1 package org.djutils.data;
2
3 import org.djunits.Throw;
4 import org.djutils.immutablecollections.ImmutableList;
5
6 /**
7 * Abstract {@code Table} implementation taking care of the columns.
8 * <p>
9 * Copyright (c) 2020-2021 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
10 * BSD-style license. See <a href="https://djutils.org/docs/current/djutils/licenses.html">DJUTILS License</a>.
11 * </p>
12 * @author <a href="https://www.tudelft.nl/averbraeck">Alexander Verbraeck</a>
13 * @author <a href="https://www.tudelft.nl/pknoppers">Peter Knoppers</a>
14 */
15 public abstract class AbstractDataTable implements DataTable
16 {
17
18 /** Id. */
19 private final String id;
20
21 /** Description. */
22 private final String description;
23
24 /** Columns. */
25 private final ImmutableList<DataColumn<?>> columns;
26
27 /**
28 * Constructor for the data table using an ImmutableCollection for the columns.
29 * @param id String; id
30 * @param description String; description
31 * @param columns ImmutableList<DataColumn<?>>; columns
32 * @throws NullPointerException when id, description or columns is null
33 * @throws IllegalArgumentException when id is empty or there are zero columns
34 */
35 public AbstractDataTable(final String id, final String description, final ImmutableList<DataColumn<?>> columns)
36 {
37 Throw.whenNull(id, "Id may not be null.");
38 Throw.whenNull(description, "Description may not be null.");
39 Throw.whenNull(columns, "Columns may not be null.");
40 Throw.when(id.length() == 0, IllegalArgumentException.class, "id cannot be empty");
41 Throw.when(columns.size() == 0, IllegalArgumentException.class, "there should be at least one column");
42 this.id = id;
43 this.description = description;
44 this.columns = columns;
45 }
46
47 /** {@inheritDoc} */
48 @Override
49 public ImmutableList<DataColumn<?>> getColumns()
50 {
51 return this.columns;
52 }
53
54 /** {@inheritDoc} */
55 @Override
56 public String getId()
57 {
58 return this.id;
59 }
60
61 /** {@inheritDoc} */
62 @Override
63 public String getDescription()
64 {
65 return this.description;
66 }
67
68 }