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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.exception;

import java.util.List;
import java.util.Set;

import org.apache.commons.lang3.tuple.Pair;

/**
 * Allows the storage and retrieval of contextual information based on label-value
 * pairs for exceptions.
 * 
 * Implementations are expected to manage the pairs in a list-style collection
 * that keeps the pairs in the sequence of their addition.
 * 
 *
 * @see ContextedException
 * @see ContextedRuntimeException
 * @since 3.0
 */
public interface ExceptionContext {

    /**
     * Adds a contextual label-value pair into this context.
     * 
     * The pair will be added to the context, independently of an already
     * existing pair with the same label.
     * 
     *
     * @param label  the label of the item to add, {@code null} not recommended
     * @param value  the value of item to add, may be {@code null}
     * @return {@code this}, for method chaining, not {@code null}
     */
    ExceptionContext addContextValue(String label, Object value);

    /**
     * Retrieves the full list of label-value pairs defined in the contextual data.
     *
     * @return the list of pairs, not {@code null}
     */
    List> getContextEntries();

    /**
     * Retrieves the full set of labels defined in the contextual data.
     *
     * @return the set of labels, not {@code null}
     */
    Set getContextLabels();

    /**
     * Retrieves all the contextual data values associated with the label.
     *
     * @param label  the label to get the contextual values for, may be {@code null}
     * @return the contextual values associated with the label, never {@code null}
     */
    List