java/src/main/com/google/apphosting/utils/config/XmlUtils.java

   1 package com.google.apphosting.utils.config;
   2
   3 import org.mortbay.xml.XmlParser;
   4 import org.mortbay.xml.XmlParser.Node;
   5 import org.xml.sax.SAXException;
   6
   7 import java.io.IOException;
   8 import java.io.InputStream;
   9 import java.util.logging.Level;
  10 import java.util.logging.Logger;
  11
  12 /**
  13  * Utility functions for processing XML.
  14  */
  15 public class XmlUtils {
  16   private static final Logger logger = Logger.getLogger(XmlUtils.class.getName());
  17
  18   static String getText(XmlParser.Node node) throws AppEngineConfigException{
  19     Object child = node.get(0);
  20     String value;
  21     if (child == null) {
  22       value = "";
  23     } else {
  24       if (!(child instanceof String)) {
  25         String msg = "Invalid XML: String content expected in node '" + node.getTag() + "'.";
  26         logger.log(Level.SEVERE, msg);
  27         throw new AppEngineConfigException(msg);
  28       }
  29       value = (String) child;
  30     }
  31
  32     return value.trim();
  33   }
  34
  35   /**
  36    * Parses the input stream and returns the {@link Node} for the root element.
  37    *
  38    * @throws AppEngineConfigException If the input stream cannot be parsed.
  39    */
  40   static Node parse(InputStream is) {
  41     XmlParser xmlParser = new XmlParser();
  42     try {
  43       return xmlParser.parse(is);
  44     } catch (IOException e) {
  45       String msg = "Received IOException parsing the input stream.";
  46       logger.log(Level.SEVERE, msg, e);
  47       throw new AppEngineConfigException(msg, e);
  48     } catch (SAXException e) {
  49       String msg = "Received SAXException parsing the input stream.";
  50       logger.log(Level.SEVERE, msg, e);
  51       throw new AppEngineConfigException(msg, e);
  52     }
  53   }
  54 }