org.wildfly.security.permission.LongNameSetPermissionCollection 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).

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/*
 * 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.AtomicLong;

import org.wildfly.security.util.EnumerationIterator;
import org.wildfly.security.util.StringEnumeration;

final class LongNameSetPermissionCollection extends NameSetPermissionCollection {

    private final AtomicLong bitSet = new AtomicLong();

    LongNameSetPermissionCollection(final AbstractPermission sourcePermission, final StringEnumeration nameEnumeration) {
        super(sourcePermission, nameEnumeration);
    }

    protected void doAdd(final AbstractPermission permission) {
        long setBits = getBitsForName(permission);
        final AtomicLong bitSet = this.bitSet;
        long 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 = Long.bitCount(bitSet.get());
        return size == getNameEnumeration().size() ? 1 : size;
    }

    public EnumerationIterator iterator() {
        return new Iter(bitSet.get());
    }

    public EnumerationIterator elements() {
        return iterator();
    }

    private long getBitsForName(final Permission permission) {
        final long bits;
        final String name = permission.getName();
        final StringEnumeration nameEnumeration = getNameEnumeration();
        if ("*".equals(name)) {
            // add all names
            bits = (1L << nameEnumeration.size()) - 1;
        } else {
            bits = 1L << nameEnumeration.indexOf(name);
        }
        return bits;
    }

    private class Iter implements EnumerationIterator {
        private long bits;

        Iter(final long bits) {
            this.bits = bits;
        }

        public boolean hasMoreElements() {
            return bits != 0;
        }

        public Permission nextElement() {
            final long bits = this.bits;
            if (bits == 0) throw new NoSuchElementException();
            if (Long.bitCount(bits) == getNameEnumeration().size()) {
                this.bits = 0;
                return ((AbstractNamedPermission) getSourcePermission()).withName("*");
            }
            long bit = Long.lowestOneBit(bits);
            this.bits = bits & ~bit;
            return permissionFor(Long.numberOfTrailingZeros(bit));
        }

        public boolean hasNext() {
            return hasMoreElements();
        }

        public Permission next() {
            return nextElement();
        }

        private Permission permissionFor(int id) {
            return ((AbstractNamedPermission)getSourcePermission()).withName(getNameEnumeration().nameOf(id));
        }
    }

}