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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) {
        StringBuilder sb = new StringBuilder();
        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();
    }

}