/*
    * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org> and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
    * SPDX-License-Identifier: BSD-3-Clause
    */
  
  package org.eclipse.jgit.errors;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.List;
  
  import org.eclipse.jgit.internal.JGitText;
  
  /**
   * An exception detailing multiple reasons for failure.
   */
  public class CompoundException extends Exception {
  	private static final long serialVersionUID = 1L;
  
  	private static String format(Collection<Throwable> causes) {
  		final StringBuilder msg = new StringBuilder();
  		msg.append(JGitText.get().failureDueToOneOfTheFollowing);
  		for (Throwable c : causes) {
  			msg.append("  "); //$NON-NLS-1$
  			msg.append(c.getMessage());
  			msg.append("\n"); //$NON-NLS-1$
  		}
  		return msg.toString();
  	}
  
  	private final List<Throwable> causeList;
  
  	/**
  	 * Constructs an exception detailing many potential reasons for failure.
  	 *
  	 * @param why
  	 *            Two or more exceptions that may have been the problem.
  	 */
  	public CompoundException(Collection<Throwable> why) {
  		super(format(why));
  		causeList = Collections.unmodifiableList(new ArrayList<>(why));
  	}
  
  	/**
  	 * Get the complete list of reasons why this failure happened.
  	 *
  	 * @return unmodifiable collection of all possible reasons.
  	 */
  	public List<Throwable> getAllCauses() {
  		return causeList;
  	}
  }