constants.java

JspRuntime自动填充机制；向对jsp深入了解的可以

/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:  
 *       "This product includes software developed by the 
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
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 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 *
 */ 

package studio.beansoft.jasper;

import java.util.ResourceBundle;
import java.util.MissingResourceException;
import java.text.MessageFormat;

/**
 * Some constants and other global data that are used by the compiler and the runtime.
 *
 * @author Anil K. Vijendran
 * @author Harish Prabandham
 */
public class Constants {
    /**
     * The base class of the generated servlets. 
     */
    public static final String JSP_SERVLET_BASE = "HttpJspBase";

    /**
     * _jspService is the name of the method that is called by 
     * HttpJspBase.service(). This is where most of the code generated
     * from JSPs go.
     */
    public static final String SERVICE_METHOD_NAME = "_jspService";

    /**
     * Default servlet content type.
     */
    public static final String SERVLET_CONTENT_TYPE = "text/html";

    /**
     * These classes/packages are automatically imported by the
     * generated code. 
     */
    public static final String[] STANDARD_IMPORTS = { 
	"javax.servlet.*", 
	"javax.servlet.http.*", 
	"javax.servlet.jsp.*", 
	"org.apache.jasper.runtime.*", 
    };

    /**
     * FIXME
     * ServletContext attribute for classpath. This is tomcat specific. 
     * Other servlet engines can choose to have this attribute if they 
     * want to have this JSP engine running on them. 
     */
    //public static final String SERVLET_CLASSPATH = "org.apache.tomcat.jsp_classpath";
    public static final String SERVLET_CLASSPATH = "org.apache.catalina.jsp_classpath";

    /**
     * FIXME
     * Request attribute for <code>&lt;jsp-file&gt;</code> element of a
     * servlet definition.  If present on a request, this overrides the
     * value returned by <code>request.getServletPath()</code> to select
     * the JSP page to be executed.
     */
    public static final String JSP_FILE = "org.apache.catalina.jsp_file";


    /**
     * FIXME
     * ServletContext attribute for class loader. This is tomcat specific. 
     * Other servlet engines can choose to have this attribute if they 
     * want to have this JSP engine running on them. 
     */
    //public static final String SERVLET_CLASS_LOADER = "org.apache.tomcat.classloader";
    public static final String SERVLET_CLASS_LOADER = "org.apache.catalina.classloader";

    /**
     * Default size of the JSP buffer.
     */
    public static final int K = 1024;
    public static final int DEFAULT_BUFFER_SIZE = 8*K;

    /**
     * Default size for the tag buffers.
     */
    public static final int DEFAULT_TAG_BUFFER_SIZE = 512;

    /**
     * The query parameter that causes the JSP engine to just
     * pregenerated the servlet but not invoke it. 
     */
    public static final String PRECOMPILE = "jsp_precompile";

    /**
     * The default package name for compiled jsp pages.
     */
    public static final String JSP_PACKAGE_NAME = "org.apache.jsp";

    /**
     * Servlet context and request attributes that the JSP engine
     * uses. 
     */
    public static final String INC_REQUEST_URI = "javax.servlet.include.request_uri";
    public static final String INC_SERVLET_PATH = "javax.servlet.include.servlet_path";
    public static final String TMP_DIR = "javax.servlet.context.tempdir";
    public static final String FORWARD_SEEN = "javax.servlet.forward.seen";

    /**
     * Public Id and the Resource path (of the cached copy) 
     * of the DTDs for tag library descriptors. 
     */
    public static final String TAGLIB_DTD_PUBLIC_ID_11 = 
	"-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.1//EN";
    public static final String TAGLIB_DTD_RESOURCE_PATH_11 = 
	"/javax/servlet/jsp/resources/web-jsptaglibrary_1_1.dtd";
    public static final String TAGLIB_DTD_PUBLIC_ID_12 = 
	"-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN";
    public static final String TAGLIB_DTD_RESOURCE_PATH_12 = 
	"/javax/servlet/jsp/resources/web-jsptaglibrary_1_2.dtd";

