Eclipse JET Guide (Galileo) - INodeInspector (JET Javadoc)

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org.eclipse.jet.xpath.inspector
Interface INodeInspector

All Known Subinterfaces:: IElementInspector

public interface INodeInspector

Interface providing the XPath parser with information on a particular object. An inspector is specific to classes of a particular Java type. The inspector will only receive objects of the types for which it is registered.

Inspectors may be manually registered via InspectorManager.registerInspector(Class[], Class), or via the org.eclipse.jet.modelInsecptors extension point.

An inspector's responsibilies are

Map each received object to one of the XPath node kinds, as defined in INodeInspector.NodeKind. For any given object, getNodeKind(Object) should always return the same value.

Implement the inspector functions consistently with the XPath 1.0 data model node to which the object is mapped.

An inspector may choose to implement the following extension interfaces:

INodeInspectorExtension1 - to provide name-based searching of children. This optional extension may provide efficient resolution of name-based XPath navigations such as $x/foo.

IElementInspector - provide extra information for objects that are mapped to XPath Elements. This interface must be implemented if the node inspector's implementation of getNodeKind(Object) returns INodeInspector.NodeKind.ELEMENT.

Nested Class Summary

static class INodeInspector.NodeKind
          A type safe enumeration of node kinds recognized by the JET XPath engine.

Method Summary

ExpandedName expandedNameOf (java.lang.Object node)
          Return the expanded name of the node.

java.lang.Object[] getChildren (java.lang.Object node)
          Return the child nodes of the context node.

java.lang.Object getDocumentRoot (java.lang.Object node)
          Return the document root for the contenxt node.

INodeInspector.NodeKind getNodeKind (java.lang.Object obj)
          Return the XPath node kind of the passed object.

java.lang.Object getParent (java.lang.Object obj)
          Return the parent of the passed object

java.lang.String nameOf (java.lang.Object node)
          Return the 'name' of the node.

java.lang.String stringValueOf (java.lang.Object node)
          Return the string value of the passed node.

boolean testExpandedName (java.lang.Object node, ExpandedName testName)
          Determine whether the name of the node matches the passed expanded name.

Method Detail

getNodeKind


INodeInspector.NodeKind getNodeKind(java.lang.Object obj)

Return the XPath node kind of the passed object.

Parameters:: obj - an object to inspect. Will not be null.
Returns:: the node kind. May be null if not recognized.

getParent

java.lang.Object getParent(java.lang.Object obj)

Return the parent of the passed object

Parameters:: obj - an object, will not be null.
Returns:: the parent, which may be null.

stringValueOf

java.lang.String stringValueOf(java.lang.Object node)

Return the string value of the passed node.

Parameters:: node - the node. Will not be null.
Returns:: the string value. Will not be null, but may be the empty string.

expandedNameOf


ExpandedName expandedNameOf(java.lang.Object node)

Return the expanded name of the node.

Parameters:: node - a node from which an expanded name is sought
Returns:: an ExpandedName instance, or null if the node has not expanded name.

testExpandedName

boolean testExpandedName(java.lang.Object node,
                         
ExpandedName testName)

Determine whether the name of the node matches the passed expanded name.

Parameters:: testName - an expanded name
Returns:: true if there is a match, false otherwise.

getDocumentRoot

java.lang.Object getDocumentRoot(java.lang.Object node)

Return the document root for the contenxt node.

Parameters:: node - the node. Will not be null.
Returns:: the document root, or null if a root cannot be determined.

getChildren

java.lang.Object[] getChildren(java.lang.Object node)

Return the child nodes of the context node.

Parameters:: node - the node. Will not be null.
Returns:: a possibly empty array of objects. Will not be null.

nameOf

java.lang.String nameOf(java.lang.Object node)

Return the 'name' of the node.

Parameters:: node -
Returns:: the 'name' of the node, of null if the node has no name.