org.apache.cayenne.dba.postgres

Class PostgresQualifierTranslator

java.lang.Object

org.apache.cayenne.access.translator.select.QueryAssemblerHelper

org.apache.cayenne.access.translator.select.QualifierTranslator

org.apache.cayenne.access.translator.select.TrimmingQualifierTranslator

org.apache.cayenne.dba.postgres.PostgresQualifierTranslator

All Implemented Interfaces:

TraversalHandler

public class PostgresQualifierTranslator
extends TrimmingQualifierTranslator

Uses Postgres extensions to optimize various translations.

Since:

1.1

Field Summary

Fields inherited from class org.apache.cayenne.access.translator.select.TrimmingQualifierTranslator

trimFunction

Fields inherited from class org.apache.cayenne.access.translator.select.QualifierTranslator

caseInsensitive, matchingObject, objectMatchTranslator, qualifier, useAliasForExpressions, waitingForEndNode

Fields inherited from class org.apache.cayenne.access.translator.select.QueryAssemblerHelper

out, queryAssembler, strategy

Constructor Summary

Constructors

Constructor and Description
PostgresQualifierTranslator(QueryAssembler queryAssembler)

Method Summary

Modifier and Type	Method and Description
protected void	appendExtractFunction(ASTExtract functionExpression) Special case for extract date/time parts functions as they have many variants
protected void	appendFunction(ASTFunctionCall functionExpression) Append function name to result SQL Override this method to rename or skip function if generic name isn't supported on target DB.
protected void	appendFunctionArgDivider(ASTFunctionCall functionExpression) Append divider between function arguments.
protected void	clearLastFunctionArgDivider(ASTFunctionCall functionExpression) Clear last divider as we currently don't now position of argument until parent element is ended.
void	endNode(Expression node, Expression parentNode) Called during the traversal after an expression node children processing is finished.
void	finishedChild(Expression node, int childIndex, boolean hasMoreChildren) Called during traversal after a child of expression has been visited.
protected boolean	parenthesisNeeded(Expression node, Expression parentNode)
void	startNode(Expression node, Expression parentNode) Called during the traversal before an expression node children processing is started.

Methods inherited from class org.apache.cayenne.access.translator.select.TrimmingQualifierTranslator

getTrimFunction, processColumn, processColumnWithQuoteSqlIdentifiers, setTrimFunction

Methods inherited from class org.apache.cayenne.access.translator.select.QualifierTranslator

appendFunctionArg, appendLiteral, appendObjectMatch, detectObjectMatch, doAppendPart, doAppendPart, extractQualifier, objectNode, operandForBitwiseAnd, operandForBitwiseLeftShift, operandForBitwiseNot, operandForBitwiseOr, operandForBitwiseRightShift, operandForBitwiseXor, processRelTermination, setCaseInsensitive, setQualifier, setUseAliasForExpressions

Methods inherited from class org.apache.cayenne.access.translator.select.QueryAssemblerHelper

appendDbPath, appendLikeEscapeCharacter, appendLiteralDirect, appendObjPath, appendPart, getDbEntity, getObjEntity, paramsDbType, processRelTermination, setForceJoinForRelations

Methods inherited from class java.lang.Object

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

Constructor Detail

PostgresQualifierTranslator

public PostgresQualifierTranslator(QueryAssembler queryAssembler)

Method Detail

startNode

public void startNode(Expression node,
                      Expression parentNode)

Description copied from interface: TraversalHandler

Called during the traversal before an expression node children processing is started.

Specified by:

startNode in interface TraversalHandler

Overrides:

startNode in class QualifierTranslator

endNode

public void endNode(Expression node,
                    Expression parentNode)

Description copied from interface: TraversalHandler

Called during the traversal after an expression node children processing is finished.

Specified by:

endNode in interface TraversalHandler

Overrides:

endNode in class QualifierTranslator

finishedChild

public void finishedChild(Expression node,
                          int childIndex,
                          boolean hasMoreChildren)

Description copied from interface: TraversalHandler

Called during traversal after a child of expression has been visited.

Specified by:

finishedChild in interface TraversalHandler

Overrides:

finishedChild in class QualifierTranslator

appendFunction

protected void appendFunction(ASTFunctionCall functionExpression)

Description copied from class: QualifierTranslator

Append function name to result SQL Override this method to rename or skip function if generic name isn't supported on target DB.

Overrides:

appendFunction in class QualifierTranslator

Since:

4.0

appendFunctionArgDivider

protected void appendFunctionArgDivider(ASTFunctionCall functionExpression)

Description copied from class: QualifierTranslator

Append divider between function arguments. In overriding methods can be replaced e.g. for " || " for CONCAT operation

Overrides:

appendFunctionArgDivider in class QualifierTranslator

Since:

4.0

clearLastFunctionArgDivider

protected void clearLastFunctionArgDivider(ASTFunctionCall functionExpression)

Description copied from class: QualifierTranslator

Clear last divider as we currently don't now position of argument until parent element is ended.

Overrides:

clearLastFunctionArgDivider in class QualifierTranslator

Since:

4.0

parenthesisNeeded

protected boolean parenthesisNeeded(Expression node,
                                    Expression parentNode)

Overrides:

parenthesisNeeded in class QualifierTranslator

appendExtractFunction

protected void appendExtractFunction(ASTExtract functionExpression)

Description copied from class: QualifierTranslator

Special case for extract date/time parts functions as they have many variants

Overrides:

appendExtractFunction in class QualifierTranslator