Package mondrian.olap.fun

Class FunDefBase

java.lang.Object

org.eigenbase.xom.XMLUtil

org.eigenbase.xom.XOMUtil

mondrian.olap.Util

mondrian.olap.fun.FunUtil

mondrian.olap.fun.FunDefBase

All Implemented Interfaces:

FunDef

Direct Known Subclasses:

AbstractAggregateFunDef, CachedExistsFunDef, CacheFunDef, CalculatedChildFunDef, CastFunDef, CoalesceEmptyFunDef, CrossJoinFunDef, ExistingFunDef, HierarchyCurrentMemberFunDef, HierarchyDimensionFunDef, IifFunDef, JavaFunDef, LevelHierarchyFunDef, LevelMembersFunDef, LinReg, MemberHierarchyFunDef, MemberLevelFunDef, MemberOrderKeyFunDef, NamedSetCurrentFunDef, NamedSetCurrentOrdinalFunDef, NativizeSetFunDef, ParameterFunDef, ParenthesesFunDef, RankFunDef, SetFunDef, TupleFunDef, ValidMeasureFunDef, VisualTotalsFunDef

public abstract class FunDefBase
extends FunUtil
implements FunDef

FunDefBase is the default implementation of FunDef.

Signatures

A function is defined by the following:

Parameter	Meaning	Example
name	Name of the function	"Members"
signature	Signature of the function	"<Dimension>.Members"
description	Description of the function	"Returns the set of all members in a dimension."
flags	Encoding of the syntactic type, return type, and parameter types of this operator. The encoding is described below.	"pxd"

The flags field is an string which encodes the syntactic type, return type, and parameter types of this operator.

• The first character determines the syntactic type, as described by FunUtil.decodeSyntacticType(String).
• The second character determines the return type, as described by FunUtil.decodeReturnCategory(String).
• The third and subsequence characters determine the types of the arguments arguments, as described by FunUtil.decodeParameterCategories(String).

For example, "pxd" means "an operator with property syntax (p) which returns a set (x) and takes a dimension (d) as its argument".

The arguments are always read from left to right, regardless of the syntactic type of the operator. For example, the "<Set>.Item(<Index>)" operator (signature "mmxn") has the syntax of a method-call, and takes two parameters: a set (x) and a numeric (n).

Since:

26 February, 2002

Author:

jhyde

Nested Class Summary

Nested classes/interfaces inherited from class mondrian.olap.fun.FunUtil

FunUtil.DescendingValueComparator

Nested classes/interfaces inherited from class mondrian.olap.Util

Util.AbstractFlatList<T>, Util.ByteMatcher, Util.ErrorCellValue, Util.Flat2List<T>, Util.Flat3List<T>, Util.Functor1<RT,PT>, Util.GcIterator<T>, Util.MemoryInfo, Util.PropertyList, Util.SqlNullSafeComparator

Field Summary

Fields

Modifier and Type	Field	Description
protected int	flags
protected int[]	parameterCategories
protected int	returnCategory

Fields inherited from class mondrian.olap.fun.FunUtil

BooleanNull, DoubleEmpty, DoubleNull, IntegerNull, NullMember

Fields inherited from class mondrian.olap.Util

DEBUG, EmptyValue, IBM_JVM, JdbcVersion, JVM_INSTANCE_UUID, nl, nullValue, Retrowoven

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	FunDefBase(String name, String description, String flags)	Creates an operator.
protected	FunDefBase(String name, String signature, String description, String flags)	Creates an operator with an explicit signature.

Method Summary

Modifier and Type	Method	Description
Calc	compileCall(ResolvedFunCall call, ExpCompiler compiler)	Converts a call to this function into executable objects.
Exp	createCall(Validator validator, Exp[] args)	Creates an expression which represents a call to this function with a given set of arguments.
String	getDescription()	Returns the description of this function.
String	getName()	Returns the name of this function.
int[]	getParameterCategories()	Returns the types of the arguments of this function.
Type	getResultType(Validator validator, Exp[] args)	Returns the type of a call to this function with a given set of arguments.
int	getReturnCategory()	Returns the Category code of the value returned by this function.
String	getSignature()	Returns an English description of the signature of the function, for example "<Numeric Expression> / <Numeric Expression>".
Syntax	getSyntax()	Returns the syntactic type of the function.
void	unparse(Exp[] args, PrintWriter pw)	Converts a function call into MDX source code.
protected Exp	validateArg(Validator validator, Exp[] args, int i, int category)	Validates an argument to a call to this function.

