org.wildfly.security.permission.BooleanPermissionCollection Maven / Gradle / Ivy
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* 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.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Set;
/**
* A permission collection type which either does or does not hold its instance.
*
* @author David M. Lloyd
*/
public final class BooleanPermissionCollection extends AbstractPermissionCollection {
private volatile boolean added;
/**
* Construct a new instance.
*
* @param sourcePermission the source permission for this collection (must not be {@code null})
*/
public BooleanPermissionCollection(final AbstractPermission sourcePermission) {
super(sourcePermission);
}
public int size() {
return added ? 1 : 0;
}
public Iterator iterator() {
return added ? getSingletonCollection().iterator() : Collections.emptyIterator();
}
public Enumeration elements() {
return added ? Collections.enumeration(getSingletonCollection()) : Collections.emptyEnumeration();
}
private Set getSingletonCollection() {
return Collections.singleton(getSourcePermission());
}
protected void doAdd(final AbstractPermission permission) {
added = true;
}
public boolean implies(final Permission permission) {
return added && permission.getClass() == getSourcePermission().getClass();
}
}