NutActionChain.java

package org.nutz.mvc.impl;

import java.lang.reflect.Method;
import java.util.Iterator;
import java.util.List;

import org.nutz.lang.Lang;
import org.nutz.mvc.ActionChain;
import org.nutz.mvc.ActionContext;
import org.nutz.mvc.ActionInfo;
import org.nutz.mvc.Processor;

public class NutActionChain implements ActionChain {

    private Processor head;

    private Processor errorProcessor;
    
    private Method method;
    
    private Integer lineNumber;

    public NutActionChain(List<Processor> list, Processor errorProcessor, ActionInfo ai) {
        if (null != list) {
            Iterator<Processor> it = list.iterator();
            if (it.hasNext()) {
                head = it.next();
                Processor p = head;
                while (it.hasNext()) {
                    Processor next = it.next();
                    p.setNext(next);
                    p = next;
                }
            }
        }
        this.errorProcessor = errorProcessor;
        this.method = ai.getMethod();
        this.lineNumber = ai.getLineNumber();
    }

    public void doChain(ActionContext ac) {
        if (null != head)
            try {
                head.process(ac);
            }
            catch (Throwable e) {
                ac.setError(e);
                try {
                    errorProcessor.process(ac);
                }
                catch (Throwable ee) {
                    throw Lang.wrapThrow(ee);
                }
        }
    }

    
    String methodStr;
    public String toString() {
        if (methodStr == null) {
            if (lineNumber != null) {
                String className = method.getDeclaringClass().getSimpleName();
                String methodName = method.getName();
                methodStr = String.format("%s.%s(%s.java:%d)", className, methodName, className, lineNumber);
            } else {
                methodStr = Lang.simpleMethodDesc(method);
            }
        }
        return methodStr;
    }
}