Methods inherited from class mondrian.olap.fun.FunUtil

avg, box, box, checkIterListResultStyles, checkListResultStyles, compareHierarchically, compareSiblingMembers, compareValues, compareValues, count, decodeCategory, decodeParameterCategories, decodeReturnCategory, decodeSyntacticType, getDimensionDefaultHierarchy, getNonEmptyMemberChildren, getNonEmptyMemberChildrenWithDetails, isAncestorOf, makeNullTuple, max, min, newEvalException, newEvalException, newEvalException, quartile, resolveFunArgs, sum, sumDouble, sumDouble, tupleContainsNullMember, tupleContainsNullMember, worthCaching

Methods inherited from class mondrian.olap.Util

addAppender, addDatabaseTime, addLevelCalculatedMembers, append, appendArrays, areOccurencesEqual, assertPostcondition, assertPostcondition, assertPrecondition, assertPrecondition, assertTrue, assertTrue, badValue, binarySearch, bitSetBetween, camelToUpper, canCast, cancelStatement, caseSensitiveCompareName, cast, cast, castToIterable, checkCJResultLimit, close, commaList, compare, compareIntegers, compareKey, compareName, compileScript, convert, convert, convertOlap4jConnectStringToNativeMondrian, convertStackToString, copyOf, copyOf, copyOf, copyOf, copyOf, createExpr, createRandom, createRootRole, createSimpleValidator, createUdf, dbTimeMillis, deprecated, deprecated, digestMd5, digestSha256, equal, equalName, equals, equals, explain, falseFunctor, filter, flatList, flatList, flatListCopy, generateUuidString, genericArray, getAnnotation, getClosestResource, getDimensionCube, getErrorMessage, getErrorMessage, getExecutorService, getFirstDescendantOnLevel, getMatchingCause, getMemberOrdinalInParent, getMemoryInfo, getScheduledExecutorService, hash, hash, hashArray, identityFunctor, implode, intersect, isBlank, isEmpty, isNull, isSorted, isValidProperty, last, lookup, lookup, lookup, lookup, lookup, lookupCompound, lookupCompound, lookupHierarchyLevel, lookupHierarchyRootMember, lookupHierarchyRootMember, lookupProperty, makeAppender, makeBigDecimalFromDouble, makeFqName, makeFqName, makeFqName, matches, matches, mdxEncodeString, needToImplement, newElementNotFoundException, newError, newError, newIdentityHashSet, newIdentityHashSetFake, newInternal, newInternal, newTimer, nonDbTimeMillis, normalizeName, only, parseCommaList, parseConnectString, parseIdentifier, parseInterval, parseLocale, printMemory, printMemory, quoteForMdx, quoteForMdx, quoteJavaString, quoteMdxIdentifier, quoteMdxIdentifier, quoteMdxIdentifier, quoteMdxIdentifier, quotePattern, readFully, readFully, readURL, readURL, readURL, readVirtualFile, readVirtualFileAsString, removeAppender, replace, replace, replaceProperties, safeGet, setLevel, singleQuoteString, singleQuoteString, sort, sort, threadLocalRemove, toMap, toNullValuesMap, toOlap4j, toOlap4j, toOlap4j, toURL, trueFunctor, unexpected, uniquify, unparse, unparse, wildcardToRegexp

Methods inherited from class org.eigenbase.xom.XOMUtil

addChild, addChild, addChildren, addElement, concatenate, createDefaultParser, discard, discard, discard, discard, discard, discard, discard, discard, discard, getFirstInstance, wrapperToXml

Methods inherited from class org.eigenbase.xom.XMLUtil

getFirstTagName, printAtt, printAtt, printAtt, printAtt, printPCDATA, printPCDATA, printPCDATA, quoteAtt, quoteAtt, quoteAtt, quoteAtt, quotePCDATA, stringEncodeXML, stringHasXMLSpecials

Methods inherited from class java.lang.Object

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

Field Detail

flags

protected final int flags

returnCategory

protected final int returnCategory

parameterCategories

protected final int[] parameterCategories

Constructor Detail

FunDefBase

protected FunDefBase(String name,
                     String description,
                     String flags)

Creates an operator.

