Examples of org.xml.sax.EntityResolver

org.xml.sax.EntityResolver
axproject.org'>http://www.saxproject.org for further information.
If a SAX application needs to implement customized handling for external entities, it must implement this interface and register an instance with the SAX driver using the {@link org.xml.sax.XMLReader#setEntityResolver setEntityResolver}method.

The XML reader will then allow the application to intercept any external entities (including the external DTD subset and external parameter entities, if any) before including them.

Many SAX applications will not need to implement this interface, but it will be especially useful for applications that build XML documents from databases or other specialised input sources, or for applications that use URI types other than URLs.

The following resolver would provide the application with a special character stream for the entity with the system identifier "http://www.myhost.com/today":
```
 import org.xml.sax.EntityResolver; import org.xml.sax.InputSource; public class MyResolver implements EntityResolver { public InputSource resolveEntity (String publicId, String systemId) { if (systemId.equals("http://www.myhost.com/today")) { // return a special input source MyReader reader = new MyReader(); return new InputSource(reader); } else { // use the default behaviour return null; } } } 
```
The application can also use this interface to redirect system identifiers to local URIs or to look up replacements in a catalog (possibly by using the public identifier).
@since SAX 1.0 @author David Megginson @version 2.0.1 (sax2r2) @see org.xml.sax.XMLReader#setEntityResolver @see org.xml.sax.InputSource

  throws SAXException, IOException, ParserConfigurationException {
    XSContext data = getData();
    try {
      XsObjectFactory factory = data.getXsObjectFactory();
      XMLReader xr = factory.newXMLReader(isValidating());
      EntityResolver entityResolver = xr.getEntityResolver();
      InputSource schemaSource = null;
      if (entityResolver != null) {
        schemaSource = entityResolver.resolveEntity(null, pSchemaLocation);
      }
      if (schemaSource == null) {
        schemaSource = getInputSource(pLocator == null ? null : pLocator.getSystemId(),
            pSchemaLocation);
      }

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        String s = "<!DOCTYPE a SYSTEM 'uri:dtd'><a/>";
        InputSource isource = new InputSource(new StringReader(s));
        SAXParserFactory spf = SAXParserFactory.newInstance();
        spf.setValidating(false);
        XMLReader xr = spf.newSAXParser().getXMLReader();
        xr.setEntityResolver(new EntityResolver(){
      public InputSource resolveEntity(String publicId, String pSystemId) throws SAXException, IOException {
        return "uri:dtd".equals(pSystemId) ? pSource : null;
            }
        });
        DtdDeclHandler handler = new DtdDeclHandler();

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               return source;
            }
         }


         // first try to resolve using user's entity resolver
         EntityResolver resolver = fEntityHandler.getEntityResolver();
         if (resolver != null) {
            InputSource source = resolver.resolveEntity(publicId, systemId);
            if (source != null) {
               return source;
            }
         }

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    public FacesConfigDigester() {
        digester = new Digester();
        // TODO: validation set to false during implementation of 1.2
        digester.setValidating(false);
        digester.setNamespaceAware(true);
        digester.setEntityResolver(new EntityResolver() {


            @Override
            public InputSource resolveEntity(String arg0, String arg1) throws SAXException, IOException {
                return EMPTY_INPUT_SOURCE;
            }

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            if (validation) {
                factory.setAttribute(JAXP_SCHEMA_LANGUAGE, W3C_XML_SCHEMA);
            }
            
            DocumentBuilder builder = factory.newDocumentBuilder();
            builder.setEntityResolver(new EntityResolver() {


                public InputSource resolveEntity(String publicId, String systemId) throws IOException {
                    if (systemId != null && systemId.startsWith("http://www.jgroups.org/schema/JGroups-")) {
                        String schemaName = systemId.substring("http://www.jgroups.org/".length());                        
                        InputStream schemaIs = getAsInputStreamFromClassLoader(schemaName);

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  {
    try
    {
      DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
      this.documentBuilder = documentBuilderFactory.newDocumentBuilder();
      this.documentBuilder.setEntityResolver(new EntityResolver() {
        public InputSource resolveEntity(String publicId, String systemId)
        throws SAXException, IOException
        {
          if (systemId.contains("gwt-module.dtd"))
          {

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          builderFactory.setNamespaceAware(true);
          builderFactory.setIgnoringComments(true);
          builderFactory.setIgnoringElementContentWhitespace(true);
          
          documentBuilder = builderFactory.newDocumentBuilder();
          documentBuilder.setEntityResolver(new EntityResolver() {
            @Override
            public InputSource resolveEntity(String publicId, String systemId)
                throws SAXException, IOException {
              if (systemId.contains("crux-view.dtd"))
              {

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      debug.message(1, "Cannot read SAX catalog without a parser");
      throw new CatalogException(CatalogException.UNPARSEABLE);
    }


    debug = catalog.getCatalogManager().debug;
    EntityResolver bResolver = catalog.getCatalogManager().getBootstrapResolver();


    this.catalog = catalog;


    try {
      if (parserFactory != null) {

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      String outputType = null;
      String media = null;
      Vector params = new Vector();
      boolean quietConflictWarnings = false;
      URIResolver uriResolver = null;
      EntityResolver entityResolver = null;
      ContentHandler contentHandler = null;
      int recursionLimit=-1;


      for (int i = 0; i < argv.length; i++)
      {

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      debug.message(1, "Cannot read SAX catalog without a parser");
      throw new CatalogException(CatalogException.UNPARSEABLE);
    }


    debug = catalog.getCatalogManager().debug;
    EntityResolver bResolver = catalog.getCatalogManager().getBootstrapResolver();


    this.catalog = catalog;


    try {
      if (parserFactory != null) {

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