| /* |
| * 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.tinkerpop.gremlin.process.traversal; |
| |
| import org.apache.tinkerpop.gremlin.util.NumberHelper; |
| |
| import java.util.function.BiPredicate; |
| |
| /** |
| * {@code Compare} is a {@code BiPredicate} that determines whether the first argument is {@code ==}, {@code !=}, |
| * {@code >}, {@code >=}, {@code <}, {@code <=} to the second argument. |
| * |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| * @author Stephen Mallette (http://stephen.genoprime.com) |
| * @author Matt Frantz (http://github.com/mhfrantz) |
| * @author Daniel Kuppitz (http://gemlin.guru) |
| */ |
| public enum Compare implements BiPredicate<Object, Object> { |
| |
| /** |
| * Evaluates if the first object is equal to the second. If both are of type {@link Number}, {@link NumberHelper} |
| * will be used for the comparison, thus enabling the comparison of only values, ignoring the number types. |
| * |
| * @since 3.0.0-incubating |
| */ |
| eq { |
| @Override |
| public boolean test(final Object first, final Object second) { |
| return null == first ? null == second : (bothAreNumber(first, second) |
| ? NumberHelper.compare((Number) first, (Number) second) == 0 |
| : first.equals(second)); |
| } |
| |
| /** |
| * The negative of {@code eq} is {@link #neq}. |
| */ |
| @Override |
| public Compare negate() { |
| return neq; |
| } |
| }, |
| |
| /** |
| * Evaluates if the first object is not equal to the second. If both are of type {@link Number}, {@link NumberHelper} |
| * will be used for the comparison, thus enabling the comparison of only values, ignoring the number types. |
| * |
| * @since 3.0.0-incubating |
| */ |
| neq { |
| @Override |
| public boolean test(final Object first, final Object second) { |
| return !eq.test(first, second); |
| } |
| |
| /** |
| * The negative of {@code neq} is {@link #eq} |
| */ |
| @Override |
| public Compare negate() { |
| return eq; |
| } |
| }, |
| |
| /** |
| * Evaluates if the first object is greater than the second. If both are of type {@link Number}, {@link NumberHelper} |
| * will be used for the comparison, thus enabling the comparison of only values, ignoring the number types. |
| * |
| * @since 3.0.0-incubating |
| */ |
| gt { |
| @Override |
| public boolean test(final Object first, final Object second) { |
| if (null != first && null != second) { |
| if (bothAreNumber(first, second)) { |
| return NumberHelper.compare((Number) first, (Number) second) > 0; |
| } |
| if (bothAreComparableAndOfSameType(first, second)) { |
| return ((Comparable) first).compareTo(second) > 0; |
| } |
| throwException(first, second); |
| } |
| |
| return false; |
| } |
| |
| /** |
| * The negative of {@code gt} is {@link #lte}. |
| */ |
| @Override |
| public Compare negate() { |
| return lte; |
| } |
| }, |
| |
| /** |
| * Evaluates if the first object is greater-equal to the second. If both are of type {@link Number}, {@link NumberHelper} |
| * will be used for the comparison, thus enabling the comparison of only values, ignoring the number types. |
| * |
| * @since 3.0.0-incubating |
| */ |
| gte { |
| @Override |
| public boolean test(final Object first, final Object second) { |
| return null == first ? null == second : (null != second && !lt.test(first, second)); |
| } |
| |
| /** |
| * The negative of {@code gte} is {@link #lt}. |
| */ |
| @Override |
| public Compare negate() { |
| return lt; |
| } |
| }, |
| |
| /** |
| * Evaluates if the first object is less than the second. If both are of type {@link Number}, {@link NumberHelper} |
| * will be used for the comparison, thus enabling the comparison of only values, ignoring the number types. |
| * |
| * @since 3.0.0-incubating |
| */ |
| lt { |
| @Override |
| public boolean test(final Object first, final Object second) { |
| if (null != first && null != second) { |
| if (bothAreNumber(first, second)) { |
| return NumberHelper.compare((Number) first, (Number) second) < 0; |
| } |
| if (bothAreComparableAndOfSameType(first, second)) { |
| return ((Comparable) first).compareTo(second) < 0; |
| } |
| throwException(first, second); |
| } |
| return false; |
| } |
| |
| /** |
| * The negative of {@code lt} is {@link #gte}. |
| */ |
| @Override |
| public Compare negate() { |
| return gte; |
| } |
| }, |
| |
| /** |
| * Evaluates if the first object is less-equal to the second. If both are of type {@link Number}, {@link NumberHelper} |
| * will be used for the comparison, thus enabling the comparison of only values, ignoring the number types. |
| * |
| * @since 3.0.0-incubating |
| */ |
| lte { |
| @Override |
| public boolean test(final Object first, final Object second) { |
| return null == first ? null == second : (null != second && !gt.test(first, second)); |
| } |
| |
| /** |
| * The negative of {@code lte} is {@link #gt}. |
| */ |
| @Override |
| public Compare negate() { |
| return gt; |
| } |
| }; |
| |
| private static boolean bothAreNumber(Object first, Object second) { |
| return first instanceof Number && second instanceof Number; |
| } |
| |
| private static boolean bothAreComparableAndOfSameType(Object first, Object second) { |
| return first instanceof Comparable && second instanceof Comparable |
| && (first.getClass().isInstance(second) || second.getClass().isInstance(first)); |
| } |
| |
| private static void throwException(Object first, Object second) { |
| throw new IllegalArgumentException(String.format("Cannot compare '%s' (%s) and '%s' (%s) as both need to be an instance of Number or Comparable (and of the same type)", first, first.getClass().getSimpleName(), second, second.getClass().getSimpleName())); |
| } |
| |
| /** |
| * Produce the opposite representation of the current {@code Compare} enum. |
| */ |
| @Override |
| public abstract Compare negate(); |
| } |