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

   1 /*
   2  * Copyright (C) 2007-2012 Argeo GmbH
   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 package org.argeo.slc.detached;
  17
  18 import java.io.StringReader;
  19 import java.io.StringWriter;
  20 import java.util.Enumeration;
  21 import java.util.Properties;
  22
  23 import javax.xml.transform.Result;
  24 import javax.xml.transform.Source;
  25 import javax.xml.transform.Transformer;
  26 import javax.xml.transform.TransformerException;
  27 import javax.xml.transform.TransformerFactory;
  28 import javax.xml.transform.dom.DOMResult;
  29 import javax.xml.transform.dom.DOMSource;
  30 import javax.xml.transform.stream.StreamResult;
  31 import javax.xml.transform.stream.StreamSource;
  32
  33 import org.apache.commons.io.IOUtils;
  34 import org.apache.commons.logging.Log;
  35 import org.apache.commons.logging.LogFactory;
  36 import org.w3c.dom.Document;
  37 import org.w3c.dom.Element;
  38 import org.w3c.dom.NodeList;
  39
  40 /**
  41  * For compatibility with old JDKs (pre 1.5). Use Spring base one when possible.
  42  */
  43 public class DetachedXmlConverterCompat implements DetachedXmlConverter {
  44         public final static String SLC_DETACHED_NAMESPACE_URI = "http://argeo.org/projects/slc/schemas/detached";
  45         private final static Log log = LogFactory
  46                         .getLog(DetachedXmlConverterCompat.class);
  47
  48         private final Transformer copy;
  49
  50         public DetachedXmlConverterCompat() {
  51                 try {
  52                         copy = TransformerFactory.newInstance().newTransformer();
  53                 } catch (Exception e) {
  54                         throw new DetachedException("Could not create transformer.", e);
  55                 }
  56         }
  57
  58         public void marshallCommunication(DetachedCommunication detCom,
  59                         Result result) {
  60                 if (detCom instanceof DetachedRequest) {
  61                         marshallRequest((DetachedRequest) detCom, result);
  62                 } else if (detCom instanceof DetachedAnswer) {
  63                         marshallAnswer((DetachedAnswer) detCom, result);
  64                 } else {
  65                         throw new DetachedException("Unkown communication type "
  66                                         + detCom.getClass());
  67                 }
  68         }
  69
  70         public DetachedCommunication unmarshallCommunication(Source source) {
  71                 // Parse
  72                 DOMResult result = new DOMResult();
  73                 try {
  74                         copy.transform(source, result);
  75                 } catch (TransformerException e) {
  76                         throw new DetachedException("Could not copy xml source", e);
  77                 }
  78
  79                 if (log.isTraceEnabled()) {
  80                         try {
  81                                 DOMSource domSource = new DOMSource(result.getNode());
  82                                 StringWriter stringWriter = new StringWriter();
  83                                 StreamResult streamResult = new StreamResult(stringWriter);
  84                                 copy.transform(domSource, streamResult);
  85                                 log.trace("Unmarshall communication:\n"
  86                                                 + stringWriter.toString());
  87                                 IOUtils.closeQuietly(stringWriter);
  88                         } catch (TransformerException e) {
  89                                 log.warn("Could not log xml source", e);
  90                         }
  91                 }
  92                 Element root = (Element) ((Document) result.getNode())
  93                                 .getDocumentElement();
  94
  95                 // Create objects
  96                 String requestType = root.getLocalName();
  97                 if (requestType.equals("detached-request")) {
  98                         DetachedRequest request = new DetachedRequest();
  99                         request.setUuid(root.getElementsByTagNameNS(
 100                                         SLC_DETACHED_NAMESPACE_URI, "uuid").item(0)
 101                                         .getTextContent());
 102                         request
 103                                         .setRef(root.getElementsByTagNameNS(
 104                                                         SLC_DETACHED_NAMESPACE_URI, "ref").item(0)
 105                                                         .getTextContent());
 106                         Element propertiesElement = (Element) root.getElementsByTagNameNS(
 107                                         SLC_DETACHED_NAMESPACE_URI, "properties").item(0);
 108                         NodeList propElements = propertiesElement.getElementsByTagNameNS(
