Class UnconstructedParent

  • All Implemented Interfaces:
    javax.xml.transform.Source, Item, NodeInfo, ValueRepresentation
    Direct Known Subclasses:
    UnconstructedDocument, UnconstructedElement

    public abstract class UnconstructedParent
    extends java.lang.Object
    implements NodeInfo
    This class represents a virtual element node, the result of an element constructor that (in general) hasn't been fully evaluated. This is similar to a Closure, except that it is a NodeInfo rather than a Value. The object is capable of materializing the element if it is actually needed, but the aim is to avoid materializing the element wherever possible, at any rate not until its parent element is constructed so that this element can be built in-situ rather than being built as a standalone element and then later copied. This class is not currently used for elements that require schema validation.
    • Method Detail

      • construct

        void construct()
                throws XPathException
        Method to construct the node when this is required.
        Throws:
        XPathException - if any failure occurs
      • tryToConstruct

        void tryToConstruct()
        Method to construct the node when this is required.

        Note that this may throw an UncheckedXPathException. This is because many of the methods on the NodeInfo class are exception-free; we can't throw an XPathException on these interfaces, but may need to in this case because lazy computation of expressions may throw errors.

        Throws:
        UncheckedXPathException
      • isSameNodeInfo

        public boolean isSameNodeInfo​(NodeInfo other)
        Determine whether this is the same node as another node. Note: a.isSameNodeInfo(b) if and only if generateId(a)==generateId(b). This method has the same semantics as isSameNode() in DOM Level 3, but works on Saxon NodeInfo objects rather than DOM Node objects.
        Specified by:
        isSameNodeInfo in interface NodeInfo
        Parameters:
        other - the node to be compared with this node
        Returns:
        true if this NodeInfo object and the supplied NodeInfo object represent the same node in the tree.
      • equals

        public boolean equals​(java.lang.Object other)
        The equals() method compares nodes for identity. It is defined to give the same result as isSameNodeInfo().
        Specified by:
        equals in interface NodeInfo
        Overrides:
        equals in class java.lang.Object
        Parameters:
        other - the node to be compared with this node
        Returns:
        true if this NodeInfo object and the supplied NodeInfo object represent the same node in the tree.
        Since:
        8.7 Previously, the effect of the equals() method was not defined. Callers should therefore be aware that third party implementations of the NodeInfo interface may not implement the correct semantics. It is safer to use isSameNodeInfo() for this reason. The equals() method has been defined because it is useful in contexts such as a Java Set or HashMap.
      • hashCode

        public int hashCode()
        The hashCode() method obeys the contract for hashCode(): that is, if two objects are equal (represent the same node) then they must have the same hashCode()
        Specified by:
        hashCode in interface NodeInfo
        Overrides:
        hashCode in class java.lang.Object
        Since:
        8.7 Previously, the effect of the equals() and hashCode() methods was not defined. Callers should therefore be aware that third party implementations of the NodeInfo interface may not implement the correct semantics.
      • getSystemId

        public java.lang.String getSystemId()
        Get the System ID for the node (that is, the document URI of the containing document node).
        Specified by:
        getSystemId in interface NodeInfo
        Specified by:
        getSystemId in interface javax.xml.transform.Source
        Returns:
        the System Identifier of the source document containing the node, or null if not known. Note this is not the same as the base URI: the base URI can be modified by xml:base, but the system ID cannot.
      • getBaseURI

        public java.lang.String getBaseURI()
        Get the Base URI for the node, that is, the URI used for resolving a relative URI contained in the node. This will be the same as the System ID unless xml:base has been used.
        Specified by:
        getBaseURI in interface NodeInfo
        Returns:
        the base URI of the node
      • getLineNumber

        public int getLineNumber()
        Get line number
        Specified by:
        getLineNumber in interface NodeInfo
        Returns:
        the line number of the node in its original source document; or -1 if not available
      • compareOrder

        public int compareOrder​(NodeInfo other)
        Determine the relative position of this node and another node, in document order. The other node will always be in the same document.
        Specified by:
        compareOrder in interface NodeInfo
        Parameters:
        other - The other node, whose position is to be compared with this node
        Returns:
        -1 if this node precedes the other node, +1 if it follows the other node, or 0 if they are the same node. (In this case, isSameNode() will always return true, and the two nodes will produce the same result for generateId())
      • getStringValue

        public java.lang.String getStringValue()
        Return the string value of the node. The interpretation of this depends on the type of node. For an element it is the accumulated character content of the element, including descendant elements.
        Specified by:
        getStringValue in interface Item
        Specified by:
        getStringValue in interface NodeInfo
        Specified by:
        getStringValue in interface ValueRepresentation
        Returns:
        the string value of the node
        See Also:
        Item.getStringValueCS()
      • getFingerprint

