| // |
| // ======================================================================== |
| // Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd. |
| // ------------------------------------------------------------------------ |
| // All rights reserved. This program and the accompanying materials |
| // are made available under the terms of the Eclipse Public License v1.0 |
| // and Apache License v2.0 which accompanies this distribution. |
| // |
| // The Eclipse Public License is available at |
| // http://www.eclipse.org/legal/epl-v10.html |
| // |
| // The Apache License v2.0 is available at |
| // http://www.opensource.org/licenses/apache2.0.php |
| // |
| // You may elect to redistribute this code under either of these licenses. |
| // ======================================================================== |
| // |
| |
| package org.eclipse.jetty.util; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| |
| /** |
| * Wraps multiple exceptions. |
| * |
| * Allows multiple exceptions to be thrown as a single exception. |
| */ |
| @SuppressWarnings("serial") |
| public class MultiException extends Exception |
| { |
| private List<Throwable> nested; |
| |
| /* ------------------------------------------------------------ */ |
| public MultiException() |
| { |
| super("Multiple exceptions"); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| public void add(Throwable e) |
| { |
| if (e==null) |
| throw new IllegalArgumentException(); |
| |
| if(nested == null) |
| { |
| initCause(e); |
| nested = new ArrayList<>(); |
| } |
| else |
| addSuppressed(e); |
| |
| if (e instanceof MultiException) |
| { |
| MultiException me = (MultiException)e; |
| nested.addAll(me.nested); |
| } |
| else |
| nested.add(e); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| public int size() |
| { |
| return (nested ==null)?0:nested.size(); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| public List<Throwable> getThrowables() |
| { |
| if(nested == null) |
| return Collections.emptyList(); |
| return nested; |
| } |
| |
| /* ------------------------------------------------------------ */ |
| public Throwable getThrowable(int i) |
| { |
| return nested.get(i); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** Throw a multiexception. |
| * If this multi exception is empty then no action is taken. If it |
| * contains a single exception that is thrown, otherwise the this |
| * multi exception is thrown. |
| * @exception Exception |
| */ |
| public void ifExceptionThrow() |
| throws Exception |
| { |
| if(nested == null) |
| return; |
| |
| switch (nested.size()) |
| { |
| case 0: |
| break; |
| case 1: |
| Throwable th=nested.get(0); |
| if (th instanceof Error) |
| throw (Error)th; |
| if (th instanceof Exception) |
| throw (Exception)th; |
| default: |
| throw this; |
| } |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** Throw a Runtime exception. |
| * If this multi exception is empty then no action is taken. If it |
| * contains a single error or runtime exception that is thrown, otherwise the this |
| * multi exception is thrown, wrapped in a runtime exception. |
| * @exception Error If this exception contains exactly 1 {@link Error} |
| * @exception RuntimeException If this exception contains 1 {@link Throwable} but it is not an error, |
| * or it contains more than 1 {@link Throwable} of any type. |
| */ |
| public void ifExceptionThrowRuntime() |
| throws Error |
| { |
| if(nested == null) |
| return; |
| |
| switch (nested.size()) |
| { |
| case 0: |
| break; |
| case 1: |
| Throwable th=nested.get(0); |
| if (th instanceof Error) |
| throw (Error)th; |
| else if (th instanceof RuntimeException) |
| throw (RuntimeException)th; |
| else |
| throw new RuntimeException(th); |
| default: |
| throw new RuntimeException(this); |
| } |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** Throw a multiexception. |
| * If this multi exception is empty then no action is taken. If it |
| * contains a any exceptions then this |
| * multi exception is thrown. |
| */ |
| public void ifExceptionThrowMulti() |
| throws MultiException |
| { |
| if(nested == null) |
| return; |
| |
| if (nested.size()>0) |
| throw this; |
| } |
| |
| /* ------------------------------------------------------------ */ |
| @Override |
| public String toString() |
| { |
| StringBuilder str = new StringBuilder(); |
| str.append(MultiException.class.getSimpleName()); |
| if((nested == null) || (nested.size()<=0)) { |
| str.append("[]"); |
| } else { |
| str.append(nested); |
| } |
| return str.toString(); |
| } |
| |
| } |