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Apache Commons Lang, a package of Java utility classes for the classes that are in java.lang's hierarchy, or are considered to be so standard as to justify existence in java.lang. The code is tested using the latest revision of the JDK for supported LTS releases: 8, 11, 17 and 21 currently. See https://github.com/apache/commons-lang/blob/master/.github/workflows/maven.yml Please ensure your build environment is up-to-date and kindly report any build issues.

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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.lang3;

/**
 * Thrown to indicate that a block of code has not been implemented.
 * This exception supplements {@code UnsupportedOperationException}
 * by providing a more semantically rich description of the problem.
 *
 * {@code NotImplementedException} represents the case where the
 * author has yet to implement the logic at this point in the program.
 * This can act as an exception based TODO tag. 
 *
 *  * public void foo() {
 *   try {
 *     // do something that throws an Exception
 *   } catch (Exception ex) {
 *     // don't know what to do here yet
 *     throw new NotImplementedException("TODO", ex);
 *   }
 * }
 * 
 *
 * This class was originally added in Lang 2.0, but removed in 3.0.
 *
 * @since 3.2
 */
public class NotImplementedException extends UnsupportedOperationException {

    private static final long serialVersionUID = 20131021L;

    private final String code;

    /**
     * Constructs a NotImplementedException.
     *
     * @since 3.10
     */
    public NotImplementedException() {
        this.code = null;
    }

    /**
     * Constructs a NotImplementedException.
     *
     * @param message description of the exception
     * @since 3.2
     */
    public NotImplementedException(final String message) {
        this(message, (String) null);
    }

    /**
     * Constructs a NotImplementedException.
     *
     * @param cause cause of the exception
     * @since 3.2
     */
    public NotImplementedException(final Throwable cause) {
        this(cause, null);
    }

    /**
     * Constructs a NotImplementedException.
     *
     * @param message description of the exception
     * @param cause cause of the exception
     * @since 3.2
     */
    public NotImplementedException(final String message, final Throwable cause) {
        this(message, cause, null);
    }

    /**
     * Constructs a NotImplementedException.
     *
     * @param message description of the exception
     * @param code code indicating a resource for more information regarding the lack of implementation
     * @since 3.2
     */
    public NotImplementedException(final String message, final String code) {
        super(message);
        this.code = code;
    }

    /**
     * Constructs a NotImplementedException.
     *
     * @param cause cause of the exception
     * @param code code indicating a resource for more information regarding the lack of implementation
     * @since 3.2
     */
    public NotImplementedException(final Throwable cause, final String code) {
        super(cause);
        this.code = code;
    }

    /**
     * Constructs a NotImplementedException.
     *
     * @param message description of the exception
     * @param cause cause of the exception
     * @param code code indicating a resource for more information regarding the lack of implementation
     * @since 3.2
     */
    public NotImplementedException(final String message, final Throwable cause, final String code) {
        super(message, cause);
        this.code = code;
    }

    /**
     * Obtain the not implemented code. This is an unformatted piece of text intended to point to
     * further information regarding the lack of implementation. It might, for example, be an issue
     * tracker ID or a URL.
     *
     * @return a code indicating a resource for more information regarding the lack of implementation
     */
    public String getCode() {
        return this.code;
    }
}