Class DOMObjectModel

  • All Implemented Interfaces:
    ExternalObjectModel

    public class DOMObjectModel
    extends TreeModel
    implements ExternalObjectModel
    This interface must be implemented by any third-party object model that can be wrapped with a wrapper that implements the Saxon Object Model (the NodeInfo interface). This implementation of the interface supports wrapping of DOM Documents.
    • Constructor Summary

      Constructors 
      Constructor Description
      DOMObjectModel()
      Create an instance of the DOMObjectModel class.
    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      static java.lang.Object convertXPathValueToObject​(Sequence value, java.lang.Class<?> target)
      Convert an XPath value to an object in this object model.
      NodeInfo copy​(org.w3c.dom.Node node, TreeModel model, Configuration config)
      Copy a DOM node to create a node in a different tree model
      ActiveSource getActiveSource​(javax.xml.transform.Source supplied)
      Give this ExternalObjectModel the opportunity of recognising a Source object and returning an ActiveSource, which will be used to send an instance of this external model to a supplied Receiver.
      Receiver getDocumentBuilder​(javax.xml.transform.Result result)
      Test whether this object model recognizes a particular kind of JAXP Result object, and if it does, return a Receiver that builds an instance of this data model from a sequence of events.
      java.lang.String getDocumentClassName()
      Get the name of a characteristic class, which, if it can be loaded, indicates that the supporting libraries for this object model implementation are available on the classpath
      java.lang.String getIdentifyingURI()
      Get the URI of the external object model as used in the JAXP factory interfaces for obtaining an XPath implementation
      static DOMObjectModel getInstance()
      Get a reusable instance of this class.
      JPConverter getJPConverter​(java.lang.Class sourceClass, Configuration config)
      Get a converter from values in the external object model to XPath values.
      java.lang.String getName()
      Get a name that identifies the tree model
      PJConverter getNodeListCreator​(java.lang.Object node)
      Get a converter that converts a sequence of XPath nodes to this model's representation of a node list.
      PJConverter getPJConverter​(java.lang.Class<?> targetClass)
      Get a converter from XPath values to values in the external object model
      Builder makeBuilder​(PipelineConfiguration pipe)
      Make a Builder, which can then be used to construct an instance of this tree model from a stream of events
      static void sendDOMSource​(javax.xml.transform.dom.DOMSource source, Receiver receiver)  
      NodeInfo unravel​(javax.xml.transform.Source source, Configuration config)
      Wrap or unwrap a node using this object model to return the corresponding Saxon node.
      NodeInfo wrap​(org.w3c.dom.Node node, Configuration config)
      Wrap a DOM node using this object model to return the corresponding Saxon node.
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Constructor Detail

      • DOMObjectModel

        public DOMObjectModel()
        Create an instance of the DOMObjectModel class.

        When possible, use the getInstance() method in preference, as the instance is then reusable.

    • Method Detail

      • getInstance

        public static DOMObjectModel getInstance()
        Get a reusable instance of this class.

        Note, this is not actually a singleton instance; the class also has a public constructor, which is needed to support the automatic loading of object models into the Configuration.

        Returns:
        the singleton instance
      • getDocumentClassName

        public java.lang.String getDocumentClassName()
        Get the name of a characteristic class, which, if it can be loaded, indicates that the supporting libraries for this object model implementation are available on the classpath
        Specified by:
        getDocumentClassName in interface ExternalObjectModel
        Returns:
        by convention (but not necessarily) the class that implements a document node in the relevant external model
      • getIdentifyingURI

        public java.lang.String getIdentifyingURI()
        Get the URI of the external object model as used in the JAXP factory interfaces for obtaining an XPath implementation
        Specified by:
        getIdentifyingURI in interface ExternalObjectModel
        Returns:
        the URI used to identify this object model in the JAXP XPath factory mechanism.
      • getName

        public java.lang.String getName()
        Description copied from class: TreeModel
        Get a name that identifies the tree model
        Overrides:
        getName in class TreeModel
        Returns:
        an identifying name for the tree model
      • getPJConverter

