过滤器模式（Filter Pattern）或标准模式（Criteria Pattern）是一种设计模式，这种模式允许开发人员使用不同的标准来过滤一组对象，通过逻辑运算以解耦的方式把它们连接起来
Class Diagram
Implementation
过滤器接口
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| public interface Filter {
<T> List<T> doFilter(List<T> list);
}
|
具体过滤器
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| public class ConcreteFilterA implements Filter {
@Override
public <T> List<T> doFilter(List<T> list) {
final List<T> result = new ArrayList<>();
list.forEach((item)->{
if(!item.equals("a")){
result.add(item);
}
});
return result;
}
}
public class ConcreteFilterB implements Filter {
@Override
public <T> List<T> doFilter(List<T> list) {
final List<T> result = new ArrayList<>();
list.forEach((item)->{
if(!item.equals("b")){
result.add(item);
}
});
return result;
}
}
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测试类
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| public class FilterTest {
List<String> stringList = new ArrayList<>();
List<Filter> filterList = new ArrayList<>();
@Before
public void init(){
stringList.add("a");
stringList.add("b");
stringList.add("c");
stringList.add("d");
filterList.add(new ConcreteFilterA());
filterList.add(new ConcreteFilterB());
}
@Test
public void test() throws Exception{
filterList.forEach((filter -> {
List<String> result = filter.doFilter(stringList);
System.out.println("Filter"+filter.getClass().getSimpleName()+" : "+result.toString());
}));
}
}
|
Example
Reflence