001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.camel.dataformat.bindy.kvp;
018
019 import java.io.InputStream;
020 import java.io.InputStreamReader;
021 import java.io.OutputStream;
022 import java.util.ArrayList;
023 import java.util.Arrays;
024 import java.util.HashMap;
025 import java.util.List;
026 import java.util.Map;
027 import java.util.Scanner;
028
029 import org.apache.camel.Exchange;
030 import org.apache.camel.dataformat.bindy.BindyAbstractDataFormat;
031 import org.apache.camel.dataformat.bindy.BindyAbstractFactory;
032 import org.apache.camel.dataformat.bindy.BindyKeyValuePairFactory;
033 import org.apache.camel.dataformat.bindy.util.Converter;
034 import org.apache.camel.spi.DataFormat;
035 import org.apache.camel.spi.PackageScanClassResolver;
036 import org.apache.camel.util.IOHelper;
037 import org.apache.camel.util.ObjectHelper;
038 import org.slf4j.Logger;
039 import org.slf4j.LoggerFactory;
040
041 /**
042 * A <a href="http://camel.apache.org/data-format.html">data format</a> (
043 * {@link DataFormat}) using Bindy to marshal to and from CSV files
044 */
045 public class BindyKeyValuePairDataFormat extends BindyAbstractDataFormat {
046
047 private static final transient Logger LOG = LoggerFactory.getLogger(BindyKeyValuePairDataFormat.class);
048
049 public BindyKeyValuePairDataFormat() {
050 }
051
052 public BindyKeyValuePairDataFormat(String... packages) {
053 super(packages);
054 }
055
056 @SuppressWarnings("unchecked")
057 public void marshal(Exchange exchange, Object body, OutputStream outputStream) throws Exception {
058 BindyAbstractFactory factory = getFactory(exchange.getContext().getPackageScanClassResolver());
059 List<Map<String, Object>> models = (ArrayList<Map<String, Object>>)body;
060 byte[] crlf;
061
062 // Get CRLF
063 crlf = Converter.getByteReturn(factory.getCarriageReturn());
064
065 for (Map<String, Object> model : models) {
066 String result = factory.unbind(model);
067 byte[] bytes = exchange.getContext().getTypeConverter().convertTo(byte[].class, exchange, result);
068 outputStream.write(bytes);
069
070 // Add a carriage return
071 outputStream.write(crlf);
072 }
073 }
074
075 public Object unmarshal(Exchange exchange, InputStream inputStream) throws Exception {
076 BindyKeyValuePairFactory factory = (BindyKeyValuePairFactory)getFactory(exchange.getContext().getPackageScanClassResolver());
077
078 // List of Pojos
079 List<Map<String, Object>> models = new ArrayList<Map<String, Object>>();
080
081 // Pojos of the model
082 Map<String, Object> model;
083
084 // Map to hold the model @OneToMany classes while binding
085 Map<String, List<Object>> lists = new HashMap<String, List<Object>>();
086
087 InputStreamReader in = new InputStreamReader(inputStream);
088
089 // Scanner is used to read big file
090 Scanner scanner = new Scanner(in);
091
092 // Retrieve the pair separator defined to split the record
093 ObjectHelper.notNull(factory.getPairSeparator(), "The pair separator property of the annotation @Message");
094 String separator = factory.getPairSeparator();
095
096 int count = 0;
097 try {
098 while (scanner.hasNextLine()) {
099 // Read the line
100 String line = scanner.nextLine().trim();
101
102 if (ObjectHelper.isEmpty(line)) {
103 // skip if line is empty
104 continue;
105 }
106
107 // Increment counter
108 count++;
109
110 // Create POJO
111 model = factory.factory();
112
113 // Split the message according to the pair separator defined in
114 // annotated class @Message
115 List<String> result = Arrays.asList(line.split(separator));
116
117 if (result.size() == 0 || result.isEmpty()) {
118 throw new java.lang.IllegalArgumentException("No records have been defined in the KVP");
119 }
120
121 if (result.size() > 0) {
122 // Bind data from message with model classes
123 // Counter is used to detect line where error occurs
124 factory.bind(result, model, count, lists);
125
126 // Link objects together
127 factory.link(model);
128
129 // Add objects graph to the list
130 models.add(model);
131
132 LOG.debug("Graph of objects created: {}", model);
133 }
134 }
135
136 // Test if models list is empty or not
137 // If this is the case (correspond to an empty stream, ...)
138 if (models.size() == 0) {
139 throw new java.lang.IllegalArgumentException("No records have been defined in the KVP");
140 } else {
141 return models;
142 }
143
144 } finally {
145 scanner.close();
146 IOHelper.close(in, "in", LOG);
147 }
148 }
149
150 protected BindyAbstractFactory createModelFactory(PackageScanClassResolver resolver) throws Exception {
151 return new BindyKeyValuePairFactory(resolver, getPackages());
152 }
153 }