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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.BinaryExpression
net.sf.saxon.expr.GeneralComparison10
GeneralComparison10: a boolean expression that compares two expressions for equals, not-equals, greater-than or less-than. This implements the operators =, !=, <, >, etc. This version of the class implements general comparisons in XPath 1.0 backwards compatibility mode, as defined in the Oct 2004 revision of the specifications.
| Field Summary | |
protected AtomicComparer |
comparer
|
protected int |
singletonOperator
|
| Fields inherited from class net.sf.saxon.expr.BinaryExpression |
operand0, operand1, 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 | |
GeneralComparison10(Expression p0,
int op,
Expression p1)
Create a general comparison identifying the two operands and the operator |
|
| Method Summary | |
protected static boolean |
compare(AtomicValue a0,
int operator,
AtomicValue a1,
AtomicComparer comparer,
XPathContext context)
Compare two atomic values |
int |
computeCardinality()
Determine the static cardinality. |
protected java.lang.String |
displayOperator()
|
boolean |
effectiveBooleanValue(XPathContext context)
Evaluate the expression in a boolean context |
Item |
evaluateItem(XPathContext context)
Evaluate the expression in a given context |
ItemType |
getItemType(TypeHierarchy th)
Determine the data type of the expression |
Expression |
optimize(Optimizer opt,
StaticContext env,
ItemType contextItemType)
Optimize the expression |
Expression |
typeCheck(StaticContext env,
ItemType contextItemType)
Type-check the expression |
| Methods inherited from class net.sf.saxon.expr.BinaryExpression |
computeSpecialProperties, display, equals, getOperands, getOperator, hashCode, isAssociative, isCommutative, isInverse, iterateSubExpressions, promote, replaceSubExpression, simplify |
| Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
protected int singletonOperator
protected AtomicComparer comparer
| Constructor Detail |
public GeneralComparison10(Expression p0,
int op,
Expression p1)
p0 - the left-hand operandop - the operator, as a token returned by the Tokenizer (e.g. Token.LT)p1 - the right-hand operand| Method Detail |
public int computeCardinality()
computeCardinality in class BinaryExpression
public Expression typeCheck(StaticContext env,
ItemType contextItemType)
throws XPathException
typeCheck in interface ExpressiontypeCheck in class BinaryExpressionXPathException
public Expression optimize(Optimizer opt,
StaticContext env,
ItemType contextItemType)
throws XPathException
optimize in interface Expressionoptimize in class BinaryExpressionopt - the optimizer in use. This provides access to supporting functions; it also allows
different optimization strategies to be used in different circumstances.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 Item evaluateItem(XPathContext context)
throws XPathException
evaluateItem in interface ExpressionevaluateItem in class ComputedExpressioncontext - the given context for evaluation
XPathException - if any dynamic error occurs evaluating the
expression
public boolean effectiveBooleanValue(XPathContext context)
throws XPathException
effectiveBooleanValue in interface ExpressioneffectiveBooleanValue in class ComputedExpressioncontext - the given context for evaluation
XPathException - if any dynamic error occurs evaluating the
expression
protected static boolean compare(AtomicValue a0,
int operator,
AtomicValue a1,
AtomicComparer comparer,
XPathContext context)
throws XPathException
XPathExceptionpublic ItemType getItemType(TypeHierarchy th)
th -
protected java.lang.String displayOperator()
displayOperator in class BinaryExpression
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