Update #0 - First Release

sources/main/java/org/apache/commons/lang3/Charsets.java

@@ -0,0 +1,76 @@
+/*
+ * 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.lang3;
+
+import java.nio.charset.Charset;
+import java.nio.charset.UnsupportedCharsetException;
+
+/**
+ * Internal use only.
+ * <p>
+ * Provides utilities for {@link Charset}.
+ * </p>
+ * <p>
+ * Package private since Apache Commons IO already provides a Charsets because
+ * {@link Charset} is in {@code java.nio.charset}.
+ * </p>
+ *
+ * @since 3.10
+ */
+class Charsets {
+
+	/**
+	 * Returns the given {@code charset} or the default Charset if {@code charset}
+	 * is null.
+	 *
+	 * @param charset a Charset or null.
+	 * @return the given {@code charset} or the default Charset if {@code charset}
+	 *         is null.
+	 */
+	static Charset toCharset(final Charset charset) {
+		return charset == null ? Charset.defaultCharset() : charset;
+	}
+
+	/**
+	 * Returns the given {@code charset} or the default Charset if {@code charset}
+	 * is null.
+	 *
+	 * @param charsetName a Charset or null.
+	 * @return the given {@code charset} or the default Charset if {@code charset}
+	 *         is null.
+	 * @throws UnsupportedCharsetException If no support for the named charset is
+	 *                                     available in this instance of the Java
+	 *                                     virtual machine
+	 */
+	static Charset toCharset(final String charsetName) {
+		return charsetName == null ? Charset.defaultCharset() : Charset.forName(charsetName);
+	}
+
+	/**
+	 * Returns the given {@code charset} or the default Charset if {@code charset}
+	 * is null.
+	 *
+	 * @param charsetName a Charset or null.
+	 * @return the given {@code charset} or the default Charset if {@code charset}
+	 *         is null.
+	 */
+	static String toCharsetName(final String charsetName) {
+		return charsetName == null ? Charset.defaultCharset().name() : charsetName;
+	}
+
+}