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Reduce object allocation in Comparator
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103 changes: 103 additions & 0 deletions
103
community/values/src/main/java/org/neo4j/values/Comparison.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| /* | ||
| * Copyright (c) 2002-2018 "Neo Technology," | ||
| * Network Engine for Objects in Lund AB [http://neotechnology.com] | ||
| * | ||
| * This file is part of Neo4j. | ||
| * | ||
| * Neo4j is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
| package org.neo4j.values; | ||
|
|
||
| /** | ||
| * Defines the result of a ternary comparison. | ||
| * <p> | ||
| * In a ternary comparison the result may not only be greater than, equal or smaller than but the | ||
| * result can also be undefined. | ||
| */ | ||
| public enum Comparison | ||
| { | ||
| GREATER_THAN | ||
| { | ||
| @Override | ||
| public int value() | ||
| { | ||
| return 1; | ||
| } | ||
|
|
||
| }, | ||
| EQUAL | ||
| { | ||
| @Override | ||
| public int value() | ||
| { | ||
| return 0; | ||
| } | ||
|
|
||
| }, | ||
| SMALLER_THAN | ||
| { | ||
| @Override | ||
| public int value() | ||
| { | ||
| return -1; | ||
| } | ||
|
|
||
| }, | ||
| UNDEFINED | ||
| { | ||
| @Override | ||
| public int value() | ||
| { | ||
| throw new IllegalStateException( | ||
| "This value is undefined and can't handle primitive comparisons" ); | ||
| } | ||
|
|
||
| }; | ||
|
|
||
| /** | ||
| * Integer representation of comparison | ||
| * <p> | ||
| * Returns a positive integer if {@link Comparison#GREATER_THAN} than, negative integer for | ||
| * {@link Comparison#SMALLER_THAN}, | ||
| * and zero for {@link Comparison#EQUAL} | ||
| * | ||
| * @return a positive number if result is greater than, a negative number if the result is smaller than or zero | ||
| * if equal. | ||
| * @throws IllegalStateException if the result is undefined. | ||
| */ | ||
| public abstract int value(); | ||
|
|
||
| /** | ||
| * Maps an integer value to comparison result. | ||
| * | ||
| * @param i the integer to be mapped to a Comparison | ||
| * @return {@link Comparison#GREATER_THAN} than if positive, {@link Comparison#SMALLER_THAN} if negative or | ||
| * {@link Comparison#EQUAL} if zero | ||
| */ | ||
| public static Comparison from( int i ) | ||
| { | ||
| if ( i > 0 ) | ||
| { | ||
| return GREATER_THAN; | ||
| } | ||
| else if ( i < 0 ) | ||
| { | ||
| return SMALLER_THAN; | ||
| } | ||
| else | ||
| { | ||
| return EQUAL; | ||
| } | ||
| } | ||
| } |
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