public class AndExpression extends BooleanExpression
operator
EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, UPDATE_METHOD, WATCH_METHOD
Constructor and Description |
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AndExpression(Expression p1,
Expression p2)
Construct a boolean AND expression
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Modifier and Type | Method and Description |
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Expression |
copy()
Copy an expression.
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static Expression |
distribute(Collection<Expression> exprs)
Generate an 'and' tree over a set of expressions
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boolean |
effectiveBooleanValue(XPathContext c)
Evaluate as a boolean.
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ExpressionCompiler |
getExpressionCompiler()
Return the compiler of the AndExpression
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Expression |
negate()
Return the negation of this boolean expression, that is, an expression that returns true
when this expression returns false, and vice versa
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Expression |
optimize(ExpressionVisitor visitor,
ContextItemStaticInfo contextInfo)
Perform optimisation of an expression and its subexpressions.
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protected String |
tag()
Get the element name used to identify this expression in exported expression format
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computeCardinality, evaluateItem, forceToBoolean, getExpressionName, getItemType, getOperandRole, isNegatable, listAndComponents, typeCheck
computeSpecialProperties, displayOperator, equals, explainExtraAttributes, export, getImplementationMethod, getLhs, getLhsExpression, getOperator, getRhs, getRhsExpression, hashCode, isAssociative, isCommutative, isInverse, operands, setFlattened, setLhsExpression, setRhsExpression, toShortString, toString
addToPathMap, adoptChildExpression, checkedOperands, checkForUpdatingSubexpressions, checkPermittedContents, clearStreamabilityData, computeDependencies, computeStaticProperties, doPromotion, dynamicError, evaluateAsString, evaluatePendingUpdates, explain, getCardinality, getConfiguration, getConstructType, getCost, getDependencies, getEvaluationMethod, getHostLanguage, getIntegerBounds, getIntrinsicDependencies, getLocation, getNetCost, getObjectName, getPackageData, getParentExpression, getPosture, getPostureAndSweepIfKnown, getProperties, getProperty, getRetainedStaticContext, getSlotsUsed, getSpecialProperties, getStaticBaseURI, getStaticBaseURIString, getStreamability, getStreamingAdjunct, getSweep, getSystemId, hasVariableBinding, identityHashCode, implementsStaticTypeCheck, isCallOn, isCallOnSystemFunction, isIdentical, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterate, iterateEvents, makeStreamingAdjunct, markTailFunctionCalls, operandList, operandSparseList, optimizeChildren, optimizeForType, process, promote, promoteChildren, resetLocalStaticProperties, restoreParentPointers, setEvaluationMethod, setFiltered, setLocation, setParentExpression, setPostureAndSweep, setRetainedStaticContext, setRetainedStaticContextLocally, setStaticProperty, simplify, simplifyChildren, staticTypeCheck, suppressValidation, toPattern, toStreamingPattern, typeCheckChildren, typeError, unordered
public AndExpression(Expression p1, Expression p2)
p1
- the first operandp2
- the second operandpublic Expression optimize(ExpressionVisitor visitor, ContextItemStaticInfo contextInfo) throws XPathException
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.
optimize
in class BooleanExpression
visitor
- an expression visitorcontextInfo
- 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
- if an error is discovered during this phase
(typically a type error)public Expression copy()
copy
in class Expression
public Expression negate()
negate
in interface Negatable
negate
in class BooleanExpression
protected String tag()
tag
in class BinaryExpression
public boolean effectiveBooleanValue(XPathContext c) throws XPathException
effectiveBooleanValue
in class BooleanExpression
c
- The context in which the expression is to be evaluatedXPathException
- if any dynamic error occurs evaluating the
expressionpublic ExpressionCompiler getExpressionCompiler()
getExpressionCompiler
in class Expression
public static Expression distribute(Collection<Expression> exprs)
exprs
- the expressions to be "and'ed" togetherCopyright (c) 2004-2014 Saxonica Limited. All rights reserved.