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@@ -0,0 +1,270 @@
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+/**
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+ * Copyright (c) 2011-2019, James Zhan 詹波 (jfinal@126.com).
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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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+ * http://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 com.jfinal.template.expr.ast;
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+
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+import java.lang.reflect.Array;
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+import com.jfinal.kit.StrKit;
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+
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+/**
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+ * FieldGetters 封装官方默认 FieldGetter 实现
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+ */
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+public class FieldGetters {
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+
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+ /**
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+ * NullFieldGetter
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+ *
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+ * 用于消除 FieldKit.getFieldGetter(...) 中的 instanceof 判断,并且让 Map fieldGetterCache
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+ * 中的 value 不必使用 Object 类型。还消除了 Field.exec(...) 中的 null 值判断
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+ */
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+ public static class NullFieldGetter extends FieldGetter {
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+
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+ public static final NullFieldGetter me = new NullFieldGetter();
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+
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+ public boolean notNull() {
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+ return false;
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+ }
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+
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+ public FieldGetter takeOver(Class<?> targetClass, String fieldName) {
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+ throw new RuntimeException("The method takeOver(Class, String) of NullFieldGetter should not be invoked");
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+ }
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+
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+ public Object get(Object target, String fieldName) throws Exception {
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+ throw new RuntimeException("The method get(Object, String) of NullFieldGetter should not be invoked");
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+ }
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+ }
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+
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+ /**
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+ * GetterMethodFieldGetter
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+ *
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+ * 使用 getter 方法获取 target.field 表达式的值
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+ */
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+ public static class GetterMethodFieldGetter extends FieldGetter {
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+
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+ protected java.lang.reflect.Method getterMethod;
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+
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+ public GetterMethodFieldGetter(java.lang.reflect.Method getterMethod) {
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+ this.getterMethod = getterMethod;
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+ }
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+
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+ public FieldGetter takeOver(Class<?> targetClass, String fieldName) {
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+ if (MethodKit.isForbiddenClass(targetClass)) {
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+ throw new RuntimeException("Forbidden class: " + targetClass.getName());
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+ }
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+
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+ String getterName = "get" + StrKit.firstCharToUpperCase(fieldName);
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+ java.lang.reflect.Method[] methodArray = targetClass.getMethods();
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+ for (java.lang.reflect.Method method : methodArray) {
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+ if (method.getName().equals(getterName) && method.getParameterTypes().length == 0) {
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+ if (MethodKit.isForbiddenMethod(getterName)) {
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+ throw new RuntimeException("Forbidden method: " + getterName);
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+ }
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+
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+ return new GetterMethodFieldGetter(method);
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+ }
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+ }
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+
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+ return null;
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+ }
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+
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+ public Object get(Object target, String fieldName) throws Exception {
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+ return getterMethod.invoke(target, ExprList.NULL_OBJECT_ARRAY);
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+ }
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+
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+ public String toString() {
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+ return getterMethod.toString();
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+ }
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+ }
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+
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+ /**
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+ * IsMethodFieldGetter
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+ *
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+ * 使用 target.isXxx() 方法获取值,默认不启用该功能,用户可以通过如下方式启用:
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+ * Engine.addLastFieldGetter(new FieldGetters.IsMethodFieldGetter(null));
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+ */
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+ public static class IsMethodFieldGetter extends FieldGetter {
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+
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+ protected java.lang.reflect.Method isMethod;
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+
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+ // 此构造方法仅为了方便在 Engine.addFieldGetter(...) 添加时不用为构造方法传参
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+ public IsMethodFieldGetter() {
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+ }
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+
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+ public IsMethodFieldGetter(java.lang.reflect.Method isMethod) {
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+ this.isMethod = isMethod;
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+ }
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+
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+ public FieldGetter takeOver(Class<?> targetClass, String fieldName) {
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+ if (MethodKit.isForbiddenClass(targetClass)) {
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+ throw new RuntimeException("Forbidden class: " + targetClass.getName());
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+ }
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+
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+ String isMethodName = "is" + StrKit.firstCharToUpperCase(fieldName);
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+ java.lang.reflect.Method[] methodArray = targetClass.getMethods();
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+ for (java.lang.reflect.Method method : methodArray) {
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+ if (method.getName().equals(isMethodName) && method.getParameterTypes().length == 0) {
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+ Class<?> returnType = method.getReturnType();
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+ if (returnType == Boolean.class || returnType == boolean.class) {
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+ return new IsMethodFieldGetter(method);
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+ }
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+ }
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+ }
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+
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+ return null;
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+ }
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+
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+ public Object get(Object target, String fieldName) throws Exception {
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+ return isMethod.invoke(target, ExprList.NULL_OBJECT_ARRAY);
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+ }
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+
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+ public String toString() {
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+ return isMethod.toString();
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+ }
