com.threewks.thundr.view.csv.CsvViewResolver Maven / Gradle / Ivy

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A thundr module for working with csvs
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/*
 * This file is a component of thundr, a software library from 3wks.
 * Read more: http://3wks.github.io/thundr/
 * Copyright (C) 2014 3wks, 
 *
 * 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.threewks.thundr.view.csv;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

import com.opencsv.CSVWriter;
import com.opencsv.bean.MappingStrategy;
import com.threewks.thundr.csv.BeanToCsvStreamer;
import com.threewks.thundr.csv.CsvMappingFactory;
import com.threewks.thundr.request.Request;
import com.threewks.thundr.request.Response;
import com.threewks.thundr.transformer.TransformerManager;
import com.threewks.thundr.view.BaseView;
import com.threewks.thundr.view.ViewResolutionException;
import com.threewks.thundr.view.ViewResolver;

public class CsvViewResolver implements ViewResolver {
	private static final String[] EmptyStringArray = new String[0];
	private CsvMappingFactory mappingFactory;
	private TransformerManager transformerManager;

	public CsvViewResolver(TransformerManager transformerManager, CsvMappingFactory mappingFactory) {
		super();
		this.mappingFactory = mappingFactory;
		this.transformerManager = transformerManager;
	}

	@Override
	public void resolve(Request req, Response resp, CsvView viewResult) {
		BaseView.applyToResponse(viewResult, resp);
		resp.finaliseHeaders();
		try {
			PrintWriter writer = new PrintWriter(resp.getOutputStream());
			if (viewResult.getRowProvider() != null) {
				writeStringRows(viewResult, writer);
			} else {
				writeBeanRows(viewResult, writer);
			}
		} catch (IOException e) {
			throw new ViewResolutionException(e, "Failed to write to csv to response stream: %s", e.getMessage());
		}
	}

	protected void writeBeanRows(CsvView viewResult, PrintWriter writer) {
		Class