kbendick commented on a change in pull request #4037:
URL: https://github.com/apache/iceberg/pull/4037#discussion_r799075359
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File path: core/src/main/java/org/apache/iceberg/util/JsonUtil.java
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@@ -117,6 +127,31 @@ public static String getStringOrNull(String property,
JsonNode node) {
return builder.build();
}
+ public static Map<String, String> getStringMapOrNull(String property,
JsonNode node) {
+ if (!node.has(property)) {
+ return null;
+ }
+
+ JsonNode pNode = node.get(property);
+ if (pNode == null || pNode.isNull()) {
+ return null;
+ }
+
+ Preconditions.checkArgument(pNode.isObject(),
+ "Cannot parse %s from non-object value: %s", property, pNode);
+ return buildStringMapFromJsonNodeObject(pNode);
+ }
+
+ private static Map<String, String> buildStringMapFromJsonNodeObject(JsonNode
pNode) {
+ ImmutableMap.Builder<String, String> builder = ImmutableMap.builder();
+ Iterator<String> fields = pNode.fieldNames();
+ while (fields.hasNext()) {
+ String field = fields.next();
+ builder.put(field, getString(field, pNode));
+ }
+ return builder.build();
Review comment:
This function is written such that it can be used in `getStringMap` and
the differences between `getStringMap` and `getStringMapOrNull` would be in
precondition checks, but I chose not to make that change to the existing code
for now.
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