Make package private class final

Allow no instances of some internal classes

Author: garydgregory

src/main/java/org/apache/commons/csv/Constants.java

@@ -1,84 +1,89 @@
-/*
- * 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.csv;
-
-/**
- * Constants for this package.
- */
-final class Constants {
-
-    static final char BACKSLASH = '\\';
-
-    static final char BACKSPACE = '\b';
-
-    static final String COMMA = ",";
-
-    /**
-     * Starts a comment, the remainder of the line is the comment.
-     */
-    static final char COMMENT = '#';
-
-    static final char CR = '\r';
-
-    /** RFC 4180 defines line breaks as CRLF */
-    static final String CRLF = "\r\n";
-
-    static final Character DOUBLE_QUOTE_CHAR = Character.valueOf('"');
-
-    static final String EMPTY = "";
-
-    /** The end of stream symbol */
-    static final int END_OF_STREAM = -1;
-
-    static final char FF = '\f';
-
-    static final char LF = '\n';
-
-    /**
-     * Unicode line separator.
-     */
-    static final String LINE_SEPARATOR = "\u2028";
-
-    /**
-     * Unicode next line.
-     */
-    static final String NEXT_LINE = "\u0085";
-
-    /**
-     * Unicode paragraph separator.
-     */
-    static final String PARAGRAPH_SEPARATOR = "\u2029";
-
-    static final char PIPE = '|';
-
-    /** ASCII record separator */
-    static final char RS = 30;
-
-    static final char SP = ' ';
-
-    static final char TAB = '\t';
-
-    /** Undefined state for the lookahead char */
-    static final int UNDEFINED = -2;
-
-    /** ASCII unit separator */
-    static final char US = 31;
-
-    static final String[] EMPTY_STRING_ARRAY = {};
-
-}
+/*
+ * 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.csv;
+
+/**
+ * Constants for this package.
+ */
+final class Constants {
+
+    static final char BACKSLASH = '\\';
+
+    static final char BACKSPACE = '\b';
+
+    static final String COMMA = ",";
+
+    /**
+     * Starts a comment, the remainder of the line is the comment.
+     */
+    static final char COMMENT = '#';
+
+    static final char CR = '\r';
+
+    /** RFC 4180 defines line breaks as CRLF */
+    static final String CRLF = "\r\n";
+
+    static final Character DOUBLE_QUOTE_CHAR = Character.valueOf('"');
+
+    static final String EMPTY = "";
+
+    /** The end of stream symbol */
+    static final int END_OF_STREAM = -1;
+
+    static final char FF = '\f';
+
+    static final char LF = '\n';
+
+    /**
+     * Unicode line separator.
+     */
+    static final String LINE_SEPARATOR = "\u2028";
+
+    /**
+     * Unicode next line.
+     */
+    static final String NEXT_LINE = "\u0085";
+
+    /**
+     * Unicode paragraph separator.
+     */
+    static final String PARAGRAPH_SEPARATOR = "\u2029";
+
+    static final char PIPE = '|';
+
+    /** ASCII record separator */
+    static final char RS = 30;
+
+    static final char SP = ' ';
+
+    static final char TAB = '\t';
+
+    /** Undefined state for the lookahead char */
+    static final int UNDEFINED = -2;
+
+    /** ASCII unit separator */
+    static final char US = 31;
+
+    static final String[] EMPTY_STRING_ARRAY = {};
+
+    /** No instances. */
+    private Constants() {
+        // noop
+    }
+
+}