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Summary: Nested | Field | Method | Constr | Detail: Nested | Field | Method | Constr |
java.lang.Object
com.icl.saxon.expr.Expression
com.icl.saxon.expr.NodeSetExpression
com.icl.saxon.expr.SingletonExpression
com.icl.saxon.expr.RootExpression
public class RootExpression
extends SingletonExpression
Field Summary |
Fields inherited from class com.icl.saxon.expr.Expression | |
staticContext |
Method Summary | |
void |
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boolean |
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String |
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int |
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NodeInfo | |
Expression | |
Expression |
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Methods inherited from class com.icl.saxon.expr.SingletonExpression | |
enumerate , evaluateAsBoolean , evaluateAsNodeSet , evaluateAsString , getNode , isContextDocumentNodeSet , selectFirst |
Methods inherited from class com.icl.saxon.expr.NodeSetExpression | |
enumerate , evaluate , evaluateAsBoolean , evaluateAsNodeSet , evaluateAsString , getDataType , outputStringValue , selectFirst |
Methods inherited from class com.icl.saxon.expr.Expression | |
containsReferences , display , enumerate , evaluate , evaluateAsBoolean , evaluateAsNodeSet , evaluateAsNumber , evaluateAsString , getDataType , getDependencies , getStaticContext , indent , isContextDocumentNodeSet , make , outputStringValue , reduce , setStaticContext , simplify , usesCurrent |
public void display(int level)
Diagnostic print of expression structure
- Overrides:
- display in interface Expression
public boolean evaluateAsBoolean(Context context) throws XPathException
Evaluate as a boolean.
- Overrides:
- evaluateAsBoolean in interface SingletonExpression
- Parameters:
context
- The context (not used)
- Returns:
- true (always - because the nodeset is never empty)
public String evaluateAsString(Context context) throws XPathException
Evaluate as a string
- Overrides:
- evaluateAsString in interface SingletonExpression
- Parameters:
context
- The context for evaluation
- Returns:
- The concatenation of all the character data within the document
public int getDependencies()
Determine which aspects of the context the expression depends on. The result is a bitwise-or'ed value composed from constants such as Context.VARIABLES and Context.CURRENT_NODE
- Overrides:
- getDependencies in interface Expression
public NodeInfo getNode(Context context) throws XPathException
Return the first element selected by this Expression
- Overrides:
- getNode in interface SingletonExpression
- Parameters:
context
- The evaluation context
- Returns:
- the NodeInfo of the first selected element, or null if no element is selected
public Expression reduce(int dependencies, Context context) throws XPathException
Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.
- Overrides:
- reduce in interface Expression
- Parameters:
dependencies
- The dependencies to be removedcontext
- The context to be used for the partial evaluation
- Returns:
- a new expression that does not have any of the specified dependencies
public Expression simplify() throws XPathException
Simplify an expression
- Overrides:
- simplify in interface Expression
- Returns:
- the simplified expression