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A continuously growing collection of utilities to measure performance, get better diagnostics, improve performance, or do things more reliably, faster that other open source libraries...

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/*
 * Copyright (c) 2001-2017, Zoltan Farkas All Rights Reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * Additionally licensed with:
 *
 * Licensed 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.spf4j.base;

import java.lang.reflect.Field;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Collections;
import java.util.List;
import javax.annotation.ParametersAreNonnullByDefault;

/**
 *
 * @author Zoltan Farkas
 */
@ParametersAreNonnullByDefault
public final class UnsafeThrowable {

  private UnsafeThrowable() { }

  private static final Field SUPPRESSED_FIELD;

  static {
    SUPPRESSED_FIELD = AccessController.doPrivileged((PrivilegedAction) () -> {
      Field suppressedField;
      try {
        suppressedField = Throwable.class.getDeclaredField("suppressedExceptions");
      } catch (NoSuchFieldException | SecurityException ex) {
        throw new ExceptionInInitializerError(ex);
      }
      suppressedField.setAccessible(true);
      return suppressedField;
    });
  }

  public static List getSuppressedNoCopy(final Throwable t) {
        try {
      final List suppressedExceptions = (List) SUPPRESSED_FIELD.get(t);
      if (suppressedExceptions == null) {
        return Collections.emptyList();
      } else {
        return suppressedExceptions;
      }
    } catch (IllegalArgumentException | IllegalAccessException ex) {
      throw new RuntimeException(ex);
    }
  }


}