Class UseWhenFilter

  • All Implemented Interfaces:
    javax.xml.transform.Result, Receiver

    public class UseWhenFilter
    extends ProxyReceiver
    This is a filter inserted into the input pipeline for processing stylesheet modules, whose task is to evaluate use-when expressions and discard those parts of the stylesheet module for which the use-when attribute evaluates to false.
    • Constructor Detail

      • UseWhenFilter

        public UseWhenFilter​(Receiver next)
        Create a UseWhenFilter
        Parameters:
        next - the next receiver in the pipeline
    • Method Detail

      • setStartTagBuffer

        public void setStartTagBuffer​(StartTagBuffer startTag)
        Set the start tag buffer
        Parameters:
        startTag - a preceding filter on the pipeline that buffers the attributes of a start tag
      • startElement

        public void startElement​(NodeName elemName,
                                 SchemaType typeCode,
                                 int locationId,
                                 int properties)
                          throws XPathException
        Notify the start of an element.
        Specified by:
        startElement in interface Receiver
        Overrides:
        startElement in class ProxyReceiver
        Parameters:
        elemName - the name of the element.
        typeCode - integer code identifying the element's type within the name pool.
        properties - bit-significant properties of the element node
        locationId - an integer which can be interpreted using a LocationProvider to return information such as line number and system ID. If no location information is available, the value zero is supplied.
        Throws:
        XPathException - if an error occurs
      • namespace

        public void namespace​(NamespaceBinding namespaceBinding,
                              int properties)
                       throws XPathException
        Notify a namespace. Namespaces are notified after the startElement event, and before any children for the element. The namespaces that are reported are only required to include those that are different from the parent element; however, duplicates may be reported. A namespace must not conflict with any namespaces already used for element or attribute names.
        Specified by:
        namespace in interface Receiver
        Overrides:
        namespace in class ProxyReceiver
        Parameters:
        namespaceBinding -
        properties - any special properties to be passed on this call
        Throws:
        XPathException - if an error occurs
      • attribute

        public void attribute​(NodeName attName,
                              SimpleType typeCode,
                              java.lang.CharSequence value,
                              int locationId,
                              int properties)
                       throws XPathException
        Notify an attribute. Attributes are notified after the startElement event, and before any children. Namespaces and attributes may be intermingled.
        Specified by:
        attribute in interface Receiver
        Overrides:
        attribute in class ProxyReceiver
        Parameters:
        attName - The name of the attribute, as held in the name pool
        typeCode - The type of the attribute, as held in the name pool
        properties - Bit significant value. The following bits are defined:
        DISABLE_ESCAPING
        Disable escaping for this attribute
        NO_SPECIAL_CHARACTERS
        Attribute value contains no special characters
        value - the string value of the attribute
        locationId - an integer which can be interpreted using a LocationProvider to return information such as line number and system ID. If no location information is available, the value zero is supplied.
        Throws:
        XPathException - if an error occurs
      • startContent

        public void startContent()
                          throws XPathException
        Notify the start of the content, that is, the completion of all attributes and namespaces. Note that the initial receiver of output from XSLT instructions will not receive this event, it has to detect it itself. Note that this event is reported for every element even if it has no attributes, no namespaces, and no content.
        Specified by:
        startContent in interface Receiver
        Overrides:
        startContent in class ProxyReceiver
        Throws:
        XPathException - if an error occurs
      • characters

        public void characters​(java.lang.CharSequence chars,
                               int locationId,
                               int properties)
                        throws XPathException
        Character data
        Specified by:
        characters in interface Receiver
        Overrides:
        characters in class ProxyReceiver
        Parameters:
        chars - The characters
        locationId - an integer which can be interpreted using a LocationProvider to return information such as line number and system ID. If no location information is available, the value zero is supplied.
        properties - Bit significant value. The following bits are defined:
        DISABLE_ESCAPING
        Disable escaping for this text node
        USE_CDATA
        Output as a CDATA section
        Throws:
        XPathException - if an error occurs
      • processingInstruction

        public void processingInstruction​(java.lang.String target,
                                          java.lang.CharSequence data,
                                          int locationId,
                                          int properties)
        Processing Instruction
        Specified by:
        processingInstruction in interface Receiver
        Overrides:
        processingInstruction in class ProxyReceiver
        Parameters:
        target - The PI name. This must be a legal name (it will not be checked).
        data - The data portion of the processing instruction
        locationId - an integer which can be interpreted using a LocationProvider to return information such as line number and system ID. If no location information is available, the value zero is supplied.
        properties - Additional information about the PI.
      • comment

        public void comment​(java.lang.CharSequence chars,
                            int locationId,
                            int properties)
                     throws XPathException
        Output a comment
        Specified by:
        comment in interface Receiver
        Overrides:
        comment in class ProxyReceiver
        Parameters:
        chars - The content of the comment
        locationId - an integer which can be interpreted using a LocationProvider to return information such as line number and system ID. If no location information is available, the value zero is supplied.
        properties - Additional information about the comment.
        Throws:
        XPathException - if an error occurs
      • evaluateUseWhen

        public boolean evaluateUseWhen​(java.lang.String expression,
                                       int locationId)
                                throws XPathException
        Evaluate a use-when attribute
        Parameters:
        expression - the expression to be evaluated
        locationId - identifies the location of the expression in case error need to be reported
        Returns:
        the effective boolean value of the result of evaluating the expression
        Throws:
        XPathException