org.wildfly.security.permission.IntNameSetPermissionCollection Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* JBoss, Home of Professional Open Source.
* Copyright 2016 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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.wildfly.security.permission;
import java.security.Permission;
import java.util.NoSuchElementException;
import java.util.concurrent.atomic.AtomicInteger;
import org.wildfly.security.util.EnumerationIterator;
import org.wildfly.security.util.StringEnumeration;
final class IntNameSetPermissionCollection extends NameSetPermissionCollection {
private final AtomicInteger bitSet = new AtomicInteger();
IntNameSetPermissionCollection(final AbstractPermission sourcePermission, final StringEnumeration nameEnumeration) {
super(sourcePermission, nameEnumeration);
}
private Permission permissionFor(int id) {
return ((AbstractNamedPermission)getSourcePermission()).withName(getNameEnumeration().nameOf(id));
}
protected void doAdd(final AbstractPermission permission) {
int setBits= getBitsForName(permission);
final AtomicInteger bitSet = this.bitSet;
int oldVal;
do {
oldVal = bitSet.get();
if ((oldVal & setBits) == setBits) {
return;
}
} while (! bitSet.compareAndSet(oldVal, oldVal | setBits));
}
public boolean implies(final Permission permission) {
if (permission.getClass() != getSourcePermission().getClass()) {
return false;
}
long testBits = getBitsForName(permission);
return (bitSet.get() & testBits) == testBits;
}
public int size() {
final int size = Integer.bitCount(bitSet.get());
return size == getNameEnumeration().size() ? 1 : size;
}
public EnumerationIterator iterator() {
return new Iter(bitSet.get());
}
public EnumerationIterator elements() {
return iterator();
}
private int getBitsForName(final Permission permission) {
final int bits;
final String name = permission.getName();
final StringEnumeration nameEnumeration = getNameEnumeration();
if ("*".equals(name)) {
// add all names
bits = (1 << nameEnumeration.size()) - 1;
} else {
bits = 1 << nameEnumeration.indexOf(name);
}
return bits;
}
private class Iter implements EnumerationIterator {
private int bits;
Iter(final int bits) {
this.bits = bits;
}
public boolean hasMoreElements() {
return bits != 0;
}
public Permission nextElement() {
final int bits = this.bits;
if (bits == 0) throw new NoSuchElementException();
if (Integer.bitCount(bits) == getNameEnumeration().size()) {
this.bits = 0;
return ((AbstractNamedPermission) getSourcePermission()).withName("*");
}
int bit = Integer.lowestOneBit(bits);
this.bits = bits & ~bit;
return permissionFor(Integer.numberOfTrailingZeros(bit));
}
public boolean hasNext() {
return hasMoreElements();
}
public Permission next() {
return nextElement();
}
}
}