| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF 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.apache.camel.dataformat.univocity; |
| |
| import java.util.Arrays; |
| import java.util.LinkedHashSet; |
| import java.util.List; |
| import java.util.Map; |
| |
| import com.univocity.parsers.common.AbstractWriter; |
| import org.apache.camel.Exchange; |
| import org.apache.camel.NoTypeConversionAvailableException; |
| |
| import static org.apache.camel.support.ExchangeHelper.convertToMandatoryType; |
| import static org.apache.camel.support.ExchangeHelper.convertToType; |
| |
| /** |
| * This class marshalls the exchange body using an uniVocity writer. It can |
| * automatically generates headers and keep their order in memory. |
| * |
| * @param <W> Writer class |
| */ |
| final class Marshaller<W extends AbstractWriter<?>> { |
| private final LinkedHashSet<String> headers = new LinkedHashSet<>(); |
| private final boolean adaptHeaders; |
| |
| /** |
| * Creates a new instance. |
| * |
| * @param headers the base headers to use |
| * @param adaptHeaders whether or not we can add headers on the fly |
| * depending on the data |
| */ |
| Marshaller(String[] headers, boolean adaptHeaders) { |
| if (headers != null) { |
| this.headers.addAll(Arrays.asList(headers)); |
| } |
| this.adaptHeaders = adaptHeaders; |
| } |
| |
| /** |
| * Marshals the given body. |
| * |
| * @param exchange exchange to use (for type conversion) |
| * @param body body to marshal |
| * @param writer uniVocity writer to use |
| * @throws NoTypeConversionAvailableException when it's not possible to |
| * convert the body as list and maps. |
| */ |
| public void marshal(Exchange exchange, Object body, W writer) throws NoTypeConversionAvailableException { |
| try { |
| List<?> list = convertToType(exchange, List.class, body); |
| if (list != null) { |
| for (Object row : list) { |
| writeRow(exchange, row, writer); |
| } |
| } else { |
| writeRow(exchange, body, writer); |
| } |
| } finally { |
| writer.close(); |
| } |
| } |
| |
| /** |
| * Writes the given row. |
| * |
| * @param exchange exchange to use (for type conversion) |
| * @param row row to write |
| * @param writer uniVocity writer to use |
| * @throws NoTypeConversionAvailableException when it's not possible to |
| * convert the row as map. |
| */ |
| private void writeRow(Exchange exchange, Object row, W writer) throws NoTypeConversionAvailableException { |
| Map<?, ?> map = convertToMandatoryType(exchange, Map.class, row); |
| if (adaptHeaders) { |
| synchronized (headers) { |
| for (Object key : map.keySet()) { |
| headers.add(convertToMandatoryType(exchange, String.class, key)); |
| } |
| writeRow(map, writer); |
| } |
| } else { |
| writeRow(map, writer); |
| } |
| } |
| |
| /** |
| * Writes the given map as row. |
| * |
| * @param map row values by header |
| * @param writer uniVocity writer to use |
| */ |
| private void writeRow(Map<?, ?> map, W writer) { |
| Object[] values = new Object[headers.size()]; |
| int index = 0; |
| for (String header : headers) { |
| values[index++] = map.get(header); |
| } |
| writer.writeRow(values); |
| } |
| } |