Github user mmiklavc commented on a diff in the pull request:
https://github.com/apache/incubator-metron/pull/119#discussion_r63114632
--- Diff:
metron-platform/metron-common/src/main/java/org/apache/metron/common/query/PredicateProcessor.java
---
@@ -18,12 +18,20 @@
package org.apache.metron.common.query;
-import org.antlr.v4.runtime.*;
-import org.apache.metron.common.query.generated.*;
+import org.antlr.v4.runtime.ANTLRInputStream;
+import org.antlr.v4.runtime.CommonTokenStream;
+import org.antlr.v4.runtime.TokenStream;
+import org.apache.metron.common.query.generated.PredicateLexer;
+import org.apache.metron.common.query.generated.PredicateParser;
+
+import static org.apache.commons.lang3.StringUtils.isEmpty;
public class PredicateProcessor {
public boolean parse(String rule, VariableResolver resolver) {
+ if (isEmpty(rule)) {
--- End diff --
To clarify, I've added the following test cases:
```
Assert.assertTrue(run(null, v -> variableMap.get(v)));
Assert.assertTrue(run("", v -> variableMap.get(v)));
Assert.assertTrue(run(" ", v -> variableMap.get(v)));
```
The null results in an NPE from ANTLR.
Either we:
1. Add an else to return true
2. Do this(my vote): if (rule == null || isEmpty(rule.trim())) { return
true; }
3. Or throw a new exception for the parser
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