| /* |
| * 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 java.util.Comparator; |
| import java.util.Map; |
| import java.util.Random; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public enum Order implements Comparator<Object> { |
| |
| incr { |
| @Override |
| public int compare(final Object first, final Object second) { |
| return Comparator.<Comparable>naturalOrder().compare((Comparable) first, (Comparable) second); |
| } |
| |
| @Override |
| public Order reversed() { |
| return decr; |
| } |
| }, decr { |
| @Override |
| public int compare(final Object first, final Object second) { |
| return Comparator.<Comparable>reverseOrder().compare((Comparable) first, (Comparable) second); |
| } |
| |
| @Override |
| public Order reversed() { |
| return incr; |
| } |
| }, |
| /* |
| * @deprecated Use {@link org.apache.tinkerpop.gremlin.structure.Column#keys}; |
| @Deprecated |
| */ |
| keyIncr { |
| @Override |
| public int compare(final Object first, final Object second) { |
| return Comparator.<Comparable>naturalOrder().compare(((Map.Entry<Comparable, ?>) first).getKey(), ((Map.Entry<Comparable, ?>) second).getKey()); |
| } |
| |
| @Override |
| public Order reversed() { |
| return keyDecr; |
| } |
| }, |
| /* |
| * @deprecated Use {@link org.apache.tinkerpop.gremlin.structure.Column#values}; |
| * |
| @Deprecated */ |
| valueIncr { |
| @Override |
| public int compare(final Object first, final Object second) { |
| return Comparator.<Comparable>naturalOrder().compare(((Map.Entry<?, Comparable>) first).getValue(), ((Map.Entry<?, Comparable>) second).getValue()); |
| } |
| |
| @Override |
| public Order reversed() { |
| return valueDecr; |
| } |
| }, |
| /* |
| * @deprecated Use {@link org.apache.tinkerpop.gremlin.structure.Column#keys}; |
| * |
| @Deprecated */ |
| keyDecr { |
| @Override |
| public int compare(final Object first, final Object second) { |
| return Comparator.<Comparable>reverseOrder().compare(((Map.Entry<Comparable, ?>) first).getKey(), ((Map.Entry<Comparable, ?>) second).getKey()); |
| } |
| |
| @Override |
| public Order reversed() { |
| return keyIncr; |
| } |
| }, |
| /* |
| * @deprecated Use {@link org.apache.tinkerpop.gremlin.structure.Column#values}; |
| * |
| @Deprecated */ |
| valueDecr { |
| @Override |
| public int compare(final Object first, final Object second) { |
| return Comparator.<Comparable>reverseOrder().compare(((Map.Entry<?, Comparable>) first).getValue(), ((Map.Entry<?, Comparable>) second).getValue()); |
| } |
| |
| @Override |
| public Order reversed() { |
| return valueIncr; |
| } |
| }, shuffle { |
| @Override |
| public int compare(final Object first, final Object second) { |
| return RANDOM.nextBoolean() ? -1 : 1; |
| } |
| |
| @Override |
| public Order reversed() { |
| return shuffle; |
| } |
| }; |
| |
| private static final Random RANDOM = new Random(); |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public abstract int compare(final Object first, final Object second); |
| |
| /** |
| * Produce the opposite representation of the current {@code Order} enum. |
| */ |
| @Override |
| public abstract Order reversed(); |
| } |