Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
NaryConstraint |
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| 0.0;0 |
1 | /* |
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2 | * SQLElements object-oriented SQL parsing and generation library |
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3 | * |
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4 | * Copyright (c) 2003, 2004, 2005 Israfil Consulting Services Corporation |
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5 | * Copyright (c) 2003, 2004, 2005 Christian Edward Gruber |
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6 | * All Rights Reserved |
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7 | * |
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8 | * This library is free software; you can redistribute it and/or modify |
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9 | * it under the terms of the GNU Lesser General Public License as published |
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10 | * by the Free Software Foundation; either version 2.1 of the License, or |
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11 | * (at your option) any later version. |
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12 | * |
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13 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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14 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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16 | * IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
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17 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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18 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, |
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19 | * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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20 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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21 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
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22 | * OF SUCH DAMAGE. |
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23 | * |
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24 | * You should have received a copy of the GNU Lesser General Public License |
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25 | * along with this library; if not, please visit http://www.gnu.org/licenses/lgpl.html |
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26 | * |
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27 | * $Id: NaryConstraint.java 27 2006-01-14 07:50:08 -0500 (Sat, 14 Jan 2006) cgruber $ |
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28 | */ |
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29 | package org.israfil.sqlelements.constraints; |
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30 | ||
31 | import java.util.Arrays; |
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32 | import java.util.Set; |
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33 | ||
34 | import net.israfil.foundation.collections.ArraySet; |
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35 | ||
36 | import org.israfil.sqlelements.render.SQLRenderContext; |
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37 | ||
38 | /** |
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39 | * N-ary Constraint |
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40 | * A friendly parent for constraints that can have an infinite |
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41 | * number of operands, such as and, or, etc. |
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42 | * i.e.: "(a=b) and (b=c) and (c=d)" is a valid SQL construction, but |
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43 | * can be represented (logically) by: and(condition1,condition2,condition3) |
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44 | * |
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45 | * @author <a href="mailto:cgruber@israfil.net">Christian Edward Gruber </a> |
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46 | * @author Latest: $Author: cgruber $ |
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47 | * @version $Revision: 27 $ |
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48 | */ |
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49 | public abstract class NaryConstraint implements ComplexConstraint |
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50 | { |
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51 | protected Constraint[] operands; |
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52 | protected String operatorText; |
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53 | ||
54 | protected NaryConstraint(String operatorText, Constraint ... operands) { |
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55 | 20 | this(operatorText,prepArray(operands)); |
56 | 20 | } |
57 | ||
58 | protected static Set<Constraint> prepArray(Constraint[] array) { |
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59 | 20 | Set<Constraint> s = new ArraySet<Constraint>(); |
60 | 20 | if (array != null) s.addAll(Arrays.asList(array)); |
61 | 20 | return s; |
62 | } |
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63 | 32 | protected NaryConstraint(String operatorText, Set<Constraint> operands) { |
64 | 32 | if (operands == null) operands = new ArraySet<Constraint>(0); |
65 | 32 | this.operatorText = operatorText; |
66 | 32 | Set<Constraint> constraintSet = new ArraySet<Constraint>(); |
67 | 32 | for (Constraint c : operands) { |
68 | 63 | if (c == null) continue; |
69 | 61 | if (this.getClass().equals(c.getClass())) { |
70 | 27 | for(Constraint sub : ((NaryConstraint)c).operands){ |
71 | 18 | constraintSet.add(sub); |
72 | } |
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73 | 9 | } |
74 | 52 | else constraintSet.add(c); |
75 | 61 | } |
76 | 32 | this.operands = constraintSet.toArray(new Constraint[constraintSet.size()]); |
77 | 32 | } |
78 | ||
79 | public String render(SQLRenderContext context) { |
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80 | 18 | boolean first = true; |
81 | 18 | String sql = ""; |
82 | 63 | for (Constraint c : this.operands) { |
83 | 45 | if (!first) { |
84 | 29 | sql += " "; |
85 | 29 | sql += operatorText; |
86 | 29 | sql += " "; |
87 | 29 | } |
88 | 16 | else first = false; |
89 | 45 | sql += ConstraintUtils.renderInParentheses(c,context); |
90 | } |
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91 | 18 | return sql; |
92 | } |
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93 | } |