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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  }