com.iggroup.oss.sample.web.controller.BaseController.java Source code

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/*
 * #%L
 * restdoc-sample
 * %%
 * Copyright (C) 2012 IG Group
 * %%
 * 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.
 * #L%
 */
package com.iggroup.oss.sample.web.controller;

import java.io.IOException;
import java.util.ArrayList;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.validation.ConstraintViolation;
import javax.validation.Validator;

import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.ResponseStatus;

import com.iggroup.oss.sample.web.controller.error.ValidationError;
import com.iggroup.oss.sample.web.controller.error.common.SampleError;
import com.iggroup.oss.sample.web.controller.error.common.SampleErrorList;
import com.iggroup.oss.sample.web.controller.exception.SampleException;

/**
 * Abstract base controller for sample controllers. Contains common validation
 * and exception handling functionality.
 */
@Component
@Controller
public abstract class BaseController {

    private static final Logger LOGGER = Logger.getLogger(BaseController.class);

    /**
     * Spring wired global bean validator
     */
    @Autowired
    private Validator globalValidator;

    /**
     * SampleException handler. Set the HTTP status and return a SampleErrorList
     * object
     * 
     * @param se the sample exception being handled
     * @param req HTTP request
     * @param res HTTP response
     * @return a JAXB friendly SampleErrorList
     * @throws IOException IO exception
     */
    @ExceptionHandler(SampleException.class)
    @ResponseBody
    public SampleErrorList exceptionHandler(SampleException se, HttpServletRequest req, HttpServletResponse res)
            throws IOException {

        LOGGER.debug("Handling:", se);
        res.setStatus(se.getHttpStatus());

        return new SampleErrorList(se.getErrors());

    }

    /**
     * Handler for illegal argument exceptions. Spring will convert this to an
     * HTTP 400 error.
     */
    @ExceptionHandler(IllegalArgumentException.class)
    @ResponseStatus(value = HttpStatus.BAD_REQUEST, reason = "validation error")
    public void veryBadRequest() {
    }

    /**
     * Validate the given object using the configured validator, throwing a
     * BusinessException if the object fails validation
     * 
     * @param o the object to be validated
     */
    protected void validate(Object o) {

        ArrayList<SampleError> errors = new ArrayList<SampleError>();
        for (ConstraintViolation<Object> violation : globalValidator.validate(o)) {

            errors.add(new ValidationError(violation.getLeafBean().getClass().getSimpleName(),
                    violation.getPropertyPath().toString(), violation.getInvalidValue().toString(),
                    violation.getRootBeanClass().getSimpleName()));
        }
        if (!errors.isEmpty()) {
            LOGGER.debug(errors);
            throw new SampleException(errors, HttpStatus.BAD_REQUEST);
        }

    }

}