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(RebindingMap rebindings)
Copy an expression.
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static Expression |
distribute(java.util.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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int |
getCost()
Return the estimated cost of evaluating an expression.
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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 Expression |
preEvaluate()
Evaluate the expression statically if either or both operands are literals.
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protected java.lang.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, getStaticUType, isNegatable, listAndComponents, typeCheck
computeHashCode, computeSpecialProperties, displayOperator, equals, explainExtraAttributes, export, getImplementationMethod, getLhs, getLhsExpression, getOperator, getRhs, getRhsExpression, isAssociative, isCommutative, isInverse, operands, setFlattened, setLhsExpression, setRhsExpression, toShortString, toString
addToPathMap, adoptChildExpression, allowExtractingCommonSubexpressions, checkedOperands, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, dynamicError, evaluateAsString, evaluatePendingUpdates, explain, getCardinality, getConfiguration, getConstructType, getDependencies, getEvaluationMethod, getExtraProperty, getIntegerBounds, getInterpretedExpression, getIntrinsicDependencies, getLocalRetainedStaticContext, getLocation, getNetCost, getObjectName, getPackageData, getParentExpression, getProperties, getProperty, getRetainedStaticContext, getScopingExpression, getSlotsUsed, getSpecialProperties, getStaticBaseURI, getStaticBaseURIString, getStaticType, getStreamerName, hasCompatibleStaticContext, hashCode, hasVariableBinding, identityHashCode, implementsStaticTypeCheck, isCallOn, isCallOnSystemFunction, isIdentical, isInstruction, isLiftable, isMultiThreaded, isSameExpression, isStaticPropertiesKnown, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterate, markTailFunctionCalls, operandList, operandSparseList, optimizeChildren, process, resetLocalStaticProperties, restoreParentPointers, setEvaluationMethod, setExtraProperty, setFiltered, setLocation, setParentExpression, setRetainedStaticContext, setRetainedStaticContextLocally, setRetainedStaticContextThoroughly, setStaticProperty, simplify, simplifyChildren, staticTypeCheck, suppressValidation, toPattern, typeCheckChildren, typeError, unordered, verifyParentPointers, verifyParentPointers
public AndExpression(Expression p1, Expression p2)
p1
- the first operandp2
- the second operandprotected Expression preEvaluate()
BooleanExpression
preEvaluate
in class BooleanExpression
public 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 int getCost()
Expression
getCost
in class Expression
public Expression copy(RebindingMap rebindings)
copy
in class Expression
rebindings
- public Expression negate()
negate
in interface Negatable
negate
in class BooleanExpression
protected java.lang.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 static Expression distribute(java.util.Collection<Expression> exprs)
exprs
- the expressions to be "and'ed" togetherCopyright (c) 2004-2018 Saxonica Limited. All rights reserved.