jd.xml.xpath.expr.misc
Class ProxyExpression

java.lang.Object
  jd.xml.xpath.expr.ExpressionImpl
      jd.xml.xpath.expr.misc.ProxyExpression

All Implemented Interfaces:

Expression

Direct Known Subclasses:

ParenthesisExpression, TraceExpression

public abstract class ProxyExpression

extends ExpressionImpl

ProxyExpression wraps another expression.

Field Summary

protected Expression

expr_

Fields inherited from interface jd.xml.xpath.expr.Expression

DEP_CONTEXT_NODE, DEP_CONTEXT_POSITION, DEP_CONTEXT_SIZE, DEP_CONTEXT_STATIC, DEP_NONE, DEP_UNKNOWN

Constructor Summary

ProxyExpression(Expression expr)

Method Summary

void	accept(ExpressionVisitor visitor) Accept a ExpressionVisitor.
int	getContextDependencies() Return a bitfield indicating the expression dependencies on the XPath context.
Expression	getExpression()
int	getResultType() Return the type of the result object, before any conversions to the desired result type are performed.
boolean	isUniqueFilter() Test if this expression only matches one node when used as a predicate filter for a node-set.
boolean	matchesFilter(XPathContext context) Evaluate the expression and return if the context node matches the expression when used as predicate filter.
boolean	toBooleanValue(XPathContext context) Evaluate the Expression to a boolean.
double	toNumberValue(XPathContext context) Evaluate the Expression to a number.
String	toStringValue(XPathContext context) Evaluate the Expression to a String.
XObject	toXObject(XPathContext context) Evaluate the expression to a XObject.

Methods inherited from class jd.xml.xpath.expr.ExpressionImpl

hasContextDependencies, toNode, toNodeSet, toString

Methods inherited from class java.lang.Object

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

Field Detail

expr_

protected Expression expr_

Constructor Detail

ProxyExpression

public ProxyExpression(Expression expr)

Method Detail

getExpression

public Expression getExpression()

toXObject

public XObject toXObject(XPathContext context)

Description copied from interface: Expression

Evaluate the expression to a XObject.

Parameters:

context - the evaluation context

toNumberValue

public double toNumberValue(XPathContext context)

Description copied from interface: Expression

Evaluate the Expression to a number.

Parameters:

context - the evaluation context

toStringValue

public String toStringValue(XPathContext context)

Description copied from interface: Expression

Evaluate the Expression to a String.

Parameters:

context - the evaluation context

toBooleanValue

public boolean toBooleanValue(XPathContext context)

Description copied from interface: Expression

Evaluate the Expression to a boolean.

Parameters:

context - the evaluation context

getResultType

public int getResultType()

Description copied from interface: Expression

Return the type of the result object, before any conversions to the desired result type are performed. If the result type is not known XObject.TYPE_VARIABLE is returned.

matchesFilter

public boolean matchesFilter(XPathContext context)

Description copied from class: ExpressionImpl

Evaluate the expression and return if the context node matches the expression when used as predicate filter.

Specified by:

matchesFilter in interface Expression

Overrides:

matchesFilter in class ExpressionImpl

isUniqueFilter

public boolean isUniqueFilter()

Description copied from class: ExpressionImpl

Test if this expression only matches one node when used as a predicate filter for a node-set. The default implementation returns true if the result type is NUMBER.

Specified by:

isUniqueFilter in interface Expression

Overrides:

isUniqueFilter in class ExpressionImpl

getContextDependencies

public int getContextDependencies()

Description copied from interface: Expression

Return a bitfield indicating the expression dependencies on the XPath context.

accept

public void accept(ExpressionVisitor visitor)

Description copied from interface: Expression

Accept a ExpressionVisitor.