Package org.javarosa.xpath.expr

Class XPathCmpExpr

java.lang.Object

org.javarosa.xpath.expr.XPathExpression

org.javarosa.xpath.expr.XPathOpExpr

org.javarosa.xpath.expr.XPathBinaryOpExpr

org.javarosa.xpath.expr.XPathCmpExpr

All Implemented Interfaces:

Serializable, Externalizable

public class XPathCmpExpr
extends XPathBinaryOpExpr

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static int	GT
static int	GTE
static int	LT
static int	LTE
int	op

Fields inherited from class org.javarosa.xpath.expr.XPathBinaryOpExpr

a, b

Constructor Summary

Constructors

Constructor	Description
XPathCmpExpr()
XPathCmpExpr(int op, XPathExpression a, XPathExpression b)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
Object	eval(DataInstance model, EvaluationContext evalContext)
Object	pivot(DataInstance model, EvaluationContext evalContext, List<Object> pivots, Object sentinal)	Pivot this expression, returning values if appropriate, and adding any pivots to the list.
void	readExternal(DataInputStream in, PrototypeFactory pf)
String	toString()
void	writeExternal(DataOutputStream out)

Methods inherited from class org.javarosa.xpath.expr.XPathBinaryOpExpr

toString

Methods inherited from class org.javarosa.xpath.expr.XPathExpression

eval, hashCode, pivot, print, printParseTree

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

LT

public static final int LT

See Also:

Constant Field Values

GT

public static final int GT

See Also:

Constant Field Values

LTE

public static final int LTE

See Also:

Constant Field Values

GTE

public static final int GTE

See Also:

Constant Field Values

op

public int op

Constructor Details

XPathCmpExpr

public XPathCmpExpr()

XPathCmpExpr

public XPathCmpExpr(int op, XPathExpression a, XPathExpression b)

Method Details

eval

public Object eval(DataInstance model, EvaluationContext evalContext)

Specified by:

eval in class XPathExpression

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class XPathBinaryOpExpr

readExternal

public void readExternal(DataInputStream in, PrototypeFactory pf) throws IOException, DeserializationException

Specified by:

readExternal in interface Externalizable

Overrides:

readExternal in class XPathBinaryOpExpr

Throws:

IOException

DeserializationException

writeExternal

public void writeExternal(DataOutputStream out) throws IOException

Specified by:

writeExternal in interface Externalizable

Overrides:

writeExternal in class XPathBinaryOpExpr

Throws:

IOException

pivot

public Object pivot(DataInstance model, EvaluationContext evalContext, List<Object> pivots, Object sentinal) throws UnpivotableExpressionException

Description copied from class: XPathExpression

Pivot this expression, returning values if appropriate, and adding any pivots to the list.

Overrides:

pivot in class XPathBinaryOpExpr

Parameters:

model - The model to evaluate the current expression against

evalContext - The evaluation context to evaluate against

pivots - The list of pivot points in the xpath being evaluated. Pivots should be added to this list.

sentinal - The value which is being pivoted around.

Returns:

null - If a pivot was identified in this expression sentinal - If the current expression represents the sentinal being pivoted any other value - The result of the expression if no pivots are detected

Throws:

UnpivotableExpressionException - If the expression is too complex to pivot