Examples of org.eclipse.emf.ecore.xmi.XMLParserPool

org.eclipse.emf.ecore.xmi.XMLParserPool
Defines an interface to cache parsers and parser's handlers (XMLDefaultHandler) to improve deserialization performance. The use of a parser pool can be specified using {@link XMLResource#OPTION_USE_PARSER_POOL} load option.
The parser instance is retrieved and placed back to the pool based on the features and properties specified for this parser. The default implementation is provided by {@link org.eclipse.emf.ecore.xmi.impl.XMLParserPoolImpl XMLParserPoolImpl}.

Note that the correct properties and feature maps for this parser instance must be provided when retrieving the parser from the pool and, even more importantly when, releasing the parser back to the pool. Failure to do so will result in improperly configured parsers.

The handler instance is retrieved and placed back to the pool based on the options map specified for loading a resource. The default implementation is provided by {@link org.eclipse.emf.ecore.xmi.impl.XMLParserPoolImpl XMLParserPoolImpl}.

    }
    
    this.resource = resource;
    is = inputStream;
    this.options = options;
    XMLParserPool pool = (XMLParserPool)options.get(XMLResource.OPTION_USE_PARSER_POOL);
    @SuppressWarnings("unchecked") Map<String, Boolean> parserFeatures = (Map<String, Boolean>)options.get(XMLResource.OPTION_PARSER_FEATURES);
    @SuppressWarnings("unchecked") Map<String, ?> parserProperties = (Map<String, ?>)options.get(XMLResource.OPTION_PARSER_PROPERTIES);
    parserFeatures = (parserFeatures == null) ? Collections.<String, Boolean>emptyMap() : parserFeatures;
    parserProperties = (parserProperties == null) ? Collections.<String, Object>emptyMap() : parserProperties;


    // HACK: reading encoding
    String encoding = null;
    if (!Boolean.FALSE.equals(options.get(XMLResource.OPTION_USE_DEPRECATED_METHODS)))
    {
      encoding = getEncoding();
      resource.setEncoding(encoding);
    }
    try
    {
      SAXParser parser;  
      DefaultHandler handler;


      if (pool != null)
      {
        // use the pool to retrieve the parser
        parser = pool.get(parserFeatures, parserProperties, Boolean.TRUE.equals(options.get(XMLResource.OPTION_USE_LEXICAL_HANDLER)));
        handler = (DefaultHandler)pool.getDefaultHandler(resource, this, helper, options);
      } 
      else 
      {
        parser = makeParser();
        handler = makeDefaultHandler();
        // set features and properties
        if (parserFeatures != null)
        {
          for (Map.Entry<String, Boolean> entry : parserFeatures.entrySet())
          {
            parser.getXMLReader().setFeature(entry.getKey(), entry.getValue());
          }
        }
        if (parserProperties !=null)
        {
          for (Map.Entry<String, ?> entry : parserProperties.entrySet())
          {
            parser.getXMLReader().setProperty(entry.getKey(), entry.getValue());
          }
        }
      }


      InputSource inputSource = new InputSource(is);
      if (resource.getURI() != null)
      {
        String resourceURI = resource.getURI().toString();
        inputSource.setPublicId(resourceURI);
        inputSource.setSystemId(resourceURI);
        inputSource.setEncoding(encoding);
      }
    
      // set lexical handler
      if (Boolean.TRUE.equals(options.get(XMLResource.OPTION_USE_LEXICAL_HANDLER)))
      {
        if (parserProperties == null || parserProperties.get(SAX_LEXICAL_PROPERTY) == null) 
        {
          parser.setProperty(SAX_LEXICAL_PROPERTY, handler);
        }
      }
      
      parser.parse(inputSource, handler);
      
