oracle.toplink.essentials.internal.parsing.SetNode Maven / Gradle / Ivy
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package oracle.toplink.essentials.internal.parsing;
import oracle.toplink.essentials.expressions.*;
import oracle.toplink.essentials.queryframework.*;
import java.util.*;
/**
* INTERNAL:
* This node holds a list of all the updates that will occur in an Update Query.
* Slightly differnt from other nodes since holds more than two children in a list.
*/
public class SetNode extends MajorNode {
private List assignmentNodes = null;
public SetNode() {
super();
assignmentNodes = new Vector();
}
/**
* Iterate through the updates in this query and build expressions for them. Set the
* built expressions on the query.
*/
public void addUpdatesToQuery(UpdateAllQuery theQuery, GenerationContext context) {
Iterator iterator = assignmentNodes.iterator();
while (iterator.hasNext()) {
EqualsAssignmentNode node = (EqualsAssignmentNode)iterator.next();
Expression leftExpression = getExpressionForNode(node.getLeft(), theQuery.getReferenceClass(), context);
Expression rightExpression = getExpressionForNode(node.getRight(), theQuery.getReferenceClass(), context);
theQuery.addUpdate(leftExpression, rightExpression);
}
}
/**
* INTERNAL
* Check the update item node for a path expression starting with a
* unqualified field access and if so, replace it by a qualified field
* access.
*/
public Node qualifyAttributeAccess(ParseTreeContext context) {
for (Iterator i = assignmentNodes.iterator(); i.hasNext(); ) {
Node item = (Node)i.next();
item.qualifyAttributeAccess(context);
}
return this;
}
/**
* INTERNAL
* Validate node.
*/
public void validate(ParseTreeContext context) {
for (Iterator i = assignmentNodes.iterator(); i.hasNext(); ) {
Node item = (Node)i.next();
item.validate(context);
}
}
/**
* Create an expression to represent one of the nodes on a SetToNode.
* We will assume that set_to nodes change elements that are direct mappings on the reference
* class of the query.
*/
protected Expression getExpressionForNode(Node node, Class referenceClass, GenerationContext context) {
Expression expression = null;
if (node.isAttributeNode()) {
// look up a preexisting expression based on the reference class of the query.
String classVariable = context.getParseTreeContext().getVariableNameForClass(referenceClass, context);
expression = context.expressionFor(classVariable);
if (expression == null) {
expression = new ExpressionBuilder();
context.addExpression(expression, classVariable);
}
expression = node.addToExpression(expression, context);
} else {
expression = node.generateExpression(context);
}
return expression;
}
/**
* INTERNAL
*/
public void setAssignmentNodes(List nodes) {
assignmentNodes = nodes;
}
}