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Java Source Code / Java Documentation » Database DBMS » mckoi » com.mckoi.database.interpret

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Class Diagram

Java Document (Java Doc)

java.lang .Object

com.mckoi.database.interpret .TableExpressionFromSet

TableExpressionFromSet
class TableExpressionFromSet (Code)
	A set of tables and function references that make up the resources made available by a table expression. When a SelectQueriable is prepared this object is created and is used to dereference names to sources. It also has the ability to chain to another TableExpressionFromSet and resolve references over a complex sub-query hierarchy. author: Tobias Downer

Constructor Summary
public	TableExpressionFromSet(DatabaseConnection connection) Constructs the object.

Method Summary
public void	addFunctionRef(String name, Expression expression) Adds a function resource to the set.
public void	addTable(FromTableInterface table_resource) Adds a table resource to the set.
Expression	dereferenceAssignment(Variable v) Dereferences a fully qualified reference that is within this set.
public void	exposeAllColumns() Exposes all the columns in all the child tables.
public void	exposeAllColumnsFromSource(FromTableInterface table) Exposes all the columns from the given FromTableInterface.
public void	exposeAllColumnsFromSource(TableName tn) Exposes all the columns from the given table name.
public void	exposeVariable(Variable v) Adds a variable in this from set that is exposed to the outside.
ExpressionPreparer	expressionQualifier() Returns an ExpressionPreparer that qualifies all variables in an expression to either a qualified Variable or a CorrelatedVariable object.
FromTableInterface	findTable(String schema, String name) Returns the first FromTableInterface object that matches the given schema, table reference.
public Variable[]	generateResolvedVariableList() Returns a Variable[] array for each variable that is exposed in this from set.
public TableExpressionFromSet	getParent() Returns the parent of this set.
FromTableInterface	getTable(int i) Returns the FromTableInterface object at the given index position in this set.
CorrelatedVariable	globalResolveReference(int level, Variable v) Resolves the given Variable reference within the chained list of TableExpressionFromSet objects to a CorrelatedVariable.
Object	qualifyVariable(Variable v_in) Attempts to qualify the given Variable object to a value found either in this from set, or a value in the parent from set.
Variable	resolveReference(Variable v) Resolves the given Variable object to a fully resolved Variable within the context of this table expression.
Variable	resolveTableColumnReference(Variable v) Resolves the given Variable against the table columns in this from set. If the variable does not resolve to anything 'null' is returned.
public void	setCaseInsensitive(boolean status) Toggle the case sensitivity flag.
int	setCount() Returns the number of FromTableInterface objects in this set.
public void	setParent(TableExpressionFromSet parent) Sets the parent of this expression.
boolean	stringCompare(String str1, String str2)

Constructor Detail

TableExpressionFromSet
public TableExpressionFromSet(DatabaseConnection connection)(Code)
	Constructs the object.

Method Detail

addFunctionRef
public void addFunctionRef(String name, Expression expression)(Code)
	Adds a function resource to the set. Note that is possible for there to be references in the 'expression' that do not reference resources in this set. For example, a correlated reference.

addTable
public void addTable(FromTableInterface table_resource)(Code)
	Adds a table resource to the set.

dereferenceAssignment
Expression dereferenceAssignment(Variable v)(Code)
	Dereferences a fully qualified reference that is within this set. For example, SELECT ( a + b ) AS z given 'z' would return the expression (a + b). Returns null if unable to dereference assignment because it does not exist.

exposeAllColumns
public void exposeAllColumns()(Code)
	Exposes all the columns in all the child tables.

exposeAllColumnsFromSource
public void exposeAllColumnsFromSource(FromTableInterface table)(Code)
	Exposes all the columns from the given FromTableInterface.

exposeAllColumnsFromSource
public void exposeAllColumnsFromSource(TableName tn)(Code)
	Exposes all the columns from the given table name.

exposeVariable
public void exposeVariable(Variable v)(Code)
	Adds a variable in this from set that is exposed to the outside. This list should contain all references from the SELECT ... part of the query. For example, SELECT a, b, (a + 1) d exposes variables a, b and d.

expressionQualifier
ExpressionPreparer expressionQualifier()(Code)
	Returns an ExpressionPreparer that qualifies all variables in an expression to either a qualified Variable or a CorrelatedVariable object.

findTable
FromTableInterface findTable(String schema, String name)(Code)
	Returns the first FromTableInterface object that matches the given schema, table reference. Returns null if no objects with the given schema/name reference match.

generateResolvedVariableList
public Variable[] generateResolvedVariableList()(Code)
	Returns a Variable[] array for each variable that is exposed in this from set. This is a list of fully qualified variables that are referencable from the final result of the table expression.

getParent
public TableExpressionFromSet getParent()(Code)
	Returns the parent of this set. If it has no parent it returns null.

getTable
FromTableInterface getTable(int i)(Code)
	Returns the FromTableInterface object at the given index position in this set.

globalResolveReference

CorrelatedVariable globalResolveReference(int level, Variable v)(Code)

Resolves the given Variable reference within the chained list of TableExpressionFromSet objects to a CorrelatedVariable. If the reference is not found in this set the method recurses to the parent set. The first unambiguous reference is returned.

If resolution is ambiguous within a set, a StatementException is thrown.

Returns null if the reference could not be resolved.

qualifyVariable
Object qualifyVariable(Variable v_in)(Code)
	Attempts to qualify the given Variable object to a value found either in this from set, or a value in the parent from set. A variable that is qualified by the parent is called a correlated variable. Any correlated variables that are successfully qualified are returned as CorrelatedVariable objects.

resolveReference

Variable resolveReference(Variable v)(Code)

Resolves the given Variable object to a fully resolved Variable within the context of this table expression. If the variable does not resolve to anything 'null' is returned. If the variable is ambiguous, a StatementException is thrown.

If the variable name references a table column, an expression with a single Variable element is returned. If the variable name references a function, an expression of the function is returned.

Note that the given variable does not have to be fully qualified but the returned expressions are fully qualified.

resolveTableColumnReference
Variable resolveTableColumnReference(Variable v)(Code)
	Resolves the given Variable against the table columns in this from set. If the variable does not resolve to anything 'null' is returned. If the variable is ambiguous, a StatementException is thrown. Note that the given variable does not have to be fully qualified but the returned expressions are fully qualified.

setCaseInsensitive
public void setCaseInsensitive(boolean status)(Code)
	Toggle the case sensitivity flag.

setCount
int setCount()(Code)
	Returns the number of FromTableInterface objects in this set.

setParent
public void setParent(TableExpressionFromSet parent)(Code)
	Sets the parent of this expression. parent can be set to null.

stringCompare
boolean stringCompare(String str1, String str2)(Code)

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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