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package oracle.toplink.essentials.internal.parsing;
// Java imports
import java.util.Hashtable;
import java.util.Set;
// TopLink imports
import oracle.toplink.essentials.internal.sessions.AbstractSession;
import oracle.toplink.essentials.expressions.Expression;
import oracle.toplink.essentials.expressions.ExpressionBuilder;
/**
* INTERNAL
* Purpose: Maintain the generation context for an EJBQL query
*
Responsibilities:
* - Maintain a table of expression builders and alias's
*
- Maintain the base query class
*
- Maintain a handle to the session
*
- Maintain a handle to the parse tree
*
* @author Jon Driscoll and Joel Lucuik
* @since TopLink 4.0
*/
public class GenerationContext {
protected AbstractSession session;
protected ParseTreeContext parseTreeContext;
protected Class baseQueryClass;
protected Expression baseExpression;
protected Hashtable expressions;
protected ParseTree parseTree;
protected boolean isNotIndicatedInMemberOf = false;
//If a NOT MEMBER OF is encountered, we need to store the MEMBER OF
//so that the right side of the member of can use the stored expression
//from the left
protected MemberOfNode memberOfNode = null;
public GenerationContext() {
super();
expressions = new Hashtable();
}
public GenerationContext(ParseTreeContext newContext, AbstractSession newSession, ParseTree newParseTree) {
super();
parseTreeContext = newContext;
session = newSession;
expressions = new Hashtable();
parseTree = newParseTree;
}
public void addExpression(Expression expression, String aliasName) {
expressions.put(aliasName, expression);
}
public Expression expressionFor(String aliasName) {
return (Expression)expressions.get(aliasName);
}
public Class getBaseQueryClass() {
return baseQueryClass;
}
public ParseTreeContext getParseTreeContext() {
return parseTreeContext;
}
public ParseTree getParseTree() {
return parseTree;
}
public AbstractSession getSession() {
return session;
}
public void setBaseQueryClass(java.lang.Class newBaseQueryClass) {
baseQueryClass = newBaseQueryClass;
}
/**
* Caches the specified expression under the variable name for the base
* query class.
*/
public void setBaseExpression(String variable, Expression expr) {
// Store the expression for faster access
baseExpression = expr;
// Store it into the cache
addExpression(expr, variable);
}
/** */
public Expression getBaseExpression() {
return baseExpression;
}
public void setParseTree(ParseTree parseTree) {
this.parseTree = parseTree;
}
public void setParseTreeContext(ParseTreeContext newParseTreeContext) {
parseTreeContext = newParseTreeContext;
}
public void setSession(AbstractSession newSession) {
session = newSession;
}
//Answer true if we need to use parallel expressions
//This will be the case if a 1:1 is SELECTed in the EJBQL.
public boolean useParallelExpressions() {
return false;
}
//Answer true if we want VariableNodes to check if they're
//SELECTed first, to determine how to instantiate the ExpressionBuilder
public boolean shouldCheckSelectNodeBeforeResolving() {
return false;
}
//Set and get the contained MemberOfNode. This is for handling NOT MEMBER OF.
public void setMemberOfNode(MemberOfNode newMemberOfNode) {
memberOfNode = newMemberOfNode;
}
public MemberOfNode getMemberOfNode() {
return memberOfNode;
}
//Answer true if we have a MemberOfNode contained. This is for handling NOT MEMBER OF
public boolean hasMemberOfNode() {
return memberOfNode != null;
}
//Answer true if we should use outer joins in our get() (vs getAllowingNull())
public boolean shouldUseOuterJoins() {
return false;
}
/** */
public Expression joinVariables(Set variables) {
return null;
}
}