spring security ArrayFilterer 源码
spring security ArrayFilterer 代码
文件路径：/acl/src/main/java/org/springframework/security/acls/afterinvocation/ArrayFilterer.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.lang.reflect.Array;
import java.util.HashSet;
import java.util.Iterator;
import java.util.NoSuchElementException;
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 arrays.
*
* @author Ben Alex
* @author Paulo Neves
*/
class ArrayFilterer<T> implements Filterer<T> {
protected static final Log logger = LogFactory.getLog(ArrayFilterer.class);
private final Set<T> removeList;
private final T[] list;
ArrayFilterer(T[] list) {
this.list = list;
// Collect the removed objects to a HashSet so that
// it is fast to lookup them when a filtered array
// is constructed.
this.removeList = new HashSet<>();
}
@Override
@SuppressWarnings("unchecked")
public T[] getFilteredObject() {
// Recreate an array of same type and filter the removed objects.
int originalSize = this.list.length;
int sizeOfResultingList = originalSize - this.removeList.size();
T[] filtered = (T[]) Array.newInstance(this.list.getClass().getComponentType(), sizeOfResultingList);
for (int i = 0, j = 0; i < this.list.length; i++) {
T object = this.list[i];
if (!this.removeList.contains(object)) {
filtered[j] = object;
j++;
}
}
logger.debug(LogMessage.of(() -> "Original array contained " + originalSize + " elements; now contains "
+ sizeOfResultingList + " elements"));
return filtered;
}
@Override
public Iterator<T> iterator() {
return new ArrayFiltererIterator();
}
@Override
public void remove(T object) {
this.removeList.add(object);
}
/**
* Iterator for {@link ArrayFilterer} elements.
*/
private class ArrayFiltererIterator implements Iterator<T> {
private int index = 0;
@Override
public boolean hasNext() {
return this.index < ArrayFilterer.this.list.length;
}
@Override
public T next() {
if (hasNext()) {
return ArrayFilterer.this.list[this.index++];
}
throw new NoSuchElementException();
}
}
}
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