0 | } else { |
58 | 0 | map.put(key, value); |
59 | } |
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60 | 0 | } |
61 | } |