org.apache.maven.usability.diagnostics.DiagnosisUtils Maven / Gradle / Ivy

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package org.apache.maven.usability.diagnostics;

/*
* Copyright 2001-2005 The Apache Software Foundation.
*
* 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.
*/

public final class DiagnosisUtils
{
    private DiagnosisUtils()
    {
    }

    public static boolean containsInCausality( Throwable error, Class test )
    {
        Throwable cause = error;

        while ( cause != null )
        {
            if ( test.isInstance( cause ) )
            {
                return true;
            }

            cause = cause.getCause();
        }

        return false;
    }

    public static Throwable getRootCause( Throwable error )
    {
        Throwable cause = error;

        while ( true )
        {
            Throwable nextCause = cause.getCause();

            if ( nextCause == null )
            {
                break;
            }
            else
            {
                cause = nextCause;
            }
        }

        return cause;
    }

    public static Throwable getFromCausality( Throwable error, Class targetClass )
    {
        Throwable cause = error;

        while ( cause != null )
        {
            if ( targetClass.isInstance( cause ) )
            {
                return cause;
            }

            cause = cause.getCause();
        }

        return null;
    }

    public static void appendRootCauseIfPresentAndUnique( Throwable error, StringBuffer message,
                                                          boolean includeTypeInfo )
    {
        if ( error == null )
        {
            return;
        }
        
        Throwable root = getRootCause( error );

        if ( root != null && !root.equals( error ) )
        {
            String rootMsg = root.getMessage();

            if ( rootMsg != null && ( error.getMessage() == null || error.getMessage().indexOf( rootMsg ) < 0 ) )
            {
                message.append( "\n" ).append( rootMsg );

                if ( includeTypeInfo )
                {
                    message.append( "\nRoot error type: " ).append( root.getClass().getName() );
                }
            }
        }
    }
}