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.math.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 * @version $Revision: 778191 $ $Date: 2009-05-24 12:44:52 -0400 (Sun, 24 May 2009) $
28 * @since 2.0
29 */
30 public class DefaultRealMatrixChangingVisitor implements RealMatrixChangingVisitor {
31
32 /** {@inheritDoc} */
33 public void start(int rows, int columns,
34 int startRow, int endRow, int startColumn, int endColumn) {
35 }
36
37 /** {@inheritDoc} */
38 public double visit(int row, int column, double value)
39 throws MatrixVisitorException {
40 return value;
41 }
42
43 /** {@inheritDoc} */
44 public double end() {
45 return 0;
46 }
47
48 }