de.rwth.dbis.acis.bazaar.service.exception.ExceptionHandler.java Source code

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Here is the source code for de.rwth.dbis.acis.bazaar.service.exception.ExceptionHandler.java

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/*
 *
 *  Copyright (c) 2014, RWTH Aachen University.
 *  For a list of contributors see the AUTHORS file at the top-level directory
 *  of this distribution.
 *
 *  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 de.rwth.dbis.acis.bazaar.service.exception;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import de.rwth.dbis.acis.bazaar.service.BazaarService;
import jodd.vtor.Violation;

import java.util.Collection;
import java.util.List;
import java.util.Objects;
import java.util.Set;

/**
 * @author Adam Gavronek <gavronek@dbis.rwth-aachen.de>
 * @since 10/6/2014
 */
public enum ExceptionHandler {
    INSTANCE;

    // Static getter
    public static ExceptionHandler getInstance() {
        return INSTANCE;
    }

    public BazaarException convert(Exception ex, ExceptionLocation location, ErrorCode errorCode, String message) {
        BazaarException bazaarException = new BazaarException(location);
        bazaarException.setErrorCode(errorCode);
        bazaarException.setMessage(ex.getMessage() + message);
        return bazaarException;
    }

    public void convertAndThrowException(Exception exception, ExceptionLocation location, ErrorCode errorCode)
            throws BazaarException {
        throw convert(exception, location, errorCode, "");
    }

    public void convertAndThrowException(Exception exception, ExceptionLocation location, ErrorCode errorCode,
            String message) throws BazaarException {
        throw convert(exception, location, errorCode, message);
    }

    public void convertAndThrowException(BazaarException bazaarEx) throws BazaarException {
        throw bazaarEx;
    }

    public String toJSON(BazaarException exception) {
        GsonBuilder builder = new GsonBuilder();
        builder.excludeFieldsWithoutExposeAnnotation();
        final Gson gson = builder.create();
        return gson.toJson(exception);
    }

    public void handleViolations(List<Violation> violations) throws BazaarException {
        BazaarException bazaarException = new BazaarException(ExceptionLocation.BAZAARSERVICE);
        bazaarException.setErrorCode(ErrorCode.VALIDATION);
        StringBuilder builder = new StringBuilder();
        for (Violation violation : violations) {
            builder.append(
                    "On " + violation.getName() + " constraint violation has been detected, because you sent "
                            + violation.getInvalidValue() + " and the problem: " + violation.toString());
        }

        bazaarException.setMessage(builder.toString());
        throw bazaarException;
    }

    public void throwException(ExceptionLocation location, ErrorCode errorCode, String message)
            throws BazaarException {
        BazaarException bazaarException = new BazaarException(location);
        bazaarException.setErrorCode(errorCode);
        bazaarException.setMessage(message);
        throw bazaarException;
    }
}