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/*
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 *
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 *
 * The contents of this file are subject to the terms of either the GNU
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
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package com.sun.enterprise.security.authorize;

import java.security.SecurityPermission;
import javax.security.jacc.PolicyContextHandler;

/**
 * This class is created by the container and handed over to the 
 * JACC provider. This lets the jacc provider to use the information
 * in making authorization decisions, if it wishes to do so.
 * @author Harpreet Singh
 * @author Shing Wai Chan
 */
public class PolicyContextHandlerImpl implements PolicyContextHandler {

    public static final String HTTP_SERVLET_REQUEST =
        "javax.servlet.http.HttpServletRequest";
    public static final String SOAP_MESSAGE = "javax.xml.soap.SOAPMessage";
    public static final String ENTERPRISE_BEAN = "javax.ejb.EnterpriseBean";
    public static final String EJB_ARGUMENTS = "javax.ejb.arguments";
    public static final String SUBJECT = "javax.security.auth.Subject.container";
    public static final String REUSE = "java.security.Policy.supportsReuse";

    private static PolicyContextHandlerImpl pchimpl = null;

    private ThreadLocal thisHandlerData = new ThreadLocal();

    private PolicyContextHandlerImpl() {
    }

    private synchronized static PolicyContextHandlerImpl _getInstance() {
        if (pchimpl == null) {
            pchimpl = new PolicyContextHandlerImpl();
        }
        return pchimpl;
    }

    public static PolicyContextHandler getInstance() {
        SecurityManager sm = System.getSecurityManager();
        if (sm != null) {
            sm.checkPermission(new SecurityPermission("setPolicy"));
        }
    
        return _getInstance();
    }

    public boolean supports(String key) {
	String[] s = getKeys();
	for (int i = 0; i