 109                                         SLC_DETACHED_NAMESPACE_URI, "prop");
 110                         Properties properties = new Properties();
 111                         for (int i = 0; i < propElements.getLength(); i++) {
 112                                 Element propElement = (Element) propElements.item(i);
 113                                 String key = propElement.getAttribute("key");
 114                                 String value = propElement.getTextContent();
 115                                 properties.setProperty(key, value);
 116                         }
 117                         request.setProperties(properties);
 118                         return request;
 119                 } else {
 120                         throw new DetachedException(requestType + " not implemented.");
 121                 }
 122         }
 123
 124         public void marshallAnswer(DetachedAnswer answer, Result result) {
 125                 StringBuffer buf = new StringBuffer("");
 126                 buf.append("<slc-det:detached-answer xmlns:slc-det=\""
 127                                 + SLC_DETACHED_NAMESPACE_URI + "\">");
 128                 if (answer.getUuid() != null)
 129                         buf.append("<slc-det:uuid>").append(answer.getUuid()).append(
 130                                         "</slc-det:uuid>");
 131                 buf.append("<slc-det:status>").append(answer.getStatus()).append(
 132                                 "</slc-det:status>");
 133                 if (answer.getLog() != null)
 134                         buf.append("<slc-det:log>").append(answer.getLog()).append(
 135                                         "</slc-det:log>");
 136                 if (answer.getProperties().size() != 0) {
 137                         buf.append("<slc-det:properties>");
 138                         Enumeration keys = answer.getProperties().keys();
 139                         while (keys.hasMoreElements()) {
 140                                 String key = (String) keys.nextElement();
 141                                 buf.append("<slc-det:prop key=\"").append(key).append("\">");
 142                                 buf.append(answer.getProperties().getProperty(key));
 143                                 buf.append("</slc-det:prop>");
 144                         }
 145                         buf.append("</slc-det:properties>");
 146                 }
 147                 buf.append("</slc-det:detached-answer>");
 148                 StringReader reader = new StringReader(buf.toString());
 149                 Source source = new StreamSource(reader);
 150                 try {
 151                         copy.transform(source, result);
 152                 } catch (TransformerException e) {
 153                         throw new DetachedException("Could not copy xml to result", e);
 154                 } finally {
 155                         IOUtils.closeQuietly(reader);
 156                 }
 157         }
 158
 159         public void marshallRequest(DetachedRequest request, Result result) {
 160                 throw new DetachedException(" Not implemented.");
 161         }
 162
 163         public DetachedRequest unmarshallRequest(Source source) {
 164                 DOMResult result = new DOMResult();
 165                 try {
 166                         copy.transform(source, result);
 167                 } catch (TransformerException e) {
 168                         throw new DetachedException("Could not copy xml source", e);
 169                 }
 170                 Element node = (Element) ((Document) result.getNode())
 171                                 .getDocumentElement();
 172                 DetachedRequest request = new DetachedRequest();
 173                 request.setUuid(node.getElementsByTagNameNS(SLC_DETACHED_NAMESPACE_URI,
 174                                 "uuid").item(0).getTextContent());
 175                 request.setRef(node.getElementsByTagNameNS(SLC_DETACHED_NAMESPACE_URI,
 176                                 "ref").item(0).getTextContent());
 177                 Element propertiesElement = (Element) node.getElementsByTagNameNS(
 178                                 SLC_DETACHED_NAMESPACE_URI, "properties").item(0);
 179                 NodeList propElements = propertiesElement.getElementsByTagNameNS(
 180                                 SLC_DETACHED_NAMESPACE_URI, "prop");
 181                 Properties properties = new Properties();
 182                 for (int i = 0; i < propElements.getLength(); i++) {
 183                         Element propElement = (Element) propElements.item(i);
 184                         String key = propElement.getAttribute("key");
 185                         String value = propElement.getTextContent();
 186                         properties.setProperty(key, value);
 187                 }
 188                 request.setProperties(properties);
 189                 return request;
 190         }
 191 }