jerryshao commented on code in PR #7333: URL: https://github.com/apache/gravitino/pull/7333#discussion_r2165922764
########## api/src/main/java/org/apache/gravitino/stats/StatisticValues.java: ########## @@ -0,0 +1,221 @@ +/* + * 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.gravitino.stats; + +import com.google.common.base.Preconditions; +import java.util.List; +import java.util.Map; +import org.apache.gravitino.rel.types.Type; +import org.apache.gravitino.rel.types.Types; + +/** A class representing a collection of statistic values. */ +public class StatisticValues { + + private StatisticValues() {} + + /** + * Creates a statistic value that holds a boolean value. + * + * @param value the boolean value to be held by this statistic value + * @return a BooleanValue instance containing the provided boolean value + */ + public static BooleanValue booleanValue(boolean value) { + return new BooleanValue(value); + } + + /** + * Creates a statistic value that holds a long value. + * + * @param value the long value to be held by this statistic value + * @return a LongValue instance containing the provided long value + */ + public static LongValue longValue(long value) { + return new LongValue(value); + } + + /** + * Creates a statistic value that holds a double value. + * + * @param value the double value to be held by this statistic value + * @return a DoubleValue instance containing the provided double value + */ + public static DoubleValue doubleValue(double value) { + return new DoubleValue(value); + } + + /** + * Creates a statistic value that holds a string value. + * + * @param value the string value to be held by this statistic value + * @return a StringValue instance containing the provided string value + */ + public static StringValue stringValue(String value) { + return new StringValue(value); + } + + /** + * Creates a statistic value that holds a list of other statistic values. + * + * @param values the list of statistic values to be held by this statistic value + * @return a ListValue instance containing the provided list of statistic values + */ + public static ListValue listValue(List<StatisticValue> values) { + return new ListValue(values); + } + + /** + * Creates a statistic value that holds a map of string keys to other statistic values. + * + * @param values the map of string keys to statistic values to be held by this statistic value + * @return an ObjectValue instance containing the provided map of statistic values + */ + public static ObjectValue objectValue(Map<String, StatisticValue> values) { + return new ObjectValue(values); + } + + /** A statistic value that holds a Boolean value. */ + public static class BooleanValue implements StatisticValue<Boolean> { + private final Boolean value; + + private BooleanValue(Boolean value) { + this.value = value; + } + + @Override + public Boolean value() { + return value; + } + + @Override + public Type dataType() { + return Types.BooleanType.get(); + } + } + + /** A statistic value that holds a Long value. */ + public static class LongValue implements StatisticValue<Long> { + private final Long value; + + private LongValue(Long value) { + this.value = value; + } + + @Override + public Long value() { + return value; + } + + @Override + public Type dataType() { + return Types.LongType.get(); + } + } + + /** A statistic value that holds a Double value. */ + public static class DoubleValue implements StatisticValue<Double> { + private final Double value; + + private DoubleValue(Double value) { + this.value = value; + } + + @Override + public Double value() { + return value; + } + + @Override + public Type dataType() { + return Types.DoubleType.get(); + } + } + + /** A statistic value that holds a String value. */ + public static class StringValue implements StatisticValue<String> { + private final String value; + + private StringValue(String value) { + this.value = value; + } + + @Override + public String value() { + return value; + } + + @Override + public Type dataType() { + return Types.StringType.get(); + } + } + + /** A statistic value that holds a List of other statistic values. */ + public static class ListValue implements StatisticValue<List<StatisticValue>> { + private final List<StatisticValue> valueList; + + private ListValue(List<StatisticValue> valueList) { + Preconditions.checkArgument( + valueList != null && !valueList.isEmpty(), "Values cannot be null or empty"); + + Type dataType = valueList.get(0).dataType(); + Preconditions.checkArgument( + valueList.stream().allMatch(value -> value.dataType().equals(dataType)), + "All values in the list must have the same data type"); + + this.valueList = valueList; + } + + @Override + public List<StatisticValue> value() { + return valueList; + } + + @Override + public Type dataType() { + return Types.ListType.nullable(valueList.get(0).dataType()); + } + } + + /** A statistic value that holds a Map of String keys to other statistic values. */ + public static class ObjectValue implements StatisticValue<Map<String, StatisticValue>> { Review Comment: Why call it `ObjectValue`, not `MapValue`? 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