How to use

getMatchingNodes

method

in

com.netflix.spinnaker.halyard.config.services.v1.LookupService

/**
 * Given a node filter and a node type, find all nodes that match both the filter and the type of the Node.
 * @param filter is the filter to lookup by.
 * @param clazz is the class of the node type we want to find.
 * @return the nodes matching the filter and clazz.
 */
public <T extends Node> List<T> getMatchingNodesOfType(NodeFilter filter, Class<T> clazz) {
 Halconfig halconfig = parser.getHalconfig();
 return getMatchingNodes(halconfig, filter)
   .stream()
   .filter(clazz::isInstance)
   .map(n -> (T) n)
   .collect(Collectors.toList());
}

/**
 * Given a node filter and a node type, find all nodes that match both the filter and the type of the Node.
 * @param filter is the filter to lookup by.
 * @param clazz is the class of the node type we want to find.
 * @return the nodes matching the filter and clazz.
 */
public <T extends Node> List<T> getMatchingNodesOfType(NodeFilter filter, Class<T> clazz) {
 Halconfig halconfig = parser.getHalconfig();
 return getMatchingNodes(halconfig, filter)
   .stream()
   .filter(clazz::isInstance)
   .map(n -> (T) n)
   .collect(Collectors.toList());
}

/**
 * @param node is the node whose children we want to find.
 * @param filter is the filter to lookup by.
 * @return the children of the input node matching the filter.
 */
private List<Node> getMatchingNodes(Node node, NodeFilter filter) {
 log.trace("Checking for leaf nodes of node " + node.getNodeName());
 List<Node> result = new ArrayList<>();
 NodeIterator children = node.getChildren();
 Node recurse = children.getNext(filter);
 while (recurse != null) {
  result.addAll(getMatchingNodes(recurse, filter));
  recurse = children.getNext(filter);
 }
 // If we have visited this node, it must have matched the filter.
 result.add(node);
 return result;
}

/**
 * @param node is the node whose children we want to find.
 * @param filter is the filter to lookup by.
 * @return the children of the input node matching the filter.
 */
private List<Node> getMatchingNodes(Node node, NodeFilter filter) {
 log.trace("Checking for leaf nodes of node " + node.getNodeName());
 List<Node> result = new ArrayList<>();
 NodeIterator children = node.getChildren();
 Node recurse = children.getNext(filter);
 while (recurse != null) {
  result.addAll(getMatchingNodes(recurse, filter));
  recurse = children.getNext(filter);
 }
 // If we have visited this node, it must have matched the filter.
 result.add(node);
 return result;
}