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.ObjectHelper;
034 import org.apache.commons.logging.Log;
035 import org.apache.commons.logging.LogFactory;
036
037 /**
038 * A <a href="http://camel.apache.org/data-format.html">data format</a> (
039 * {@link DataFormat}) using Bindy to marshal to and from CSV files
040 */
041 public class BindyKeyValuePairDataFormat implements DataFormat {
042
043 private static final transient Log LOG = LogFactory.getLog(BindyKeyValuePairDataFormat.class);
044
045 private String[] packages;
046 private BindyKeyValuePairFactory modelFactory;
047
048 public BindyKeyValuePairDataFormat() {
049 }
050
051 public BindyKeyValuePairDataFormat(String... packages) {
052 this.packages = packages;
053 }
054
055 @SuppressWarnings("unchecked")
056 public void marshal(Exchange exchange, Object body, OutputStream outputStream) throws Exception {
057 BindyKeyValuePairFactory factory = getFactory(exchange.getContext().getPackageScanClassResolver());
058 List<Map<String, Object>> models = (ArrayList<Map<String, Object>>)body;
059 byte[] crlf;
060
061 // Get CRLF
062 crlf = Converter.getByteReturn(factory.getCarriageReturn());
063
064 for (Map<String, Object> model : models) {
065 String result = factory.unbind(model);
066 byte[] bytes = exchange.getContext().getTypeConverter().convertTo(byte[].class, exchange, result);
067 outputStream.write(bytes);
068
069 // Add a carriage return
070 outputStream.write(crlf);
071 }
072 }
073
074 public Object unmarshal(Exchange exchange, InputStream inputStream) throws Exception {
075 BindyKeyValuePairFactory factory = getFactory(exchange.getContext().getPackageScanClassResolver());
076
077 // List of Pojos
078 List<Map<String, Object>> models = new ArrayList<Map<String, Object>>();
079
080 // Pojos of the model
081 Map<String, Object> model;
082
083 InputStreamReader in = new InputStreamReader(inputStream);
084
085 // Scanner is used to read big file
086 Scanner scanner = new Scanner(in);
087
088 // Retrieve the pair separator defined to split the record
089 ObjectHelper.notNull(factory.getPairSeparator(), "The pair separator property of the annotation @Message");
090 String separator = factory.getPairSeparator();
091
092 int count = 0;
093 try {
094
095 while (scanner.hasNextLine()) {
096
097 // Read the line
098 String line = scanner.nextLine().trim();
099
100 if (ObjectHelper.isEmpty(line)) {
101 // skip if line is empty
102 continue;
103 }
104
105 // Increment counter
106 count++;
107
108 // Create POJO
109 model = factory.factory();
110
111 // Split the message according to the pair separator defined in
112 // annotated class @Message
113 List<String> result = Arrays.asList(line.split(separator));
114
115 if (result.size() == 0 || result.isEmpty()) {
116 throw new java.lang.IllegalArgumentException("No records have been defined in the KVP !");
117 }
118
119 if (result.size() > 0) {
120
121 // Bind data from message with model classes
122 // Counter is used to detect line where error occurs
123 factory.bind(result, model, count);
124
125 // Link objects together
126 factory.link(model);
127
128 // Add objects graph to the list
129 models.add(model);
130
131 if (LOG.isDebugEnabled()) {
132 LOG.debug("Graph of objects created : " + model);
133 }
134 }
135
136 }
137
138 // Test if models list is empty or not
139 // If this is the case (correspond to an empty stream, ...)
140 if (models.size() == 0) {
141 throw new java.lang.IllegalArgumentException("No records have been defined in the KVP !");
142 } else {
143 return models;
144 }
145
146 } finally {
147 scanner.close();
148 ObjectHelper.close(in, "in", LOG);
149 }
150 }
151
152 /**
153 * Method used to create the singleton of the BindyKeyValuePairFactory
154 */
155 public BindyKeyValuePairFactory getFactory(PackageScanClassResolver resolver) throws Exception {
156 if (modelFactory == null) {
157 modelFactory = new BindyKeyValuePairFactory(resolver, this.packages);
158 }
159 return modelFactory;
160 }
161
162 public void setModelFactory(BindyKeyValuePairFactory modelFactory) {
163 this.modelFactory = modelFactory;
164 }
165
166 public String[] getPackages() {
167 return packages;
168 }
169
170 public void setPackages(String... packages) {
171 this.packages = packages;
172 }
173
174 }