org.databene.commons.ExceptionMapper Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of databene-commons Show documentation
'databene commons' is an open source Java library by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.
The newest version!
/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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.databene.commons;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Field;
import java.lang.reflect.Constructor;
import java.beans.IntrospectionException;

/**
 * Wraps checked exceptions as unchecked exceptions of type ConfigurationError.
 * Created: 02.07.2006 07:44:23
 * @author Volker Bergmann
 */
public final class ExceptionMapper {

    /**
     * Maps method reflection related exceptions to ConfigurationExceptions
     * @param cause the exception that occurred
     * @param constructor the constructor that was involved in the cause
     * @return a ConfigurationError that maps the cause.
     */
    public static ConfigurationError configurationException(Exception cause, Constructor constructor) {
        String message;
        if (cause instanceof IllegalAccessException)
            message = "No access to constructor: " + constructor;
        else if (cause instanceof InvocationTargetException)
            message = "Internal exception in constructor: " + constructor;
        else if (cause instanceof InstantiationException)
            message = "Error in instantiation by constructor: " + constructor;
        else
            message = cause.getMessage();
        return new ConfigurationError(message, cause);
    }

    /**
     * Maps method reflection related exceptions to ConfigurationExceptions
     * @param cause the exception that occurred
     * @param method the method that was involved in the cause
     * @return a ConfigurationError that maps the cause.
     */
    public static ConfigurationError configurationException(Exception cause, Method method) {
        String message;
        if (cause instanceof IllegalAccessException)
            message = "No access to method: " + method;
        else if (cause instanceof InvocationTargetException)
            message = "Internal exception in method: " + method;
        else if (cause instanceof IntrospectionException)
            message = "Internal exception in method: " + method;
        else
            message = cause.getMessage();
        return new ConfigurationError(message, cause);
    }

    /**
     * Maps class reflection related exceptions to ConfigurationExceptions
     * @param cause the exception that occurred
     * @param type the class that was involved in the cause
     * @return a ConfigurationError that maps the cause.
     */
    public static ConfigurationError configurationException(Exception cause, Class type) {
        String message;
        if (cause instanceof IntrospectionException)
            message = "Introspection failed for class " + type;
        else if (cause instanceof InstantiationException)
            message = "Instantiation failed for class '" + type + "' Possibly it is abstract, the constructor not public, or no appropriate constructor is provided.";
        else if (cause instanceof IllegalAccessException)
            message = "Constructor not accessible for class " + type;
        else
            message = cause.getMessage();
        return new ConfigurationError(message, cause);
    }

    /**
     * Maps attribute reflection related exceptions to ConfigurationExceptions
     * @param cause the exception that occurred
     * @param field the field that was involved in the cause
     * @return a ConfigurationError that maps the cause.
     */
    public static ConfigurationError configurationException(Exception cause, Field field) {
        String message;
        if (cause instanceof IllegalAccessException)
            message = "No access to field: " + field;
        else if (cause instanceof NoSuchFieldException)
            message = "No such field found: " + field; 
        else
            message = cause.getMessage();
        return new ConfigurationError(message, cause);
    }

    /**
     * Maps exceptions to ConfigurationExceptions
     * @param cause the exception that occurred
     * @param name a characteristic identifier that was involved in the cause
     * @return a ConfigurationError that maps the cause.
     */
    public static ConfigurationError configurationException(Exception cause, String name) {
        String message;
        if (cause instanceof ClassNotFoundException)
            message = "Class not found: '" + name + "'";
        else if (cause instanceof NoSuchFieldException)
            message = "Field not found: '" + name + "'";
        else if (cause instanceof NoSuchMethodException)
            message = "Method not found: '" + name + "'";
        else
            message = cause.getMessage();
        return new ConfigurationError(message, cause);
    }
}