/**
* Analyzes filter expression to build query graph model.
*
* @param topNode - filter top node
* @param queryGraph - model containing relationships between streams, to be written to
*/
public static void analyze(ExprNode topNode, QueryGraph queryGraph, boolean isOuterJoin) {
// Analyze relationships between streams. Relationships are properties in AND and EQUALS nodes
// of joins.
if (topNode instanceof ExprEqualsNode) {
ExprEqualsNode equalsNode = (ExprEqualsNode) topNode;
if (!equalsNode.isNotEquals()) {
analyzeEqualsNode(equalsNode, queryGraph, isOuterJoin);
}
} else if (topNode instanceof ExprAndNode) {
ExprAndNode andNode = (ExprAndNode) topNode;
analyzeAndNode(andNode, queryGraph, isOuterJoin);
} else if (topNode instanceof ExprBetweenNode) {
ExprBetweenNode betweenNode = (ExprBetweenNode) topNode;
analyzeBetweenNode(betweenNode, queryGraph);
} else if (topNode instanceof ExprRelationalOpNode) {
ExprRelationalOpNode relNode = (ExprRelationalOpNode) topNode;
analyzeRelationalOpNode(relNode, queryGraph);
} else if (topNode instanceof ExprDotNode && !isOuterJoin) {
ExprDotNode dotNode = (ExprDotNode) topNode;
analyzeDotNode(dotNode, queryGraph);
}
}
