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org.apache.torque.util.UniqueList |
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1 | package org.apache.torque.util; |
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2 | ||
3 | /* |
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4 | * Licensed to the Apache Software Foundation (ASF) under one |
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5 | * or more contributor license agreements. See the NOTICE file |
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6 | * distributed with this work for additional information |
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7 | * regarding copyright ownership. The ASF licenses this file |
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8 | * to you under the Apache License, Version 2.0 (the |
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9 | * "License"); you may not use this file except in compliance |
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10 | * with the License. You may obtain a copy of the License at |
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11 | * |
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12 | * http://www.apache.org/licenses/LICENSE-2.0 |
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13 | * |
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14 | * Unless required by applicable law or agreed to in writing, |
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15 | * software distributed under the License is distributed on an |
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16 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
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17 | * KIND, either express or implied. See the License for the |
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18 | * specific language governing permissions and limitations |
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19 | * under the License. |
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20 | */ |
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21 | ||
22 | import java.util.ArrayList; |
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23 | ||
24 | /** |
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25 | * List with unique entries. UniqueList does not allow null nor duplicates. |
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26 | * |
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27 | * @author <a href="mailto:mpoeschl@marmot.at">Martin Poeschl</a> |
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28 | * @version $Id: UniqueList.java 473821 2006-11-11 22:37:25Z tv $ |
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29 | */ |
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30 | public class UniqueList extends ArrayList |
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31 | { |
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32 | /** |
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33 | * Serial version |
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34 | */ |
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35 | private static final long serialVersionUID = 4467847559423445120L; |
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36 | ||
37 | /** |
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38 | * Constructs an empty UniqueList. |
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39 | */ |
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40 | public UniqueList() |
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41 | 1560 | { |
42 | 1560 | } |
43 | ||
44 | /** |
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45 | * Copy-constructor. Creates a shallow copy of an UniqueList. |
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46 | * @param list the uniqueList to copy |
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47 | */ |
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48 | public UniqueList(UniqueList list) |
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49 | 42 | { |
50 | 42 | this.addAll(list); |
51 | 42 | } |
52 | ||
53 | /** |
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54 | * Adds an Object to the list. |
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55 | * |
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56 | * @param o the Object to add |
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57 | * @return true if the Object is added |
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58 | */ |
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59 | public boolean add(Object o) |
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60 | { |
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61 | 456 | if (o != null && !contains(o)) |
62 | { |
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63 | 444 | return super.add(o); |
64 | } |
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65 | 12 | return false; |
66 | } |
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67 | } |
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