Parameters:

name - Name of the function, for example "Members".

description - Description of the function, for example "Returns the set of all members in a dimension."

flags - Encoding of the syntactic type, return type, and parameter types of this operator. The "Members" operator has a syntactic type "pxd" which means "an operator with property syntax (p) which returns a set (x) and takes a dimension (d) as its argument". See FunUtil.decodeSyntacticType(String), FunUtil.decodeReturnCategory(String), FunUtil.decodeParameterCategories(String).

FunDefBase

protected FunDefBase(String name,
                     String signature,
                     String description,
                     String flags)

Creates an operator with an explicit signature.

In most cases, the signature can be generated automatically, and you should use the constructor which creates an implicit signature, FunDefBase(String, String, String, String) instead.

Parameters:

name - Name of the function, for example "Members".

signature - Signature of the function, for example "<Dimension>.Members".

description - Description of the function, for example "Returns the set of all members in a dimension."

flags - Encoding of the syntactic type, return type, and parameter types of this operator. The "Members" operator has a syntactic type "pxd" which means "an operator with property syntax (p) which returns a set (x) and takes a dimension (d) as its argument". See FunUtil.decodeSyntacticType(String), FunUtil.decodeReturnCategory(String), FunUtil.decodeParameterCategories(String).

Method Detail

getName

public String getName()

Description copied from interface: FunDef

Returns the name of this function.

Specified by:

getName in interface FunDef

getDescription

public String getDescription()

Description copied from interface: FunDef

Returns the description of this function.

Specified by:

getDescription in interface FunDef

getSyntax

public Syntax getSyntax()

Description copied from interface: FunDef

Returns the syntactic type of the function.

Specified by:

getSyntax in interface FunDef

getReturnCategory

public int getReturnCategory()

Description copied from interface: FunDef

Returns the Category code of the value returned by this function.

Specified by:

getReturnCategory in interface FunDef

getParameterCategories

public int[] getParameterCategories()

Description copied from interface: FunDef

Returns the types of the arguments of this function. Values are the same as those returned by Exp.getCategory(). The 0^th argument of methods and properties are the object they are applied to. Infix operators have two arguments, and prefix operators have one argument.

Specified by:

getParameterCategories in interface FunDef

createCall

public Exp createCall(Validator validator,
                      Exp[] args)

Description copied from interface: FunDef

Creates an expression which represents a call to this function with a given set of arguments. The result is usually a ResolvedFunCall but not always.

Specified by:

createCall in interface FunDef

validateArg

protected Exp validateArg(Validator validator,
                          Exp[] args,
                          int i,
                          int category)

Validates an argument to a call to this function.

The default implementation of this method adds an implicit conversion to the correct type. Derived classes may override.

Parameters:

validator - Validator

args - Arguments to this function

i - Ordinal of argument

category - Expected category of argument

Returns:

Validated argument

getResultType

public Type getResultType(Validator validator,
                          Exp[] args)

Returns the type of a call to this function with a given set of arguments.

The default implementation makes the coarse assumption that the return type is in some way related to the type of the first argument. Operators whose arguments don't follow the requirements of this implementation should override this method.

If the function definition says it returns a literal type (numeric, string, symbol) then it's a fair guess that the function call returns the same kind of value.

If the function definition says it returns an object type (cube, dimension, hierarchy, level, member) then we check the first argument of the function. Suppose that the function definition says that it returns a hierarchy, and the first argument of the function happens to be a member. Then it's reasonable to assume that this function returns a member.

Parameters:

validator - Validator

args - Arguments to the call to this operator

Returns:

result type of a call this function

compileCall

public Calc compileCall(ResolvedFunCall call,
                        ExpCompiler compiler)

Description copied from interface: FunDef

Converts a call to this function into executable objects.

The result must implement the appropriate interface for the result type. For example, a function which returns an integer must return an object which implements IntegerCalc.

Specified by:

compileCall in interface FunDef

getSignature

public String getSignature()

Description copied from interface: FunDef

Returns an English description of the signature of the function, for example "<Numeric Expression> / <Numeric Expression>".

Specified by:

getSignature in interface FunDef

unparse

public void unparse(Exp[] args,
                    PrintWriter pw)

Description copied from interface: FunDef

Converts a function call into MDX source code.

Specified by:

unparse in interface FunDef