adapter

Simpler use of TypeAdapterFactory

前提是你 提交于 2019-12-30 04:18:06
问题 AFAIK the most flexible gson customization is possible via TypeAdapterFactory , however it may get needlessly complicated. It forces me to write for each handled class both read and write , while sometimes only one method is really needed. Moreover, sometimes a JsonSerializer and/or JsonDeserializer were much easier to write, e.g. like here. This leads me to these questions: Is it possible to write a TypeAdapter which simply delegates one of its methods (e.g. writing of ImmutableList to

C++设计模式-Adapter适配器模式

不问归期 提交于 2019-12-30 02:58:42
Adapter适配器模式 作用 :将一个类的接口转换成客户希望的另外一个接口。Adapter模式使得原本由于接口不兼容而不能一起工作的那些类可以一起工作。 分为类适配器模式和对象适配器模式。 系统的数据和行为都正确,但接口不符时,我们应该考虑使用适配器,目的是使控制范围之外的一个原有对象与某个接口匹配。适配器模式主要应用于希望复用一些现存的类,但是接口又与复用环境要求不一致的情况。 想使用一个已经存在的类,但如果它的接口,也就是它的方法和你的要求不相同时,就应该考虑用适配器模式。 比如购买的第三方开发组件,该组件接口与我们自己系统的接口不相同,或者由于某种原因无法直接调用该组件,可以考虑适配器。 UML图如下: 图1:类模式适配器 图2:对象模式适配器 代码如下: Adapter.h 1 #ifndef _ADAPTER_H_ 2 #define _ADAPTER_H_ 3 4 //目标接口类,客户需要的接口 5 class Target 6 { 7 public: 8 Target(); 9 virtual ~Target(); 10 virtual void Request();//定义标准接口 11 }; 12 13 //需要适配的类 14 class Adaptee 15 { 16 public: 17 Adaptee(); 18 ~Adaptee(); 19 void

设计模式笔记:适配器模式(Adapter)

感情迁移 提交于 2019-12-30 02:55:59
1. 适配器模式简介 1.1 模式定义   适配器模式:通过一个类的接口转换成客户希望的另外一个接口, 使原本由于接口不兼容而不能一起工作的那些类可以一起工作 。    适配器从结构上分为:类适配器和对象适配器。 其中 类适配器使用继承关系 来对类进行适配, 对象适配器使用对象引用 来进行适配。   C#实现类适配器时,Target只能是接口。实现对象适配器时,Target可以是抽象类也可以是接口。 1.2 使用频率    中高 2. 类适配器模式结构 2.1 结构图 2.1.1 类适配器结构图 2.1.2 对象适配器结构图 2.2 参与者   适配器模式参与者:   ◊ Target:Client所使用的目标接口,可以是接口或抽象类。由于C#不支持多类继承,故把Target定义为接口。   ◊ Adaptee:需要适配的类接口。   ◊ Adapter:适配器,负责Adaptee的接口与Target接口进行适配。   ◊ Client:与符合Target接口的对象协调的类。   在适配器模式中,类Adapter实现适配器的功能,它在Client与Adaptee之间加入Adapter,这样Client把请求发给接口为Target的类Adapter,再由Adapter调用Adaptee,从而实现Client调用Adaptee。 3. 适配器模式结构实现 3.1 类适配器结构实现  

设计模式之Adapter模式

落花浮王杯 提交于 2019-12-30 02:52:20
说起Adapter,STL里的stack和queue都是adapter,底层是deque,隐藏了deque的一些接口,使得其可以达到FIFO是queue,LIFO是stack。 The STL stack is a container adaptor. That is, it is not a "first-class" container, but instead simply "adapts" one of the sequential first-class containers (by default, the deque) for its own purposes. So, the deque interface is restricted (i.e., much of it is hidden) so that the required LIFO (Last In, First Out) stack-like behavior is provided. 再说通透一点,adapter就是适配器,电源适配器知道吧,把220v交流电转换为笔记本可接受的电压和电流就是我们常见的电源适配器,手机电源适配器等等。 还有STL里本来就有一类叫做adapter,有容器adapter即stack和queue,还有迭代器的adapter,有insert iterators,reverse

type error: cannot call method 'invoke procedure' of undefined in worklight

♀尐吖头ヾ 提交于 2019-12-29 09:50:21
问题 this is my js function... var invocationData={ adapter : 'Health_Care', procedure: 'update', parameters:[uname,cp,np] }; WL.Client.invokeProcedure(invocationData, { onSuccess: function(){ alert("Password successfully changed"); }, onFailure: function(){ alert("failed"); } } ); my adapter is... var updateStatement = WL.Server.createSQLStatement("UPDATE EMPLOYEE SET PASSWORD=? WHERE UID=? AND PASSWORD=?"); function update(pid,curP,newP) { return WL.Server.invokeSQLStatement({ preparedStatement

Update City Spinner with notifyDataSetChanged after state is selected

…衆ロ難τιáo~ 提交于 2019-12-29 08:40:22
问题 How do I update my city spinner once the user selects a state? Both fields are populated using a DataCall.class that returns JSON data and parses the info into an array for the spinner. My code below sets the city adapter to a defualt "Select State" value and once the user gets selects the state it should use notifyDataSetChanged since the default array for the city spinner is updated with the new city names. The errors I am getting are commented in my code below. public class SearchActivity

EditText Loses Focus on Click

☆樱花仙子☆ 提交于 2019-12-29 07:06:21
问题 I'm writing an activity to list a bunch of items from the database and show an additional column with a quantity. I implemented an ArrayAdapter to show my custom layout. Here is the code of the most important parts of the Adapter: static class ViewHolder { protected TextView text; protected EditText editText; } @Override public View getView(int position, View convertView, ViewGroup parent) { View view = null; if (convertView == null) { LayoutInflater inflator = context.getLayoutInflater();

What is the right way to communicate from a custom View to the Activity in which it resides?

谁说胖子不能爱 提交于 2019-12-28 13:46:10
问题 I have a custom View class that extends Spinner. I'm trying to figure out what the correct way to talk to the Activity that it's embedded in is, when the user makes a selection. I see that the OnItemSelected listener gets a reference to the Adapter, but I'm not clear on whether or not I should be using this adapter and walking up its parent chain somehow, or if I should just talk directly to the context (for some reason that doesn't feel safe, even though I can't think of a way in which it

How to obtain the checked rows in a custom view list

寵の児 提交于 2019-12-28 06:54:10
问题 Can any one tell me how can i obtain the values of the checked rows in a custom view list? For example my code has a custom view list with two text view and a checkbox. Whenever the user checks a row and hits the submit button i need to retrieve the information in the two textview.. The code is public class contacts extends Activity implements OnItemClickListener { static final String TAG = "contacts"; ArrayList<String> contactName = new ArrayList<String>(); ArrayList<String> contactNumber =

GetView Vs. BindView in a custom CursorAdapter?

雨燕双飞 提交于 2019-12-27 16:41:04
问题 So, I'm watching this video http://www.youtube.com/watch?v=N6YdwzAvwOA and Romain Guy is showing how to make more efficient UI adapter code using the getView() method. Does this apply to CursorAdapters as well? I'm currently using bindView() and newView() for my custom cursor adapters. Should I be using getView instead? 回答1: CursorAdapter has an implementation of getView() that delegates to newView() and bindView() , in such a way as enforces the row recycling pattern. Hence, you do not need