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+ }
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+
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+ /**
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+ * ModelFieldGetter
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+ *
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+ * 使用 Model.get(String) 获取值
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+ */
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+ public static class ModelFieldGetter extends FieldGetter {
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+
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+ // 所有 Model 可以共享 ModelFieldGetter 获取属性
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+ static final ModelFieldGetter singleton = new ModelFieldGetter();
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+
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+ public FieldGetter takeOver(Class<?> targetClass, String fieldName) {
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+ if (com.jfinal.plugin.activerecord.Model.class.isAssignableFrom(targetClass)) {
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+ return singleton;
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+ } else {
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+ return null;
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+ }
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+ }
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+
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+ public Object get(Object target, String fieldName) throws Exception {
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+ return ((com.jfinal.plugin.activerecord.Model<?>)target).get(fieldName);
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+ }
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+ }
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+
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+ /**
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+ * RecordFieldGetter
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+ *
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+ * 使用 Record.get(String) 获取值
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+ */
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+ public static class RecordFieldGetter extends FieldGetter {
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+
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+ // 所有 Record 可以共享 RecordFieldGetter 获取属性
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+ static final RecordFieldGetter singleton = new RecordFieldGetter();
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+
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+ public FieldGetter takeOver(Class<?> targetClass, String fieldName) {
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+ if (com.jfinal.plugin.activerecord.Record.class.isAssignableFrom(targetClass)) {
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+ return singleton;
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+ } else {
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+ return null;
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+ }
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+ }
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+
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+ public Object get(Object target, String fieldName) throws Exception {
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+ return ((com.jfinal.plugin.activerecord.Record)target).get(fieldName);
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+ }
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+ }
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+
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+ /**
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+ * MapFieldGetter
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+ *
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+ * 使用 Map.get(Object) 获取值
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+ */
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+ public static class MapFieldGetter extends FieldGetter {
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+
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+ // 所有 Map 可以共享 MapFieldGetter 获取属性
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+ static final MapFieldGetter singleton = new MapFieldGetter();
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+
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+ public FieldGetter takeOver(Class<?> targetClass, String fieldName) {
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+ if (java.util.Map.class.isAssignableFrom(targetClass)) {
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+ return singleton;
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+ } else {
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+ return null;
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+ }
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+ }
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+
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+ public Object get(Object target, String fieldName) throws Exception {
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+ return ((java.util.Map<?, ?>)target).get(fieldName);
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+ }
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+ }
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+
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+ /**
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+ * RealFieldGetter
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+ *
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+ * 使用 target.field 获取值
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+ */
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+ public static class RealFieldGetter extends FieldGetter {
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+
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+ protected java.lang.reflect.Field field;
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+
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+ public RealFieldGetter(java.lang.reflect.Field field) {
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+ this.field = field;
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+ }
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+
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+ public FieldGetter takeOver(Class<?> targetClass, String fieldName) {
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+ java.lang.reflect.Field[] fieldArray = targetClass.getFields();
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+ for (java.lang.reflect.Field field : fieldArray) {
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+ if (field.getName().equals(fieldName)) {
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+ return new RealFieldGetter(field);
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+ }
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+ }
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+
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+ return null;
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+ }
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+
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+ public Object get(Object target, String fieldName) throws Exception {
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+ return field.get(target);
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+ }
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+
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+ public String toString() {
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+ return field.toString();
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+ }
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+ }
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+
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+ /**
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+ * ArrayLengthGetter
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+ *
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+ * 获取数组长度: array.length
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+ */
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+ public static class ArrayLengthGetter extends FieldGetter {
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+
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+ // 所有数组可以共享 ArrayLengthGetter 获取属性
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+ static final ArrayLengthGetter singleton = new ArrayLengthGetter();
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+
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+ public FieldGetter takeOver(Class<?> targetClass, String fieldName) {
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+ if ("length".equals(fieldName) && targetClass.isArray()) {
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+ return singleton;
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+ } else {
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+ return null;
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+ }
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+ }
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+
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+ public Object get(Object target, String fieldName) throws Exception {
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+ return Array.getLength(target);
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+ }
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+ }
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+}
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+
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+
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+
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+
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+
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+
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+
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+
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