Initial commit

git-svn-id: https://joinup.ec.europa.eu/svn/moa-idspss/trunk@806 d688527b-c9ab-4aba-bd8d-4036d912da1d

1 files changed, 187 insertions, 0 deletions

diff --git a/erecht.client.ss/src/at/gv/egovernment/moa/ss/erechtclient/init/ContextListener.java b/erecht.client.ss/src/at/gv/egovernment/moa/ss/erechtclient/init/ContextListener.java
new file mode 100644
index 000000000..6cc5988ac
--- /dev/null
+++ b/erecht.client.ss/src/at/gv/egovernment/moa/ss/erechtclient/init/ContextListener.java
@@ -0,0 +1,187 @@
+/*
+ * (c) Siemens Business Services GmbH
+ */
+package at.gv.egovernment.moa.ss.erechtclient.init;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Properties;
+
+import javax.servlet.ServletContext;
+import javax.servlet.ServletContextEvent;
+import javax.servlet.ServletContextListener;
+
+import org.apache.log4j.Logger;
+import org.apache.xerces.parsers.DOMParser;
+import org.apache.xerces.parsers.XMLGrammarPreparser;
+import org.apache.xerces.util.SymbolTable;
+import org.apache.xerces.util.XMLGrammarPoolImpl;
+import org.apache.xerces.xni.grammars.XMLGrammarDescription;
+import org.apache.xerces.xni.grammars.XMLGrammarPool;
+import org.apache.xerces.xni.parser.XMLInputSource;
+import org.xml.sax.SAXException;
+
+/**
+ * @author Gregor Karlinger (mailto:gregor.karlinger@siemens.com)
+ */
+public class ContextListener implements ServletContextListener
+{
+  private static final String SAX_NAMESPACES_FEATURE = "http://xml.org/sax/features/namespaces";
+  private static final String SAX_VALIDATION_FEATURE = "http://xml.org/sax/features/validation";
+
+  private static final String XERCES_SCHEMA_VALIDATION_FEATURE = 
+    "http://apache.org/xml/features/validation/schema";
+  private static final String XERCES_NORMALIZED_VALUE_FEATURE =  
+    "http://apache.org/xml/features/validation/schema/normalized-value";
+  private static final String XERCES_INCLUDE_IGNORABLE_WHITESPACE_FEATURE =
+    "http://apache.org/xml/features/dom/include-ignorable-whitespace";
+  private static final String XERCES_CREATE_ENTITY_REF_NODES_FEATURE =
+    "http://apache.org/xml/features/dom/create-entity-ref-nodes";
+  protected static final String XERCES_DEFER_NODE_EXPANSION_ =
+    "http://apache.org/xml/features/dom/defer-node-expansion";
+  protected static final String XERCES_AUGMENT_PSI_ =
+	"http://apache.org/xml/features/validation/schema/augment-psvi";
+	  
+  private static final int BIG_PRIME = 2039;
+
+  private static Logger logger_ = Logger.getLogger(Constants.LH_INIT_);
+
+  /* ---------------------------------------------------------------------------------------------------- */
+
+  /**
+   * Initializes the web application.
+   * 
+   * @see javax.servlet.ServletContextListener#contextInitialized(javax.servlet.ServletContextEvent)
+   */
+  public void contextInitialized(ServletContextEvent event)
+  {
+    logger_.debug("Context is being initialized.");
+    
+    ServletContext context = event.getServletContext();
+    
+    String initPropsLoc = System.getProperty(Constants.INIT_PROPS_LOC_);
+    if (initPropsLoc == null)
+    {
+      logger_.fatal("System property \"" + Constants.INIT_PROPS_LOC_ + "\" not set.");
+      logger_.fatal("Web application initialization failed.");
+      return;
+    }
+    
+    // Load init properties
+    try
+    {
+      logger_.debug("Init properties location \"" + initPropsLoc + "\" will be used.");
+      
+      // Try to interpret init properties location as relative to the web application root
+      InputStream initPropsIS = context.getResourceAsStream(initPropsLoc);
+      
+      if (initPropsIS == null)
+      {
+        // If this does not work, try to interpret init properties location as an absolute file system path
+        initPropsIS = new FileInputStream(initPropsLoc);
+      }
+      
+      Properties initProps = new Properties();
+      initProps.load(initPropsIS);
+      context.setAttribute(Constants.WSCP_INIT_PROPS_, initProps);
+
+      // Prepare application bean knowing about init properties
