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• GojaErrorRender.java

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goja.mvc.error.GojaErrorRender Maven / Gradle / Ivy

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2013-2014 sagyf Yang. The Four Group.
 */

package goja.mvc.error;

import goja.core.StringPool;
import goja.mvc.Freemarkers;
import com.jfinal.core.Const;
import com.jfinal.core.JFinal;
import com.jfinal.render.Render;
import com.jfinal.render.RenderException;
import com.jfinal.render.RenderFactory;

import com.google.common.base.Splitter;
import com.google.common.base.Throwables;
import com.google.common.collect.Maps;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import java.util.Map;

import static javax.servlet.http.HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
import static javax.servlet.http.HttpServletResponse.SC_NOT_FOUND;

/**
 * 
 . 
 *
 * @author sagyf yang
 * @version 1.0 2014-11-08 20:54
 * @since JDK 1.6
 */
public class GojaErrorRender extends Render {

    public static final    String ERROR_500_FTL =
            "
Execution exception
 ${title!} 
Exception information in detail 
<#list errors as er>
error\">${er_index + 1}:
${er}
";
    public static final    String NOTFUND_FTL   =
            "
${requestURI!}  Not found
These routes have been tried, in this order :
<#list routes as r>
 ${r} 
";
    protected static final String contentType   = "text/html; charset=" + getEncoding();
    protected static final String version       =
            "Powered by JFinal#Goja "
                    + Const.JFINAL_VERSION
                    + "";
    protected int errorCode;

    public GojaErrorRender(int errorCode, String view) {
        this.errorCode = errorCode;
        this.view = view;
    }

    public void render() {
        response.setStatus(getErrorCode());    // HttpServletResponse.SC_XXX_XXX

        // render with view
        String view = getView();
        if (view != null) {
            RenderFactory.me().getRender(view).setContext(request, response).render();
            return;
        }

        // render with html content
        PrintWriter writer = null;
        try {
            response.setContentType(contentType);
            writer = response.getWriter();
            writer.write(getErrorHtml());
            writer.flush();
        } catch (IOException e) {
            throw new RenderException(e);
        } finally {
            if (writer != null) {
                writer.close();
            }
        }
    }

    public String getErrorHtml() {
        int errorCode = getErrorCode();
        Map pdata = Maps.newHashMap();
        final String requestURI = request.getRequestURI();
        pdata.put("requestURI", requestURI);
        switch (errorCode) {
            case SC_INTERNAL_SERVER_ERROR:
                Throwable te = (Throwable) request.getAttribute("goja_error");
                String error_msg = Throwables.getStackTraceAsString(te);
                List error_lines = Splitter.on(StringPool.NEWLINE).splitToList(error_msg);
                pdata.put("title", error_lines.get(0));
                pdata.put("errors", error_lines);
                return Freemarkers.renderStrTemplate(ERROR_500_FTL, pdata);
            case SC_NOT_FOUND:
                final List allActionKeys = JFinal.me().getAllActionKeys();
                pdata.put("routes", allActionKeys);
                return Freemarkers.renderStrTemplate(NOTFUND_FTL, pdata);
            default:
                return "
"
                        + errorCode
                        + " Error
"
                        + version
                        + "";
        }
    }

    public int getErrorCode() {
        return errorCode;
    }
}