openjava.ptree
Class JoinExpression

java.lang.Object
  |
  +--openjava.ptree.ParseTreeObject
        |
        +--openjava.ptree.NonLeaf
              |
              +--openjava.ptree.SetExpression
                    |
                    +--openjava.ptree.JoinExpression

All Implemented Interfaces:

Cloneable, Expression, ParseTree, VariableInitializer

public class JoinExpression

extends SetExpression

JoinExpression is a pair of joined relational expressions appearing in the from clause of a QueryExpression.

Field Summary

Fields inherited from class openjava.ptree.SetExpression

Fields inherited from class openjava.ptree.NonLeaf

Fields inherited from class openjava.ptree.ParseTreeObject

debugFlag, debugLevel, LN, out, writerStack

Constructor Summary

JoinExpression(Expression left, Expression right, int joinType, Expression condition)
Constructs a JoinExpression.

Method Summary

void	accept(ParseTreeVisitor v) Accepts a ParseTreeVisitor object as the role of a Visitor in the Visitor pattern, as the role of an Element in the Visitor pattern.
OJClass	deriveRowType(Environment env)
Expression	getCondition()
int	getJoinType()
static int	getJoinTypeCode(String s) Returns ParserConstants.INNER if s is "inner", and similarly for ParserConstants.LEFT, ParserConstants.RIGHT, ParserConstants.FULL.
String	getJoinTypeName()
Expression	getLeft()
Expression	getRight()

Methods inherited from class openjava.ptree.SetExpression

flatten, flatten, getRowType, getType

Methods inherited from class openjava.ptree.NonLeaf

childrenAccept, childrenAreEqual, elementAt, equals, getComment, getContents, getLength, makeRecursiveCopy, replaceChildWith, set, set, set, set, set, set, set, set, set, setComment, setElementAt, writeCode

Methods inherited from class openjava.ptree.ParseTreeObject

clone, eq, eq, equal, flushPrintWriter, getDebugFlag, getNest, getObjectID, getParent, getPrintWriter, getTab, hashCode, lastObjectID, makeCopy, popNest, popPrintWriter, pushNest, pushPrintWriter, replace, setDebugFlag, setDebugLevel, setNest, setParent, setPrintStream, setTab, toFlattenString, toString, writeDebug, writeDebugL, writeDebugLln, writeDebugln, writeDebugLR, writeDebugR, writeDebugRln, writeTab

Methods inherited from class java.lang.Object

equals, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface openjava.ptree.ParseTree

childrenAccept, eq, equals, getObjectID, makeCopy, makeRecursiveCopy, replace, toFlattenString, toString, writeCode

Constructor Detail

JoinExpression

public JoinExpression(Expression left,
                      Expression right,
                      int joinType,
                      Expression condition)

Constructs a JoinExpression.

Parameters:

joinType - type of join; allowable values are ParserConstants.LEFT, ParserConstants.RIGHT, ParserConstants.FULL, and ParserConstants.INNER signifies an ordinary join.

Method Detail

getLeft

public Expression getLeft()

getRight

public Expression getRight()

getJoinType

public int getJoinType()

getJoinTypeName

public String getJoinTypeName()

getJoinTypeCode

public static int getJoinTypeCode(String s)

Returns ParserConstants.INNER if s is "inner", and similarly for ParserConstants.LEFT, ParserConstants.RIGHT, ParserConstants.FULL.

getCondition

public Expression getCondition()

accept

public void accept(ParseTreeVisitor v)
            throws ParseTreeException

Description copied from interface: ParseTree

Accepts a ParseTreeVisitor object as the role of a Visitor in the Visitor pattern, as the role of an Element in the Visitor pattern.

This invoke an appropriate visit() method on the accepted visitor.

Specified by:

accept in interface ParseTree

Specified by:

accept in class ParseTreeObject

Parameters:

v - a visitor

ParseTreeException

deriveRowType

public OJClass deriveRowType(Environment env)
                      throws Exception

Specified by:

deriveRowType in class SetExpression

Exception