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package oracle.toplink.essentials.internal.parsing;
import oracle.toplink.essentials.queryframework.*;
import oracle.toplink.essentials.expressions.*;
/**
* INTERNAL:
* This node contains the information about what kind of query is represented it's tree
* (e.g. Select, Update etc.)
* Subclasses of this node will contain query specific behavior.
*/
public abstract class QueryNode extends MajorNode {
private ParseTree parseTree;
public QueryNode() {
super();
}
/**
* INTERNAL
* Returns a DatabaseQuery instance according to the kind of the query the
* owning ParseTree represents: SELECT, UPDATE or DELETE.
*/
public abstract DatabaseQuery createDatabaseQuery(ParseTreeContext context);
/**
* INTERNAL
* Apply this node to the passed query
*/
public abstract void applyToQuery(DatabaseQuery theQuery, GenerationContext context);
/**
* INTERNAL
* Return a TopLink expression generated using the left node
*/
public abstract Expression generateExpression(GenerationContext context);
/**
* Compute the Reference class for this query
* @param context
* @return the class this query is querying for
*/
public Class getReferenceClass(GenerationContext genContext) {
return resolveClass(genContext);
}
public boolean isSelectNode() {
return false;
}
public boolean isUpdateNode() {
return false;
}
public boolean isDeleteNode() {
return false;
}
/**
* Return the class represented in this node.
*/
public abstract Class resolveClass(GenerationContext context);
/**
* Set the parseTree
*/
public void setParseTree(ParseTree parseTree) {
this.parseTree = parseTree;
}
/** */
public ParseTree getParseTree() {
return parseTree;
}
}