jfinal enjoy 3.5

2018-10-04 21:38:21 +08:00
parent 49d53e9f55
commit 13f2d302c3
24 changed files with 763 additions and 181 deletions
--- a/src/main/java/com/jfinal/template/expr/ast/FieldGetters.java
+++ b/src/main/java/com/jfinal/template/expr/ast/FieldGetters.java
@@ -0,0 +1,270 @@
+/**
+ * Copyright (c) 2011-2019, James Zhan 詹波 (jfinal@126.com).
+ *
+ * Licensed 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 com.jfinal.template.expr.ast;
+
+import java.lang.reflect.Array;
+import com.jfinal.kit.StrKit;
+
+/**
+ * FieldGetters 封装官方默认 FieldGetter 实现
+ */
+public class FieldGetters {
+	
+	/**
+	 * NullFieldGetter
+	 * 
+	 * 用于消除 FieldKit.getFieldGetter(...) 中的 instanceof 判断，并且让 Map fieldGetterCache
+	 * 中的 value 不必使用 Object 类型。还消除了 Field.exec(...) 中的 null 值判断
+	 */
+	public static class NullFieldGetter extends FieldGetter {
+		
+		public static final NullFieldGetter me = new NullFieldGetter();
+		
+		public boolean notNull() {
+			return false;
+		}
+		
+		public FieldGetter takeOver(Class<?> targetClass, String fieldName) {
+			throw new RuntimeException("The method takeOver(Class, String) of NullFieldGetter should not be invoked");
+		}
+		
+		public Object get(Object target, String fieldName) throws Exception {
+			throw new RuntimeException("The method get(Object, String) of NullFieldGetter should not be invoked");
+		}
+	}
+	
+	/**
+	 * GetterMethodFieldGetter
+	 * 
+	 * 使用 getter 方法获取 target.field 表达式的值
+	 */
+	public static class GetterMethodFieldGetter extends FieldGetter {
+		
+		protected java.lang.reflect.Method getterMethod;
+		
+		public GetterMethodFieldGetter(java.lang.reflect.Method getterMethod) {
+			this.getterMethod = getterMethod;
+		}
+		
+		public FieldGetter takeOver(Class<?> targetClass, String fieldName) {
+			if (MethodKit.isForbiddenClass(targetClass)) {
+				throw new RuntimeException("Forbidden class: " + targetClass.getName());
+			}
+			
+			String getterName = "get" + StrKit.firstCharToUpperCase(fieldName);
+			java.lang.reflect.Method[] methodArray = targetClass.getMethods();
+			for (java.lang.reflect.Method method : methodArray) {
+				if (method.getName().equals(getterName) && method.getParameterTypes().length == 0) {
+					if (MethodKit.isForbiddenMethod(getterName)) {
+						throw new RuntimeException("Forbidden method: " + getterName);
+					}
+					
+					return new GetterMethodFieldGetter(method);
+				}
+			}
+			
+			return null;
+		}
+		
+		public Object get(Object target, String fieldName) throws Exception {
+			return getterMethod.invoke(target, ExprList.NULL_OBJECT_ARRAY);
+		}
+		
+		public String toString() {
+			return getterMethod.toString();
+		}
+	}
+	
+	/**
+	 * IsMethodFieldGetter
+	 * 
+	 * 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：
+	 * Engine.addLastFieldGetter(new FieldGetters.IsMethodFieldGetter());
+	 */
+	public static class IsMethodFieldGetter extends FieldGetter {
+		
+		protected java.lang.reflect.Method isMethod;
+		
+		// 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
+		public IsMethodFieldGetter() {
+		}
+		
+		public IsMethodFieldGetter(java.lang.reflect.Method isMethod) {
+			this.isMethod = isMethod;
+		}
+		
+		public FieldGetter takeOver(Class<?> targetClass, String fieldName) {
+			if (MethodKit.isForbiddenClass(targetClass)) {
+				throw new RuntimeException("Forbidden class: " + targetClass.getName());
+			}
+			
+			String isMethodName = "is" + StrKit.firstCharToUpperCase(fieldName);
+			java.lang.reflect.Method[] methodArray = targetClass.getMethods();
+			for (java.lang.reflect.Method method : methodArray) {
+				if (method.getName().equals(isMethodName) && method.getParameterTypes().length == 0) {
