/*
 * 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.
 */
package org.apache.commons.vfs2.cache;

import org.apache.commons.vfs2.FileName;
import org.apache.commons.vfs2.FileObject;
import org.apache.commons.vfs2.FileSystem;
import org.apache.commons.vfs2.FilesCache;
import org.apache.commons.vfs2.impl.DefaultFileSystemManager;
import org.junit.Assert;
import org.junit.Test;


/**
 * Tests for {@link NullFilesCache} used by {@link NullFilesCacheTestCase}.
 */
public class NullFilesCacheTests extends AbstractFilesCacheTestsBase {

    @Test
    public void testFilesCache() throws Exception {
        final FileObject scratchFolder = getWriteFolder();
        Assert.assertNotNull("This test should not have a null FileObject scratch folder", scratchFolder);

        final FileObject dir1 = scratchFolder.resolveFile("dir1");
        final FileObject dir1_2 = scratchFolder.resolveFile("dir1");

        assertNotSame("Should always be new instance with NullCache", dir1, dir1_2);
    }

    @Override
    @Test
    public void testBasicCacheOps() throws Exception {
        final DefaultFileSystemManager manager = getManager();
        Assert.assertNotNull("This test should not have a null DefaultFileSystemManager", manager);
        // the basic test looks different for a null cache:
        final FilesCache cache = manager.getFilesCache();
        final FileObject fo = getWriteFolder().resolveFile("dir1");
        final FileName fn = fo.getName();
        final FileSystem fs = fo.getFileSystem();

        cache.clear(fs);
        assertNull(cache.getFile(fs, fn));

        cache.putFile(fo);
        assertNull(null, cache.getFile(fs, fn));

        assertFalse(cache.putFileIfAbsent(fo)); // hmmm?
        assertNull(null, cache.getFile(fs, fn));

        cache.removeFile(fs, fn);
        assertNull(cache.getFile(fs, fn));
    }

    @Test
    public void testClass() {
        final DefaultFileSystemManager manager = getManager();
        Assert.assertNotNull("This test should not have a null DefaultFileSystemManager", manager);
        assertTrue(manager.getFilesCache() instanceof NullFilesCache);
    }
}