Class UnionExpr
- java.lang.Object
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- org.exolab.adaptx.xpath.expressions.UnionExpr
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- All Implemented Interfaces:
MatchExpression
,XPathExpression
public abstract class UnionExpr extends java.lang.Object implements XPathExpression, MatchExpression
An abstract class that represents an XPath Union expressionUnionExpr ::= PathExpr | (PathExpr '|' UnionExpr)
- Version:
- $Revision: 3734 $ $Date: 2003-05-13 09:55:04 +0200 (Tue, 13 May 2003) $
- Author:
- Keith Visco
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Field Summary
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Fields inherited from interface org.exolab.adaptx.xpath.XPathExpression
BOOLEAN, ERROR, FILTER_EXPR, LOCATION_PATH, NODE_TEST, NUMBER, PATH_EXPR, PRIMARY, STEP, STRING, UNION_EXPR
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Constructor Summary
Constructors Constructor Description UnionExpr()
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description short
getExprType()
Returns the type of Expr this Expr representsPathExpr
getMatchingExpr(XPathNode node, XPathContext context)
Retrieves the PathExpr that matches the given node.abstract PathExpr
getPathExpr()
Returns the PathExpr of this UnionExpr.abstract UnionExpr
getUnionExpr()
Returns the UnionExpr that this UnionExpr is in union with.abstract boolean
matches(XPathNode node, XPathContext context)
Determines if the given node is matched by this MatchExpr with respect to the given context.-
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface org.exolab.adaptx.xpath.XPathExpression
evaluate, toString
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Method Detail
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getPathExpr
public abstract PathExpr getPathExpr()
Returns the PathExpr of this UnionExpr. A UnionExpr is defined by XPath 1.0 as:UnionExpr ::= PathExpr | (PathExpr '|' UnionExpr)
- Returns:
- the PathExpr of this UnionExpr.
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getUnionExpr
public abstract UnionExpr getUnionExpr()
Returns the UnionExpr that this UnionExpr is in union with. A UnionExpr is defined by XPath 1.0 as:UnionExpr ::= PathExpr | (PathExpr '|' UnionExpr)
- Returns:
- the UnionExpr that this UnionExpr is in union with, or null if this is UnionExpr only contains a PathExpr.
- See Also:
getPathExpr()
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getExprType
public final short getExprType()
Returns the type of Expr this Expr represents- Specified by:
getExprType
in interfaceXPathExpression
- Returns:
- the type of Expr this Expr represents
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getMatchingExpr
public PathExpr getMatchingExpr(XPathNode node, XPathContext context) throws XPathException
Retrieves the PathExpr that matches the given node. If more than one PathExpr matches the given node, the most specific PathExpr will be returned.- Parameters:
node
- the node to test for matching- Returns:
- the matching PathExpr or null if none match
- Throws:
XPathException
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matches
public abstract boolean matches(XPathNode node, XPathContext context) throws XPathException
Determines if the given node is matched by this MatchExpr with respect to the given context.- Specified by:
matches
in interfaceMatchExpression
- Parameters:
node
- the node to determine a match forcontext
- the XPathContext- Returns:
- true if the given node is matched by this MatchExpr
- Throws:
XPathException
- when an error occurs during evaluation
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