/**
* 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.bindy.kvp;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Scanner;
import org.apache.camel.Exchange;
import org.apache.camel.dataformat.bindy.BindyAbstractDataFormat;
import org.apache.camel.dataformat.bindy.BindyAbstractFactory;
import org.apache.camel.dataformat.bindy.BindyKeyValuePairFactory;
import org.apache.camel.dataformat.bindy.util.ConverterUtils;
import org.apache.camel.spi.DataFormat;
import org.apache.camel.spi.PackageScanClassResolver;
import org.apache.camel.util.IOHelper;
import org.apache.camel.util.ObjectHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A <a href="http://camel.apache.org/data-format.html">data format</a> (
* {@link DataFormat}) using Bindy to marshal to and from CSV files
*/
public class BindyKeyValuePairDataFormat extends BindyAbstractDataFormat {
private static final Logger LOG = LoggerFactory.getLogger(BindyKeyValuePairDataFormat.class);
public BindyKeyValuePairDataFormat() {
}
public BindyKeyValuePairDataFormat(String... packages) {
super(packages);
}
public BindyKeyValuePairDataFormat(Class<?> type) {
super(type);
}
@SuppressWarnings("unchecked")
public void marshal(Exchange exchange, Object body, OutputStream outputStream) throws Exception {
BindyAbstractFactory factory = getFactory(exchange.getContext().getPackageScanClassResolver());
List<Map<String, Object>> models = (ArrayList<Map<String, Object>>)body;
byte[] crlf;
// Get CRLF
crlf = ConverterUtils.getByteReturn(factory.getCarriageReturn());
for (Map<String, Object> model : models) {
String result = factory.unbind(model);
byte[] bytes = exchange.getContext().getTypeConverter().convertTo(byte[].class, exchange, result);
outputStream.write(bytes);
// Add a carriage return
outputStream.write(crlf);
}
}
public Object unmarshal(Exchange exchange, InputStream inputStream) throws Exception {
BindyKeyValuePairFactory factory = (BindyKeyValuePairFactory)getFactory(exchange.getContext().getPackageScanClassResolver());
// List of Pojos
List<Map<String, Object>> models = new ArrayList<Map<String, Object>>();
// Pojos of the model
Map<String, Object> model;
// Map to hold the model @OneToMany classes while binding
Map<String, List<Object>> lists = new HashMap<String, List<Object>>();
InputStreamReader in = new InputStreamReader(inputStream, IOHelper.getCharsetName(exchange));
// Scanner is used to read big file
Scanner scanner = new Scanner(in);
// Retrieve the pair separator defined to split the record
ObjectHelper.notNull(factory.getPairSeparator(), "The pair separator property of the annotation @Message");
String separator = factory.getPairSeparator();
int count = 0;
try {
while (scanner.hasNextLine()) {
// Read the line
String line = scanner.nextLine().trim();
if (ObjectHelper.isEmpty(line)) {
// skip if line is empty
continue;
}
// Increment counter
count++;
// Create POJO
model = factory.factory();
// Split the message according to the pair separator defined in
// annotated class @Message
List<String> result = Arrays.asList(line.split(separator));
if (result.size() == 0 || result.isEmpty()) {
throw new java.lang.IllegalArgumentException("No records have been defined in the KVP");
}
if (result.size() > 0) {
// Bind data from message with model classes
// Counter is used to detect line where error occurs
factory.bind(result, model, count, lists);
// Link objects together
factory.link(model);
// Add objects graph to the list
models.add(model);
LOG.debug("Graph of objects created: {}", model);
}
}
// Test if models list is empty or not
// If this is the case (correspond to an empty stream, ...)
if (models.size() == 0) {
throw new java.lang.IllegalArgumentException("No records have been defined in the CSV");
} else {
return extractUnmarshalResult(models);
}
} finally {
scanner.close();
IOHelper.close(in, "in", LOG);
}
}
protected BindyAbstractFactory createModelFactory(PackageScanClassResolver resolver) throws Exception {
if (getClassType() != null) {
return new BindyKeyValuePairFactory(resolver, getClassType());
} else {
return new BindyKeyValuePairFactory(resolver, getPackages());
}
}
}