oracle.odi.mapping.generation

Class Expression

java.lang.Object

oracle.odi.mapping.generation.AbstractSyntaxTree

oracle.odi.mapping.generation.Expression

All Implemented Interfaces:

ISelectItem

Direct Known Subclasses:

ArrayExpression, StringExpression

public abstract class Expression
extends AbstractSyntaxTree
implements ISelectItem

A class representing the expressions used within the mapping code generator AST tree.

Nested Class Summary

Nested classes/interfaces inherited from class oracle.odi.mapping.generation.AbstractSyntaxTree

AbstractSyntaxTree.LogCounter

Field Summary

Fields

Modifier and Type	Field and Description
static java.util.logging.Logger	JAVA_LOGGER

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object obj)
java.util.List	getAccompanyingExpressions() Get all accompanying expressions.
java.lang.String	getDefaultValueTemplate() Gets the default value template of this expression.
MapAttribute	getMapAttribute() Get the map attribute that is associated with this select item, if any, else null.
IMappingObject	getMappingObject()
int	getMaxColumnLength() Get the max length of the column name.
MapAttributeWithPath	getRefAttributeWithPath() Gets the referenced attribute object with the path information for this expression.
IExpressionReferencedObject	getRefObject() Get the reference object.
MapPathSpecifier	getRefPath() Gets the reference path for this expression.
java.lang.String	getTargetColumnName() Get a target column name that corresponds to this query select item, for the case where the query is owned by a DML statement object.
java.lang.String	getTemplate() Gets the template of this expression.
abstract java.lang.String	getText() Get the text for this expression.
java.lang.String	getType() Get the class type of this object.
boolean	hasCorrelatedSubquery() Returns true if this expression contains a correlated subquery.
int	hashCode()
boolean	hasWindowFunction(ITechnology techno) Indicates whether this expression references a window function.
boolean	isAggregation(ITechnology techno) Indicates whether this expression references an aggregation function.
boolean	isAggregation(ITechnology techno, oracle.odi.mapping.generation.Expression.AggregationFunctionType type) Returns true if this expression is an aggregate or window function.
boolean	isPassive()
abstract boolean	isSimpleExpression() Return true if the expression is a simple reference to exactly one referenced source object or attribute, with no function calls or operators.

Methods inherited from class oracle.odi.mapping.generation.AbstractSyntaxTree

getChildren, getCodeGenerationTemplate, getCodeGenerationTemplateName, getCustomTemplate, getExpressions, getKMName, getLeafLevelChildren, getMapPhysicalNode, getOrder, getParentAST, getParentOfType, getPropertyValue, getSourceLanguage, getSourceLocation, getSourceTechnology, getSourceText, getTargetLanguage, getTargetLocation, getTargetTechnology, getTargetText, getTemplateSubstitutionMap, hasCustomTemplate, hasSourceAndTargetText, isLeafLevelNode, isPushFromSource

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface oracle.odi.mapping.generation.ISelectItem

getArrayExpression, getCorrelatedQuery, getQuery, getSourceAttributes, getSourceExpressions, getStringExpression, getText

Field Detail

JAVA_LOGGER

public static final java.util.logging.Logger JAVA_LOGGER

Method Detail

getTemplate

public java.lang.String getTemplate()

Gets the template of this expression.

Returns:

The expression template.

getDefaultValueTemplate

public java.lang.String getDefaultValueTemplate()

Gets the default value template of this expression.

Returns:

The expression default value template.

isPassive

public boolean isPassive()

Returns:

True if this expression is a passive expression. A passive expression represents a constant column value, which can be combined with an existing row definition without any join.

getRefObject

public IExpressionReferencedObject getRefObject()

Get the reference object.

Specified by:

getRefObject in interface ISelectItem

getRefPath

public MapPathSpecifier getRefPath()

Gets the reference path for this expression.

Specified by:

getRefPath in interface ISelectItem

Returns:

The reference path.

getMaxColumnLength

public int getMaxColumnLength()

Get the max length of the column name.

Specified by:

getMaxColumnLength in interface ISelectItem

isSimpleExpression

public abstract boolean isSimpleExpression()

Return true if the expression is a simple reference to exactly one referenced source object or attribute, with no function calls or operators. So for example, the expression "EMP.EMPNO" is simple. But expressions like "SUM(EMP.SAL)" or "EMP.SAL + EMP.BONUS" are not simple.

Returns:

True if this is a simple expression.

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

hasWindowFunction

public boolean hasWindowFunction(ITechnology techno)

Indicates whether this expression references a window function. It checks all function calls against the list of aggregation functions for the given technology. If an aggregation is found, an additional check is made to determine if the "over" clause is present, indicating a window function.

Specified by:

hasWindowFunction in interface ISelectItem

Parameters:

techno - technology to use for finding the list of aggregation functions

Returns:

true if a window function is referenced, otherwise false.

isAggregation

public boolean isAggregation(ITechnology techno)

Indicates whether this expression references an aggregation function. It checks all function calls against the list of aggregation functions for the given technology.

Specified by:

isAggregation in interface ISelectItem

Parameters:

techno - technology to use for finding the list of aggregation functions

Returns:

true if an aggregation function is referenced, otherwise false.

isAggregation

public boolean isAggregation(ITechnology techno,
                             oracle.odi.mapping.generation.Expression.AggregationFunctionType type)

Returns true if this expression is an aggregate or window function. It will be checked against the technology supported aggregate function list.

Parameters:

techno - The Technology this expression belongs to.

type - type of aggregation to check for: AggregationFunctionType.AGGREGATION or AggregationFunctionType.WINDOW

Returns:

True if this is an aggregate or window function, otherwise false.

getText

public abstract java.lang.String getText()

Get the text for this expression.

Overrides:

getText in class AbstractSyntaxTree

Returns:

The generated text.

getAccompanyingExpressions

public java.util.List getAccompanyingExpressions()

Get all accompanying expressions.

Returns:

List of accompanying expressions.

hasCorrelatedSubquery

public boolean hasCorrelatedSubquery()

Returns true if this expression contains a correlated subquery.

Specified by:

hasCorrelatedSubquery in interface ISelectItem

Returns:

True if correlated subquery exists, false otherwise.

getTargetColumnName

public java.lang.String getTargetColumnName()

Get a target column name that corresponds to this query select item, for the case where the query is owned by a DML statement object.

Specified by:

getTargetColumnName in interface ISelectItem

getRefAttributeWithPath

public MapAttributeWithPath getRefAttributeWithPath()

Gets the referenced attribute object with the path information for this expression.

Specified by:

getRefAttributeWithPath in interface ISelectItem

Returns:

Reference attribute with path.

getType

public java.lang.String getType()

Get the class type of this object.

Specified by:

getType in class AbstractSyntaxTree

Returns:

A simple class type name for this object.

getMappingObject

public IMappingObject getMappingObject()

Specified by:

getMappingObject in interface ISelectItem

Returns:

The mapping object that was used to create this expression. It will be either a MapExpression, MapPhysicalExpression, or MapAttribute object.

getMapAttribute

public MapAttribute getMapAttribute()
                             throws AdapterException,
                                    MappingException

Description copied from interface: ISelectItem

Get the map attribute that is associated with this select item, if any, else null.

Specified by:

getMapAttribute in interface ISelectItem

Returns:

the MapAttribute object that generated this expression, if any, else null.

Throws:

MappingException

AdapterException