Package net.sf.saxon.lib

Class StandardEntityResolver

  • All Implemented Interfaces:
    org.xml.sax.EntityResolver
    public class StandardEntityResolver
extends java.lang.Object
implements org.xml.sax.EntityResolver
    This class is an EntityResolver used to resolve references to common DTDs and entity files, using local copies provided with the Saxon product. It has become necessary to do this because W3C is no longer serving these files from its server. Ideally the job of caching these files would belong to the XML parser, but because many of the parsers were issued years ago, they cannot be relied on to do it.

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      static org.xml.sax.InputSource fetch​(java.lang.String filename, Configuration config)
      Get the source from a given file.
      protected org.xml.sax.InputSource getResource​(java.lang.String resourceName, Configuration config)
      Get a resource from the classpath.
      static void register​(java.lang.String publicId, java.lang.String systemId, java.lang.String fileName)
      Register a DTD or other entity to be resolved by this entity resolver
      org.xml.sax.InputSource resolveEntity​(java.lang.String publicId, java.lang.String systemId)
      Allow the application to resolve external entities.
      void setConfiguration​(Configuration config)
      Set configuration details.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • StandardEntityResolver

        public StandardEntityResolver​(Configuration config)

    • Method Detail

      • register

        public static void register​(java.lang.String publicId,
                            java.lang.String systemId,
                            java.lang.String fileName)
        Register a DTD or other entity to be resolved by this entity resolver
        Parameters:
        publicId - the public identifier of the DTD or entity
        systemId - the system identifier of the DTD or entity. For domains that are known to redirect http: to https:, either scheme is accepted.
        fileName - the fileName of the Saxon local copy of the resource, relative to the data directory in the JAR file

      • setConfiguration

        public void setConfiguration​(Configuration config)
        Set configuration details. This is used to control tracing of accesses to files
        Parameters:
        config - the Saxon configuration

      • resolveEntity

        public org.xml.sax.InputSource resolveEntity​(java.lang.String publicId,
                                             java.lang.String systemId)
                                      throws org.xml.sax.SAXException
        Allow the application to resolve external entities.

        The parser will call this method before opening any external entity except the top-level document entity. Such entities include the external DTD subset and external parameter entities referenced within the DTD (in either case, only if the parser reads external parameter entities), and external general entities referenced within the document element (if the parser reads external general entities). The application may request that the parser locate the entity itself, that it use an alternative URI, or that it use data provided by the application (as a character or byte input stream).

        Application writers can use this method to redirect external system identifiers to secure and/or local URIs, to look up public identifiers in a catalogue, or to read an entity from a database or other input source (including, for example, a dialog box). Neither XML nor SAX specifies a preferred policy for using public or system IDs to resolve resources. However, SAX specifies how to interpret any InputSource returned by this method, and that if none is returned, then the system ID will be dereferenced as a URL.

        If the system identifier is a URL, the SAX parser must resolve it fully before reporting it to the application.

        Specified by:
        resolveEntity in interface org.xml.sax.EntityResolver
        Parameters:
        publicId - The public identifier of the external entity being referenced, or null if none was supplied.
        systemId - The system identifier of the external entity being referenced.
        Returns:
        An InputSource object describing the new input source, or null to request that the parser open a regular URI connection to the system identifier.
        Throws:
        org.xml.sax.SAXException - Any SAX exception, possibly wrapping another exception.
        See Also:
        InputSource

      • fetch

        public static org.xml.sax.InputSource fetch​(java.lang.String filename,
                                            Configuration config)
        Get the source from a given file.
        Parameters:
        filename - the name of the file
        config - the Saxon Configuration
        Returns:
        an InputSource representing the contents of the file.

      • getResource

        protected org.xml.sax.InputSource getResource​(java.lang.String resourceName,
                                              Configuration config)
        Get a resource from the classpath. This method is called if the URI uses the (Spring-defined) "classpath" URI scheme. It attempts to locate the resource on the classpath and returns an InputSource containing the relevant InputStream. If the inputstream cannot be located, it returns null. A subclass that does not want classpath URIs to be resolved in this way should override this method to return null unconditionally.
        Parameters:
        resourceName - the resource to be fetched from the classpath
        config - the Saxon Configuration object
        Returns:
        an InputSource representing the named resource (fetched from the classpath) or null if no resource is available.