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 * http://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 package org.apache.commons.math4.legacy.linear;
19
20 /**
21 * Default implementation of the {@link RealMatrixChangingVisitor} interface.
22 * <p>
23 * This class is a convenience to create custom visitors without defining all
24 * methods. This class provides default implementations that do nothing.
25 * </p>
26 *
27 * @since 2.0
28 */
29 public class DefaultRealMatrixChangingVisitor implements RealMatrixChangingVisitor {
30 /** {@inheritDoc} */
31 @Override
32 public void start(int rows, int columns,
33 int startRow, int endRow, int startColumn, int endColumn) {
34 }
35
36 /** {@inheritDoc} */
37 @Override
38 public double visit(int row, int column, double value) {
39 return value;
40 }
41
42 /** {@inheritDoc} */
43 @Override
44 public double end() {
45 return 0;
46 }
47 }