xichen01 commented on code in PR #8275:
URL: https://github.com/apache/ozone/pull/8275#discussion_r2047300309


##########
hadoop-ozone/common/src/test/java/org/apache/hadoop/ozone/om/helpers/TestOmLCExpiration.java:
##########
@@ -0,0 +1,165 @@
+/*
+ * 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.hadoop.ozone.om.helpers;
+
+import static 
org.apache.hadoop.ozone.om.exceptions.OMException.ResultCodes.INVALID_REQUEST;
+import static org.apache.hadoop.ozone.om.helpers.OMLCUtils.assertOMException;
+import static org.apache.hadoop.ozone.om.helpers.OMLCUtils.getFutureDateString;
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * Test OmLCExpiration.
+ */
+class TestOmLCExpiration {
+
+  @Test
+  public void testCreateValidOmLCExpiration() {
+    OmLCExpiration exp1 = new OmLCExpiration.Builder()
+        .setDays(30)
+        .build();
+    assertDoesNotThrow(exp1::valid);
+
+    OmLCExpiration exp2 = new OmLCExpiration.Builder()
+        .setDate("2099-10-10T00:00:00Z")
+        .build();
+    assertDoesNotThrow(exp2::valid);
+
+    OmLCExpiration exp3 = new OmLCExpiration.Builder()
+        .setDays(1)
+        .build();
+    assertDoesNotThrow(exp3::valid);
+
+    OmLCExpiration exp4 = new OmLCExpiration.Builder()
+        .setDate("2099-12-31T00:00:00Z")
+        .build();
+    assertDoesNotThrow(exp4::valid);
+
+    OmLCExpiration exp5 = new OmLCExpiration.Builder()
+        .setDate("2099-02-15T00:00:00.000Z")
+        .build();
+    assertDoesNotThrow(exp5::valid);
+  }
+
+  @Test
+  public void testCreateInValidOmLCExpiration() {
+    OmLCExpiration exp1 = new OmLCExpiration.Builder()
+        .setDays(30)
+        .setDate(getFutureDateString(100))
+        .build();
+    assertOMException(exp1::valid, INVALID_REQUEST,
+        "Either 'days' or 'date' should be specified, but not both or 
neither.");
+
+    OmLCExpiration exp2 = new OmLCExpiration.Builder()
+        .setDays(-1)
+        .build();
+    assertOMException(exp2::valid, INVALID_REQUEST,
+        "'Days' for Expiration action must be a positive integer");
+
+    OmLCExpiration exp3 = new OmLCExpiration.Builder()
+        .setDate(null)
+        .build();
+    assertOMException(exp3::valid, INVALID_REQUEST,
+        "Either 'days' or 'date' should be specified, but not both or 
neither.");
+
+    OmLCExpiration exp4 = new OmLCExpiration.Builder()
+        .setDate("")
+        .build();
+    assertOMException(exp4::valid, INVALID_REQUEST,
+        "Either 'days' or 'date' should be specified, but not both or 
neither.");
+
+    OmLCExpiration exp5 = new OmLCExpiration.Builder()
+        .build();
+    assertOMException(exp5::valid, INVALID_REQUEST,
+        "Either 'days' or 'date' should be specified, but not both or 
neither.");
+
+    OmLCExpiration exp6 = new OmLCExpiration.Builder()
+        .setDate("10-10-2099")
+        .build();
+    assertOMException(exp6::valid, INVALID_REQUEST,
+        "'Date' must be in ISO 8601 format");
+
+    OmLCExpiration exp7 = new OmLCExpiration.Builder()
+        .setDate("2099-12-31T00:00:00")
+        .build();
+    assertOMException(exp7::valid, INVALID_REQUEST,
+        "'Date' must be in ISO 8601 format");
+
+    // Testing for date in the past
+    OmLCExpiration exp8 = new OmLCExpiration.Builder()
+        .setDate(getFutureDateString(-1))
+        .build();
+    assertOMException(exp8::valid, INVALID_REQUEST,
+        "'Date' must be in the future");
+
+    OmLCExpiration exp9 = new OmLCExpiration.Builder()
+        .setDays(0)
+        .build();
+    assertOMException(exp9::valid, INVALID_REQUEST,
+        "Either 'days' or 'date' should be specified, but not both or 
neither.");

Review Comment:
   ”0 day“ maybe it is not set or set to 0. We do not clearly distinguish these 
two cases. So this 0 day be treat as not set



