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java.lang.Objectcom.icl.saxon.expr.Expression
com.icl.saxon.expr.NodeSetExpression
com.icl.saxon.expr.SingletonExpression
com.icl.saxon.expr.RootExpression
An expression whose value is always a set of nodes containing a single node, the document root.
| Field Summary |
| Fields inherited from class com.icl.saxon.expr.Expression |
staticContext |
| Constructor Summary | |
RootExpression()
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|
| Method Summary | |
void |
display(int level)
Diagnostic print of expression structure |
boolean |
evaluateAsBoolean(Context context)
Evaluate as a boolean. |
java.lang.String |
evaluateAsString(Context context)
Evaluate as a string |
int |
getDependencies()
Determine which aspects of the context the expression depends on. |
NodeInfo |
getNode(Context context)
Return the first element selected by this Expression |
Expression |
reduce(int dependencies,
Context context)
Perform a partial evaluation of the expression, by eliminating specified dependencies on the context. |
Expression |
simplify()
Simplify an expression |
| Methods inherited from class com.icl.saxon.expr.SingletonExpression |
enumerate, evaluateAsNodeSet, isContextDocumentNodeSet, selectFirst |
| Methods inherited from class com.icl.saxon.expr.NodeSetExpression |
evaluate, getDataType, outputStringValue |
| Methods inherited from class com.icl.saxon.expr.Expression |
containsReferences, evaluateAsNumber, getStaticContext, indent, make, setStaticContext, usesCurrent |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
public RootExpression()
| Method Detail |
public Expression simplify()
throws XPathException
simplify in class ExpressionXPathException
public NodeInfo getNode(Context context)
throws XPathException
getNode in class SingletonExpressioncontext - The evaluation context
XPathException
public java.lang.String evaluateAsString(Context context)
throws XPathException
evaluateAsString in class SingletonExpressioncontext - The context for evaluation
XPathException
public boolean evaluateAsBoolean(Context context)
throws XPathException
evaluateAsBoolean in class SingletonExpressioncontext - The context (not used)
XPathExceptionpublic int getDependencies()
getDependencies in class Expression
public Expression reduce(int dependencies,
Context context)
throws XPathException
reduce in class Expressiondependencies - The dependencies to be removedcontext - The context to be used for the partial evaluation
XPathExceptionpublic void display(int level)
display in class Expression
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