      // release parser back to the pool
      if (pool != null)
      {
        pool.release(parser, parserFeatures, parserProperties, Boolean.TRUE.equals(options.get(XMLResource.OPTION_USE_LEXICAL_HANDLER)));
        pool.releaseDefaultHandler((XMLDefaultHandler)handler, options);
      }
      
      helper = null;
      handleErrors();
    }

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  public void load(XMLResource resource, InputSource inputSource, Map<?, ?> options) throws IOException
  {
    this.resource = resource;
   
    this.options = options;
    XMLParserPool pool = (XMLParserPool)options.get(XMLResource.OPTION_USE_PARSER_POOL);
    @SuppressWarnings("unchecked") Map<String, Boolean> parserFeatures = (Map<String, Boolean>)options.get(XMLResource.OPTION_PARSER_FEATURES);
    @SuppressWarnings("unchecked") Map<String, ?> parserProperties = (Map<String, ?>)options.get(XMLResource.OPTION_PARSER_PROPERTIES);
    parserFeatures = (parserFeatures == null) ? Collections.<String, Boolean>emptyMap() : parserFeatures;
    parserProperties = (parserProperties == null) ? Collections.<String, Object>emptyMap() : parserProperties;


    // Don't read encoding - rely on XML parser to provide one via Locator2


    try
    {
      SAXParser parser;  
      DefaultHandler handler;


      if (pool != null)
      {
        // use the pool to retrieve the parser
        parser = pool.get(parserFeatures, parserProperties, Boolean.TRUE.equals(options.get(XMLResource.OPTION_USE_LEXICAL_HANDLER)));
        handler = (DefaultHandler)pool.getDefaultHandler(resource, this, helper, options);
      } 
      else 
      {
        parser = makeParser();
        handler = makeDefaultHandler();
        // set features and properties
        if (parserFeatures != null)
        {
          for (Map.Entry<String, Boolean> feature : parserFeatures.entrySet())
          {
            parser.getXMLReader().setFeature(feature.getKey(),  feature.getValue());
          }
        }
        if (parserProperties !=null)
        {
          for (Map.Entry<String, ?> property : parserProperties.entrySet())
          {
            parser.getXMLReader().setProperty(property.getKey(), property.getValue());
          }
        }
      }
  
      // set lexical handler
      if (Boolean.TRUE.equals(options.get(XMLResource.OPTION_USE_LEXICAL_HANDLER)))
      {
        if (parserProperties == null || parserProperties.get(SAX_LEXICAL_PROPERTY) == null) 
        {
          parser.setProperty(SAX_LEXICAL_PROPERTY, handler);
        }
      }
      
      parser.parse(inputSource, handler);


      // release parser back to the pool
      if (pool != null)
      {
        pool.release(parser, parserFeatures, parserProperties, Boolean.TRUE.equals(options.get(XMLResource.OPTION_USE_LEXICAL_HANDLER)));
        pool.releaseDefaultHandler((XMLDefaultHandler)handler, options);
      }


      helper = null;
      handleErrors();
    }

View Full Code Here

  {
    this.resource = resource;
    this.options = options;
    this.namespaceAware = Boolean.FALSE.equals(options.get(XMLResource.OPTION_USE_DEPRECATED_METHODS));
    DefaultHandler handler;
    XMLParserPool pool = (XMLParserPool)options.get(XMLResource.OPTION_USE_PARSER_POOL);
    if (pool != null)
    {
      handler = (DefaultHandler)pool.getDefaultHandler(resource, this, helper, options);
    }
    else
    {
      handler = makeDefaultHandler();
    }
    LexicalHandler lexicalHandler = null;


    if (Boolean.TRUE.equals(options.get(XMLResource.OPTION_USE_LEXICAL_HANDLER)))
    {
      lexicalHandler = (LexicalHandler)handler;
    }


    AttributesProxy attributesProxy = new AttributesProxy();
    try
    {
      short type = node.getNodeType();
      if (type == Node.ELEMENT_NODE)
      {
        handler.startDocument();
        if (Boolean.TRUE.equals(options.get(XMLResource.OPTION_DOM_USE_NAMESPACES_IN_SCOPE)))
        {
          traverseElement((Element)node, attributesProxy, handler, lexicalHandler);
        }
        else
        {
          traverse(node, attributesProxy, handler, lexicalHandler);
        }
        handler.endDocument();      
      }
      else
      {
        traverse(node, attributesProxy, handler, lexicalHandler);
      }
    }
    catch (SAXException e)
    {
      // ignore
    }
    
    if (pool != null)
    {
      pool.releaseDefaultHandler((XMLDefaultHandler)handler, options);
    }
    
    attributesProxy = null;
    handler = null;
    lexicalHandler = null;

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org.eclipse.emf.ecore.xmi.impl.XMLLoadImpl

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