1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * https://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 /*
19 * This is not the original file distributed by the Apache Software Foundation
20 * It has been modified by the Hipparchus project
21 */
22
23 package org.hipparchus.linear;
24
25 import org.hipparchus.FieldElement;
26
27 /**
28 * Default implementation of the {@link FieldMatrixPreservingVisitor} interface.
29 * <p>
30 * This class is a convenience to create custom visitors without defining all
31 * methods. This class provides default implementations that do nothing.
32 * </p>
33 *
34 * @param <T> the type of the field elements
35 */
36 public class DefaultFieldMatrixPreservingVisitor<T extends FieldElement<T>>
37 implements FieldMatrixPreservingVisitor<T> {
38 /** Zero element of the field. */
39 private final T zero;
40
41 /** Build a new instance.
42 * @param zero additive identity of the field
43 */
44 public DefaultFieldMatrixPreservingVisitor(final T zero) {
45 this.zero = zero;
46 }
47
48 /** {@inheritDoc} */
49 @Override
50 public void start(int rows, int columns,
51 int startRow, int endRow, int startColumn, int endColumn) {
52 }
53
54 /** {@inheritDoc} */
55 @Override
56 public void visit(int row, int column, T value) {}
57
58 /** {@inheritDoc} */
59 @Override
60 public T end() {
61 return zero;
62 }
63 }