/*

 * 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;

    }

}