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: 1.11 $ $Date: 2004/02/29 14:17:39 $

Author:

Dmitri Plotnikov

Nested Class Summary

Nested classes inherited from class org.apache.commons.jxpath.ri.compiler.Expression

Expression.PointerIterator, Expression.ValueIterator

Field Summary

private boolean	basic
private boolean	basicKnown
private Expression	expression
private Expression[]	predicates

Fields inherited from class org.apache.commons.jxpath.ri.compiler.Path

Fields inherited from class org.apache.commons.jxpath.ri.compiler.Expression

NOT_A_NUMBER, ONE, ZERO

Constructor Summary

ExpressionPath(Expression expression, Expression[] predicates, Step[] steps)

Method Summary

java.lang.Object	compute(EvalContext context)
boolean	computeContextDependent() Returns true if the root expression or any of the predicates or the path steps are context dependent.
java.lang.Object	computeValue(EvalContext context) Evaluates the expression.
protected java.lang.Object	expressionPath(EvalContext evalContext, boolean firstMatch) Walks an expression path (a path that starts with an expression)
Expression	getExpression()
Expression[]	getPredicates() Predicates are the expressions in brackets that may follow the root expression of the path.
boolean	isSimpleExpressionPath() Recognized paths formatted as $x[3]/foo[2].
java.lang.String	toString()

Methods inherited from class org.apache.commons.jxpath.ri.compiler.Path

areBasicPredicates, createContextForStep, evalSteps, getSingleNodePointerForSteps, getSteps, isSimplePath, isSimpleStep

Methods inherited from class org.apache.commons.jxpath.ri.compiler.Expression

isContextDependent, iterate, iteratePointers

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

expression

private Expression expression

predicates

private Expression[] predicates

basicKnown

private boolean basicKnown

basic

private boolean basic

Constructor Detail

ExpressionPath

public ExpressionPath(Expression expression,
                      Expression[] predicates,
                      Step[] steps)

Method Detail

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()

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)