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@@ -0,0 +1,83 @@
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+/*
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+ * Copyright 2002-2019 the original author or authors.
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+ *
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+ * Licensed under the Apache License, Version 2.0 (the "License");
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+ * you may not use this file except in compliance with the License.
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+ * You may obtain a copy of the License at
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+ *
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+ * https://www.apache.org/licenses/LICENSE-2.0
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+ *
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+ * Unless required by applicable law or agreed to in writing, software
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+ * distributed under the License is distributed on an "AS IS" BASIS,
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+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ * See the License for the specific language governing permissions and
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+ * limitations under the License.
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+ */
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+
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+package cn.hutool.core.comparator;
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+
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+import cn.hutool.core.lang.Assert;
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+
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+import java.util.Comparator;
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+
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+/**
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+ * 按照指定类型顺序排序,对象顺序取决于对象对应的类在数组中的位置。
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+ *
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+ * <p>如果对比的两个对象类型相同,返回{@code 0},默认如果对象类型不在列表中,则排序在前</p>
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+ * <p>此类来自Spring,有所改造</p>
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+ *
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+ * @param <T> 用于比较的对象类型
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+ * @author Phillip Webb
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+ * @since 5.4.1
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+ */
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+public class InstanceComparator<T> implements Comparator<T> {
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+
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+ private final boolean atEndIfMiss;
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+ private final Class<?>[] instanceOrder;
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+
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+ /**
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+ * 构造
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+ *
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+ * @param instanceOrder 用于比较排序的对象类型数组,排序按照数组位置排序
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+ */
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+ public InstanceComparator(Class<?>... instanceOrder) {
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+ this(false, instanceOrder);
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+ }
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+
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+ /**
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+ * 构造
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+ *
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+ * @param atEndIfMiss 如果不在列表中是否排在后边
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+ * @param instanceOrder 用于比较排序的对象类型数组,排序按照数组位置排序
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+ */
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+ public InstanceComparator(boolean atEndIfMiss, Class<?>... instanceOrder) {
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+ Assert.notNull(instanceOrder, "'instanceOrder' array must not be null");
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+ this.atEndIfMiss = atEndIfMiss;
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+ this.instanceOrder = instanceOrder;
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+ }
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+
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+
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+ @Override
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+ public int compare(T o1, T o2) {
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+ int i1 = getOrder(o1);
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+ int i2 = getOrder(o2);
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+ return Integer.compare(i1, i2);
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+ }
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+
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+ /**
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+ * 查找对象类型所在列表的位置
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+ *
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+ * @param object 对象
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+ * @return 位置,未找到位置根据{@link #atEndIfMiss}取不同值,false返回-1,否则返回列表长度
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+ */
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+ private int getOrder(T object) {
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+ if (object != null) {
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+ for (int i = 0; i < this.instanceOrder.length; i++) {
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+ if (this.instanceOrder[i].isInstance(object)) {
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+ return i;
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+ }
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+ }
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+ }
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+ return this.atEndIfMiss ? this.instanceOrder.length : -1;
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+ }
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+}
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