    /**
     * Public Id and the Resource path (of the cached copy) 
     * of the DTDs for web application deployment descriptors
     */
    public static final String WEBAPP_DTD_PUBLIC_ID_22 = 
	"-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN";
    public static final String WEBAPP_DTD_RESOURCE_PATH_22 = 
	"/javax/servlet/resources/web-app_2_2.dtd";
    public static final String WEBAPP_DTD_PUBLIC_ID_23 = 
	"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN";
    public static final String WEBAPP_DTD_RESOURCE_PATH_23 = 
	"/javax/servlet/resources/web-app_2_3.dtd";

    /**
     * List of the Public IDs that we cache, and their
     * associated location. This is used by 
     * an EntityResolver to return the location of the
     * cached copy of a DTD.
     */
    public static final String[] CACHED_DTD_PUBLIC_IDS = {
	TAGLIB_DTD_PUBLIC_ID_11,
	TAGLIB_DTD_PUBLIC_ID_12,
	WEBAPP_DTD_PUBLIC_ID_22,
	WEBAPP_DTD_PUBLIC_ID_23,
    };
    public static final String[] CACHED_DTD_RESOURCE_PATHS = {
	TAGLIB_DTD_RESOURCE_PATH_11,
	TAGLIB_DTD_RESOURCE_PATH_12,
	WEBAPP_DTD_RESOURCE_PATH_22,
	WEBAPP_DTD_RESOURCE_PATH_23,
    };
    
    /**
     * Default URLs to download the pluging for Netscape and IE.
     */
    public static final String NS_PLUGIN_URL = 
        "http://java.sun.com/products/plugin/";

    public static final String IE_PLUGIN_URL = 
        "http://java.sun.com/products/plugin/1.2.2/jinstall-1_2_2-win.cab#Version=1,2,2,0";

    /**
     * This is where all our error messages and such are stored. 
     */
    private static ResourceBundle resources;
    
    private static void initResources() {
	try {
	    resources =
		ResourceBundle.getBundle("studio.beansoft.jasper.resources.messages");
	} catch (MissingResourceException e) {
	    throw new Error("Fatal Error: missing resource bundle: "+e.getClassName());
	}
    }

    /**
     * Get hold of a "message" or any string from our resources
     * database. 
     */
    public static final String getString(String key) {
        return getString(key, null);
    }

    /**
     * Format the string that is looked up using "key" using "args". 
     */
    public static final String getString(String key, Object[] args) {
        if (resources == null) 
            initResources();
        
        try {
            String msg = resources.getString(key);
            if (args == null)
                return msg;
            MessageFormat form = new MessageFormat(msg);
            return form.format(args);
        } catch (MissingResourceException ignore) {
            throw new Error("Fatal Error: missing resource: "+ignore.getClassName());
        }
    }

    /** 
     * Print a message into standard error with a certain verbosity
     * level. 
     * 
     * @param key is used to look up the text for the message (using
     *            getString()). 
     * @param verbosityLevel is used to determine if this output is
     *                       appropriate for the current verbosity
     *                       level. 
     */
    public static final void message(String key, int verbosityLevel) {
        message(key, null, verbosityLevel);
    }


    /**
     * Print a message into standard error with a certain verbosity
     * level after formatting it using "args". 
     *
     * @param key is used to look up the message. 
     * @param args is used to format the message. 
     * @param verbosityLevel is used to determine if this output is
     *                       appropriate for the current verbosity
     *                       level. 
     */
    public static final void message(String key, Object[] args, int verbosityLevel) {
//	if (jasperLog == null) {
//	    jasperLog = Logger.getLogger("JASPER_LOG");
//	    if (jasperLog == null) {
//		jasperLog = Logger.getDefaultLogger();
//	    }
//	}
//
//	if (jasperLog != null) {
//	    jasperLog.log(getString(key, args), verbosityLevel);
//	}
		if(key != null) {
			System.err.println("key=" + key);
		}
		
		if(args != null) {
			for(int i = 0; i < args.length; i++) {
				System.err.println(args[i]);
			}
 		}
   }

//    public static Logger jasperLog = null;
}