| java.lang.Object
 net.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.PathExpression
| PathExpression | | final public class PathExpression extends ComputedExpression implements MappingFunction(Code) | | An expression that establishes a set of nodes by following relationships between nodes
in the document. Specifically, it consists of a start expression which defines a set of
nodes, and a Step which defines a relationship to be followed from those nodes to create
a new set of nodes.
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| PathExpression | | public PathExpression(Expression start, Expression step)(Code) | | Constructor
Parameters:
start - A node-set expression denoting the absolute or relative set of nodes from which thenavigation path should start.
Parameters:
step - The step to be followed from each node in the start expression to yield a newnode-set |
| computeCardinality | | public int computeCardinality()(Code) | | Determine the static cardinality of the expression
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| computeDependencies | | public int computeDependencies()(Code) | | Determine which aspects of the context the expression depends on. The result is
a bitwise-or'ed value composed from constants such as XPathContext.VARIABLES and
XPathContext.CURRENT_NODE
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| computeSpecialProperties | | public int computeSpecialProperties()(Code) | | Get the static properties of this expression (other than its type). The result is
bit-signficant. These properties are used for optimizations. In general, if
property bit is set, it is true, but if it is unset, the value is unknown.
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| equals | | public boolean equals(Object other)(Code) | | Is this expression the same as another expression?
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| getFirstStep | | public Expression getFirstStep()(Code) | | Get the first step in this expression. A path expression A/B/C is represented as (A/B)/C, but
the first step is A
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| getItemType | | final public ItemType getItemType(TypeHierarchy th)(Code) | | Determine the data type of the items returned by this exprssion
the type of the step
Parameters:
th - |
| getLastStep | | public Expression getLastStep()(Code) | | Get the last step of the path expression
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| getLeadingSteps | | public Expression getLeadingSteps()(Code) | | Get a path expression consisting of all steps except the last
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| getRemainingSteps | | public Expression getRemainingSteps()(Code) | | Get all steps after the first.
This is complicated by the fact that A/B/C is represented as ((A/B)/C; we are required
to return B/C
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| getStartExpression | | public Expression getStartExpression()(Code) | | Get the start expression (the left-hand operand)
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| getStepExpression | | public Expression getStepExpression()(Code) | | Get the step expression (the right-hand operand)
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| hashCode | | public int hashCode()(Code) | | get HashCode for comparing two expressions
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| isAbsolute | | public boolean isAbsolute(TypeHierarchy th)(Code) | | Test whether a path expression is an absolute path - that is, a path whose first step selects a
document node
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| iterateSubExpressions | | public Iterator iterateSubExpressions()(Code) | | Get the immediate subexpressions of this expression
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