org.apache.poi.ss.formula.functions

Class LookupUtils.CompareResult

java.lang.Object

org.apache.poi.ss.formula.functions.LookupUtils.CompareResult

Enclosing class:

LookupUtils

public static final class LookupUtils.CompareResult
extends Object

Enumeration to support 4 valued comparison results.

Excel lookup functions have complex behaviour in the case where the lookup array has mixed types, and/or is unordered. Contrary to suggestions in some Excel documentation, there does not appear to be a universal ordering across types. The binary search algorithm used changes behaviour when the evaluated 'mid' value has a different type to the lookup value.

A simple int might have done the same job, but there is risk in confusion with the well known Comparable.compareTo() and Comparator.compare() which both use a ubiquitous 3 value result encoding.

Field Summary

Fields

Modifier and Type	Field and Description
static LookupUtils.CompareResult	EQUAL
static LookupUtils.CompareResult	GREATER_THAN
static LookupUtils.CompareResult	LESS_THAN
static LookupUtils.CompareResult	TYPE_MISMATCH

Method Summary

Modifier and Type	Method and Description
boolean	isEqual()
boolean	isGreaterThan()
boolean	isLessThan()
boolean	isTypeMismatch()
String	toString()
static LookupUtils.CompareResult	valueOf(boolean matches)
static LookupUtils.CompareResult	valueOf(int simpleCompareResult)

Methods inherited from class java.lang.Object

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

Field Detail

TYPE_MISMATCH

public static final LookupUtils.CompareResult TYPE_MISMATCH

LESS_THAN

public static final LookupUtils.CompareResult LESS_THAN

EQUAL

public static final LookupUtils.CompareResult EQUAL

GREATER_THAN

public static final LookupUtils.CompareResult GREATER_THAN

Method Detail

valueOf

public static LookupUtils.CompareResult valueOf(int simpleCompareResult)

valueOf

public static LookupUtils.CompareResult valueOf(boolean matches)

isTypeMismatch

public boolean isTypeMismatch()

isLessThan

public boolean isLessThan()

isEqual

public boolean isEqual()

isGreaterThan

public boolean isGreaterThan()

toString

public String toString()

Overrides:

toString in class Object