        public int getFingerprint()
        Get fingerprint. The fingerprint is a coded form of the expanded name of the node: two nodes with the same name code have the same namespace URI and the same local name. A fingerprint of -1 should be returned for a node with no name.
        Specified by:
        getFingerprint in interface NodeInfo
        Returns:
        an integer fingerprint; two nodes with the same fingerprint have the same expanded QName
      • getLocalPart

        public java.lang.String getLocalPart()
        Get the local part of the name of this node. This is the name after the ":" if any.
        Specified by:
        getLocalPart in interface NodeInfo
        Returns:
        the local part of the name. For an unnamed node, returns "". Unlike the DOM interface, this returns the full name in the case of a non-namespaced name.
      • getURI

        public java.lang.String getURI()
        Get the URI part of the name of this node. This is the URI corresponding to the prefix, or the URI of the default namespace if appropriate.
        Specified by:
        getURI in interface NodeInfo
        Returns:
        The URI of the namespace of this node. For an unnamed node, or for a node with an empty prefix, return an empty string.
      • getDisplayName

        public java.lang.String getDisplayName()
        Get the display name of this node. For elements and attributes this is [prefix:]localname. For unnamed nodes, it is an empty string.
        Specified by:
        getDisplayName in interface NodeInfo
        Returns:
        The display name of this node. For a node with no name, return an empty string.
      • getPrefix

        public java.lang.String getPrefix()
        Get the prefix of the name of the node. This is defined only for elements and attributes. If the node has no prefix, or for other kinds of node, return a zero-length string.
        Specified by:
        getPrefix in interface NodeInfo
        Returns:
        The prefix of the name of the node.
      • getNamePool

        public NamePool getNamePool()
        Get the NamePool that holds the namecode for this node
        Specified by:
        getNamePool in interface NodeInfo
        Returns:
        the namepool
      • getTypeAnnotation

        public int getTypeAnnotation()
        Get the type annotation of this node, if any. Returns -1 for kinds of nodes that have no annotation
        Specified by:
        getTypeAnnotation in interface NodeInfo
        Returns:
        the type annotation of the node.
        See Also:
        Type
      • getParent

        public NodeInfo getParent()
        Get the NodeInfo object representing the parent of this node
        Specified by:
        getParent in interface NodeInfo
        Returns:
        the parent of this node; null if this node has no parent
      • iterateAxis

        public AxisIterator iterateAxis​(byte axisNumber)
        Return an iteration over all the nodes reached by the given axis from this node
        Specified by:
        iterateAxis in interface NodeInfo
        Parameters:
        axisNumber - an integer identifying the axis; one of the constants defined in class net.sf.saxon.om.Axis
        Returns:
        an AxisIterator that scans the nodes reached by the axis in turn.
        Throws:
        java.lang.UnsupportedOperationException - if the namespace axis is requested and this axis is not supported for this implementation.
        See Also:
        Axis
      • iterateAxis

        public AxisIterator iterateAxis​(byte axisNumber,
                                        NodeTest nodeTest)
        Return an iteration over all the nodes reached by the given axis from this node that match a given NodeTest
        Specified by:
        iterateAxis in interface NodeInfo
        Parameters:
        axisNumber - an integer identifying the axis; one of the constants defined in class net.sf.saxon.om.Axis
        nodeTest - A pattern to be matched by the returned nodes; nodes that do not match this pattern are not included in the result
        Returns:
        a NodeEnumeration that scans the nodes reached by the axis in turn.
        Throws:
        java.lang.UnsupportedOperationException - if the namespace axis is requested and this axis is not supported for this implementation.
        See Also:
        Axis
      • getAttributeValue

        public java.lang.String getAttributeValue​(int fingerprint)
        Get the value of a given attribute of this node
        Specified by:
        getAttributeValue in interface NodeInfo
        Parameters:
        fingerprint - The fingerprint of the attribute name
        Returns:
        the attribute value if it exists or null if not
      • getRoot

        public NodeInfo getRoot()
        Get the root node of the tree containing this node
        Specified by:
        getRoot in interface NodeInfo
        Returns:
        the NodeInfo representing the top-level ancestor of this node. This will not necessarily be a document node
      • getDocumentRoot

        public DocumentInfo getDocumentRoot()
        Get the root node, if it is a document node.
        Specified by:
        getDocumentRoot in interface NodeInfo
        Returns:
        the DocumentInfo representing the containing document. If this node is part of a tree that does not have a document node as its root, return null.
      • hasChildNodes

