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java.lang.Object
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+--net.sf.saxon.expr.ComputedExpression
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+--net.sf.saxon.expr.BinaryExpression
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+--net.sf.saxon.expr.AppendExpression
An expression representing a sequence that is the concatenation of two given sequences. This implements the "comma" operator in XPath sequence expressions.
| Nested Class Summary | |
static class |
AppendExpression.AppendIterator
Iterator that concatenates the results of two supplied iterators |
| Field Summary | |
protected Expression |
operand0
|
protected Expression |
operand1
|
protected int |
operator
|
| Fields inherited from class net.sf.saxon.expr.ComputedExpression |
locationId, staticProperties |
| Fields inherited from interface net.sf.saxon.expr.Expression |
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD |
| Constructor Summary | |
AppendExpression(Expression p1,
int op,
Expression p2)
Constructor |
|
| Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
Type-check the expression. |
int |
computeCardinality()
Determine the static cardinality of the expression |
void |
display(int level,
NamePool pool,
java.io.PrintStream out)
Diagnostic print of expression structure |
protected java.lang.String |
displayOperator()
|
boolean |
equals(java.lang.Object other)
Is this expression the same as another expression? |
ItemType |
getItemType()
Determine the data type of the items returned by this expression |
int |
hashCode()
get HashCode for comparing two expressions. |
protected static boolean |
isCommutative(int operator)
|
SequenceIterator |
iterate(XPathContext c)
Iterate over the value of the expression. |
java.util.Iterator |
iterateSubExpressions()
Get the immediate subexpressions of this expression |
Expression |
promote(PromotionOffer offer)
Promote this expression if possible |
Expression |
simplify(StaticContext env)
Simplify the expression |
| Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
protected Expression operand0
protected Expression operand1
protected int operator
| Constructor Detail |
public AppendExpression(Expression p1,
int op,
Expression p2)
p1 - the left-hand operandop - the operator (always ",")p2 - the right-hand operand| Method Detail |
public final ItemType getItemType()
public final int computeCardinality()
computeCardinality in class net.sf.saxon.expr.BinaryExpression
public Expression simplify(StaticContext env)
throws XPathException
simplify in interface Expressionsimplify in class net.sf.saxon.expr.BinaryExpressionXPathException
public SequenceIterator iterate(XPathContext c)
throws XPathException
iterate in interface Expressioniterate in class ComputedExpressionc - The context for evaluation
XPathException - if any dynamic error occurs evaluating the
expression
public Expression analyze(StaticContext env,
ItemType contextItemType)
throws XPathException
env - the static context of the expressioncontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPE
XPathException
public Expression promote(PromotionOffer offer)
throws XPathException
promote in interface Expressionpromote in class ComputedExpressionoffer - details of the offer, for example the offer to move
expressions that don't depend on the context to an outer level in
the containing expression
XPathException - if any error is detectedpublic java.util.Iterator iterateSubExpressions()
iterateSubExpressions in interface ExpressioniterateSubExpressions in class ComputedExpressionprotected static boolean isCommutative(int operator)
public boolean equals(java.lang.Object other)
equals in class java.lang.Objectpublic int hashCode()
hashCode in class java.lang.Object
public void display(int level,
NamePool pool,
java.io.PrintStream out)
level - indentation level for this expressionpool - NamePool used to expand any names appearing in the expressionout - Output destinationprotected java.lang.String displayOperator()
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