/*
 * 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 {

    public static final String SPEC_VERSION = "2.3";

    /**
     * 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");

    /**
     * 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");

    /**
     * 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;

    /**
     * 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");

    /**
     * Default URLs to download the plugin for Netscape and IE.
     *
     * @deprecated Will be removed in Tomcat 10.1 onwards
     */
    @Deprecated
    public static final String NS_PLUGIN_URL =
        "http://java.sun.com/products/plugin/";

    @Deprecated
    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.parseBoolean(System.getProperty("org.apache.jasper.Constants.USE_INSTANCE_MANAGER_FOR_TAGS", "false"));

    /**
     * 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 ServletContext init-param that determines if the XML parsers
     * used for *.tld files will be validating or not.
     * <p>
     * This must be kept in sync with org.apache.catalina.Globals
     */
    public static final String XML_VALIDATION_TLD_INIT_PARAM =
            "org.apache.jasper.XML_VALIDATE_TLD";

    /**
     * Name of the ServletContext init-param that determines if the XML parsers
     * will block the resolution of external entities.
     * <p>
     * This must be kept in sync with org.apache.catalina.Globals
     */
    public static final String XML_BLOCK_EXTERNAL_INIT_PARAM =
            "org.apache.jasper.XML_BLOCK_EXTERNAL";
}
