org.apache.commons.jxpath.ri.compiler
Class ExpressionPath
java.lang.Object
|
+--org.apache.commons.jxpath.ri.compiler.Expression
|
+--org.apache.commons.jxpath.ri.compiler.Path
|
+--org.apache.commons.jxpath.ri.compiler.ExpressionPath
- public class ExpressionPath
- extends Path
An element of the parse tree that represents an expression path, which is
a path that starts with an expression like a function call: getFoo(.)/bar
.
- Version:
- $Revision: 1.4 $ $Date: 2002/05/08 00:39:59 $
- Author:
- Dmitri Plotnikov
Fields inherited from class org.apache.commons.jxpath.ri.compiler.Expression |
NaN, ONE, OP_AND, OP_CONSTANT, OP_CORE_FUNCTION, OP_DIV, OP_EQ, OP_EXPRESSION_PATH, OP_FUNCTION, OP_GT, OP_GTE, OP_KEY_LOOKUP, OP_LOCATION_PATH, OP_LT, OP_LTE, OP_MINUS, OP_MOD, OP_MULT, OP_NE, OP_OR, OP_STEP, OP_SUM, OP_UNARY_MINUS, OP_UNION, OP_VAR, ZERO |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
BASIC_PREDICATES_HINT
public static final java.lang.String BASIC_PREDICATES_HINT
- See Also:
- Constant Field Values
ExpressionPath
public ExpressionPath(Expression expression,
Expression[] predicates,
Step[] steps)
getExpression
public Expression getExpression()
getPredicates
public Expression[] getPredicates()
- Predicates are the expressions in brackets that may follow
the root expression of the path.
computeContextDependent
public boolean computeContextDependent()
- Returns true if the root expression or any of the
predicates or the path steps are context dependent.
- Overrides:
computeContextDependent
in class Path
isSimpleExpressionPath
public boolean isSimpleExpressionPath()
- Recognized paths formatted as
$x[3]/foo[2]
. The
evaluation of such "simple" paths is optimized and streamlined.
toString
public java.lang.String toString()
- Overrides:
toString
in class Expression
compute
public java.lang.Object compute(EvalContext context)
- Specified by:
compute
in class Expression
computeValue
public java.lang.Object computeValue(EvalContext context)
- Description copied from class:
Expression
- Evaluates the expression. If the result is a node set, returns
the first element of the node set.
- Specified by:
computeValue
in class Expression
expressionPath
protected java.lang.Object expressionPath(EvalContext evalContext,
boolean firstMatch)
- Walks an expression path (a path that starts with an expression)
Copyright (c) 2001 - Apache Software Foundation