Interface XmlHandler

    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method Description
      void attribute​(java.lang.String aname, java.lang.String value, boolean isSpecified)
      Attribute.
      void charData​(char[] ch, int start, int length)
      Character data.
      void doctypeDecl​(java.lang.String name, java.lang.String publicId, java.lang.String systemId)
      Document type declaration.
      void endDocument()
      End the document.
      void endElement​(java.lang.String elname)
      End an element.
      void endExternalEntity​(java.lang.String systemId)
      End an external entity.
      void error​(java.lang.String message, java.lang.String systemId, int line, int column)
      Fatal XML parsing error.
      void ignorableWhitespace​(char[] ch, int start, int length)
      Ignorable whitespace.
      void processingInstruction​(java.lang.String target, java.lang.String data)
      Processing instruction.
      java.lang.Object resolveEntity​(java.lang.String publicId, java.lang.String systemId)
      Resolve an External Entity.
      void startDocument()
      Start the document.
      void startElement​(java.lang.String elname)
      Start an element.
      void startExternalEntity​(java.lang.String systemId)
      Begin an external entity.
    • Method Detail

      • startDocument

        void startDocument()
                    throws java.lang.Exception
        Start the document.

        Ælfred will call this method just before it attempts to read the first entity (the root of the document). It is guaranteed that this will be the first method called.

        Throws:
        java.lang.Exception - The handler may throw any exception.
        See Also:
        endDocument()
      • endDocument

        void endDocument()
                  throws java.lang.Exception
        End the document.

        Ælfred will call this method once, when it has finished parsing the XML document. It is guaranteed that this will be the last method called.

        Throws:
        java.lang.Exception - The handler may throw any exception.
        See Also:
        startDocument()
      • resolveEntity

        java.lang.Object resolveEntity​(java.lang.String publicId,
                                       java.lang.String systemId)
                                throws java.lang.Exception
        Resolve an External Entity.

        Give the handler a chance to redirect external entities to different URIs. Ælfred will call this method for the top-level document entity, for external text (XML) entities, and the external DTD subset (if any).

        Parameters:
        publicId - The public identifier, or null if none was supplied.
        systemId - The system identifier.
        Returns:
        The replacement system identifier, or null to use the default.
        Throws:
        java.lang.Exception - The handler may throw any exception.
        See Also:
        startExternalEntity(java.lang.String), endExternalEntity(java.lang.String)
      • startExternalEntity

        void startExternalEntity​(java.lang.String systemId)
                          throws java.lang.Exception
        Begin an external entity.

        Ælfred will call this method at the beginning of each external entity, including the top-level document entity and the external DTD subset (if any).

        If necessary, you can use this method to track the location of the current entity so that you can resolve relative URIs correctly.

        Parameters:
        systemId - The URI of the external entity that is starting.
        Throws:
        java.lang.Exception - The handler may throw any exception.
        See Also:
        endExternalEntity(java.lang.String), resolveEntity(java.lang.String, java.lang.String)
      • endExternalEntity

        void endExternalEntity​(java.lang.String systemId)
                        throws java.lang.Exception
        End an external entity.

        Ælfred will call this method at the end of each external entity, including the top-level document entity and the external DTD subset.

        If necessary, you can use this method to track the location of the current entity so that you can resolve relative URIs correctly.

        Parameters:
        systemId - The URI of the external entity that is ending.
        Throws:
        java.lang.Exception - The handler may throw any exception.
        See Also:
        startExternalEntity(java.lang.String), resolveEntity(java.lang.String, java.lang.String)
      • doctypeDecl

        void doctypeDecl​(java.lang.String name,
                         java.lang.String publicId,
                         java.lang.String systemId)
                  throws java.lang.Exception
        Document type declaration.

        Ælfred will call this method when or if it encounters the document type (DOCTYPE) declaration.

        Please note that the public and system identifiers will not always be a reliable indication of the DTD in use.

        Parameters:
        name - The document type name.
        publicId - The public identifier, or null if unspecified.
        systemId - The system identifier, or null if unspecified.
        Throws:
        java.lang.Exception - The handler may throw any exception.
      • charData

        void charData​(char[] ch,
                      int start,
                      int length)
               throws java.lang.Exception
        Character data.

        Ælfred will call this method once for each chunk of character data found in the contents of elements. Note that the parser may break up a long sequence of characters into smaller chunks and call this method once for each chunk.

        Do not attempt to read more than length characters from the array, or to read before the start position.

        Parameters:
        ch - The character data.
        start - The starting position in the array.
        length - The number of characters available.
        Throws:
        java.lang.Exception - The handler may throw any exception.
      • ignorableWhitespace

        void ignorableWhitespace​(char[] ch,
                                 int start,
                                 int length)
                          throws java.lang.Exception
        Ignorable whitespace.

        Ælfred will call this method once for each sequence of ignorable whitespace in element content (never in mixed content).

        For details, see section 2.10 of the XML 1.0 recommendation.

        Do not attempt to read more than length characters from the array or to read before the start position.

        Parameters:
        ch - The literal whitespace characters.
        start - The starting position in the array.
        length - The number of whitespace characters available.
        Throws:
        java.lang.Exception - The handler may throw any exception.
      • processingInstruction

        void processingInstruction​(java.lang.String target,
                                   java.lang.String data)
                            throws java.lang.Exception
        Processing instruction.

        Ælfred will call this method once for each processing instruction. Note that processing instructions may appear outside of the top-level element. The

        Parameters:
        target - The target (the name at the start of the PI).
        data - The data, if any (the rest of the PI).
        Throws:
        java.lang.Exception - The handler may throw any exception.
      • error

        void error​(java.lang.String message,
                   java.lang.String systemId,
                   int line,
                   int column)
            throws java.lang.Exception
        Fatal XML parsing error.

        Ælfred will call this method whenever it encounters a serious error. The parser will attempt to continue past this point so that you can find more possible error points, but if this method is called you should assume that the document is corrupt and you should not try to use its contents.

        Note that you can use the XmlException class to encapsulate all of the information provided, though the use of the class is not mandatory.

        Parameters:
        message - The error message.
        systemId - The system identifier of the entity that contains the error.
        line - The approximate line number of the error.
        column - The approximate column number of the error.
        Throws:
        java.lang.Exception - The handler may throw any exception.
        See Also:
        XmlException