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java.lang.Objectnet.sf.saxon.expr.Expression
net.sf.saxon.expr.FunctionCall
net.sf.saxon.functions.SystemFunction
net.sf.saxon.functions.Aggregate
public abstract class Aggregate
This abstract class provides functionality common to the sum(), avg(), count(), exists(), and empty() functions. These all take a sequence as input and produce a singleton as output; and they are all independent of the ordering of the items in the input.
| Field Summary |
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| Fields inherited from class net.sf.saxon.functions.SystemFunction |
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operation |
| Fields inherited from class net.sf.saxon.expr.FunctionCall |
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argument |
| Fields inherited from class net.sf.saxon.expr.Expression |
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EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, WATCH_METHOD |
| Constructor Summary | |
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Aggregate()
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| Method Summary | |
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void |
checkArguments(ExpressionVisitor visitor)
Static analysis: prevent sorting of the argument |
| Methods inherited from class net.sf.saxon.functions.SystemFunction |
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addContextDocumentArgument, addDocToPathMap, computeCardinality, computeSpecialProperties, copy, equals, getDetails, getErrorCodeForTypeErrors, getImplementationMethod, getItemType, getOperation, getRequiredType, makeSystemFunction, optimize, setDetails, useContextItemAsDefault |
| Methods inherited from class net.sf.saxon.expr.FunctionCall |
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addExternalFunctionCallToPathMap, checkArgumentCount, explain, getArguments, getDisplayName, getExpressionName, getFunctionName, getNumberOfArguments, hashCode, iterateSubExpressions, preEvaluate, promote, replaceSubExpression, setArguments, setFunctionName, simplify, simplifyArguments, toString, typeCheck |
| Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
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public Aggregate()
| Method Detail |
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public void checkArguments(ExpressionVisitor visitor)
throws XPathException
checkArguments in class SystemFunctionvisitor - the expression visitor
XPathException - if the arguments are incorrect
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