1644 - added support of eq:null to the policies

odd-platform-api/src/main/java/org/opendatadiscovery/oddplatform/service/policy/comparer/ArrayFieldComparer.java

@@ -25,8 +25,13 @@ public boolean match(final String value, final T context) {
 
     @Override
     public boolean equals(final String value, final T context) {
-        return fieldExtractor.apply(context).stream()
-            .anyMatch(value::equals);
+        final List<String> listOfElements = fieldExtractor.apply(context)
+            .stream()
+            .toList();
+
+        return value == null
+            ? listOfElements.isEmpty()
+            : listOfElements.stream().anyMatch(value::equals);
     }
 
     @Override

odd-platform-api/src/main/java/org/opendatadiscovery/oddplatform/service/policy/comparer/SimpleFieldComparer.java

@@ -22,8 +22,10 @@ public boolean match(final String value, final T context) {
     }
 
     @Override
-    public boolean equals(final String value, final  T context) {
-        return value.equals(fieldExtractor.apply(context));
+    public boolean equals(final String value, final T context) {
+        return value == null
+            ? fieldExtractor.apply(context) == null
+            : value.equals(fieldExtractor.apply(context));
     }
 
     @Override

odd-platform-api/src/main/java/org/opendatadiscovery/oddplatform/service/policy/comparer/dataentity/DataEntityDataSourceFieldComparer.java

@@ -11,6 +11,8 @@ public DataEntityDataSourceFieldComparer(final Function<DataSourcePojo, String>
     }
 
     private static DataSourcePojo getDataEntityDataSource(final DataEntityPolicyResolverContext context) {
-        return context.dataEntity().getDataSource();
+        return context.dataEntity().getDataSource() == null
+            ? new DataSourcePojo()
+            : context.dataEntity().getDataSource();
     }
 }

odd-platform-api/src/main/java/org/opendatadiscovery/oddplatform/service/policy/comparer/dataentity/DataEntityFieldComparer.java

@@ -11,6 +11,8 @@ public DataEntityFieldComparer(final Function<DataEntityPojo, String> fieldExtra
     }
 
     private static DataEntityPojo getDataEntity(final DataEntityPolicyResolverContext context) {
-        return context.dataEntity().getDataEntity();
+        return context.dataEntity().getDataEntity() == null
+            ? new DataEntityPojo()
+            : context.dataEntity().getDataEntity();
     }
 }

odd-platform-api/src/main/java/org/opendatadiscovery/oddplatform/service/policy/comparer/dataentity/DataEntityNamespaceFieldComparer.java

@@ -11,6 +11,8 @@ public DataEntityNamespaceFieldComparer(final Function<NamespacePojo, String> fi
     }
 
     private static NamespacePojo getDataEntityNamespace(final DataEntityPolicyResolverContext context) {
-        return context.dataEntity().getNamespace();
+        return context.dataEntity().getNamespace() == null
+            ? new NamespacePojo()
+            : context.dataEntity().getNamespace();
     }
 }

odd-platform-api/src/main/java/org/opendatadiscovery/oddplatform/service/policy/comparer/queryexample/QueryExampleFieldComparer.java

@@ -1,8 +1,10 @@
 package org.opendatadiscovery.oddplatform.service.policy.comparer.queryexample;
 
+import java.util.List;
 import java.util.function.Function;
 import org.opendatadiscovery.oddplatform.dto.QueryExampleDto;
 import org.opendatadiscovery.oddplatform.dto.policy.QueryExamplePolicyResolverContext;
+import org.opendatadiscovery.oddplatform.model.tables.pojos.QueryExamplePojo;
 import org.opendatadiscovery.oddplatform.service.policy.comparer.SimpleFieldComparer;
 
 public class QueryExampleFieldComparer extends SimpleFieldComparer<QueryExamplePolicyResolverContext> {
@@ -11,6 +13,8 @@ public QueryExampleFieldComparer(final Function<QueryExampleDto, String> fieldEx
     }
 
     private static QueryExampleDto getQueryExample(final QueryExamplePolicyResolverContext context) {
-        return context.detailsDto();
+        return context.detailsDto() == null
+            ? new QueryExampleDto(new QueryExamplePojo(), List.of())
+            : context.detailsDto();
     }
 }

odd-platform-api/src/main/java/org/opendatadiscovery/oddplatform/service/policy/comparer/term/TermFieldComparer.java

@@ -11,6 +11,8 @@ public TermFieldComparer(final Function<TermPojo, String> fieldExtractor) {
     }
 
     private static TermPojo getTerm(final TermPolicyResolverContext context) {
-        return context.detailsDto().getTermDto().getTermRefDto().getTerm();
+        return context.detailsDto().getTermDto().getTermRefDto().getTerm() == null
+            ? new TermPojo()
+            : context.detailsDto().getTermDto().getTermRefDto().getTerm();
     }
 }

odd-platform-api/src/main/java/org/opendatadiscovery/oddplatform/service/policy/comparer/term/TermNamespaceFieldComparer.java

@@ -11,6 +11,8 @@ public TermNamespaceFieldComparer(final Function<NamespacePojo, String> fieldExt
     }
 
     private static NamespacePojo getTermNamespace(final TermPolicyResolverContext context) {
-        return context.detailsDto().getTermDto().getTermRefDto().getNamespace();
+        return context.detailsDto().getTermDto().getTermRefDto().getNamespace() == null
+            ? new NamespacePojo()
+            : context.detailsDto().getTermDto().getTermRefDto().getNamespace();
     }
 }

odd-platform-api/src/main/java/org/opendatadiscovery/oddplatform/service/policy/resolver/AbstractConditionResolver.java

@@ -2,6 +2,7 @@
 
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Optional;
 import org.opendatadiscovery.oddplatform.dto.policy.PolicyConditionDto;
 import org.opendatadiscovery.oddplatform.dto.policy.PolicyConditionKeyDto;
@@ -22,7 +23,7 @@ public boolean resolve(final PolicyConditionDto condition, final T context) {
             return resolveAny(condition.getAny(), context);
         } else if (condition.getEq() != null) {
             final Map.Entry<PolicyConditionKeyDto, Object> entry = getUnaryCondition(condition.getEq());
-            return resolveEquals(entry.getKey(), entry.getValue().toString(), context);
+            return resolveEquals(entry.getKey(), Objects.toString(entry.getValue(), null), context);
         } else if (condition.getNotEq() != null) {
             final Map.Entry<PolicyConditionKeyDto, Object> entry = getUnaryCondition(condition.getNotEq());
             return resolveNotEquals(entry.getKey(), entry.getValue().toString(), context);