##########
hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/om/helpers/OmLCRule.java:
##########
@@ -0,0 +1,238 @@
+/*
+ * 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.hadoop.ozone.om.helpers;
+
+import java.util.ArrayList;
+import java.util.List;
+import org.apache.commons.lang3.RandomStringUtils;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.hadoop.ozone.om.exceptions.OMException;
+
+/**
+ * A class that encapsulates lifecycle rule.
+ */
+public class OmLCRule {
+
+  public static final int LC_ID_LENGTH = 48;
+  // Ref: 
https://docs.aws.amazon.com/AmazonS3/latest/userguide/intro-lifecycle-rules.html#intro-lifecycle-rule-id
+  public static final int LC_ID_MAX_LENGTH = 255;
+
+  private String id;
+  private String prefix;
+  private boolean enabled;
+  private boolean isPrefixEnable;
+  private boolean isTagEnable;
+  // List of actions for this rule
+  private List<OmLCAction> actions;
+  private OmLCFilter filter;
+
+  OmLCRule(String id, String prefix, boolean enabled,
+      List<OmLCAction> actions, OmLCFilter filter) {
+    this.id = id;
+    this.prefix = prefix;
+    this.enabled = enabled;
+    this.actions = actions;
+    this.filter = filter;
+
+    if (StringUtils.isEmpty(this.id)) {
+      this.id = RandomStringUtils.randomAlphanumeric(LC_ID_LENGTH);
+    }
+
+    OmLifecycleRuleAndOperator andOperator = filter != null ? 
filter.getAndOperator() : null;
+
+    if (prefix != null ||
+        (filter != null && filter.getPrefix() != null) ||
+        (andOperator != null && andOperator.getPrefix() != null)) {
+      isPrefixEnable = true;
+    }
+
+    if ((filter != null && filter.getTag() != null) ||
+        (andOperator != null && !andOperator.getTags().isEmpty())) {
+      isTagEnable = true;
+    }
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public void setId(String id) {
+    this.id = id;
+  }
+
+  public String getPrefix() {
+    return prefix;
+  }
+
+  public void setPrefix(String prefix) {
+    this.prefix = prefix;
+  }
+
+  public boolean isEnabled() {
+    return enabled;
+  }
+
+  public void setEnabled(boolean enabled) {
+    this.enabled = enabled;
+  }
+
+  public List<OmLCAction> getActions() {
+    return actions;
+  }
+
+  public void setActions(List<OmLCAction> actions) {
+    this.actions = actions;
+  }
+
+  /**
+   * Get the expiration action if present.
+   *
+   * @return the expiration action if present, null otherwise
+   */
+  public OmLCExpiration getExpiration() {
+    if (actions == null || actions.isEmpty()) {
+      return null;
+    }
+
+    for (OmLCAction action : actions) {
+      if (action instanceof OmLCExpiration) {
+        return (OmLCExpiration) action;
+      }
+    }
+    return null;
+  }
+
+  public OmLCFilter getFilter() {
+    return filter;
+  }
+
+  public boolean isPrefixEnable() {
+    return isPrefixEnable;
+  }
+
+  public boolean isTagEnable() {
+    return isTagEnable;
+  }
+
+  public void setFilter(OmLCFilter filter) {
+    this.filter = filter;
+  }
+
+  /**
+   * Validates the lifecycle rule.
+   * - ID length should not exceed the allowed limit
+   * - At least one action must be specified
+   * - Filter and Prefix cannot be used together
+   * - Actions must be valid
+   * - Filter must be valid
+   * - There must be at most one Expiration action per rule
+   *
+   * @throws OMException if the validation fails
+   */
+  public void valid() throws OMException {
+    if (id.length() > LC_ID_MAX_LENGTH) {
+      throw new OMException("ID length should not exceed allowed limit of " + 
LC_ID_MAX_LENGTH,
+          OMException.ResultCodes.INVALID_REQUEST);
+    }
+
+    if (actions == null || actions.isEmpty()) {
+      throw new OMException("At least one action needs to be specified in a 
rule.",
+          OMException.ResultCodes.INVALID_REQUEST);
+    }
+
+    // Check that there is at most one Expiration action
+    for (OmLCAction action : actions) {
+      if (action.getActionType() == OmLCAction.ActionType.EXPIRATION) {
+        if (actions.size() > 1) {
+          throw new OMException("A rule can have at most one Expiration 
action.",
+              OMException.ResultCodes.INVALID_REQUEST);
+        }
+      }
+      action.valid();
+    }
+
+    if (prefix != null && filter != null) {

Review Comment:
   Yes, prefix can be empty (""), this means that all the keys under the bucket 
will be matched. (the prefix in the AndOperator can be empty ("") too)



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