runtime/org.argeo.slc.detached/src/main/java/org/argeo/slc/detached/DetachedXmlConverterCompat.java

   1 /*
   2  * Copyright (C) 2010 Mathieu Baudier <mbaudier@argeo.org>
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package org.argeo.slc.detached;
  18
  19 import java.io.StringReader;
  20 import java.io.StringWriter;
  21 import java.util.Enumeration;
  22 import java.util.Properties;
  23
  24 import javax.xml.transform.Result;
  25 import javax.xml.transform.Source;
  26 import javax.xml.transform.Transformer;
  27 import javax.xml.transform.TransformerException;
  28 import javax.xml.transform.TransformerFactory;
  29 import javax.xml.transform.dom.DOMResult;
  30 import javax.xml.transform.dom.DOMSource;
  31 import javax.xml.transform.stream.StreamResult;
  32 import javax.xml.transform.stream.StreamSource;
  33
  34 import org.apache.commons.io.IOUtils;
  35 import org.apache.commons.logging.Log;
  36 import org.apache.commons.logging.LogFactory;
  37 import org.w3c.dom.Document;
  38 import org.w3c.dom.Element;
  39 import org.w3c.dom.NodeList;
  40
  41 /**
  42  * For compatibility with old JDKs (pre 1.5). Use Spring base one when possible.
  43  */
  44 public class DetachedXmlConverterCompat implements DetachedXmlConverter {
  45         public final static String SLC_DETACHED_NAMESPACE_URI = "http://argeo.org/projects/slc/schemas/detached";
  46         private final static Log log = LogFactory
  47                         .getLog(DetachedXmlConverterCompat.class);
  48
  49         private final Transformer copy;
  50
  51         public DetachedXmlConverterCompat() {
  52                 try {
  53                         copy = TransformerFactory.newInstance().newTransformer();
  54                 } catch (Exception e) {
  55                         throw new DetachedException("Could not create transformer.", e);
  56                 }
  57         }
  58
  59         public void marshallCommunication(DetachedCommunication detCom,
  60                         Result result) {
  61                 if (detCom instanceof DetachedRequest) {
  62                         marshallRequest((DetachedRequest) detCom, result);
  63                 } else if (detCom instanceof DetachedAnswer) {
  64                         marshallAnswer((DetachedAnswer) detCom, result);
  65                 } else {
  66                         throw new DetachedException("Unkown communication type "
  67                                         + detCom.getClass());
  68                 }
  69         }
  70
  71         public DetachedCommunication unmarshallCommunication(Source source) {
  72                 // Parse
  73                 DOMResult result = new DOMResult();
  74                 try {
  75                         copy.transform(source, result);
  76                 } catch (TransformerException e) {
  77                         throw new DetachedException("Could not copy xml source", e);
  78                 }
  79
  80                 if (log.isTraceEnabled()) {
  81                         try {
  82                                 DOMSource domSource = new DOMSource(result.getNode());
  83                                 StringWriter stringWriter = new StringWriter();
  84                                 StreamResult streamResult = new StreamResult(stringWriter);
  85                                 copy.transform(domSource, streamResult);
  86                                 log.trace("Unmarshall communication:\n"
  87                                                 + stringWriter.toString());
  88                                 IOUtils.closeQuietly(stringWriter);
  89                         } catch (TransformerException e) {
  90                                 log.warn("Could not log xml source", e);
  91                         }
  92                 }
  93                 Element root = (Element) ((Document) result.getNode())
  94                                 .getDocumentElement();
  95
  96                 // Create objects
  97                 String requestType = root.getLocalName();
  98                 if (requestType.equals("detached-request")) {
  99                         DetachedRequest request = new DetachedRequest();
 100                         request.setUuid(root.getElementsByTagNameNS(
 101                                         SLC_DETACHED_NAMESPACE_URI, "uuid").item(0)
 102                                         .getTextContent());
 103                         request
 104                                         .setRef(root.getElementsByTagNameNS(
 105                                                         SLC_DETACHED_NAMESPACE_URI, "ref").item(0)
 106                                                         .getTextContent());
 107                         request.setPath(root.getElementsByTagNameNS(
 108                                         SLC_DETACHED_NAMESPACE_URI, "path").item(0)
 109                                         .getTextContent());
 110                         Element propertiesElement = (Element) root.getElementsByTagNameNS(
 111                                         SLC_DETACHED_NAMESPACE_URI, "properties").item(0);
