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 import org.apache.commons.math.FieldElement; 21 import org.apache.commons.math.linear.MatrixVisitorException; 22 23 /** 24 * Interface defining a visitor for matrix entries. 25 * 26 * @param <T> the type of the field elements 27 * @version $Revision: 1073158 $ $Date: 2011-02-21 22:46:52 +0100 (lun. 21 févr. 2011) $ 28 * @since 2.0 29 */ 30 public interface FieldMatrixPreservingVisitor<T extends FieldElement<?>> { 31 32 /** 33 * Start visiting a matrix. 34 * <p>This method is called once before any entry of the matrix is visited.</p> 35 * @param rows number of rows of the matrix 36 * @param columns number of columns of the matrix 37 * @param startRow Initial row index 38 * @param endRow Final row index (inclusive) 39 * @param startColumn Initial column index 40 * @param endColumn Final column index (inclusive) 41 */ start(int rows, int columns, int startRow, int endRow, int startColumn, int endColumn)42 void start(int rows, int columns, 43 int startRow, int endRow, int startColumn, int endColumn); 44 45 /** 46 * Visit one matrix entry. 47 * @param row row index of the entry 48 * @param column column index of the entry 49 * @param value current value of the entry 50 * @throws MatrixVisitorException if something wrong occurs 51 */ visit(int row, int column, T value)52 void visit(int row, int column, T value) 53 throws MatrixVisitorException; 54 55 /** 56 * End visiting a matrix. 57 * <p>This method is called once after all entries of the matrix have been visited.</p> 58 * @return the value that the <code>walkInXxxOrder</code> must return 59 */ end()60 T end(); 61 62 } 63