/*
 * Copyright 2005-2008 Les Hazlewood, Jeremy Haile
 *
 * Licensed 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.jsecurity.util;

import org.jsecurity.authz.Permission;
import org.jsecurity.authz.permission.PermissionResolver;

import java.util.Arrays;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.Set;

/**
 * @author Les Hazlewood
 * @author Jeremy Haile
 * @since 0.1
 */
public class PermissionUtils {

    public static Set<Permission> resolveDelimitedPermissions(String s, PermissionResolver permissionResolver) {
        Set<String> permStrings = toPermissionStrings(s);
        return resolvePermissions(permStrings, permissionResolver);
    }

    public static Set<String> toPermissionStrings(String permissionsString) {
        String[] tokens = StringUtils.split(permissionsString);
        if ( tokens != null && tokens.length > 0 ) {
            return new LinkedHashSet<String>(Arrays.asList(tokens));
        }
        return null;
    }

    public static Set<Permission> resolvePermissions(Collection<String> permissionStrings, PermissionResolver permissionResolver) {
        Set<Permission> permissions = new LinkedHashSet<Permission>(permissionStrings.size());
        for (String permissionString : permissionStrings) {
            permissions.add(permissionResolver.resolvePermission(permissionString));
        }
        return permissions;
    }
}