org.jaxen.expr
Class DefaultEqualityExpr

java.lang.Object
  org.jaxen.expr.DefaultExpr
      org.jaxen.expr.DefaultBinaryExpr
          org.jaxen.expr.DefaultTruthExpr
              org.jaxen.expr.DefaultEqualityExpr

All Implemented Interfaces:

BinaryExpr, EqualityExpr, Expr, java.io.Serializable

Direct Known Subclasses:

DefaultEqualsExpr, DefaultNotEqualsExpr

abstract class DefaultEqualityExpr

extends DefaultTruthExpr

implements EqualityExpr

Constructor Summary

(package private)

DefaultEqualityExpr(Expr lhs, Expr rhs)

Method Summary

protected boolean	bothAreBoolean(java.lang.Object lhs, java.lang.Object rhs)
protected boolean	bothAreSets(java.lang.Object lhs, java.lang.Object rhs)
protected boolean	eitherIsBoolean(java.lang.Object lhs, java.lang.Object rhs)
protected boolean	eitherIsNumber(java.lang.Object lhs, java.lang.Object rhs)
protected boolean	eitherIsSet(java.lang.Object lhs, java.lang.Object rhs)
java.lang.Object	evaluate(Context context) Evaluate the expression in the given context, and return the result.
protected abstract boolean	evaluateObjectObject(java.lang.Object lhs, java.lang.Object rhs)
private boolean	evaluateObjectObject(java.lang.Object lhs, java.lang.Object rhs, Navigator nav)
private java.lang.Boolean	evaluateSetSet(java.util.List lhsSet, java.util.List rhsSet, Navigator nav)
Expr	getLHS() Returns the left-hand side of the binary expression.
abstract java.lang.String	getOperator() Returns the operator for the binary expression such as "+" or "div".
Expr	getRHS() Returns the right-hand side of the binary expression.
java.lang.String	getText() Returns a String containing the XPath expression.
protected boolean	isSet(java.lang.Object obj)
protected boolean	setIsEmpty(java.util.List set)
void	setLHS(Expr lhs)
void	setRHS(Expr rhs)
Expr	simplify() Simplifies the XPath expression.
java.lang.String	toString()

Methods inherited from class org.jaxen.expr.DefaultExpr

convertToIterator, convertToList

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.jaxen.expr.BinaryExpr

getLHS, getOperator, getRHS

Methods inherited from interface org.jaxen.expr.Expr

getText, simplify

Constructor Detail

DefaultEqualityExpr

DefaultEqualityExpr(Expr lhs,
                    Expr rhs)

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class DefaultTruthExpr

evaluate

public java.lang.Object evaluate(Context context)
                          throws JaxenException

Description copied from interface: Expr

Evaluate the expression in the given context, and return the result. The result will be a java.lang.Double for expressions that return a number, a java.lang.String for expressions that return a string, a java.lang.Boolean for expressions that return a boolean, and a java.util.List for expressions that return a node-set. In the latter case, the elements of the list are the actual objects from the source document model. Copies are not made.

Specified by:

evaluate in interface Expr

Parameters:

context - the context in which the expression is evaluated

Returns:

an object representing the result of the evaluation

Throws:

JaxenException

evaluateSetSet

private java.lang.Boolean evaluateSetSet(java.util.List lhsSet,
                                         java.util.List rhsSet,
                                         Navigator nav)

evaluateObjectObject

private boolean evaluateObjectObject(java.lang.Object lhs,
                                     java.lang.Object rhs,
                                     Navigator nav)

evaluateObjectObject

protected abstract boolean evaluateObjectObject(java.lang.Object lhs,
                                                java.lang.Object rhs)

bothAreSets

protected boolean bothAreSets(java.lang.Object lhs,
                              java.lang.Object rhs)

eitherIsSet

protected boolean eitherIsSet(java.lang.Object lhs,
                              java.lang.Object rhs)

isSet

protected boolean isSet(java.lang.Object obj)

setIsEmpty

protected boolean setIsEmpty(java.util.List set)

eitherIsBoolean

protected boolean eitherIsBoolean(java.lang.Object lhs,
                                  java.lang.Object rhs)

bothAreBoolean

protected boolean bothAreBoolean(java.lang.Object lhs,
                                 java.lang.Object rhs)

eitherIsNumber

protected boolean eitherIsNumber(java.lang.Object lhs,
                                 java.lang.Object rhs)

getLHS

public Expr getLHS()

Description copied from interface: BinaryExpr

Returns the left-hand side of the binary expression.

Specified by:

getLHS in interface BinaryExpr

Returns:

the left hand side expression

getRHS

public Expr getRHS()

Description copied from interface: BinaryExpr

Returns the right-hand side of the binary expression.

Specified by:

getRHS in interface BinaryExpr

Returns:

the right-hand side expression

setLHS

public void setLHS(Expr lhs)

setRHS

public void setRHS(Expr rhs)

getOperator

public abstract java.lang.String getOperator()

Description copied from interface: BinaryExpr

Returns the operator for the binary expression such as "+" or "div".

Specified by:

getOperator in interface BinaryExpr

Returns:

the operator for the expression

getText

public java.lang.String getText()

Description copied from interface: Expr

Returns a String containing the XPath expression.

Specified by:

getText in interface Expr

Returns:

the text form of this XPath expression

simplify

public Expr simplify()

Description copied from interface: Expr

Simplifies the XPath expression. For example, the expression //para[1 = 1] could be simplified to //para. In practice, this is usually a noop. Jaxen does not currently perform any simplification.

Specified by:

simplify in interface Expr

Overrides:

simplify in class DefaultExpr