com.hpcloud.mon.resource.exception.JsonProcessingExceptionMapper.java Source code

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Here is the source code for com.hpcloud.mon.resource.exception.JsonProcessingExceptionMapper.java

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/*
 * Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
 *
 * 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.hpcloud.mon.resource.exception;

import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;
import javax.ws.rs.ext.ExceptionMapper;
import javax.ws.rs.ext.Provider;

import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.hpcloud.mon.resource.exception.Exceptions.FaultType;

/**
 * Adapted from Dropwizard's JsonProcessingExceptionMapper.
 */
@Provider
public class JsonProcessingExceptionMapper implements ExceptionMapper<JsonProcessingException> {
    @Override
    public Response toResponse(JsonProcessingException exception) {
        /*
         * If the error is in the JSON generation, it's a server error.
         */
        if (exception instanceof JsonGenerationException)
            return Response.status(Status.INTERNAL_SERVER_ERROR).type(MediaType.APPLICATION_JSON).entity(Exceptions
                    .buildLoggedErrorMessage(FaultType.SERVER_ERROR, "Error generating JSON", null, exception))
                    .build();

        final String message = exception.getMessage();

        /*
         * If we can't deserialize the JSON because someone forgot a no-arg constructor, it's a server
         * error and we should inform the developer.
         */
        if (message.startsWith("No suitable constructor found"))
            return Response.status(Status.INTERNAL_SERVER_ERROR).type(MediaType.APPLICATION_JSON)
                    .entity(Exceptions.buildLoggedErrorMessage(FaultType.SERVER_ERROR,
                            "Unable to deserialize the provided JSON", null, exception))
                    .build();

        /*
         * Otherwise, it's those pesky users.
         */
        return Response.status(Status.BAD_REQUEST).type(MediaType.APPLICATION_JSON)
                .entity(Exceptions.buildLoggedErrorMessage(FaultType.BAD_REQUEST,
                        "Unable to process the provided JSON", Exceptions.stripLocationFromStacktrace(message),
                        exception))
                .build();
    }
}