package org.vertexium.cypher.functions.aggregate;
import org.vertexium.Element;
import org.vertexium.cypher.VertexiumCypherQueryContext;
import org.vertexium.cypher.VertexiumCypherScope;
import org.vertexium.cypher.ast.model.CypherAstBase;
import org.vertexium.cypher.exceptions.VertexiumCypherTypeErrorException;
import org.vertexium.cypher.executor.ExpressionScope;
import java.util.List;
import java.util.Objects;
public class CountFunction extends AggregationFunction {
@Override
public Object invoke(VertexiumCypherQueryContext ctx, CypherAstBase[] arguments, ExpressionScope scope) {
assertArgumentCount(arguments, 1);
Object arg0 = ctx.getExpressionExecutor().executeExpression(ctx, arguments[0], scope);
if (arg0 instanceof String && arg0.equals("*")) {
if (scope instanceof VertexiumCypherScope) {
return ((VertexiumCypherScope) scope).stream()
.filter(Objects::nonNull)
.count();
} else if (scope instanceof VertexiumCypherScope.Item) {
return 1;
}
throw new VertexiumCypherTypeErrorException(scope, VertexiumCypherScope.class, VertexiumCypherScope.Item.class);
}
if (arg0 instanceof List) {
return ((List<?>) arg0).stream()
.filter(Objects::nonNull)
.count();
}
return 1;
}
}