大家好哇,我是梦辛工作室的灵,在最近的开发中,有许多需要判断的分支处理,且处理内容较多且复杂,代码就容易越写越复杂,导致后期无法继续更新跌打,然后基于这个环境,我用责任链模式写了一个工具类用于解决这个问题,并将数据、判断、处理分隔开来,这样代码的重用性也增强了,下面来看下使用效果:
 
 使用方法如下:
 
 这里可自定义判断器和处理器,并自由组合,并链接起来,这里的判读器需实现一个检查方法,返回true 才会执行Handler的hand 方法,
 而处理器返回true的话,就表示不在继续往后判断了,返回false表示,代码还是会下一个判断器进行判断
 class  Data1Check implements IfCheck{
        @Override
        public boolean check(Object[] args) {
            if(args != null && args.length > 0 && "data1".equals(args[0])){
                System.out.println("Data1Check==>" + args[0] + "检查成功,处理");
                return true;
            }
            System.out.println("Data1Check==>" +  args[0] + "检查失败,不处理");
            return false;
        }
    }
    class Data1Handler implements IfHandler{
        @Override
        public boolean hand(Object[] args) {
            System.out.print(args[0]);
            System.out.println("已被Data1Handler处理");
            return false;
        }
    }
    class  Data2Check implements IfCheck{
        @Override
        public boolean check(Object[] args) {
            if(args != null && args.length > 0 && "data2".equals(args[0])){
                System.out.println("Data2Check==>" + args[0] + "检查成功,处理");
                return true;
            }
            System.out.println("Data2Check==>" + args[0] + "检查失败,不处理");
            return false;
        }
    }
    class Data2Handler implements IfHandler{
        @Override
        public boolean hand(Object[] args) {
            System.out.print(args[0]);
            System.out.println("已被Data2Handler处理");
            return true;
        }
    }
然后再来看下完整的代码:
 IfChain
public class IfChain {
    private IfChain nextChain;
    private Object[] args;
    private IfHandler handler;
    private IfCheck ifCheck;
    public IfChain(IfCheck ifCheck,IfHandler handler){
        this.ifCheck = ifCheck;
        this.handler = handler;
    }
    private boolean check(){
        if (ifCheck.check(args)){
            return handler.hand(args);
        }
        return false;
    }
    public IfCheck getIfCheck() {
        return ifCheck;
    }
    public void setIfCheck(IfCheck ifCheck) {
        this.ifCheck = ifCheck;
    }
    public IfChain getNextChain() {
        return nextChain;
    }
    public void setNextChain(IfChain nextChain) {
        this.nextChain = nextChain;
    }
    public Object[] getArgs() {
        return args;
    }
    public void setArgs(Object[] args) {
        this.args = args;
    }
    public IfHandler getHandler() {
        return handler;
    }
    public void setHandler(IfHandler handler) {
        this.handler = handler;
    }
    public void startCheck(){
        if (!check() && nextChain != null){
            nextChain.setArgs(args);
            nextChain.startCheck();
        }
    }
}
IfHandler
public interface IfHandler {
    boolean hand(Object[] args);
}
IfCheck
public interface IfCheck {
    boolean check(Object[] args);
}
TestIfChain
public class TestIfChain {
    class  Data1Check implements IfCheck{
        @Override
        public boolean check(Object[] args) {
            if(args != null && args.length > 0 && "data1".equals(args[0])){
                System.out.println("Data1Check==>" + args[0] + "检查成功,处理");
                return true;
            }
            System.out.println("Data1Check==>" +  args[0] + "检查失败,不处理");
            return false;
        }
    }
    class Data1Handler implements IfHandler{
        @Override
        public boolean hand(Object[] args) {
            System.out.print(args[0]);
            System.out.println("已被Data1Handler处理");
            return false;
        }
    }
    class  Data2Check implements IfCheck{
        @Override
        public boolean check(Object[] args) {
            if(args != null && args.length > 0 && "data2".equals(args[0])){
                System.out.println("Data2Check==>" + args[0] + "检查成功,处理");
                return true;
            }
            System.out.println("Data2Check==>" + args[0] + "检查失败,不处理");
            return false;
        }
    }
    class Data2Handler implements IfHandler{
        @Override
        public boolean hand(Object[] args) {
            System.out.print(args[0]);
            System.out.println("已被Data2Handler处理");
            return true;
        }
    }
    @Test
    public void doTest(){
        doCheck("data1");
        doCheck("data2");
        doCheck("data3");
    }
    private void doCheck(String data) {
        Object[] args = new Object[]{data};
        IfChain ifChainData1 = new IfChain(new Data1Check(),new Data1Handler());
        ifChainData1.setArgs(args);
        IfChain ifChainData2 = new IfChain(new Data2Check(),new Data2Handler());
        ifChainData2.setArgs(args);
        ifChainData1.setNextChain(ifChainData2);
        ifChainData1.startCheck();
    }
    private void doCheck2(String data){
        if("data1".equals(data)){
            System.out.println("data1已被Data1Handler");
            return;
        }
        if("data2".equals(data)){
            System.out.println("data1已被Data2Handler");
            return;
        }
    }
}
好了,今天的分享就到这里了
 github连接 https://github.com/wintton/MxTestSql.git



















