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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); /** * Sets a contextual label-value pair into this context. *

* The pair will be added normally, but any existing label-value pair with * the same label is removed from the context. *

* * @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 setContextValue(String label, Object value); /** * 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 getContextValues(String label); /** * Retrieves the first available contextual data value associated with the label. * * @param label the label to get the contextual value for, may be {@code null} * @return the first contextual value associated with the label, may be {@code null} */ Object getFirstContextValue(String label); /** * Retrieves the full set of labels defined in the contextual data. * * @return the set of labels, not {@code null} */ Set getContextLabels(); /** * Retrieves the full list of label-value pairs defined in the contextual data. * * @return the list of pairs, not {@code null} */ List> getContextEntries(); /** * Gets the contextualized error message based on a base message. * This will add the context label-value pairs to the message. * * @param baseMessage the base exception message without context information appended * @return the exception message with context information appended, not {@code null} */ String getFormattedExceptionMessage(String baseMessage); }