+					Class<?> returnType = method.getReturnType();
+					if (returnType == Boolean.class || returnType == boolean.class) {
+						return new IsMethodFieldGetter(method);
+					}
+				}
+			}
+			
+			return null;
+		}
+		
+		public Object get(Object target, String fieldName) throws Exception {
+			return isMethod.invoke(target, ExprList.NULL_OBJECT_ARRAY);
+		}
+		
+		public String toString() {
+			return isMethod.toString();
+		}
+	}
+	
+	/**
+	 * ModelFieldGetter
+	 * 
+	 * 使用 Model.get(String) 获取值
+	
+	public static class ModelFieldGetter extends FieldGetter {
+		
+		// 所有 Model 可以共享 ModelFieldGetter 获取属性
+		static final ModelFieldGetter singleton = new ModelFieldGetter();
+		
+		public FieldGetter takeOver(Class<?> targetClass, String fieldName) {
+			if (com.jfinal.plugin.activerecord.Model.class.isAssignableFrom(targetClass)) {
+				return singleton;
+			} else {
+				return null;
+			}
+		}
+		
+		public Object get(Object target, String fieldName) throws Exception {
+			return ((com.jfinal.plugin.activerecord.Model<?>)target).get(fieldName);
+		}
+	} */
+	
+	/**
+	 * RecordFieldGetter
+	 * 
+	 * 使用 Record.get(String) 获取值
+	
+	public static class RecordFieldGetter extends FieldGetter {
+		
+		// 所有 Record 可以共享 RecordFieldGetter 获取属性
+		static final RecordFieldGetter singleton = new RecordFieldGetter();
+		
+		public FieldGetter takeOver(Class<?> targetClass, String fieldName) {
+			if (com.jfinal.plugin.activerecord.Record.class.isAssignableFrom(targetClass)) {
+				return singleton;
+			} else {
+				return null;
+			}
+		}
+		
+		public Object get(Object target, String fieldName) throws Exception {
+			return ((com.jfinal.plugin.activerecord.Record)target).get(fieldName);
+		}
+	} */
+	
+	/**
+	 * MapFieldGetter
+	 * 
+	 * 使用 Map.get(Object) 获取值
+	 */
+	public static class MapFieldGetter extends FieldGetter {
+		
+		// 所有 Map 可以共享 MapFieldGetter 获取属性
+		static final MapFieldGetter singleton = new MapFieldGetter();
+		
+		public FieldGetter takeOver(Class<?> targetClass, String fieldName) {
+			if (java.util.Map.class.isAssignableFrom(targetClass)) {
+				return singleton;
+			} else {
+				return null;
+			}
+		}
+		
+		public Object get(Object target, String fieldName) throws Exception {
+			return ((java.util.Map<?, ?>)target).get(fieldName);
+		}
+	}
+	
+	/**
+	 * RealFieldGetter
+	 * 
+	 * 使用 target.field 获取值
+	 */
+	public static class RealFieldGetter extends FieldGetter {
+		
+		protected java.lang.reflect.Field field;
+		
+		public RealFieldGetter(java.lang.reflect.Field field) {
+			this.field = field;
+		}
+		
+		public FieldGetter takeOver(Class<?> targetClass, String fieldName) {
+			java.lang.reflect.Field[] fieldArray = targetClass.getFields();
+			for (java.lang.reflect.Field field : fieldArray) {
+				if (field.getName().equals(fieldName)) {
+					return new RealFieldGetter(field);
+				}
+			}
+			
+			return null;
+		}
+		
+		public Object get(Object target, String fieldName) throws Exception {
+			return field.get(target);
+		}
+		
+		public String toString() {
+			return field.toString();
+		}
+	}
+	
+	/**
+	 * ArrayLengthGetter
+	 * 
+	 * 获取数组长度： array.length
+	 */
+	public static class ArrayLengthGetter extends FieldGetter {
+		
+		// 所有数组可以共享 ArrayLengthGetter 获取属性
+		static final ArrayLengthGetter singleton = new ArrayLengthGetter();
+		
+		public FieldGetter takeOver(Class<?> targetClass, String fieldName) {
+			if ("length".equals(fieldName) && targetClass.isArray()) {
+				return singleton;
+			} else {
+				return null;
+			}
+		}
+		
+		public Object get(Object target, String fieldName) throws Exception {
+			return Array.getLength(target);
+		}
+	}
+}
+
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