com.github.ibole.infrastructure.common.exception.MoreThrowables.java Source code

Introduction

Here is the source code for com.github.ibole.infrastructure.common.exception.MoreThrowables.java

Source

/*
 * Copyright 2016-2017 the original author or authors.
 * 
 * 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 com.github.ibole.infrastructure.common.exception;

import com.google.common.base.Preconditions;
import com.google.common.base.Throwables;

import org.apache.commons.lang3.exception.ExceptionUtils;

import java.io.PrintWriter;
import java.io.StringWriter;

/*********************************************************************************************
 * .
 * 
 * 
 * <p>Copyright 2016, iBole Inc. All rights reserved.
 * 
 * <p>
 * </p>
 *********************************************************************************************/

/** 
 * Utility functions when interacting with {@link Throwables}. 
 * 
 *
 */

public final class MoreThrowables {
    /**
     * Throws {code t} if it is an instance of {@link RuntimeException} or {@link Error}.
     *
     * <p>This is intended to mimic Guava's method by the same name,
     *  but which is unavailable to us due to compatibility with older Guava versions
     *  (upgraded to Guava 20 or later).
     */
    public static void throwIfUnchecked(Throwable t) {
        Preconditions.checkNotNull(t);
        if (t instanceof RuntimeException) {
            throw (RuntimeException) t;
        }
        if (t instanceof Error) {
            throw (Error) t;
        }
    }

    /**
     * ErrorStackString.
     */
    public static String getStackTraceAsString(Throwable e) {
        if (e == null) {
            return "";
        }
        StringWriter stringWriter = new StringWriter();
        e.printStackTrace(new PrintWriter(stringWriter));
        return stringWriter.toString();
    }

    /**
     * Get root cause stack trace as string.
     * @param cause Throwable
     * @return the string of root cause stack trace
     */
    public static String getRootCauseStackTraceAsString(Throwable cause) {
        return getStackTraceAsString(ExceptionUtils.getRootCause(cause));
    }

    /**
     * Get Root Cause Message.
     * @param cause Throwable
     * @return the root cause message
     */
    public static String getRootCauseMessage(Throwable cause) {
        return ExceptionUtils.getRootCauseMessage(cause);
    }

    /**
     * ??.
     */
    @SuppressWarnings("unchecked")
    public static boolean isCausedBy(Exception ex, Class<? extends Exception>... causeExceptionClasses) {
        Throwable cause = ex.getCause();
        while (cause != null) {
            for (Class<? extends Exception> causeClass : causeExceptionClasses) {
                if (causeClass.isInstance(cause)) {
                    return true;
                }
            }
            cause = cause.getCause();
        }
        return false;
    }

    // Prevent instantiation
    private MoreThrowables() {
    }
}