/**
* Licensed to the Austrian Association for Software Tool Integration (AASTI)
* under one or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information regarding copyright
* ownership. The AASTI licenses this file to you 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 org.openengsb.connector.virtual.filewatcher.internal;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import org.openengsb.connector.virtual.filewatcher.FileSerializer;
import org.openengsb.core.api.model.OpenEngSBModelEntry;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.databind.MappingIterator;
import com.fasterxml.jackson.databind.ObjectWriter;
import com.fasterxml.jackson.dataformat.csv.CsvMapper;
import com.fasterxml.jackson.dataformat.csv.CsvSchema;
import com.google.common.collect.Lists;
public class CSVParser<ResultType> implements FileSerializer<ResultType> {
private final CsvMapper mapper;
private abstract class OpenEngSBModelMixin {
@JsonIgnore
abstract List<OpenEngSBModelEntry> getOpenEngSBModelTail();
}
private Class<ResultType> resultType;
public CSVParser(Class<ResultType> resultType) {
this.resultType = resultType;
mapper = new CsvMapper();
mapper.addMixInAnnotations(resultType, OpenEngSBModelMixin.class);
}
@Override
public List<ResultType> readFile(File path) throws IOException {
if (!path.exists()) {
return Collections.emptyList();
}
CsvSchema schema = mapper.schemaFor(resultType);
try {
MappingIterator<ResultType> iterator = mapper.reader(schema).withType(resultType)
.readValues(path);
return Lists.newArrayList(iterator);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
public void writeFile(File path, List<ResultType> models) throws IOException {
CsvSchema schema = mapper.schemaFor(resultType);
System.out.println(schema.getColumnDesc());
ObjectWriter writer = mapper.writer(schema);
// supplying the file directly does not work.
// java.lang.UnsupportedOperationException: Generator of type com.fasterxml.jackson.core.json.UTF8JsonGenerator
// does not support schema of type 'CSV'
writer.writeValue(new FileOutputStream(path), models);
}
}