        public PJConverter getPJConverter​(java.lang.Class<?> targetClass)
        Get a converter from XPath values to values in the external object model
        Specified by:
        getPJConverter in interface ExternalObjectModel
        Parameters:
        targetClass - the required class of the result of the conversion. If this class represents a node or list of nodes in the external object model, the method should return a converter that takes a native node or sequence of nodes as input and returns a node or sequence of nodes in the external object model representation. Otherwise, it should return null.
        Returns:
        a converter, if the targetClass is recognized as belonging to this object model; otherwise null
      • getJPConverter

        public JPConverter getJPConverter​(java.lang.Class sourceClass,
                                          Configuration config)
        Description copied from interface: ExternalObjectModel
        Get a converter from values in the external object model to XPath values.
        Specified by:
        getJPConverter in interface ExternalObjectModel
        Parameters:
        sourceClass - the class (static or dynamic) of values to be converted
        config - the Saxon Configuration object
        Returns:
        a converter, if the sourceClass is recognized as belonging to this object model; otherwise null
      • getNodeListCreator

        public PJConverter getNodeListCreator​(java.lang.Object node)
        Get a converter that converts a sequence of XPath nodes to this model's representation of a node list.
        Specified by:
        getNodeListCreator in interface ExternalObjectModel
        Parameters:
        node - an example of the kind of node used in this model
        Returns:
        if the model does not recognize this node as one of its own, return null. Otherwise return a PJConverter that takes a list of XPath nodes (represented as NodeInfo objects) and returns a collection of nodes in this object model
      • getDocumentBuilder

        public Receiver getDocumentBuilder​(javax.xml.transform.Result result)
                                    throws XPathException
        Test whether this object model recognizes a particular kind of JAXP Result object, and if it does, return a Receiver that builds an instance of this data model from a sequence of events. If the Result is not recognised, or is not a DOMResult, return null.
        Specified by:
        getDocumentBuilder in interface ExternalObjectModel
        Parameters:
        result - a JAXP result object
        Returns:
        either a Receiver that can be used to build a DOM instance, or null
        Throws:
        XPathException - if any failure occurs
      • getActiveSource

        public ActiveSource getActiveSource​(javax.xml.transform.Source supplied)
        Give this ExternalObjectModel the opportunity of recognising a Source object and returning an ActiveSource, which will be used to send an instance of this external model to a supplied Receiver. The default implementation returns null.
        Specified by:
        getActiveSource in interface ExternalObjectModel
        Parameters:
        supplied - a supplied Source
        Returns:
        an ActiveSource object if the source is recognised, or null if not
      • wrap

        public NodeInfo wrap​(org.w3c.dom.Node node,
                             Configuration config)
        Wrap a DOM node using this object model to return the corresponding Saxon node.
        Parameters:
        node - the DOM node to be wrapped
        config - the Saxon Configuration
        Returns:
        the wrapped DOM node
        Since:
        9.2
      • copy

        public NodeInfo copy​(org.w3c.dom.Node node,
                             TreeModel model,
                             Configuration config)
                      throws XPathException
        Copy a DOM node to create a node in a different tree model
        Parameters:
        node - the DOM node to be copied
        model - the target tree model
        config - the Saxon Configuration
        Returns:
        the copied node
        Throws:
        XPathException - if the operation fails
        Since:
        9.2
      • unravel

        public NodeInfo unravel​(javax.xml.transform.Source source,
                                Configuration config)
        Wrap or unwrap a node using this object model to return the corresponding Saxon node. If the supplied source does not belong to this object model, return null
        Specified by:
        unravel in interface ExternalObjectModel
        Parameters:
        source - a JAXP Source object
        config - the Saxon configuration
        Returns:
        a NodeInfo corresponding to the Source, if this can be constructed; otherwise null
      • convertXPathValueToObject

        public static java.lang.Object convertXPathValueToObject​(Sequence value,
                                                                 java.lang.Class<?> target)
                                                          throws XPathException
        Convert an XPath value to an object in this object model. If the supplied value can be converted to an object in this model, of the specified class, then the conversion should be done and the resulting object returned. If the value cannot be converted, the method should return null. Note that the supplied class might be a List, in which case the method should inspect the contents of the Value to see whether they belong to this object model.
        Parameters:
        value - the XPath value to be converted
        target - the class of object required
        Returns:
        the result of the conversion
        Throws:
        XPathException - if the target class is explicitly associated with this object model, but the supplied value cannot be converted to the appropriate class