modules/security/src/test/api/java/org/apache/harmony/security/tests/java/security/PermissionCollectionTest.java

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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.
 */

/**
* @author Alexey V. Varlamov
*/

package org.apache.harmony.security.tests.java.security;
import java.security.*;
import java.util.*;

import junit.framework.TestCase;


/**
 * Tests for <code>PermissionCollection</code>
 * 
 */

public class PermissionCollectionTest extends TestCase {

    public static void main(String[] args) {
        junit.textui.TestRunner.run(PermissionCollectionTest.class);
    }

    /**
     * Constructor for PermissionCollectionTest.
     * @param arg0
     */
    public PermissionCollectionTest(String arg0) {
        super(arg0);
    }
   
    // Bare extension to instantiate abstract PermissionCollection class
    private static final class RealPermissionCollection extends PermissionCollection
    {
        final private Collection col; 
        public RealPermissionCollection(Collection col)
        {
            this.col = col;            
        }
        
        public void add(Permission permission) {}
        
        public Enumeration elements() 
        {
            return col == null ? null : Collections.enumeration(col);
        }
        
        public boolean implies(Permission permission) 
        {
            return false;
        }
    }
        
    /** Test read-only flag. Should be false by default and can be set once forever. */
    public void testReadOnly()
    {
        PermissionCollection pc = new RealPermissionCollection(null);
        assertFalse("should not be read-only by default", pc.isReadOnly());
        pc.setReadOnly();
        assertTrue("explicitly set read-only", pc.isReadOnly());
        pc.setReadOnly();
        assertTrue("more calls to setReadOnly() should not harm", pc.isReadOnly());
    }
}