Quadcap Embeddable Server

com/quadcap/http/servlets/jsp/TagJspRoot.java

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package com.quadcap.http.servlets.jsp;

/* Copyright 1999 - 2003 Quadcap Software.  All rights reserved.
 *
 * This software is distributed under the Quadcap Free Software License.
 * This software may be used or modified for any purpose, personal or
 * commercial.  Open Source redistributions are permitted.  Commercial
 * redistribution of larger works derived from, or works which bundle
 * this software requires a "Commercial Redistribution License"; see
 * http://www.quadcap.com/purchase.
 *
 * Redistributions qualify as "Open Source" under  one of the following terms:
 *   
 *    Redistributions are made at no charge beyond the reasonable cost of
 *    materials and delivery.
 *
 *    Redistributions are accompanied by a copy of the Source Code or by an
 *    irrevocable offer to provide a copy of the Source Code for up to three
 *    years at the cost of materials and delivery.  Such redistributions
 *    must allow further use, modification, and redistribution of the Source
 *    Code under substantially the same terms as this license.
 *
 * Redistributions of source code must retain the copyright notices as they
 * appear in each source code file, these license terms, and the
 * disclaimer/limitation of liability set forth as paragraph 6 below.
 *
 * Redistributions in binary form must reproduce this Copyright Notice,
 * these license terms, and the disclaimer/limitation of liability set
 * forth as paragraph 6 below, in the documentation and/or other materials
 * provided with the distribution.
 *
 * The Software is provided on an "AS IS" basis.  No warranty is
 * provided that the Software is free of defects, or fit for a
 * particular purpose.  
 *
 * Limitation of Liability. Quadcap Software shall not be liable
 * for any damages suffered by the Licensee or any third party resulting
 * from use of the Software.
 */

import java.io.CharArrayWriter;
import java.io.IOException;
import java.io.PrintWriter;

import java.util.Enumeration;

import org.xml.sax.AttributeList;

import com.quadcap.util.Debug;

/**
 * The pseudo tag <b>&lt;jsp:root&gt;</b>.
 *
 * @author Stan Bailes
 */
public class TagJspRoot extends TagJsp {
    CharArrayWriter             cw              = null;
    PrintWriter                 w               = null;
    PrintWriter                 ow              = null;
    AttributeList               attributes      = null;

    public TagJspRoot() {}

    public TagJspRoot(TagContext context) {
        super(context);
    }

    public TagInstance makeInstance(TagContext context) {
        return new TagJspRoot(context);
    }

    public void doStartTag(String tagName, AttributeList attributes)
        throws JspException
    {
        super.doStartTag(tagName, attributes);
        cw = new CharArrayWriter();
        w = new PrintWriter(cw);
        ow = context.pushPrintWriter(w);
        this.attributes = attributes;
    }

    public void writeProlog(PrintWriter w) {
        w.print("package ");
        w.print(context.getPackageName());
        w.println(";");
        w.println("//This code auto-generated");
        w.println("");
        w.println("import java.io.IOException;");
        w.println("");
        w.println("import javax.servlet.jsp.HttpJspPage;");
        w.println("import javax.servlet.jsp.JspFactory;");
        w.println("import javax.servlet.jsp.JspWriter;");
        w.println("import javax.servlet.jsp.PageContext;");
        w.println("");
        w.println("import javax.servlet.ServletConfig;");
        w.println("import javax.servlet.ServletContext;");
        w.println("import javax.servlet.ServletException;");
        w.println("");
        w.println("import javax.servlet.http.HttpServletRequest;");
        w.println("import javax.servlet.http.HttpServletResponse;");
        w.println("import javax.servlet.http.HttpSession;");
        w.println("");
        Enumeration imports = context.getPageDirectives("import");
        while (imports.hasMoreElements()) {
            w.print("import ");
            w.print(imports.nextElement().toString());
            w.println(";");
        }
        w.println("");
        w.print("public class ");
        w.print(context.getClassName());

