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

        InputStream stream = new AddDTDFilterInputStream(URLHandlerRegistry.getDefault()
                .openStream(descriptorURL));
        InputSource source = new InputSource(stream);
        source.setSystemId(XMLHelper.toSystemId(descriptorURL));
        try {
            Document pomDomDoc = XMLHelper.parseToDom(source, new EntityResolver() {
                public InputSource resolveEntity(String publicId, String systemId)
                        throws SAXException, IOException {
                    if ((systemId != null) && systemId.endsWith("m2-entities.ent")) {
                        return new InputSource(PomReader.class
                                .getResourceAsStream("m2-entities.ent"));

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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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                e.printStackTrace();
              }
          }
         // expand it before passing it to the parser
         InputSource source = null;
         EntityResolver currentER = fSchemaGrammarParser.getEntityResolver();
         if (currentER != null) {
            source = currentER.resolveEntity("", loc);
         }
         if (source == null) {
            loc = fEntityHandler.expandSystemId(loc);
            source = new InputSource(loc);
         }

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            e.printStackTrace();
         }


         // expand it before passing it to the parser
         InputSource source = null;
         EntityResolver currentER = parser.getEntityResolver();
         if (currentER != null) {
            source = currentER.resolveEntity("", loc);
         }
         if (source == null) {
            loc = fEntityHandler.expandSystemId(loc);
            source = new InputSource(loc);
         }

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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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      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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    private static SaxLoader getSaxLoader(XmlOptions options)
    {
        options = XmlOptions.maskNull(options);


        EntityResolver er = null;


        if (!options.hasOption(XmlOptions.LOAD_USE_DEFAULT_RESOLVER))
        {
            er = (EntityResolver) options.get(XmlOptions.ENTITY_RESOLVER);

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                    urls.add(file.toURL());
                    System.out.println("Adding to classpath: " + file);
                }
            }
            ClassLoader cl = new URLClassLoader((URL[]) urls.toArray(new URL[] {}));
            EntityResolver entityResolver = null;
            if (catalogLocation != null) {
                CatalogManager catalogManager = CatalogManager.getStaticManager();
                catalogManager.setCatalogFiles(catalogLocation);
                entityResolver = new CatalogResolver();
            }

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            documentBuilderFactory = DocumentBuilderFactory.newInstance();
            documentBuilderFactory.setNamespaceAware(true);
            documentBuilderFactory.setExpandEntityReferences(false);
            documentBuilder = documentBuilderFactory.newDocumentBuilder();
            documentBuilder.setEntityResolver
                (new EntityResolver() {
                    public InputSource resolveEntity(String publicId, String systemId) 
                        throws SAXException, IOException {
                        return new InputSource(new StringReader(""));
                    }
                });

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      InputStream in = URLToStreamHelper.urlToStream(resourceConfig);
      try {
        Digester digester = new Digester();
        digester.setValidating(false);
        digester.setEntityResolver(new EntityResolver() {
          // Dummi resolver - alvays do nothing
          public InputSource resolveEntity(String publicId,
              String systemId) throws SAXException, IOException {
            return new InputSource(new StringReader(""));
          }

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