oracle.toplink.essentials.internal.parsing.FetchJoinNode Maven / Gradle / Ivy
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package oracle.toplink.essentials.internal.parsing;
import oracle.toplink.essentials.exceptions.EJBQLException;
/**
* INTERNAL
* Purpose: Represent a FETCH JOIN declaration as part of the FROM
* clause: FETCH JOIN o.customer.
*
Responsibilities:
* - Manage the path node and the outer join flag of the FETCH JOIN clause.
*
*/
public class FetchJoinNode extends Node {
private Node path;
private boolean outerJoin;
/** */
public Node getPath() {
return path;
}
/** */
public void setPath(Node node) {
path = node;
}
/** */
public boolean isOuterJoin() {
return outerJoin;
}
/** */
public void setOuterJoin(boolean outerJoin) {
this.outerJoin = outerJoin;
}
/**
* INTERNAL
* Check the path child node for an unqualified field access and if so,
* replace it by a qualified field access.
*/
public Node qualifyAttributeAccess(ParseTreeContext context) {
if (path != null) {
path = path.qualifyAttributeAccess(context);
}
return this;
}
/**
* INTERNAL
* Validate node and calculate its type.
*/
public void validate(ParseTreeContext context) {
if (path != null) {
path.validate(context);
setType(path.getType());
// join of embedded attribute is not supported.
if (path.isDotNode()) {
TypeHelper typeHelper = context.getTypeHelper();
VariableNode left = (VariableNode)path.getLeft();
AttributeNode right = (AttributeNode)path.getRight();
if ((left != null) && (right != null)) {
if (typeHelper.isEmbeddedAttribute(left.getType(), right.getAttributeName()))
throw EJBQLException.unsupportJoinArgument(
context.getQueryInfo(), getLine(), getColumn(),
"Fetch Join", getType().toString());
}
}
}
}
}