/*
* Copyright 2002-2005 The Apache Software Foundation.
*
* 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.apache.commons.vfs.test;
import org.apache.commons.vfs.Capability;
import org.apache.commons.vfs.FileObject;
import org.apache.commons.vfs.RandomAccessContent;
import org.apache.commons.vfs.Selectors;
import org.apache.commons.vfs.util.RandomAccessMode;
/**
* RanomdRead/Write test cases for file providers.
*
* @author <a href="mailto:imario@apache.org">Mario Ivankovits</a>
*/
public class ProviderRandomReadWriteTests
extends AbstractProviderTestCase
{
private final String TEST_DATA = "This is a test file.";
/**
* Returns the capabilities required by the tests of this test case.
*/
protected Capability[] getRequiredCaps()
{
return new Capability[]
{
Capability.GET_TYPE,
Capability.CREATE,
Capability.RANDOM_ACCESS_READ,
Capability.RANDOM_ACCESS_WRITE
};
}
/**
* Sets up a scratch folder for the test to use.
*/
protected FileObject createScratchFolder() throws Exception
{
FileObject scratchFolder = getWriteFolder();
// Make sure the test folder is empty
scratchFolder.delete(Selectors.EXCLUDE_SELF);
scratchFolder.createFolder();
return scratchFolder;
}
/**
* Read a file
*/
public void testRandomWrite() throws Exception
{
FileObject file = null;
try
{
file = createScratchFolder().resolveFile("random_write.txt");
file.createFile();
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));
}
finally
{
if (file != null)
{
file.close();
}
}
}
}