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diff --git a/src/main/java/org/apache/commons/math/linear/DefaultRealMatrixPreservingVisitor.java b/src/main/java/org/apache/commons/math/linear/DefaultRealMatrixPreservingVisitor.java
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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.math.linear;
+
+import org.apache.commons.math.linear.MatrixVisitorException;
+
+/**
+ * Default implementation of the {@link RealMatrixPreservingVisitor} interface.
+ * <p>
+ * This class is a convenience to create custom visitors without defining all
+ * methods. This class provides default implementations that do nothing.
+ * </p>
+ *
+ * @version $Revision: 1073158 $ $Date: 2011-02-21 22:46:52 +0100 (lun. 21 févr. 2011) $
+ * @since 2.0
+ */
+public class DefaultRealMatrixPreservingVisitor implements RealMatrixPreservingVisitor {
+
+    /** {@inheritDoc} */
+    public void start(int rows, int columns,
+                      int startRow, int endRow, int startColumn, int endColumn) {
+    }
+
+    /** {@inheritDoc} */
+    public void visit(int row, int column, double value)
+        throws MatrixVisitorException {
+    }
+
+    /** {@inheritDoc} */
+    public double end() {
+        return 0;
+    }
+
+}