*/
package org.opendaylight.mdsal.dom.spi.query;
-import static com.google.common.base.Preconditions.checkArgument;
-
-import com.google.common.collect.ImmutableList;
import java.util.AbstractMap.SimpleImmutableEntry;
-import java.util.ArrayDeque;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Map.Entry;
import java.util.Optional;
import org.eclipse.jdt.annotation.NonNullByDefault;
import org.opendaylight.mdsal.dom.api.query.DOMQuery;
-import org.opendaylight.mdsal.dom.api.query.DOMQueryPredicate;
+import org.opendaylight.mdsal.dom.api.query.DOMQueryResult;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
-import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
-import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
-import org.opendaylight.yangtools.yang.data.api.schema.MapNode;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNodes;
}
- public static List<? extends Entry<YangInstanceIdentifier, NormalizedNode<?, ?>>> evaluate(final DOMQuery query,
- final NormalizedNode<?, ?> root) {
+ /**
+ * Evaluate {@link DOMQuery} on its data element. The element is expected to correspond to
+ * {@link DOMQuery#getRoot()}.
+ *
+ * @param query Query to execute
+ * @param queryRoot Query root object
+ * @return Result of evaluation
+ * @throws NullPointerException if any argument is null
+ */
+ public static DOMQueryResult evaluateOn(final DOMQuery query, final NormalizedNode<?, ?> queryRoot) {
final YangInstanceIdentifier path = query.getSelect();
- return path.isEmpty() ? evalSingle(root, query)
- : evalPath(new ArrayDeque<>(path.getPathArguments()), root, query);
+ return path.isEmpty() ? evalSingle(query, queryRoot) : new LazyDOMQueryResult(query, queryRoot);
}
- private static List<? extends Entry<YangInstanceIdentifier, NormalizedNode<?, ?>>> evalPath(
- final ArrayDeque<PathArgument> remaining, final NormalizedNode<?,?> data, final DOMQuery query) {
- NormalizedNode<?, ?> evalRoot = data;
+ /**
+ * Evaluate {@link DOMQuery} on a conceptual root. The element is expected to correspond to the conceptual data tree
+ * root. This method will first find the {@link DOMQuery#getRoot()} and then defer to
+ * {@link #evaluateOn(DOMQuery, NormalizedNode)}.
+ *
+ * @param query Query to execute
+ * @param root Conceptual root object
+ * @return Result of evaluation
+ * @throws NullPointerException if any argument is null
+ */
+ public static DOMQueryResult evaluateOnRoot(final DOMQuery query, final NormalizedNode<?, ?> root) {
+ NormalizedNode<?, ?> evalRoot = root;
for (PathArgument arg : query.getRoot().getPathArguments()) {
- final Optional<NormalizedNode<?, ?>> next = NormalizedNodes.findNode(data, arg);
+ final Optional<NormalizedNode<?, ?>> next = NormalizedNodes.findNode(root, arg);
if (next.isEmpty()) {
- return ImmutableList.of();
+ return DOMQueryResult.of();
}
evalRoot = next.orElseThrow();
}
-
- final List<Entry<YangInstanceIdentifier, NormalizedNode<?, ?>>> result = new ArrayList<>();
- evalPath(result, query.getRoot(), remaining, evalRoot, query);
- return result;
+ return evaluateOn(query, evalRoot);
}
- private static void evalPath(final List<Entry<YangInstanceIdentifier, NormalizedNode<?,?>>> result,
- final YangInstanceIdentifier path, final ArrayDeque<PathArgument> remaining,
- final NormalizedNode<?, ?> data, final DOMQuery query) {
- final PathArgument next = remaining.poll();
- if (next == null) {
- if (matches(data, query)) {
- result.add(new SimpleImmutableEntry<>(path, data));
- }
- return;
- }
-
- if (data instanceof MapNode && next instanceof NodeIdentifier) {
- checkArgument(data.getIdentifier().equals(next), "Unexpected step %s", next);
- for (MapEntryNode child : ((MapNode) data).getValue()) {
- evalPath(result, path.node(child.getIdentifier()), remaining, child, query);
- }
- } else {
- NormalizedNodes.getDirectChild(data, next).ifPresent(
- child -> evalPath(result, path.node(next), remaining, child, query));
- }
- remaining.push(next);
- }
-
- private static List<? extends Entry<YangInstanceIdentifier, NormalizedNode<?, ?>>> evalSingle(
- final NormalizedNode<?, ?> data, final DOMQuery query) {
- return matches(data, query) ? ImmutableList.of()
- : ImmutableList.of(new SimpleImmutableEntry<>(query.getRoot(), data));
- }
-
- private static boolean matches(final NormalizedNode<?, ?> data, final DOMQuery query) {
- for (DOMQueryPredicate pred : query.getPredicates()) {
- if (!pred.test(NormalizedNodes.findNode(data, pred.getPath()).orElse(null))) {
- return false;
- }
- }
- return true;
+ private static DOMQueryResult evalSingle(final DOMQuery query, final NormalizedNode<?, ?> data) {
+ return LazyDOMQueryResultIterator.matches(data, query.getPredicates()) ? DOMQueryResult.of()
+ : DOMQueryResult.of(new SimpleImmutableEntry<>(query.getRoot(), data));
}
}