100 lines
3.0 KiB
Java
100 lines
3.0 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.tomcat.util;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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/**
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* Wraps a list of throwables as a single throwable. This is intended to be used
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* when multiple actions are taken where each may throw an exception but all
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* actions are taken before any errors are reported.
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* <p>
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* This class is <b>NOT</b> threadsafe.
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*/
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public class MultiThrowable extends Throwable {
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private static final long serialVersionUID = 1L;
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private List<Throwable> throwables = new ArrayList<>();
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/**
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* Add a throwable to the list of wrapped throwables.
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*
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* @param t The throwable to add
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*/
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public void add(Throwable t) {
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throwables.add(t);
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}
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/**
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* @return A read-only list of the wrapped throwables.
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*/
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public List<Throwable> getThrowables() {
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return Collections.unmodifiableList(throwables);
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}
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/**
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* @return {@code null} if there are no wrapped throwables, the Throwable if
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* there is a single wrapped throwable or the current instance of
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* there are multiple wrapped throwables
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*/
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public Throwable getThrowable() {
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if (size() == 0) {
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return null;
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} else if (size() == 1) {
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return throwables.get(0);
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} else {
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return this;
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}
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}
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/**
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* @return The number of throwables currently wrapped by this instance.
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*/
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public int size() {
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return throwables.size();
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}
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/**
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* Overrides the default implementation to provide a concatenation of the
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* messages associated with each of the wrapped throwables. Note that the
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* format of the returned String is not guaranteed to be fixed and may
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* change in a future release.
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*/
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@Override
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public String toString() {
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StringBuilder sb = new StringBuilder();
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sb.append(super.toString());
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sb.append(": ");
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sb.append(size());
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sb.append(" wrapped Throwables: ");
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for (Throwable t : throwables) {
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sb.append("[");
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sb.append(t.getMessage());
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sb.append("]");
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}
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return sb.toString();
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}
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}
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