Fixes #142: handle nulls for RangeSet

Author: cowtowncoder

guava/src/main/java/com/fasterxml/jackson/datatype/guava/deser/RangeSetDeserializer.java

@@ -1,19 +1,22 @@
 package com.fasterxml.jackson.datatype.guava.deser;
 
-import com.fasterxml.jackson.databind.JsonMappingException;
-import com.fasterxml.jackson.databind.type.TypeFactory;
 import java.io.IOException;
 import java.util.Collection;
 import java.util.List;
 
+import com.fasterxml.jackson.databind.JsonMappingException;
+import com.fasterxml.jackson.databind.type.TypeFactory;
+
 import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.core.JsonToken;
 import com.fasterxml.jackson.databind.BeanProperty;
 import com.fasterxml.jackson.databind.DeserializationContext;
 import com.fasterxml.jackson.databind.JavaType;
 import com.fasterxml.jackson.databind.JsonDeserializer;
 import com.fasterxml.jackson.databind.deser.ContextualDeserializer;
 import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
 import com.fasterxml.jackson.databind.type.LogicalType;
+
 import com.google.common.collect.ImmutableRangeSet;
 import com.google.common.collect.Range;
 import com.google.common.collect.RangeSet;
@@ -95,10 +98,35 @@ public RangeSet<Comparable<?>> deserialize(JsonParser p, DeserializationContext
         final Collection<?> ranges = (Collection<?>) _deserializer.deserialize(p, ctxt);
         ImmutableRangeSet.Builder<Comparable<?>> builder = ImmutableRangeSet.builder();
         for (Object ob : ranges) {
+            if (ob == null) {
+                _tryToAddNull(p, ctxt, builder);
+                continue;
+            }
             @SuppressWarnings("unchecked")
             Range<Comparable<?>> range = (Range<Comparable<?>>) ob;
             builder.add(range);
         }
         return builder.build();
     }
+
+    /**
+     * Some/many Guava containers do not allow addition of {@code null} values,
+     * so isolate handling here.
+     *
+     * @since 2.17
+     */
+    protected void _tryToAddNull(JsonParser p, DeserializationContext ctxt,
+            ImmutableRangeSet.Builder<Comparable<?>> builder)
+        throws IOException
+    {
+        // Ideally we'd have better idea of where nulls are accepted, but first
+        // let's just produce something better than NPE:
+        try {
+            builder.add(null);
+        } catch (NullPointerException e) {
+            ctxt.handleUnexpectedToken(_valueType, JsonToken.VALUE_NULL, p,
+                    "Guava `RangeSet` does not accept `null` values");
+        }
+    }
+
 }

guava/src/main/java/com/fasterxml/jackson/datatype/guava/deser/cache/GuavaCacheDeserializer.java

@@ -186,5 +186,4 @@ protected void _tryToAddNull(JsonParser p, DeserializationContext ctxt,
                     ClassUtil.classNameOf(cache));
         }
     }
-
 }

guava/src/test/java/com/fasterxml/jackson/datatype/guava/RangeSetTest.java

@@ -4,6 +4,7 @@
 import com.fasterxml.jackson.databind.JavaType;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.ObjectReader;
+import com.fasterxml.jackson.databind.exc.MismatchedInputException;
 import com.fasterxml.jackson.databind.type.TypeFactory;
 import com.google.common.collect.ImmutableRangeSet;
 import com.google.common.collect.Range;
@@ -48,4 +49,17 @@ public void testSerializeDeserializeImmutableRangeSet() throws Exception {
         assertEquals(rangeSet, MAPPER.readValue(json, new TypeReference<RangeSet<Integer>>() {}));
         assertEquals(rangeSet, MAPPER.readValue(json, new TypeReference<ImmutableRangeSet<Integer>>() {}));
     }
+
+    // [datatypes-collections#142]: nulls in RangeSet JSON
+    public void testDeserializeFromNull() throws Exception
+    {
+        final String json = a2q("[ {'lowerEndpoint':1,'lowerBoundType':'CLOSED'}, null ]");
+        try {
+            RangeSet<?> rs = MAPPER.readValue(json,
+                    new TypeReference<ImmutableRangeSet<Integer>>() {});
+            fail("Should not pass, got: "+rs);
+        } catch (MismatchedInputException e) {
+            verifyException(e, "Guava `RangeSet` does not accept `null` values");
+        }
+    }
 }

release-notes/VERSION-2.x

@@ -28,6 +28,7 @@ Active Maintainers:
 #138 (guava) `GuavaCollectionDeserializer` still throws NPE in some circumstances
  (contributed by Arthur C)
 #140 (guava) `Cache` deserialization fails with NPE for `null` valued entries
+#142 (guava) `RangeSet` deserializer fails for content `null`s with NPE
 
 2.16.0 (15-Nov-2023)