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/*
 * Copyright 2002-2016 the original author or authors
 *
 * 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.github.springtestdbunit.dataset;

import java.io.InputStream;
import java.net.URL;

import org.dbunit.dataset.IDataSet;
import org.dbunit.dataset.xml.FlatXmlDataSet;
import org.dbunit.dataset.xml.FlatXmlDataSetBuilder;
import org.springframework.core.io.Resource;

/**
 * A {@link DataSetLoader data set loader} that can be used to load {@link FlatXmlDataSet FlatXmlDataSets}
 *
 * @author Phillip Webb
 */
public class FlatXmlDataSetLoader extends AbstractDataSetLoader {

	@Override
	protected IDataSet createDataSet(Resource resource) throws Exception {
		FlatXmlDataSetBuilder builder = new FlatXmlDataSetBuilder();
		builder.setColumnSensing(true);
		return buildDataSet(builder, resource);
	}

	private IDataSet buildDataSet(FlatXmlDataSetBuilder builder, Resource resource) throws Exception {
		try {
			// Prefer URL loading if possible so that DTDs can be resolved
			return buildDataSetFromUrl(builder, resource.getURL());
		} catch (Exception ex) {
			return buildDataSetFromStream(builder, resource);
		}
	}

	private IDataSet buildDataSetFromUrl(FlatXmlDataSetBuilder builder, URL url) throws Exception {
		return builder.build(url);
	}

	private IDataSet buildDataSetFromStream(FlatXmlDataSetBuilder builder, Resource resource) throws Exception {
		InputStream inputStream = resource.getInputStream();
		try {
			return builder.build(inputStream);
		} finally {
			inputStream.close();
		}
	}

}