    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.math3.linear;
    019
    020    /**
    021     * Default implementation of the {@link RealMatrixPreservingVisitor} 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 $Id: DefaultRealMatrixPreservingVisitor.java 1416643 2012-12-03 19:37:14Z tn $
    028     * @since 2.0
    029     */
    030    public class DefaultRealMatrixPreservingVisitor implements RealMatrixPreservingVisitor {
    031        /** {@inheritDoc} */
    032        public void start(int rows, int columns,
    033                          int startRow, int endRow, int startColumn, int endColumn) {
    034        }
    035
    036        /** {@inheritDoc} */
    037        public void visit(int row, int column, double value) {}
    038
    039        /** {@inheritDoc} */
    040        public double end() {
    041            return 0;
    042        }
    043    }