1 files changed, 62 insertions, 0 deletions
diff --git a/src/main/java/org/apache/commons/math/linear/DefaultFieldMatrixPreservingVisitor.java b/src/main/java/org/apache/commons/math/linear/DefaultFieldMatrixPreservingVisitor.java
new file mode 100644
index 0000000..e1fd606
--- /dev/null
+++ b/src/main/java/org/apache/commons/math/linear/DefaultFieldMatrixPreservingVisitor.java
@@ -0,0 +1,62 @@
+/*
+ * 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 FieldMatrixPreservingVisitor} 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 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)
+        throws MatrixVisitorException {
+    }
+
+    /** {@inheritDoc} */
+    public T end() {
+        return zero;
+    }
+
+}