/*
* Copyright 2012-2016 the original author or authors.
*
* 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.springframework.security.access.hierarchicalroles;
import org.springframework.util.Assert;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.List;
import java.util.Map;
/**
* Utility methods for {@link RoleHierarchy}.
*
* @author Thomas Darimont
* @since 4.2.0
*/
public final class RoleHierarchyUtils {
private RoleHierarchyUtils() {
}
/**
* Converts the supplied {@link Map} of role name to implied role name(s) to a string
* representation understood by {@link RoleHierarchyImpl#setHierarchy(String)}.
* The map key is the role name and the map value is a {@link List} of implied role name(s).
*
* @param roleHierarchyMap the mapping(s) of role name to implied role name(s)
* @return a string representation of a role hierarchy
* @throws IllegalArgumentException if roleHierarchyMap is null or empty or if a role name is null or
* empty or if an implied role name(s) is null or empty
*
*/
public static String roleHierarchyFromMap(Map<String, List<String>> roleHierarchyMap) {
Assert.notEmpty(roleHierarchyMap, "roleHierarchyMap cannot be empty");
StringWriter roleHierarchyBuffer = new StringWriter();
PrintWriter roleHierarchyWriter = new PrintWriter(roleHierarchyBuffer);
for (Map.Entry<String, List<String>> roleHierarchyEntry : roleHierarchyMap.entrySet()) {
String role = roleHierarchyEntry.getKey();
List<String> impliedRoles = roleHierarchyEntry.getValue();
Assert.hasLength(role, "role name must be supplied");
Assert.notEmpty(impliedRoles, "implied role name(s) cannot be empty");
for (String impliedRole : impliedRoles) {
String roleMapping = role + " > " + impliedRole;
roleHierarchyWriter.println(roleMapping);
}
}
return roleHierarchyBuffer.toString();
}
}