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java.lang.Object net.sf.saxon.expr.Expression net.sf.saxon.expr.SingleNodeExpression net.sf.saxon.expr.RootExpression
public class RootExpression
An expression whose value is always a set of nodes containing a single node, the document root. This corresponds to the XPath Expression "/", including the implicit "/" at the start of a path expression with a leading "/".
Field Summary |
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Fields inherited from class net.sf.saxon.expr.Expression |
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EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, WATCH_METHOD |
Constructor Summary | |
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RootExpression()
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Method Summary | |
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PathMap.PathMapNodeSet |
addToPathMap(PathMap pathMap,
PathMap.PathMapNodeSet pathMapNodeSet)
Add a representation of this expression to a PathMap. |
int |
computeCardinality()
Specify that the expression returns a singleton |
Expression |
copy()
Copy an expression. |
boolean |
equals(Object other)
Is this expression the same as another expression? |
void |
explain(ExpressionPresenter destination)
Diagnostic print of expression structure. |
int |
getIntrinsicDependencies()
Determine which aspects of the context the expression depends on. |
ItemType |
getItemType(TypeHierarchy th)
Determine the data type of the items returned by this expression |
NodeInfo |
getNode(XPathContext context)
Return the first element selected by this Expression |
int |
hashCode()
get HashCode for comparing two expressions |
protected String |
noContextMessage()
Customize the error message on type checking |
String |
toString()
The toString() method for an expression attempts to give a representation of the expression in an XPath-like form, but there is no guarantee that the syntax will actually be true XPath. |
Methods inherited from class net.sf.saxon.expr.SingleNodeExpression |
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computeSpecialProperties, effectiveBooleanValue, evaluateItem, isContextPossiblyUndefined, iterate, optimize, typeCheck |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public RootExpression()
Method Detail |
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protected String noContextMessage()
noContextMessage
in class SingleNodeExpression
public boolean equals(Object other)
equals
in class Object
public final int computeCardinality()
computeCardinality
in class SingleNodeExpression
StaticProperty.ALLOWS_ZERO_OR_ONE
,
StaticProperty.EXACTLY_ONE
, StaticProperty.ALLOWS_ONE_OR_MORE
,
StaticProperty.ALLOWS_ZERO_OR_MORE
public ItemType getItemType(TypeHierarchy th)
getItemType
in class SingleNodeExpression
th
- the type hierarchy cache
public int hashCode()
hashCode
in class Object
public NodeInfo getNode(XPathContext context) throws XPathException
getNode
in class SingleNodeExpression
context
- The evaluation context
XPathException
public int getIntrinsicDependencies()
getIntrinsicDependencies
in class SingleNodeExpression
public Expression copy()
copy
in class Expression
public PathMap.PathMapNodeSet addToPathMap(PathMap pathMap, PathMap.PathMapNodeSet pathMapNodeSet)
addToPathMap
in class Expression
pathMap
- the PathMap to which the expression should be addedpathMapNodeSet
-
public String toString()
toString
in class Expression
public void explain(ExpressionPresenter destination)
explain
in class Expression
destination
- the expression presenter used to display the structure
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