org.exolab.castor.jdo.oql
Class ParseTreeWalker
java.lang.Object
org.exolab.castor.jdo.oql.ParseTreeWalker
- TokenTypes
public class ParseTreeWalker
extends java.lang.Object
A class which walks the parse tree created by the parser to check for errors
and translate to SQL.
Version:
- Nissim Karpenstein
ARROW , BOOLEAN_LITERAL , CHAR_LITERAL , COLON , COMMA , CONCAT , DATE_LITERAL , DIVIDE , DOLLAR , DOT , DOUBLE_LITERAL , END_OF_QUERY , EQUAL , GT , GTE , IDENTIFIER , KEYWORD_ABS , KEYWORD_AND , KEYWORD_AS , KEYWORD_ASC , KEYWORD_AVG , KEYWORD_BETWEEN , KEYWORD_BY , KEYWORD_COUNT , KEYWORD_DESC , KEYWORD_DISTINCT , KEYWORD_FROM , KEYWORD_IN , KEYWORD_IS_DEFINED , KEYWORD_IS_UNDEFINED , KEYWORD_LIKE , KEYWORD_LIMIT , KEYWORD_LIST , KEYWORD_MAX , KEYWORD_MIN , KEYWORD_MOD , KEYWORD_NIL , KEYWORD_NOT , KEYWORD_OR , KEYWORD_ORDER , KEYWORD_SELECT , KEYWORD_SUM , KEYWORD_UNDEFINED , KEYWORD_WHERE , LONG_LITERAL , LPAREN , LT , LTE , MINUS , NOT_EQUAL , PLUS , RPAREN , STRING_LITERAL , TIMES , TIMESTAMP_LITERAL , TIME_LITERAL |
AGGREGATE
public static final int AGGREGATE
- 1
DEPENDANT_OBJECT
public static final int DEPENDANT_OBJECT
- 4
DEPENDANT_OBJECT_VALUE
public static final int DEPENDANT_OBJECT_VALUE
- 5
DEPENDANT_VALUE
public static final int DEPENDANT_VALUE
- 6
FUNCTION
public static final int FUNCTION
- 2
MAX_TABLE_LENGTH
public static final int MAX_TABLE_LENGTH
- 30
PARENT_OBJECT
public static final int PARENT_OBJECT
- 3
ParseTreeWalker
public ParseTreeWalker(LockEngine dbEngine,
ParseTreeNode parseTree,
ClassLoader classLoader)
throws QueryException
Creates a new parse tree walker. Which checks the tree for errors, and
generates a QueryExpression containing the SQL translation.
dbEngine
- The Persistence EngineparseTree
- The parse tree to walk
QueryException
- Thrown by checkErrors.
buildTableAlias
public String buildTableAlias(String tableName,
Vector path,
int tableIndex)
Builds the alias name for a table from the path info.
tableName
- The name of the table to add to the select clause
getClassDescriptor
public JDOClassDescriptor getClassDescriptor()
Accessor method for _clsDesc.
- The _clsDesc member.
getObjClass
public Class getObjClass()
Accessor method for _objClass.
- The _objClass member.
getParamInfo
public Hashtable getParamInfo()
Accessor method for _paramInfo.
- The _paramInfo member.
getPathInfo
public Vector getPathInfo()
Method to get path info for the selected object. This is the path which
will be used by the QueryResults to follow the path if the object
selected is a DEPENDANT_OBJECT or DEPENDANT_OBJECT_VALUE. Any other
projectionTypes do not need this, so null will be returned.
getProjectionType
public int getProjectionType()
Accessor method for _projectionType.
- The _projectionType member.
getQueryExpression
public QueryExpression getQueryExpression()
Accessor method for private _queryExpr member.
- private _queryExpr member
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