Return the applicable ENTITY system identifier.
@param entityName The name of the entity for whicha system identifier is required. @param publicId The nominal public identifier for the entity(as provided in the source document). @param systemId The nominal system identifier for the entity(as provided in the source document). @return The system identifier to use for the entity. @throws MalformedURLException The formal system identifier of asubordinate catalog cannot be turned into a valid URL. @throws IOException Error reading subordinate catalog file.resolveEntity
method for the SAX interface. Presented with an optional public identifier and a system identifier, this function attempts to locate a mapping in the catalogs.
If such a mapping is found, the resolver attempts to open the mapped value as an InputSource and return it. Exceptions are ignored and null is returned if the mapped value cannot be opened as an input source.
If no mapping is found (or an error occurs attempting to open the mapped value as an input source), null is returned and the system will use the specified system identifier as if no entityResolver was specified.
@param publicId The public identifier for the entity in question.This may be null. @param systemId The system identifier for the entity in question.XML requires a system identifier on all external entities, so this value is always specified. @return An InputSource for the mapped identifier, or null.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.
@param publicId The public identifier of the external entitybeing referenced, or null if none was supplied. @param systemId The system identifier of the external entitybeing referenced. @return An InputSource object describing the new input source,or null to request that the parser open a regular URI connection to the system identifier. @exception org.xml.sax.SAXException Any SAX exception, possiblywrapping another exception. @exception java.io.IOException A Java-specific IO exception,possibly the result of creating a new InputStream or Reader for the InputSource. @see org.xml.sax.InputSource
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