1 /*
2 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package javafx.scene.control;
27
28 import java.lang.ref.WeakReference;
29
30 /**
31 * This class is used to represent a single row/column/cell in a table. Concrete
32 * subclasses of this abstract class are used in the {@link TableView} and
33 * {@link TreeTableView} APIs to represent which rows/columns/cells
34 * are currently selected, focused, being edited, etc. Note that this class is
35 * immutable once it is created.
36 *
37 * <p>Because the TableView and TreeTableView controls can have different
38 * {@link SelectionMode selection modes}, the row and column properties in
39 * TablePositionBase can be 'disabled' to represent an entire row or column. This is
40 * done by setting the unrequired property to -1 or null.
41 *
42 * @see TablePosition
43 * @see TreeTablePosition
44 * @since JavaFX 8.0
45 */
46 public abstract class TablePositionBase<TC extends TableColumnBase> {
47
48 /***************************************************************************
49 * *
50 * Constructors *
51 * *
52 **************************************************************************/
53
54 /**
55 * Constructs a TablePositionBase instance to represent the given row/column
56 * position in the underlying table instance (which is not part of the
57 * abstract TablePositionBase class, but is part of concrete subclasses such
58 * as {@link TablePosition} and {@link TreeTablePosition}). In all cases,
59 * all fields inside TablePositionBase instances are referenced weakly so as
60 * to prevent memory leaks. This means that it is possible (but unlikely)
61 * that the get methods will return null.
62 *
63 * @param row The row that this TablePosition is representing.
64 * @param tableColumn The TableColumn instance that this TablePosition represents.
65 */
66 protected TablePositionBase(int row, TC tableColumn) {
67 this.row = row;
68 this.tableColumnRef = new WeakReference<TC>(tableColumn);
69 }
70
71
72
73 /***************************************************************************
74 * *
75 * Instance Variables *
76 * *
77 **************************************************************************/
78
79 private final int row;
80 private final WeakReference<TC> tableColumnRef;
81
82
83
84 /***************************************************************************
85 * *
86 * Public API *
87 * *
88 **************************************************************************/
89
90 /**
91 * The row that this TablePosition represents in the TableView.
92 */
93 public int getRow() {
94 return row;
95 }
96
97 /**
98 * The column index that this TablePosition represents in the TableView. It
99 * is -1 if the TableView or TableColumn instances are null.
100 */
101 public abstract int getColumn();
102
103 /**
104 * The TableColumn that this TablePosition represents in the TableView.
105 */
106 public TC getTableColumn() {
107 return tableColumnRef.get();
108 }
109
110 /**
111 * Indicates whether some other object is "equal to" this one.
112 * @param obj the reference object with which to compare.
113 * @return {@code true} if this object is equal to the {@code obj} argument; {@code false} otherwise.
114 */
115 @Override public boolean equals(Object obj) {
116 if (obj == null) {
117 return false;
118 }
119 if (getClass() != obj.getClass()) {
120 return false;
121 }
122 @SuppressWarnings("unchecked")
123 final TablePositionBase other = (TablePositionBase) obj;
124 if (this.row != other.row) {
125 return false;
126 }
127 TC tableColumn = getTableColumn();
128 TableColumnBase otherTableColumn = other.getTableColumn();
129 if (tableColumn != otherTableColumn && (tableColumn == null || !tableColumn.equals(otherTableColumn))) {
130 return false;
131 }
132 return true;
133 }
134
135 /**
136 * Returns a hash code for this {@code TablePosition} object.
137 * @return a hash code for this {@code TablePosition} object.
138 */
139 @Override public int hashCode() {
140 int hash = 5;
141 hash = 79 * hash + this.row;
142 TableColumnBase tableColumn = getTableColumn();
143 hash = 79 * hash + (tableColumn != null ? tableColumn.hashCode() : 0);
144 return hash;
145 }
146 }