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Commons for lang, crypto, xml, dom, text, csv, reflection, annotations, parsing, ...

There is a newer version: 4.3.3

/*
 * tksCommons
 * 
 * Author : Thomas Kuhlmann (ThK-Systems, http://www.thk-systems.de) License : LGPL (https://www.gnu.org/licenses/lgpl.html)
 */
package de.thksystems.util.lang;

import java.util.Optional;

import org.apache.commons.lang3.ClassUtils;

public final class ExceptionUtils {

	private ExceptionUtils() {
	}

	/**
	 * Returns a {@link String} of the {@link Throwable} like:
	 * 
	 * 	 * n.u.l.l.GeneralWorldFailure: You need to pray
	 * -> n.e.f.OrwellException: Big Brother is watching you
	 * -> abc.xyz.GoogleStillExistsException: null
	 * 
	 */
	public static String getMessageList(Throwable t) {
		StringBuffer sb = new StringBuffer();
		Throwable throwable = t;
		int depth = 0;
		while (throwable != null) {
			if (depth++ > 0) {
				sb.append("\n").append("--> ");
			}
			sb.append(ClassUtils.getAbbreviatedName(throwable.getClass(), 25)).append(": ").append(throwable.getMessage());
			throwable = throwable.getCause();
		}
		return sb.toString();
	}

	/**
	 * Returns true, if the given {@link Throwable} or one of its causes {@link Class}es is assignable from the given {@link Class}.
	 */
	public static boolean isOfTypeOrHasCauseWithType(Throwable t, Class expectedClass) {
		Throwable throwable = t;
		while (throwable != null) {
			if (expectedClass.isAssignableFrom(throwable.getClass())) {
				return true;
			}
			throwable = throwable.getCause();
		}
		return false;
	}

	/**
	 * Returns a causing exception or the exception itself, if it is of given type. (If any.)
	 */
	@SuppressWarnings("unchecked")
	public static  Optional getCauseWithType(Throwable t, Class expectedClass) {
		for (Throwable throwable = t; throwable != null; throwable = throwable.getCause()) {
			if (expectedClass.isAssignableFrom(throwable.getClass())) {
				return (Optional) Optional.of(throwable);
			}
		}
		return Optional.empty();
	}

}