eric-maynard commented on code in PR #1238:
URL: https://github.com/apache/polaris/pull/1238#discussion_r2012627006


##########
polaris-core/src/main/java/org/apache/polaris/core/policy/validator/PolicyValidator.java:
##########
@@ -0,0 +1,52 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.polaris.core.policy.validator;
+
+import org.apache.polaris.core.entity.PolarisEntitySubType;
+import org.apache.polaris.core.entity.PolarisEntityType;
+
+/**
+ * Validates and parses a given policy content string against its defined 
schema.
+ *
+ * @param <T> the type of policy object to be returned after validation
+ */
+public interface PolicyValidator<T> {
+
+  /**
+   * Parses and validates the provided policy content.
+   *
+   * @param content the policy content to parse and validate
+   * @return a policy object of type T if the content is valid
+   * @throws InvalidPolicyException if the content does not meet the required 
policy rules
+   */
+  T parse(String content) throws InvalidPolicyException;

Review Comment:
   I was imagining something like:
   
   ```
   public interface Policy<T extends Policy<T>> {
       T fromString(String content);
   }
   ```
   
   This way I can just write my implementations like this:
   
   ```
   public class CompactionPolicy implements Policy {
     public CompactionPolicy fromString(...)
   }
   
   public class RbacPolicy implements Policy {
     public RbacPolicy fromString(...)
   }
   ```



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