1 | /*
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2 | * Licensed to the Apache Software Foundation (ASF) under one or more
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3 | * contributor license agreements. See the NOTICE file distributed with
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4 | * this work for additional information regarding copyright ownership.
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5 | * The ASF licenses this file to You under the Apache License, Version 2.0
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6 | * (the "License"); you may not use this file except in compliance with
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7 | * the License. You may obtain a copy of the License at
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8 | *
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9 | * http://www.apache.org/licenses/LICENSE-2.0
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10 | *
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11 | * Unless required by applicable law or agreed to in writing, software
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12 | * distributed under the License is distributed on an "AS IS" BASIS,
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13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 | * See the License for the specific language governing permissions and
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15 | * limitations under the License.
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16 | */
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17 |
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18 | package agents.anac.y2019.harddealer.math3.linear;
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19 |
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20 | /**
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21 | * Interface defining a visitor for matrix entries.
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22 | *
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23 | * @see DefaultRealMatrixChangingVisitor
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24 | * @since 2.0
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25 | */
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26 | public interface RealMatrixChangingVisitor {
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27 | /**
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28 | * Start visiting a matrix.
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29 | * <p>This method is called once before any entry of the matrix is visited.</p>
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30 | * @param rows number of rows of the matrix
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31 | * @param columns number of columns of the matrix
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32 | * @param startRow Initial row index
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33 | * @param endRow Final row index (inclusive)
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34 | * @param startColumn Initial column index
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35 | * @param endColumn Final column index (inclusive)
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36 | */
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37 | void start(int rows, int columns,
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38 | int startRow, int endRow, int startColumn, int endColumn);
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39 |
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40 | /**
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41 | * Visit one matrix entry.
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42 | * @param row row index of the entry
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43 | * @param column column index of the entry
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44 | * @param value current value of the entry
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45 | * @return the new value to be set for the entry
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46 | */
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47 | double visit(int row, int column, double value);
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48 |
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49 | /**
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50 | * End visiting a matrix.
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51 | * <p>This method is called once after all entries of the matrix have been visited.</p>
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52 | * @return the value that the <code>walkInXxxOrder</code> must return
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53 | */
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54 | double end();
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55 | }
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