/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.jasper;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;


/**
 * Some constants and other global data that are used by the compiler and the runtime.
 *
 * @author Anil K. Vijendran
 * @author Harish Prabandham
 * @author Shawn Bayern
 * @author Mark Roth
 */
public class Constants {
    
    /**
     * The base class of the generated servlets. 
     */
    public static final String JSP_SERVLET_BASE = 
        System.getProperty("org.apache.jasper.Constants.JSP_SERVLET_BASE", "org.apache.jasper.runtime.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 = 
        System.getProperty("org.apache.jasper.Constants.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. 
     */
    private static final String[] PRIVATE_STANDARD_IMPORTS = { 
        "javax.servlet.*", 
        "javax.servlet.http.*", 
        "javax.servlet.jsp.*"
    };
    public static final List<String> STANDARD_IMPORTS =
        Collections.unmodifiableList(Arrays.asList(PRIVATE_STANDARD_IMPORTS));

    /**
     * ServletContext attribute for classpath. This is tomcat specific. 
     * Other servlet engines may choose to support this attribute if they 
     * want to have this JSP engine running on them. 
     */
    public static final String SERVLET_CLASSPATH = 
        System.getProperty("org.apache.jasper.Constants.SERVLET_CLASSPATH", "org.apache.catalina.jsp_classpath");

    /**
     * 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 = 
        System.getProperty("org.apache.jasper.Constants.JSP_FILE", "org.apache.catalina.jsp_file");


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

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

    /**
     * Default tag handler pool size.
     */
    public static final int MAX_POOL_SIZE = 5;

    /**
     * Platform specific new line sequence.
     */
    public static final String NEWLINE = System.getProperty("line.separator");

    /**
     * The query parameter that causes the JSP engine to just
     * pregenerated the servlet but not invoke it. 
     */
    public static final String PRECOMPILE = 
        System.getProperty("org.apache.jasper.Constants.PRECOMPILE", "jsp_precompile");

    /**
     * The default package name for compiled jsp pages.
     */
    public static final String JSP_PACKAGE_NAME = 
        System.getProperty("org.apache.jasper.Constants.JSP_PACKAGE_NAME", "org.apache.jsp");

    /**
     * The default package name for tag handlers generated from tag files
     */
    public static final String TAG_FILE_PACKAGE_NAME = 
        System.getProperty("org.apache.jasper.Constants.TAG_FILE_PACKAGE_NAME", "org.apache.jsp.tag");

    // Must be kept in sync with org/apache/catalina/Globals.java
    public static final String ALT_DD_ATTR = 
        System.getProperty("org.apache.jasper.Constants.ALT_DD_ATTR", "org.apache.catalina.deploy.alt_dd");

    /**
     * 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.
     */
    // TODO Add 2.4, 2.5, 3.0
    private static final String[] PRIVATE_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 List<String> CACHED_DTD_PUBLIC_IDS =
        Collections.unmodifiableList(
                Arrays.asList(PRIVATE_CACHED_DTD_PUBLIC_IDS));
    private static final String[] PRIVATE_CACHED_DTD_RESOURCE_PATHS = {
        TAGLIB_DTD_RESOURCE_PATH_11,
        TAGLIB_DTD_RESOURCE_PATH_12,
        WEBAPP_DTD_RESOURCE_PATH_22,
        WEBAPP_DTD_RESOURCE_PATH_23,
    };
    public static final List<String> CACHED_DTD_RESOURCE_PATHS =
        Collections.unmodifiableList(
                Arrays.asList(PRIVATE_CACHED_DTD_RESOURCE_PATHS));
    
    /**
     * Default URLs to download the plugin 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";

    /**
     * Prefix to use for generated temporary variable names
     */
    public static final String TEMP_VARIABLE_NAME_PREFIX =
        System.getProperty("org.apache.jasper.Constants.TEMP_VARIABLE_NAME_PREFIX", "_jspx_temp");

    /**
     * Has security been turned on?
     */
    public static final boolean IS_SECURITY_ENABLED = 
        (System.getSecurityManager() != null);

    public static final boolean USE_INSTANCE_MANAGER_FOR_TAGS =
        Boolean.valueOf(System.getProperty("org.apache.jasper.Constants.USE_INSTANCE_MANAGER_FOR_TAGS", "false")).booleanValue();

    /**
     * The name of the path parameter used to pass the session identifier
     * back and forth with the client.
     */
    public static final String SESSION_PARAMETER_NAME =
        System.getProperty("org.apache.catalina.SESSION_PARAMETER_NAME",
                "jsessionid");

    /**
     * Name of the system property containing
     * the tomcat product installation path
     */
    public static final String CATALINA_HOME_PROP = "catalina.home";

    /**
     * Name of the system property containing
     * the tomcat instance installation path
     */
    public static final String CATALINA_BASE_PROP = "catalina.base";

    /**
     * Name of system property containing default list of JARs to skip when
     * scanning JARs for configuration elements such as TLDs.
     */
    public static final String DEFAULT_JAR_SKIP_PROP=
            "tomcat.util.scan.DefaultJarScanner.jarsToSkip";

    /**
     * Name of system property containing additional list of JARs to skip when
     * scanning for TLDs.
     */
    public static final String TLD_JAR_SKIP_PROP=
            "org.apache.catalina.startup.TldConfig.jarsToSkip";
}
