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/*
 * Copyright (c) 2013, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package com.sun.enterprise.security.integration;

import java.security.CodeSource;
import java.security.Permission;
import java.security.PermissionCollection;
import java.security.Permissions;
import java.util.Enumeration;
import java.util.concurrent.ConcurrentHashMap;


public class PermsHolder {


    /**
     * The PermissionCollection for each CodeSource 
     */
    private ConcurrentHashMap loaderPC =
        new ConcurrentHashMap();

    
    /**
     * EE permissions for  a module
     */
    private PermissionCollection eePermissionCollection = null;

    /**
     * declared permissions in  a module
     */
    private PermissionCollection declaredPermissionCollection = null;

    public PermsHolder() {
        
    }

    public PermsHolder(PermissionCollection eePC, 
            PermissionCollection declPC,
            PermissionCollection restrictPC) {
     
        setEEPermissions(eePC);
        setDeclaredPermissions(declPC);
        setRestrictPermissions(restrictPC);
    }

    public void setEEPermissions(PermissionCollection eePc) {        
        eePermissionCollection = eePc;
    }


    public void setDeclaredPermissions(PermissionCollection declaredPc) {        
        declaredPermissionCollection = declaredPc;
    }
    
    public void setRestrictPermissions(PermissionCollection restrictPC) {
    }
    public PermissionCollection getCachedPerms(CodeSource codesource) {

        if (codesource == null)
            return null;
        
        String codeUrl = codesource.getLocation().toString();
        
        return loaderPC.get(codeUrl);
    }
    
    public PermissionCollection getPermissions(CodeSource codesource, 
            PermissionCollection parentPC ) {

        String codeUrl = codesource.getLocation().toString();
        PermissionCollection cachedPermissons = loaderPC.get(codeUrl);

        if (cachedPermissons != null)
            return cachedPermissons;        
        else 
            cachedPermissons = new Permissions();
        
        PermissionCollection pc = parentPC;

        if (pc != null) {
            Enumeration perms =  pc.elements();
            while (perms.hasMoreElements()) {
                Permission p = perms.nextElement();
                cachedPermissons.add(p);
            }
        }
        
            
        if (declaredPermissionCollection != null) {
            Enumeration dperms =  this.declaredPermissionCollection.elements();
            while (dperms.hasMoreElements()) {
                Permission p = dperms.nextElement();
                cachedPermissons.add(p);
            }
        }
        
        if (eePermissionCollection != null) {
            Enumeration eeperms =  eePermissionCollection.elements();
            while (eeperms.hasMoreElements()) {
                Permission p = eeperms.nextElement();
                cachedPermissons.add(p);
            }
            
        }
 
        PermissionCollection tmpPc = loaderPC.putIfAbsent(codeUrl, cachedPermissons);                
        if (tmpPc != null) {
            cachedPermissons = tmpPc;
        }

        return cachedPermissons;
        
    }
}