| Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
| CachedTailoredQuery |
|
| 2.2;2.2 |
| 1 | /* | |
| 2 | * $Source$ | |
| 3 | * $Revision$ | |
| 4 | * | |
| 5 | * Copyright (C) 2000 William Chesters | |
| 6 | * | |
| 7 | * Part of Melati (http://melati.org), a framework for the rapid | |
| 8 | * development of clean, maintainable web applications. | |
| 9 | * | |
| 10 | * Melati is free software; Permission is granted to copy, distribute | |
| 11 | * and/or modify this software under the terms either: | |
| 12 | * | |
| 13 | * a) the GNU General Public License as published by the Free Software | |
| 14 | * Foundation; either version 2 of the License, or (at your option) | |
| 15 | * any later version, | |
| 16 | * | |
| 17 | * or | |
| 18 | * | |
| 19 | * b) any version of the Melati Software License, as published | |
| 20 | * at http://melati.org | |
| 21 | * | |
| 22 | * You should have received a copy of the GNU General Public License and | |
| 23 | * the Melati Software License along with this program; | |
| 24 | * if not, write to the Free Software Foundation, Inc., | |
| 25 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA to obtain the | |
| 26 | * GNU General Public License and visit http://melati.org to obtain the | |
| 27 | * Melati Software License. | |
| 28 | * | |
| 29 | * Feel free to contact the Developers of Melati (http://melati.org), | |
| 30 | * if you would like to work out a different arrangement than the options | |
| 31 | * outlined here. It is our intention to allow Melati to be used by as | |
| 32 | * wide an audience as possible. | |
| 33 | * | |
| 34 | * This program is distributed in the hope that it will be useful, | |
| 35 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 36 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 37 | * GNU General Public License for more details. | |
| 38 | * | |
| 39 | * Contact details for copyright holder: | |
| 40 | * | |
| 41 | * William Chesters <williamc At paneris.org> | |
| 42 | * http://paneris.org/~williamc | |
| 43 | * Obrechtstraat 114, 2517VX Den Haag, The Netherlands | |
| 44 | */ | |
| 45 | ||
| 46 | package org.melati.poem; | |
| 47 | ||
| 48 | import java.util.Enumeration; | |
| 49 | import java.util.Vector; | |
| 50 | import org.melati.poem.util.EnumUtils; | |
| 51 | ||
| 52 | /** | |
| 53 | * A cached instance of a {@link PreparedTailoredQuery}. | |
| 54 | * | |
| 55 | * @author WilliamC At paneris.org | |
| 56 | * | |
| 57 | */ | |
| 58 | public class CachedTailoredQuery extends PreparedTailoredQuery { | |
| 59 | ||
| 60 | 4 | private Vector<FieldSet> results = null; |
| 61 | 4 | private Vector<Object> firstRawResults = null; |
| 62 | private long[] tableSerials; | |
| 63 | ||
| 64 | /** | |
| 65 | * Full Constructor. | |
| 66 | * | |
| 67 | * @param modifier SQL modifier eg DISTINCT | |
| 68 | * @param selectedColumns An array of columns we know we need | |
| 69 | * @param otherTables Tables other than ours whose modification | |
| 70 | * state needs to be taken into account | |
| 71 | * @param whereClause Raw SQL | |
| 72 | * @param orderByClause Raw ORDER BY clause | |
| 73 | */ | |
| 74 | public CachedTailoredQuery(String modifier, | |
| 75 | Column<?>[] selectedColumns, Table<?>[] otherTables, | |
| 76 | String whereClause, String orderByClause) { | |
| 77 | 4 | super(modifier, selectedColumns, otherTables, whereClause, orderByClause); |
| 78 | 4 | tableSerials = new long[tables.length]; |
| 79 | 4 | } |
| 80 | ||
| 81 | /** | |
| 82 | * Constructor with modifier null. | |
| 83 | * | |
| 84 | * @param selectedColumns An array of columns we know we need | |
| 85 | * @param otherTables Tables other than ours whose modification | |
| 86 | * state needs to be taken into account | |
| 87 | * @param whereClause Raw SQL | |
| 88 | * @param orderByClause Raw ORDER BY clause | |
| 89 | */ | |
| 90 | public CachedTailoredQuery(Column<?>[] selectedColumns, Table<?>[] otherTables, | |
| 91 | String whereClause, String orderByClause) { | |
| 92 | 2 | this(null, selectedColumns, otherTables, whereClause, orderByClause); |
| 93 | 2 | } |
| 94 | ||
| 95 | /** | |
| 96 | * @return whether the underlying tables have changed since last run. | |
| 97 | */ | |
| 98 | protected boolean upToDate() { | |
| 99 | 9 | boolean is = true; |
| 100 | ||
| 101 | 9 | PoemTransaction transaction = PoemThread.transaction(); |
| 102 | 18 | for (int t = 0; t < tables.length; ++t) { |
| 103 | 9 | long currentSerial = tables[t].serial(transaction); |
| 104 | 9 | if (tableSerials[t] != currentSerial) { |
| 105 | 4 | is = false; |
| 106 | 4 | tableSerials[t] = currentSerial; |
| 107 | } | |
| 108 | } | |
| 109 | ||
| 110 | 9 | return is; |
| 111 | } | |
| 112 | ||
| 113 | /** | |
| 114 | * {@inheritDoc} | |
| 115 | * @see org.melati.poem.TailoredQuery#selection() | |
| 116 | */ | |
| 117 | public Enumeration<FieldSet> selection() { | |
| 118 | 7 | Vector<FieldSet> resultsLocal = this.results; |
| 119 | 7 | if (!upToDate() || resultsLocal == null) { |
| 120 | 3 | this.results = EnumUtils.vectorOf(super.selection()); |
| 121 | 3 | resultsLocal = this.results; |
| 122 | } | |
| 123 | 7 | return resultsLocal.elements(); |
| 124 | } | |
| 125 | ||
| 126 | /** | |
| 127 | * {@inheritDoc} | |
| 128 | * @see org.melati.poem.TailoredQuery#selection_firstRaw() | |
| 129 | */ | |
| 130 | public Enumeration<Object> selection_firstRaw() { | |
| 131 | 2 | Vector<Object> firstRawResultsLocal = this.firstRawResults; |
| 132 | 2 | if (!upToDate() || firstRawResultsLocal == null) { |
| 133 | 1 | this.firstRawResults = |
| 134 | 1 | EnumUtils.vectorOf(super.selection_firstRaw()); |
| 135 | 1 | firstRawResultsLocal = this.firstRawResults; |
| 136 | } | |
| 137 | 2 | return firstRawResultsLocal.elements(); |
| 138 | } | |
| 139 | } |