| /* |
| * 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 java.io.IOException; |
| |
| import org.apache.commons.vfs2.util.RandomAccessMode; |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| /** |
| * Random set length test cases for file providers. |
| * |
| */ |
| public class ProviderRandomSetLengthTests 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 = this.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.RANDOM_ACCESS_READ, Capability.RANDOM_ACCESS_WRITE, |
| Capability.RANDOM_ACCESS_SET_LENGTH }; |
| } |
| |
| /** |
| * Writes a file |
| */ |
| @Test |
| public void testRandomSetLength() throws Exception { |
| try (FileObject file = this.createScratchFolder().resolveFile("random_write.txt")) { |
| file.createFile(); |
| final String fileString = file.toString(); |
| final RandomAccessContent ra = file.getContent().getRandomAccessContent(RandomAccessMode.READWRITE); |
| |
| // Write long string |
| ra.writeBytes(TEST_DATA); |
| Assert.assertEquals(fileString, TEST_DATA.length(), ra.length()); |
| |
| // Shrink to length 1 |
| ra.setLength(1); |
| Assert.assertEquals(fileString, 1, ra.length()); |
| // now read 1 |
| ra.seek(0); |
| Assert.assertEquals(fileString, TEST_DATA.charAt(0), ra.readByte()); |
| |
| try { |
| ra.readByte(); |
| Assert.fail("Expected " + Exception.class.getName()); |
| } catch (final IOException e) { |
| // Expected |
| } |
| |
| // Grow to length 2 |
| ra.setLength(2); |
| Assert.assertEquals(fileString, 2, ra.length()); |
| // We have an undefined extra byte |
| ra.seek(1); |
| ra.readByte(); |
| |
| } |
| } |
| } |