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+/*
+ * 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.math3.linear;
+
+import org.apache.commons.math3.FieldElement;
+
+/**
+ * Default implementation of the {@link FieldMatrixPreservingVisitor} interface.
+ *
+ * <p>This class is a convenience to create custom visitors without defining all methods. This class
+ * provides default implementations that do nothing.
+ *
+ * @param <T> the type of the field elements
+ * @since 2.0
+ */
+public class DefaultFieldMatrixPreservingVisitor<T extends FieldElement<T>>
+ implements FieldMatrixPreservingVisitor<T> {
+ /** Zero element of the field. */
+ private final T zero;
+
+ /**
+ * Build a new instance.
+ *
+ * @param zero additive identity of the field
+ */
+ public DefaultFieldMatrixPreservingVisitor(final T zero) {
+ this.zero = zero;
+ }
+
+ /** {@inheritDoc} */
+ public void start(
+ int rows, int columns, int startRow, int endRow, int startColumn, int endColumn) {}
+
+ /** {@inheritDoc} */
+ public void visit(int row, int column, T value) {}
+
+ /** {@inheritDoc} */
+ public T end() {
+ return zero;
+ }
+}