spring security CollectionFilterer 源码
spring security CollectionFilterer 代码
文件路径：/acl/src/main/java/org/springframework/security/acls/afterinvocation/CollectionFilterer.java
/*
* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
*
* 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.acls.afterinvocation;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.core.log.LogMessage;
/**
* A filter used to filter Collections.
*
* @author Ben Alex
* @author Paulo Neves
*/
class CollectionFilterer<T> implements Filterer<T> {
protected static final Log logger = LogFactory.getLog(CollectionFilterer.class);
private final Collection<T> collection;
private final Set<T> removeList;
CollectionFilterer(Collection<T> collection) {
this.collection = collection;
// We create a Set of objects to be removed from the Collection,
// as ConcurrentModificationException prevents removal during
// iteration, and making a new Collection to be returned is
// problematic as the original Collection implementation passed
// to the method may not necessarily be re-constructable (as
// the Collection(collection) constructor is not guaranteed and
// manually adding may lose sort order or other capabilities)
this.removeList = new HashSet<>();
}
@Override
public Object getFilteredObject() {
// Now the Iterator has ended, remove Objects from Collection
Iterator<T> removeIter = this.removeList.iterator();
int originalSize = this.collection.size();
while (removeIter.hasNext()) {
this.collection.remove(removeIter.next());
}
logger.debug(LogMessage.of(() -> "Original collection contained " + originalSize + " elements; now contains "
+ this.collection.size() + " elements"));
return this.collection;
}
@Override
public Iterator<T> iterator() {
return this.collection.iterator();
}
@Override
public void remove(T object) {
this.removeList.add(object);
}
}
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