001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018 package org.apache.commons.math.linear; 019 020 /** 021 * Default implementation of the {@link RealMatrixChangingVisitor} interface. 022 * <p> 023 * This class is a convenience to create custom visitors without defining all 024 * methods. This class provides default implementations that do nothing. 025 * </p> 026 * 027 * @version $Revision: 778191 $ $Date: 2009-05-24 12:44:52 -0400 (Sun, 24 May 2009) $ 028 * @since 2.0 029 */ 030 public class DefaultRealMatrixChangingVisitor implements RealMatrixChangingVisitor { 031 032 /** {@inheritDoc} */ 033 public void start(int rows, int columns, 034 int startRow, int endRow, int startColumn, int endColumn) { 035 } 036 037 /** {@inheritDoc} */ 038 public double visit(int row, int column, double value) 039 throws MatrixVisitorException { 040 return value; 041 } 042 043 /** {@inheritDoc} */ 044 public double end() { 045 return 0; 046 } 047 048 }