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.List;
025 import java.util.Map;
026 import java.util.Scanner;
027
028 import org.apache.camel.Exchange;
029 import org.apache.camel.dataformat.bindy.BindyKeyValuePairFactory;
030 import org.apache.camel.dataformat.bindy.util.Converter;
031 import org.apache.camel.spi.DataFormat;
032 import org.apache.camel.spi.PackageScanClassResolver;
033 import org.apache.camel.util.IOHelper;
034 import org.apache.camel.util.ObjectHelper;
035 import org.apache.commons.logging.Log;
036 import org.apache.commons.logging.LogFactory;
037
038 /**
039 * A <a href="http://camel.apache.org/data-format.html">data format</a> (
040 * {@link DataFormat}) using Bindy to marshal to and from CSV files
041 */
042 public class BindyKeyValuePairDataFormat implements DataFormat {
043
044 private static final transient Log LOG = LogFactory.getLog(BindyKeyValuePairDataFormat.class);
045
046 private String[] packages;
047 private BindyKeyValuePairFactory modelFactory;
048
049 public BindyKeyValuePairDataFormat() {
050 }
051
052 public BindyKeyValuePairDataFormat(String... packages) {
053 this.packages = packages;
054 }
055
056 @SuppressWarnings("unchecked")
057 public void marshal(Exchange exchange, Object body, OutputStream outputStream) throws Exception {
058 BindyKeyValuePairFactory 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 = 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 InputStreamReader in = new InputStreamReader(inputStream);
085
086 // Scanner is used to read big file
087 Scanner scanner = new Scanner(in);
088
089 // Retrieve the pair separator defined to split the record
090 ObjectHelper.notNull(factory.getPairSeparator(), "The pair separator property of the annotation @Message");
091 String separator = factory.getPairSeparator();
092
093 int count = 0;
094 try {
095
096 while (scanner.hasNextLine()) {
097
098 // Read the line
099 String line = scanner.nextLine().trim();
100
101 if (ObjectHelper.isEmpty(line)) {
102 // skip if line is empty
103 continue;
104 }
105
106 // Increment counter
107 count++;
108
109 // Create POJO
110 model = factory.factory();
111
112 // Split the message according to the pair separator defined in
113 // annotated class @Message
114 List<String> result = Arrays.asList(line.split(separator));
115
116 if (result.size() == 0 || result.isEmpty()) {
117 throw new java.lang.IllegalArgumentException("No records have been defined in the KVP !");
118 }
119
120 if (result.size() > 0) {
121
122 // Bind data from message with model classes
123 // Counter is used to detect line where error occurs
124 factory.bind(result, model, count);
125
126 // Link objects together
127 factory.link(model);
128
129 // Add objects graph to the list
130 models.add(model);
131
132 if (LOG.isDebugEnabled()) {
133 LOG.debug("Graph of objects created : " + model);
134 }
135 }
136
137 }
138
139 // Test if models list is empty or not
140 // If this is the case (correspond to an empty stream, ...)
141 if (models.size() == 0) {
142 throw new java.lang.IllegalArgumentException("No records have been defined in the KVP !");
143 } else {
144 return models;
145 }
146
147 } finally {
148 scanner.close();
149 IOHelper.close(in, "in", LOG);
150 }
151 }
152
153 /**
154 * Method used to create the singleton of the BindyKeyValuePairFactory
155 */
156 public BindyKeyValuePairFactory getFactory(PackageScanClassResolver resolver) throws Exception {
157 if (modelFactory == null) {
158 modelFactory = new BindyKeyValuePairFactory(resolver, this.packages);
159 }
160 return modelFactory;
161 }
162
163 public void setModelFactory(BindyKeyValuePairFactory modelFactory) {
164 this.modelFactory = modelFactory;
165 }
166
167 public String[] getPackages() {
168 return packages;
169 }
170
171 public void setPackages(String... packages) {
172 this.packages = packages;
173 }
174
175 }