 112                         NodeList propElements = propertiesElement.getElementsByTagNameNS(
 113                                         SLC_DETACHED_NAMESPACE_URI, "prop");
 114                         Properties properties = new Properties();
 115                         for (int i = 0; i < propElements.getLength(); i++) {
 116                                 Element propElement = (Element) propElements.item(i);
 117                                 String key = propElement.getAttribute("key");
 118                                 String value = propElement.getTextContent();
 119                                 properties.setProperty(key, value);
 120                         }
 121                         request.setProperties(properties);
 122                         return request;
 123                 } else {
 124                         throw new DetachedException(requestType + " not implemented.");
 125                 }
 126         }
 127
 128         public void marshallAnswer(DetachedAnswer answer, Result result) {
 129                 StringBuffer buf = new StringBuffer("");
 130                 buf.append("<slc-det:detached-answer xmlns:slc-det=\""
 131                                 + SLC_DETACHED_NAMESPACE_URI + "\">");
 132                 if (answer.getUuid() != null)
 133                         buf.append("<slc-det:uuid>").append(answer.getUuid()).append(
 134                                         "</slc-det:uuid>");
 135                 buf.append("<slc-det:status>").append(answer.getStatus()).append(
 136                                 "</slc-det:status>");
 137                 if (answer.getLog() != null)
 138                         buf.append("<slc-det:log>").append(answer.getLog()).append(
 139                                         "</slc-det:log>");
 140                 if (answer.getProperties().size() != 0) {
 141                         buf.append("<slc-det:properties>");
 142                         Enumeration keys = answer.getProperties().keys();
 143                         while (keys.hasMoreElements()) {
 144                                 String key = (String) keys.nextElement();
 145                                 buf.append("<slc-det:prop key=\"").append(key).append("\">");
 146                                 buf.append(answer.getProperties().getProperty(key));
 147                                 buf.append("</slc-det:prop>");
 148                         }
 149                         buf.append("</slc-det:properties>");
 150                 }
 151                 buf.append("</slc-det:detached-answer>");
 152                 StringReader reader = new StringReader(buf.toString());
 153                 Source source = new StreamSource(reader);
 154                 try {
 155                         copy.transform(source, result);
 156                 } catch (TransformerException e) {
 157                         throw new DetachedException("Could not copy xml to result", e);
 158                 } finally {
 159                         IOUtils.closeQuietly(reader);
 160                 }
 161         }
 162
 163         public void marshallRequest(DetachedRequest request, Result result) {
 164                 throw new DetachedException(" Not implemented.");
 165         }
 166
 167         public DetachedRequest unmarshallRequest(Source source) {
 168                 DOMResult result = new DOMResult();
 169                 try {
 170                         copy.transform(source, result);
 171                 } catch (TransformerException e) {
 172                         throw new DetachedException("Could not copy xml source", e);
 173                 }
 174                 Element node = (Element) ((Document) result.getNode())
 175                                 .getDocumentElement();
 176                 DetachedRequest request = new DetachedRequest();
 177                 request.setUuid(node.getElementsByTagNameNS(SLC_DETACHED_NAMESPACE_URI,
 178                                 "uuid").item(0).getTextContent());
 179                 request.setRef(node.getElementsByTagNameNS(SLC_DETACHED_NAMESPACE_URI,
 180                                 "ref").item(0).getTextContent());
 181                 request.setPath(node.getElementsByTagNameNS(SLC_DETACHED_NAMESPACE_URI,
 182                                 "path").item(0).getTextContent());
 183                 Element propertiesElement = (Element) node.getElementsByTagNameNS(
 184                                 SLC_DETACHED_NAMESPACE_URI, "properties").item(0);
 185                 NodeList propElements = propertiesElement.getElementsByTagNameNS(
 186                                 SLC_DETACHED_NAMESPACE_URI, "prop");
 187                 Properties properties = new Properties();
 188                 for (int i = 0; i < propElements.getLength(); i++) {
 189                         Element propElement = (Element) propElements.item(i);
 190                         String key = propElement.getAttribute("key");
 191                         String value = propElement.getTextContent();
 192                         properties.setProperty(key, value);
 193                 }
 194                 request.setProperties(properties);
 195                 return request;
 196         }
 197 }