com.novell.xml.xpath
Class ComparisonExpr

java.lang.Object
  com.novell.xml.xpath.BinaryExpr
      com.novell.xml.xpath.BooleanExpr
          com.novell.xml.xpath.ComparisonExpr

All Implemented Interfaces:

Expression

Direct Known Subclasses:

EqualsExpr, GreaterThanEqualsExpr, GreaterThanExpr, LessThanEqualsExpr, LessThanExpr, NotEqualsExpr

public abstract class ComparisonExpr

extends BooleanExpr

implements Expression

Base class for EqualityExpr and RelationalExpr implementations

Field Summary

Fields inherited from class com.novell.xml.xpath.BinaryExpr

lhs, rhs

Constructor Summary

protected

ComparisonExpr(Expression lhs, Expression rhs)

Method Summary

protected boolean	compareBooleans(boolean lhs, boolean rhs, int compare) Compare two booleans according to XPath rules for RelationalExpr and EqualityExpr
protected boolean	compareNodeSetAndNumber(NodeSet lhs, double rhs, int compare) Compare a node-set and a number according to XPath rules for RelationalExpr and EqualityExpr
protected boolean	compareNodeSetAndString(NodeSet lhs, String rhs, int compare) Compare a node-set and a string according to XPath rules for RelationalExpr and EqualityExpr
protected boolean	compareNodeSets(NodeSet lhs, NodeSet rhs, int compare) Compare two node sets according to XPath rules for RelationalExpr and EqualityExpr
protected boolean	compareNumbers(double lhs, double rhs, int compare) Compare two numbers according to XPath rules for RelationalExpr and EqualityExpr
protected boolean	compareOperands(ExpressionValue lhs, ExpressionValue rhs, int compare) Compare two operandsaccording to XPath rules for RelationalExpr and EqualityExpr
protected boolean	compareStrings(String lhs, String rhs, int compare) Compare two strings according to XPath rules for RelationalExpr and EqualityExpr

Methods inherited from class com.novell.xml.xpath.BooleanExpr

getResultType

Methods inherited from class com.novell.xml.xpath.BinaryExpr

dump, isConstant, registerForReset

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.novell.xml.xpath.Expression

dump, evaluate, getResultType, isConstant, registerForReset

Constructor Detail

ComparisonExpr

protected ComparisonExpr(Expression lhs,
                         Expression rhs)

Method Detail

compareOperands

protected boolean compareOperands(ExpressionValue lhs,
                                  ExpressionValue rhs,
                                  int compare)
                           throws XPathEvaluationException

Compare two operandsaccording to XPath rules for RelationalExpr and EqualityExpr

Parameters:

lhs - The left-hand operand

rhs - The right-hand operand

compare - The desired comparison to find: -3 lhs not equal to rhs '!=' -2 lhs less than rhs '<' -1 lhs less than or equals to rhs '<=' 0 lhs equal to rhs '=' 1 lhs greater than or equal to rhs '>' 2 lhs greater than rhs '>=' 3 lhs not equal to rhs '!='

Returns:

true if and only if there is a node from the lhs and a node from the rhs that satisfy the passed relationship

Throws:

XPathEvaluationException

compareNodeSets

protected boolean compareNodeSets(NodeSet lhs,
                                  NodeSet rhs,
                                  int compare)

Compare two node sets according to XPath rules for RelationalExpr and EqualityExpr

Parameters:

lhs - The left-hand operand

rhs - The right-hand operand

compare - The desired comparison to find: -2 lhs lexically less than rhs -1 lhs lexically less than or equals to rhs 0 lhs lexically equal to rhs 1 lhs lexically greater than or equal to rhs 2 lhs lexically greater than rhs

Returns:

true if and only if there is a node from the lhs and a node from the rhs that satisfy the passed relationship

compareNodeSetAndString

protected boolean compareNodeSetAndString(NodeSet lhs,
                                          String rhs,
                                          int compare)

Compare a node-set and a string according to XPath rules for RelationalExpr and EqualityExpr

Parameters:

lhs - The left-hand operand node-set

rhs - The right-hand operand string

compare - The desired comparison to find: -2 lhs lexically less than rhs -1 lhs lexically less than or equals to rhs 0 lhs lexically equal to rhs 1 lhs lexically greater than or equal to rhs 2 lhs lexically greater than rhs

Returns:

true if and only if there is a node from the lhs that satisfies the passed relationship

compareNodeSetAndNumber

protected boolean compareNodeSetAndNumber(NodeSet lhs,
                                          double rhs,
                                          int compare)

Compare a node-set and a number according to XPath rules for RelationalExpr and EqualityExpr

Parameters:

lhs - The left-hand operand node-set

rhs - The right-hand operand number

compare - The desired comparison to find: -2 lhs numerically less than rhs -1 lhs numerically less than or equals to rhs 0 lhs numerically equal to rhs 1 lhs numerically greater than or equal to rhs 2 lhs numerically greater than rhs

Returns:

true if and only if there is a node from the lhs that satisfies the passed relationship

compareBooleans

protected boolean compareBooleans(boolean lhs,
                                  boolean rhs,
                                  int compare)

Compare two booleans according to XPath rules for RelationalExpr and EqualityExpr

Parameters:

lhs - The left-hand operand

rhs - The right-hand operand

compare - The desired comparison to find: -3 lhs numerically not equal to rhs -2 lhs numerically less than rhs -1 lhs numerically less than or equals to rhs 0 lhs numerically equal to rhs 1 lhs numerically greater than or equal to rhs 2 lhs numerically greater than rhs 3 lhs numerically not equal to rhs

Returns:

true if and only if there is a node from the lhs that satisfies the passed relationship

compareNumbers

protected boolean compareNumbers(double lhs,
                                 double rhs,
                                 int compare)

Compare two numbers according to XPath rules for RelationalExpr and EqualityExpr

Parameters:

lhs - The left-hand operand

rhs - The right-hand operand

compare - The desired comparison to find: -3 lhs numerically not equal to rhs -2 lhs numerically less than rhs -1 lhs numerically less than or equals to rhs 0 lhs numerically equal to rhs 1 lhs numerically greater than or equal to rhs 2 lhs numerically greater than rhs 3 lhs numerically not equal to rhs

Returns:

true if and only if there is a node from the lhs that satisfies the passed relationship

compareStrings

protected boolean compareStrings(String lhs,
                                 String rhs,
                                 int compare)

Compare two strings according to XPath rules for RelationalExpr and EqualityExpr

Parameters:

lhs - The left-hand operand

rhs - The right-hand operand

compare - The desired comparison to find: -3 lhs numerically not equal to rhs -2 lhs numerically less than rhs -1 lhs numerically less than or equals to rhs 0 lhs numerically equal to rhs 1 lhs numerically greater than or equal to rhs 2 lhs numerically greater than rhs 3 lhs numerically not equal to rhs

Returns:

true if and only if there is a node from the lhs that satisfies the passed relationship