com.callidusrobotics.droptables.exception.HtmlBodyErrorWriter.java Source code

Introduction

Here is the source code for com.callidusrobotics.droptables.exception.HtmlBodyErrorWriter.java
Source

/**
 * Copyright (C) 2015 Rusty Gerard
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.callidusrobotics.droptables.exception;

import io.dropwizard.jersey.errors.ErrorMessage;

import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;

import org.apache.commons.io.Charsets;

/**
 * Converts error messages to text/html.
 *
 * @author Rusty Gerard
 * @since 0.0.1
 */
@Provider
@Produces(MediaType.TEXT_HTML)
public class HtmlBodyErrorWriter implements MessageBodyWriter<ErrorMessage> {

    @Override
    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return type.isAssignableFrom(ErrorMessage.class);
    }

    @Override
    public long getSize(ErrorMessage message, Class<?> type, Type genericType, Annotation[] annotations,
            MediaType mediaType) {
        return getData(message).getBytes(Charsets.UTF_8).length;
    }

    @Override
    public void writeTo(ErrorMessage message, Class<?> type, Type genericType, Annotation[] annotations,
            MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream)
            throws IOException, WebApplicationException {
        entityStream.write(getData(message).getBytes(Charsets.UTF_8));
    }

    protected String getData(ErrorMessage message) {
        StringBuilder builder = new StringBuilder();
        builder.append("<html><head><title>Error</title></head><body>");
        builder.append(message.getMessage());
        builder.append("</body></html>");

        return builder.toString();
    }
}