| /* |
| * 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.druid.segment.nested; |
| |
| import com.fasterxml.jackson.annotation.JsonCreator; |
| import com.fasterxml.jackson.core.JsonProcessingException; |
| import com.google.common.primitives.Longs; |
| import net.jpountz.xxhash.XXHash64; |
| import net.jpountz.xxhash.XXHashFactory; |
| import org.apache.druid.java.util.common.guava.Comparators; |
| import org.apache.druid.segment.column.TypeStrategies; |
| |
| import javax.annotation.Nullable; |
| import java.util.Arrays; |
| import java.util.Comparator; |
| import java.util.Objects; |
| import java.util.function.LongSupplier; |
| |
| public class StructuredData implements Comparable<StructuredData> |
| { |
| private static final XXHash64 HASH_FUNCTION = XXHashFactory.fastestInstance().hash64(); |
| |
| // seed from the example... but, it doesn't matter what it is as long as its the same every time |
| private static int SEED = 0x9747b28c; |
| |
| public static final Comparator<StructuredData> COMPARATOR = Comparators.naturalNullsFirst(); |
| |
| private static long computeHash(StructuredData data) |
| { |
| try { |
| final byte[] bytes = NestedDataComplexTypeSerde.OBJECT_MAPPER.writeValueAsBytes(data.value); |
| return HASH_FUNCTION.hash(bytes, 0, bytes.length, SEED); |
| } |
| catch (JsonProcessingException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| @Nullable |
| public static StructuredData wrap(@Nullable Object value) |
| { |
| if (value == null || value instanceof StructuredData) { |
| return (StructuredData) value; |
| } |
| return new StructuredData(value); |
| } |
| |
| @Nullable |
| public static Object unwrap(@Nullable Object value) |
| { |
| if (value instanceof StructuredData) { |
| return ((StructuredData) value).getValue(); |
| } |
| return value; |
| } |
| |
| @JsonCreator |
| public static StructuredData create(Object value) |
| { |
| return new StructuredData(value); |
| } |
| |
| |
| private final Object value; |
| private volatile boolean hashInitialized = false; |
| private volatile long hashValue; |
| private final LongSupplier hash = () -> { |
| if (!hashInitialized) { |
| hashValue = computeHash(this); |
| hashInitialized = true; |
| } |
| return hashValue; |
| }; |
| |
| public StructuredData(Object value) |
| { |
| this.value = value; |
| } |
| |
| public Object getValue() |
| { |
| return value; |
| } |
| |
| private boolean isNull() |
| { |
| return value == null; |
| } |
| |
| private boolean isString() |
| { |
| return value instanceof String; |
| } |
| |
| private boolean isNumber() |
| { |
| return value instanceof Number; |
| } |
| |
| private String asString() |
| { |
| return (String) value; |
| } |
| |
| private Number asNumber() |
| { |
| return (Number) value; |
| } |
| |
| @Override |
| public int compareTo(StructuredData o) |
| { |
| if (this.equals(o)) { |
| return 0; |
| } |
| if (isNull()) { |
| return -1; |
| } |
| if (o.isNull()) { |
| return 1; |
| } |
| |
| // string before numbers and objects |
| if (isString()) { |
| if (o.isString()) { |
| return TypeStrategies.STRING.compare(asString(), o.asString()); |
| } |
| return -1; |
| } |
| if (o.isString()) { |
| return 1; |
| } |
| |
| // numbers before objects |
| if (isNumber()) { |
| if (o.isNumber()) { |
| return TypeStrategies.DOUBLE.compare(asNumber().doubleValue(), o.asNumber().doubleValue()); |
| } |
| return -1; |
| } |
| if (o.isNumber()) { |
| return 1; |
| } |
| |
| // finally compare hashes. there is a small chance of collisions for objects that are not equal but have the |
| // same hash, we could revisit this later if needed |
| return Long.compare(hash.getAsLong(), o.hash.getAsLong()); |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| StructuredData that = (StructuredData) o; |
| if (value instanceof Object[] && that.value instanceof Object[]) { |
| return Arrays.deepEquals((Object[]) value, (Object[]) that.value); |
| } |
| return Objects.equals(value, that.value); |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return Objects.hash(value); |
| } |
| |
| // hashCode that relies on the object equality. Translates the hashcode to an integer as well |
| public int equalityHash() |
| { |
| return Longs.hashCode(hash.getAsLong()); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return "StructuredData{" + |
| "value=" + value + |
| '}'; |
| } |
| } |