/*
 * 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;

import org.apache.commons.vfs2.util.RandomAccessMode;
import org.junit.Test;

/**
 * Random read and write test case for file providers.
 */
public class ProviderRandomReadWriteTests extends AbstractProviderTestCase {

    private static final String TEST_DATA = "This is a test file.";

    /**
     * Sets up a scratch folder for the test to use.
     */
    protected FileObject createScratchFolder() throws Exception {
        final FileObject scratchFolder = getWriteFolder();

        // Make sure the test folder is empty
        scratchFolder.delete(Selectors.EXCLUDE_SELF);
        scratchFolder.createFolder();

        return scratchFolder;
    }

    /**
     * Returns the capabilities required by the tests of this test case.
     */
    @Override
    protected Capability[] getRequiredCapabilities() {
        return new Capability[] { Capability.GET_TYPE, Capability.CREATE, Capability.RANDOM_ACCESS_READ,
                Capability.RANDOM_ACCESS_WRITE };
    }

    /**
     * Writes a file
     */
    @Test
    public void testRandomWrite() throws Exception {
        try (FileObject file = createScratchFolder().resolveFile("random_write.txt")) {
            file.createFile();
            final RandomAccessContent ra = file.getContent().getRandomAccessContent(RandomAccessMode.READWRITE);

            // write first byte
            ra.writeByte(TEST_DATA.charAt(0));

            // start at pos 4
            ra.seek(3);
            ra.writeByte(TEST_DATA.charAt(3));
            ra.writeByte(TEST_DATA.charAt(4));

            // restart at pos 4 (but overwrite with different content)
            ra.seek(3);
            ra.writeByte(TEST_DATA.charAt(7));
            ra.writeByte(TEST_DATA.charAt(8));

            // advance to pos 11
            ra.seek(10);
            ra.writeByte(TEST_DATA.charAt(10));
            ra.writeByte(TEST_DATA.charAt(11));

            // now read
            ra.seek(0);
            assertEquals(ra.readByte(), TEST_DATA.charAt(0));

            ra.seek(3);
            assertEquals(ra.readByte(), TEST_DATA.charAt(7));
            assertEquals(ra.readByte(), TEST_DATA.charAt(8));

            ra.seek(10);
            assertEquals(ra.readByte(), TEST_DATA.charAt(10));
            assertEquals(ra.readByte(), TEST_DATA.charAt(11));
        }
    }

}
