spring security AuthorityUtils 源码
spring security AuthorityUtils 代码
文件路径：/core/src/main/java/org/springframework/security/core/authority/AuthorityUtils.java
/*
* Copyright 2002-2016 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
*
* https://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.core.authority;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
/**
* Utility method for manipulating <tt>GrantedAuthority</tt> collections etc.
* <p>
* Mainly intended for internal use.
*
* @author Luke Taylor
*/
public final class AuthorityUtils {
public static final List<GrantedAuthority> NO_AUTHORITIES = Collections.emptyList();
private AuthorityUtils() {
}
/**
* Creates a array of GrantedAuthority objects from a comma-separated string
* representation (e.g. "ROLE_A, ROLE_B, ROLE_C").
* @param authorityString the comma-separated string
* @return the authorities created by tokenizing the string
*/
public static List<GrantedAuthority> commaSeparatedStringToAuthorityList(String authorityString) {
return createAuthorityList(StringUtils.tokenizeToStringArray(authorityString, ","));
}
/**
* Converts an array of GrantedAuthority objects to a Set.
* @return a Set of the Strings obtained from each call to
* GrantedAuthority.getAuthority()
*/
public static Set<String> authorityListToSet(Collection<? extends GrantedAuthority> userAuthorities) {
Assert.notNull(userAuthorities, "userAuthorities cannot be null");
Set<String> set = new HashSet<>(userAuthorities.size());
for (GrantedAuthority authority : userAuthorities) {
set.add(authority.getAuthority());
}
return set;
}
/**
* Converts authorities into a List of GrantedAuthority objects.
* @param authorities the authorities to convert
* @return a List of GrantedAuthority objects
*/
public static List<GrantedAuthority> createAuthorityList(String... authorities) {
List<GrantedAuthority> grantedAuthorities = new ArrayList<>(authorities.length);
for (String authority : authorities) {
grantedAuthorities.add(new SimpleGrantedAuthority(authority));
}
return grantedAuthorities;
}
}
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