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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.BinaryExpression
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[] |
operands
|
protected int |
operator
|
Fields inherited from class net.sf.saxon.expr.ComputedExpression |
lineNumber, NO_ARGUMENTS, staticProperties |
Constructor Summary | |
AppendExpression(Expression p1,
int op,
Expression p2)
Constructor |
Method Summary | |
Expression |
analyze(StaticContext env)
Type-check the expression. |
int |
computeCardinality()
Determine the static cardinality of the expression |
void |
display(int level,
NamePool pool)
Diagnostic print of expression structure |
protected String |
displayOperator()
|
boolean |
equals(Object other)
Is this expression the same as another expression? |
ItemType |
getItemType()
Determine the data type of the items returned by this expression |
Expression[] |
getSubExpressions()
Get the immediate subexpressions of 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. |
Expression |
promote(PromotionOffer offer)
Promote this expression if possible |
void |
setDetails(Expression p1,
int op,
Expression p2)
Identify the two operands and the operator (for use when the default constructor was used) |
Expression |
simplify()
Simplify the expression |
Methods inherited from class net.sf.saxon.expr.ComputedExpression |
computeDependencies, computeSpecialProperties, computeStaticProperties, dynamicError, effectiveBooleanValue, evaluateAsString, evaluateItem, getCardinality, getDependencies, getIntrinsicDependencies, getLineNumber, getSpecialProperties, markTailFunctionCalls, setLineNumber, typeError |
Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
protected Expression[] operands
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 operandMethod Detail |
public final ItemType getItemType()
public final int computeCardinality()
computeCardinality
in class BinaryExpression
public Expression simplify() throws XPathException
simplify
in interface Expression
simplify
in class BinaryExpression
XPathException
public SequenceIterator iterate(XPathContext c) throws XPathException
iterate
in interface Expression
iterate
in class ComputedExpression
c
- The context for evaluation
XPathException
- if any dynamic error occurs evaluating the
expressionpublic void setDetails(Expression p1, int op, Expression p2)
p1
- the left-hand operandop
- the operator, as a token returned by the Tokenizer (e.g. Tokenizer.AND)p2
- the right-hand operandpublic Expression analyze(StaticContext env) throws XPathException
env
- the static context of the expression
XPathException
- if an error is discovered during this phase
(typically a type error)public Expression promote(PromotionOffer offer) throws XPathException
promote
in interface Expression
promote
in class ComputedExpression
offer
- 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 Expression[] getSubExpressions()
getSubExpressions
in interface Expression
getSubExpressions
in class ComputedExpression
protected static boolean isCommutative(int operator)
public boolean equals(Object other)
public int hashCode()
public void display(int level, NamePool pool)
level
- indentation level for this expressionprotected String displayOperator()
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