[28] | 1 | /* |
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| 2 | * fmgVen - A Convention over Configuration Java ORM Tool |
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| 3 | * Copyright 2011 Fatih Mehmet Güler |
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| 4 | * |
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| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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| 6 | * you may not use this file except in compliance with the License. |
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| 7 | * 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 | * under the License. |
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| 17 | */ |
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| 18 | package com.fmguler.ven.util; |
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| 19 | |
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| 20 | import java.util.LinkedList; |
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| 21 | import java.util.List; |
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| 22 | |
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| 23 | /** |
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| 24 | * A Simple Linked List which informs the type of its elements. |
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| 25 | * @author Fatih Mehmet Güler |
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| 26 | */ |
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| 27 | public class VenList extends LinkedList { |
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| 28 | private Class elementClass; |
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| 29 | private String joinField; |
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| 30 | |
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| 31 | /** |
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| 32 | * Creates new instance of VenList |
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| 33 | */ |
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| 34 | public VenList() { |
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| 35 | } |
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| 36 | |
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| 37 | /** |
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| 38 | * Creates new instance of VenList, specifying the type of elements |
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| 39 | * @param elementClass the type of elements of this list |
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| 40 | */ |
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| 41 | public VenList(Class elementClass) { |
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| 42 | this.elementClass = elementClass; |
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| 43 | } |
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| 44 | |
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| 45 | /** |
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| 46 | * Creates new instance of VenList, specifying the type of elements and the join field |
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| 47 | * @param elementClass the type of elements of this list |
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| 48 | * @param joinField the field which refers to the parent object |
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| 49 | */ |
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| 50 | public VenList(Class elementClass, String joinField) { |
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| 51 | this.elementClass = elementClass; |
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| 52 | this.joinField = joinField; |
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| 53 | } |
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| 54 | |
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| 55 | /** |
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| 56 | * Returns the type of the elements in this list. |
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| 57 | * @return element type |
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| 58 | */ |
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| 59 | public Class getElementClass() { |
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| 60 | return elementClass; |
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| 61 | } |
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| 62 | |
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| 63 | /** |
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| 64 | * Returns the field in the element class which refers the parent object |
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| 65 | * @return element join field |
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| 66 | */ |
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| 67 | public String getJoinField() { |
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| 68 | return joinField; |
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| 69 | } |
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| 70 | |
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| 71 | /** |
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| 72 | * Return the class of the elements in the list |
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| 73 | * @param list the list |
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| 74 | * @return the element class in the list |
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| 75 | */ |
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| 76 | public static Class findElementClass(List list) { |
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| 77 | if (list.size() > 0) { |
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| 78 | Object elem = list.get(0); |
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| 79 | return elem.getClass(); |
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| 80 | } |
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| 81 | if (list instanceof VenList) { |
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| 82 | return ((VenList)list).getElementClass(); |
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| 83 | } else { |
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| 84 | //find according to 1.5 generic or some convention (e.g. xyzList -> xyz) |
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| 85 | return null; |
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| 86 | } |
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| 87 | } |
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| 88 | } |
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