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java.lang.Objectcom.icl.saxon.expr.Expression
com.icl.saxon.expr.NodeSetExpression
com.icl.saxon.expr.UnionExpression
class UnionExpression
An expression representing a nodeset that is a union of two other NodeSets
Field Summary | |
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protected Expression |
p1
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protected Expression |
p2
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Fields inherited from class com.icl.saxon.expr.Expression |
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staticContext |
Constructor Summary | |
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UnionExpression(Expression p1,
Expression p2)
Constructor |
Method Summary | |
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void |
display(int level)
Diagnostic print of expression structure |
NodeEnumeration |
enumerate(Context c,
boolean sort)
Evaluate the union expression. |
int |
getDependencies()
Determine which aspects of the context the expression depends on. |
boolean |
isContextDocumentNodeSet()
Determine, in the case of an expression whose data type is Value.NODESET, whether all the nodes in the node-set are guaranteed to come from the same document as the context node. |
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.NodeSetExpression |
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evaluate, evaluateAsBoolean, evaluateAsNodeSet, evaluateAsString, getDataType, outputStringValue, selectFirst |
Methods inherited from class com.icl.saxon.expr.Expression |
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containsReferences, evaluateAsNumber, getStaticContext, indent, make, setStaticContext, usesCurrent |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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protected Expression p1
protected Expression p2
Constructor Detail |
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public UnionExpression(Expression p1, Expression p2)
p1
- the left-hand operandp2
- the right-hand operandMethod Detail |
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public Expression simplify() throws XPathException
simplify
in class Expression
XPathException
public NodeEnumeration enumerate(Context c, boolean sort) throws XPathException
enumerate
in class NodeSetExpression
c
- The context for evaluationsort
- Request the nodes in document order (they will be, regardless)
XPathException
- when the expression does not return a nodeset.public int getDependencies()
getDependencies
in class Expression
public boolean isContextDocumentNodeSet()
isContextDocumentNodeSet
in class Expression
public Expression reduce(int dependencies, Context context) throws XPathException
reduce
in class Expression
dependencies
- The dependencies to be removedcontext
- The context to be used for the partial evaluation
XPathException
public void display(int level)
display
in class Expression
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