+      InitPropertiesBean initPropsBean = new InitPropertiesBean(initProps);
+      context.setAttribute(Constants.WSCP_INITPROPS_BEAN_, initPropsBean);
+    }
+    catch (IOException e)
+    {
+      logger_.fatal("Cannot load initialization properties from location \"" + initPropsLoc + "\".", e);
+      logger_.fatal("Web application initialization failed.");
+      return;
+    }
+    
+    // Initialize XML parser
+    SymbolTable symbolTable = new SymbolTable(BIG_PRIME);
+    XMLGrammarPool grammarPool = new XMLGrammarPoolImpl();
+
+    XMLGrammarPreparser preparser = new XMLGrammarPreparser(symbolTable);
+    preparser.registerPreparser(XMLGrammarDescription.XML_SCHEMA, null);
+    preparser.setProperty(org.apache.xerces.impl.Constants.XERCES_PROPERTY_PREFIX
+      + org.apache.xerces.impl.Constants.XMLGRAMMAR_POOL_PROPERTY, grammarPool);
+    preparser.setFeature(SAX_NAMESPACES_FEATURE, true);
+    preparser.setFeature(SAX_VALIDATION_FEATURE, true);
+
+    // Schema for MOA 1.3
+    // TODO Maybe remove this?
+    Properties initProps = (Properties) context.getAttribute(Constants.WSCP_INIT_PROPS_);
+    String moaSchemaLoc = initProps.getProperty(Constants.IP_MOA_SCHEMA_);
+    if (!preparseSchema(context, preparser, moaSchemaLoc)) 
+    {
+      logger_.fatal("Web application initialization failed.");
+      return;
+    }
+    
+    // TODO parser is not threadsafe
+    DOMParser xmlParser = new DOMParser(symbolTable, grammarPool);
+    try
+    {
+      xmlParser.setFeature(SAX_NAMESPACES_FEATURE, true);
+      xmlParser.setFeature(SAX_VALIDATION_FEATURE, true);
+      xmlParser.setFeature(XERCES_SCHEMA_VALIDATION_FEATURE, true);
+      xmlParser.setFeature(XERCES_NORMALIZED_VALUE_FEATURE, false);
+      xmlParser.setFeature(XERCES_INCLUDE_IGNORABLE_WHITESPACE_FEATURE, true);
+      xmlParser.setFeature(XERCES_CREATE_ENTITY_REF_NODES_FEATURE, false);
+      xmlParser.setFeature(XERCES_DEFER_NODE_EXPANSION_, true);
+      xmlParser.setFeature(XERCES_AUGMENT_PSI_, false); 
+      xmlParser.setErrorHandler(new XMLParserErrorHandler(false, true, true));
+    }
+    catch (SAXException e)
+    {
+      String message = "Initialization of XML parser failed.";
+      logger_.fatal(message, e);
+      logger_.fatal("Web application initialization failed.");
+      return;
+    }
+    context.setAttribute(Constants.WSCP_XMLPARSER_, xmlParser);
+    
+    String message = "Web application initialization succeeded.";
+    logger_.info(message);
+  }
+
+  /* ---------------------------------------------------------------------------------------------------- */
+
+  /**
+   * Does some clean up at finalization of the web application.
+   * 
+   * @see javax.servlet.ServletContextListener#contextDestroyed(javax.servlet.ServletContextEvent)
+   */
+  public void contextDestroyed(ServletContextEvent event)
+  {
+    // Remove init properties from web service context
+    Properties initProps = (Properties) event.getServletContext().getAttribute(Constants.WSCP_INIT_PROPS_);
+    if (initProps != null) event.getServletContext().removeAttribute(Constants.WSCP_INIT_PROPS_);
+  }
+
+  /* ---------------------------------------------------------------------------------------------------- */
+
+  private boolean preparseSchema(ServletContext context, XMLGrammarPreparser preparser, String schemaLoc) 
+  {
+    InputStream schemaIS = context.getResourceAsStream(schemaLoc);
+    if (schemaIS == null)
+    {
+      String message = "Cannot load schema from location \"" + schemaLoc + "\".";
+      logger_.fatal(message);
+      return false;
+    }
+    try
+    {
+      String schemaSystemId = context.getResource(schemaLoc).toExternalForm();
+      preparser.preparseGrammar(XMLGrammarDescription.XML_SCHEMA,
+        new XMLInputSource(null, schemaSystemId, null, schemaIS, null));
+    }
+    catch (Exception e)
+    {
+      String message = "Parsing schema loaded from location \"" + schemaLoc + "\" failed.";
+      logger_.fatal(message, e);
+      return false;
+    }
+    return true;
+  }
+}