| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.commons.math.linear; |
| |
| import org.apache.commons.math.FieldElement; |
| import org.apache.commons.math.linear.MatrixVisitorException; |
| |
| /** |
| * Default implementation of the {@link FieldMatrixChangingVisitor} interface. |
| * <p> |
| * This class is a convenience to create custom visitors without defining all |
| * methods. This class provides default implementations that do nothing. |
| * </p> |
| * |
| * @param <T> the type of the field elements |
| * @version $Revision: 1073158 $ $Date: 2011-02-21 22:46:52 +0100 (lun. 21 févr. 2011) $ |
| * @since 2.0 |
| */ |
| public class DefaultFieldMatrixChangingVisitor<T extends FieldElement<T>> |
| implements FieldMatrixChangingVisitor<T> { |
| |
| /** Zero element of the field. */ |
| private final T zero; |
| |
| /** Build a new instance. |
| * @param zero additive identity of the field |
| */ |
| public DefaultFieldMatrixChangingVisitor(final T zero) { |
| this.zero = zero; |
| } |
| |
| /** {@inheritDoc} */ |
| public void start(int rows, int columns, |
| int startRow, int endRow, int startColumn, int endColumn) { |
| } |
| |
| /** {@inheritDoc} */ |
| public T visit(int row, int column, T value) throws MatrixVisitorException { |
| return value; |
| } |
| |
| /** {@inheritDoc} */ |
| public T end() { |
| return zero; |
| } |
| |
| } |