        String extendsStr = 
            context.getPageDirective("extends",
                                     "com.quadcap.http.servlets.jsp.JspPage");
        w.print(" extends ");
        w.print(extendsStr);

        if (context.getPageDirective("isThreadSafe", "true").equals("false")) {
           w.print(" implements javax.servlet.SingleThreadModel");
        }   
        w.println(" {");

        w.print("    public ");
        w.print(context.getClassName());
        w.println("() {}");
        w.println();

        Enumeration declarations = context.getPageDirectives("declarations");
        while (declarations.hasMoreElements()) {
            w.println(declarations.nextElement());
        }
        w.println();

        String info = context.getPageDirective("info");
        if (info != null && info.length() > 0) {
            w.println("    public String getServletInfo() {");
            w.print("        return \"");
            w.print(info);
            w.println("\");");
            w.println();
        }


        w.print("    public void _jspService(HttpServletRequest request,");
        w.print(" HttpServletResponse response) throws ServletException, ");
        w.println(" IOException {");

        w.println("        JspFactory factory = JspFactory.getDefaultFactory();");
        w.println("        PageContext pageContext = factory.getPageContext(");
        w.print("            this, request, response, ");
        String err = context.getPageDirective("errorPage");
        if (err == null) {
            err = "null";
        } else {
            err = "\"" + err + "\"";
        }
        w.print(err);
        w.println(", false,");

        String b = context.getPageDirective("buffer", "8kb");
        int mul = 1;
        if (b.endsWith("kb")) {
            b = b.substring(0, b.length() - 2);
            mul = 1024;
        }
        int bufSize = Integer.parseInt(b) * mul;
        w.print("            ");
        w.print(String.valueOf(bufSize));
        w.print(", ");

        String autoFlush = context.getPageDirective("autoFlush", "true");
        w.print(autoFlush);
        w.println(");");

        String s = context.getPageDirective("session");
        if (s == null || !s.equals("false")) {
            w.println("        HttpSession session = pageContext.getSession();");
        }

        s = context.getPageDirective("isErrorPage");
        if (s != null && s.equals("true")) {
            w.println("        Exception exception = pageContext.getException();");
        }

        w.println("        JspWriter out = pageContext.getOut();");
        w.println("        Object page = this;");
        w.println("        ServletContext application = pageContext.getServletContext();");
        w.println("        ServletConfig config = pageContext.getServletConfig();");

        s = context.getPageDirective("contentType");
        if (s != null && s.length() > 0) {
            w.print("        response.setContentType(\"");
            w.print(s);
            w.print("\");");
        }
        w.println("        try {");
    }

    public void doEndTag() throws JspException {
        w.flush();
        writeProlog(ow);
        try {
            cw.writeTo(ow);
        } catch (IOException e) {
            Debug.print(e);
            throw new JspException(e.toString());
        }
        doEpilog(ow);
        context.popPrintWriter();
    }

    void doEpilog(PrintWriter w) {
        w.println("        } catch (Exception e) {");
        w.println("            out.clear();");
        w.println("            pageContext.handlePageException(e);");
//      w.println("        } finally {");
//      w.println("            out.flush();");
        w.println("        }");
        w.println("    }");
        w.println("}");
    }

    public void doCharacters(char[] ch, int off, int cnt) throws JspException {
        PrintWriter w = context.getPrintWriter();

        w.print("out.print(\"");
        for (int i = 0; i < cnt; i++) {
            char c = ch[off + i];
            switch (c) {
            case '\n':
                w.print("\\n");
                break;
            case '\r':
                w.print("\\r");
                break;
            case '\t':
                w.print("\\t");
                break;
            case '\'':
                w.print("\\'");
                break;
            case '\"':
                w.print("\\\"");
                break;
            case '\\':
                w.print("\\\\");
                break;
            default:
                if (c > 0xfff) {
                    w.print("\\u");
                    w.print(Integer.toHexString(c));
                } else if (c > 0xff) {
                    w.print("\\u0");
                    w.print(Integer.toHexString(c));
                } else if (c <= 0x1f || c >= 0xf7f) {
                    w.print("\\u00");
                    w.print(Integer.toHexString(c));
                } else {
                    w.print((char)c);
                }
            }
        }
        w.println("\");");
    }
}