        public boolean hasChildNodes()
        Determine whether the node has any children.
        Note: the result is equivalent to
        getEnumeration(Axis.CHILD, AnyNodeTest.getInstance()).hasNext()
        Specified by:
        hasChildNodes in interface NodeInfo
        Returns:
        True if the node has one or more children
      • generateId

        public void generateId​(FastStringBuffer buffer)
        Get a character string that uniquely identifies this node. Note: a.isSameNode(b) if and only if generateId(a)==generateId(b)
        Specified by:
        generateId in interface NodeInfo
        Parameters:
        buffer - a buffer, into which will be placed a string that uniquely identifies this node, across all documents.
      • getDocumentNumber

        public int getDocumentNumber()
        Get the document number of the document containing this node. For a free-standing orphan node, just return the hashcode.
        Specified by:
        getDocumentNumber in interface NodeInfo
      • copy

        public void copy​(Receiver out,
                         int whichNamespaces,
                         boolean copyAnnotations,
                         int locationId)
                  throws XPathException
        Copy this node to a given outputter
        Specified by:
        copy in interface NodeInfo
        Parameters:
        out - the Receiver to which the node should be copied
        whichNamespaces - in the case of an element, controls which namespace nodes should be copied. Values are NodeInfo.NO_NAMESPACES, NodeInfo.LOCAL_NAMESPACES, NodeInfo.ALL_NAMESPACES
        copyAnnotations - indicates whether the type annotations of element and attribute nodes should be copied
        locationId - If non-zero, identifies the location of the instruction that requested this copy. If zero, indicates that the location information for the original node is to be copied; in this case the Receiver must be a LocationCopier
        Throws:
        XPathException
      • sendNamespaceDeclarations

        public void sendNamespaceDeclarations​(Receiver out,
                                              boolean includeAncestors)
                                       throws XPathException
        Output all namespace declarations associated with this element. Does nothing if the node is not an element.
        Specified by:
        sendNamespaceDeclarations in interface NodeInfo
        Parameters:
        out - The relevant Receiver
        includeAncestors - True if namespaces declared on ancestor elements must be output; false if it is known that these are
        Throws:
        XPathException
      • getDeclaredNamespaces

        public int[] getDeclaredNamespaces​(int[] buffer)
        Get all namespace undeclarations and undeclarations defined on this element.
        Specified by:
        getDeclaredNamespaces in interface NodeInfo
        Parameters:
        buffer - If this is non-null, and the result array fits in this buffer, then the result may overwrite the contents of this array, to avoid the cost of allocating a new array on the heap.
        Returns:
        An array of integers representing the namespace declarations and undeclarations present on this element. For a node other than an element, return null. Otherwise, the returned array is a sequence of namespace codes, whose meaning may be interpreted by reference to the name pool. The top half word of each namespace code represents the prefix, the bottom half represents the URI. If the bottom half is zero, then this is a namespace undeclaration rather than a declaration. The XML namespace is never included in the list. If the supplied array is larger than required, then the first unused entry will be set to -1.

        For a node other than an element, the method returns null.

      • setSystemId

        public void setSystemId​(java.lang.String systemId)
        Set the system identifier for this Source.

        The system identifier is optional if the source does not get its data from a URL, but it may still be useful to provide one. The application can use a system identifier, for example, to resolve relative URIs and to include in error messages and warnings.

        Specified by:
        setSystemId in interface javax.xml.transform.Source
        Parameters:
        systemId - The system identifier as a URL string.
      • getStringValueCS

        public java.lang.CharSequence getStringValueCS()
        Get the value of the item as a CharSequence. This is in some cases more efficient than the version of the method that returns a String.
        Specified by:
        getStringValueCS in interface Item
        Specified by:
        getStringValueCS in interface ValueRepresentation
        Returns:
        the string value of the item
        See Also:
        Item.getStringValue()
      • getTypedValue

        public SequenceIterator getTypedValue()
                                       throws XPathException
        Get the typed value of the item
        Specified by:
        getTypedValue in interface Item
        Returns:
        the typed value of the item. In general this will be a sequence
        Throws:
        XPathException - where no typed value is available, e.g. for an element with complex content
      • atomize

        public Value atomize()
                      throws XPathException
        Get the typed value. The result of this method will always be consistent with the method Item.getTypedValue(). However, this method is often more convenient and may be more efficient, especially in the common case where the value is expected to be a singleton.
        Specified by:
        atomize in interface NodeInfo
        Returns:
        the typed value. If requireSingleton is set to true, the result will always be an AtomicValue. In other cases it may be a Value representing a sequence whose items are atomic values.
        Throws:
        XPathException
        Since:
        8.5