Package org.pgcodekeeper.core.database.pg.parser.expr

Class PgAbstractExprWithNmspc<T extends org.antlr.v4.runtime.ParserRuleContext>

java.lang.Object

org.pgcodekeeper.core.database.base.parser.antlr.AbstractExpr

org.pgcodekeeper.core.database.pg.parser.expr.PgAbstractExpr

org.pgcodekeeper.core.database.pg.parser.expr.PgAbstractExprWithNmspc<T>

Direct Known Subclasses:

PgAbstractStatements, PgDelete, PgFunctionExp, PgInsert, PgMerge, PgSelect, PgUpdate, PgValueExprWithNmspc

public abstract class PgAbstractExprWithNmspc<T extends org.antlr.v4.runtime.ParserRuleContext>
extends PgAbstractExpr

Abstract expression parser with namespace support for tracking variables, references, and CTEs.

Method Summary

Modifier and Type	Method	Description
void	addNamespaceVariable(Pair<String,String> variable)	Adds a "freestanding" variable (e.g. a non-table function parameter) into a special complexNamespace container.
void	addRawTableReference(ObjectReference qualifiedTable)
boolean	addReference(String alias, ObjectReference object)	Clients may use this to set up pseudo-variable names before expression analysis.
abstract List<ModPair<String,String>>	analyze(T ruleCtx)	Analyzes the given rule context.
void	declareNamespaceVar(String alias, String name, ObjectReference argType)	Declares a variable in the current namespace.
Map.Entry<String,ObjectReference>	findReference(String schema, String name, String column)

Methods inherited from class org.pgcodekeeper.core.database.pg.parser.expr.PgAbstractExpr

setFullAnalyze

Methods inherited from class org.pgcodekeeper.core.database.base.parser.antlr.AbstractExpr

addDependency, addDependency, addDependency, addReference, addVariable, getDependencies

Methods inherited from class java.lang.Object

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

Method Details

findReference

public Map.Entry<String,ObjectReference> findReference(String schema,
 String name,
 String column)

Overrides:

findReference in class AbstractExpr

Parameters:

schema - optional schema qualification of name, may be null

name - alias of the referenced object

column - optional referenced column alias, may be null

Returns:

a pair of (Alias, Dealiased name) where Alias is the given name. Dealiased name can be null if the name is internal to the query and is not a reference to external table.
null if the name is not found

declareNamespaceVar

public void declareNamespaceVar(String alias,
 String name,
 ObjectReference argType)

Declares a variable in the current namespace. Variables of relation types are declared as references, rest are treated as primitives.

Parameters:

alias - var alias (required)

name - var name (optional, may be null)

argType - var type

addNamespaceVariable

public void addNamespaceVariable(Pair<String,String> variable)

Adds a "freestanding" variable (e.g. a non-table function parameter) into a special complexNamespace container.

addReference

public boolean addReference(String alias,
 ObjectReference object)

Clients may use this to set up pseudo-variable names before expression analysis.

addRawTableReference

public void addRawTableReference(ObjectReference qualifiedTable)

analyze

public abstract List<ModPair<String,String>> analyze(T ruleCtx)

Analyzes the given rule context.

Parameters:

ruleCtx - the parser rule context to analyze

Returns:

list of modifiable pairs containing analyzed results