Examples of org.apache.derby.impl.io.vfmem.VirtualFile

org.apache.derby.impl.io.vfmem.VirtualFile
Represents a file in the virtual file system.
A virtual file is not created until one of the following methods are invoked:
- {@code createNewFile}
- {@code getOutputStream}
- {@code getRandomAccessFile}
- {@code mkdir}
- {@code mkdirs}
When a method that requires access to the file data or to know if the file exists or not, the associated data store is consulted.

        assertFalse(vFile.mkdirs());
    }


    public void testGetParentRelative() {
        DataStore store = getStore();
        VirtualFile vFile = new VirtualFile(
                PathUtilTest.join(NON_EXISTING_DIRS), store);
        int count = 0;
        StorageFile parent = vFile.getParentDir();
        while (parent != null) {
            count++;
            parent = parent.getParentDir();
        }
        assertEquals(4, count);

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        assertEquals(4, count);
    }


    public void testGetParentAbsolute() {
        DataStore store = getStore();
        VirtualFile vFile = new VirtualFile(
                PathUtilTest.joinAbs(NON_EXISTING_DIRS), store);
        int count = 0;
        StorageFile parent = vFile.getParentDir();
        while (parent != null) {
            count++;
            parent = parent.getParentDir();
        }
        assertEquals(5, count);

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        DataStore store = getStore();
        String[] dirs = new String[] {
            "seg0", PathUtilTest.join("seg0", "dir1"),
            "seg1", PathUtilTest.join("seg0", "dir2")};
        for (int i=0; i < dirs.length; i++) {
            assertTrue(new VirtualFile(dirs[i], store).mkdir());
        }
        String[] files = new String[] {
            PathUtilTest.join("seg0", "f1"),
            PathUtilTest.join("seg0", "dir1", "f1"),
            PathUtilTest.join("seg1", "f1"), PathUtilTest.join("seg0","f5")};
        for (int i=0; i < files.length; i++) {
            assertTrue(new VirtualFile(files[i], store).createNewFile());
        }
        String root = "seg0";
        VirtualFile rootToDelete = new VirtualFile(root, store);
        assertTrue(rootToDelete.deleteAll());
        for (int i=0; i < dirs.length; i++) {
            assertEquals(!dirs[i].startsWith(root),
                         new VirtualFile(dirs[i], store).exists());
        }
        for (int i=0; i < files.length; i++) {
            assertEquals(!files[i].startsWith(root),
                         new VirtualFile(files[i], store).exists());
        }
    }

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        }
    }


    public void testRenameToSimple() {
        DataStore store = getStore();
        VirtualFile vFile = new VirtualFile("originalFile", store);
        assertFalse(vFile.canWrite());
        vFile.createNewFile();
        assertTrue(vFile.canWrite());
        VirtualFile newFile = new VirtualFile("newFile", store);
        assertFalse(newFile.exists());
        assertTrue(vFile.renameTo(newFile));
        assertFalse(vFile.exists());
        assertFalse(vFile.canWrite());
        assertTrue(newFile.exists());
    }

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     * should cause the file to be created.
     */
    public void testGetRAFNonExisting()
            throws FileNotFoundException {
        DataStore store = getStore();
        VirtualFile vFile = new VirtualFile("aNewFile.txt", store);
        assertFalse(vFile.exists());
        StorageRandomAccessFile vRAF = vFile.getRandomAccessFile("rw");
        assertNotNull(vRAF);
        assertTrue(vFile.exists());
    }

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     * should fail, and the file shouldn't be created.
     */
    public void testGetRAFNonExistingReadMode()
            throws FileNotFoundException {
        DataStore store = getStore();
        VirtualFile vFile = new VirtualFile("aNewFile.txt", store);
        assertFalse(vFile.exists());
        try {
            vFile.getRandomAccessFile("r");
            fail("Cannot read from a non-exsiting file");
        } catch (FileNotFoundException fnfe) {
            // Expected.
        }
        assertFalse(vFile.exists());
    }

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     * Opening for reading only should work, opening for writing should fail.
     */
    public void testGetRAExistingReadOnly()
            throws FileNotFoundException {
        DataStore store = getStore();
        VirtualFile vFile = new VirtualFile("aNewFile.txt", store);
        assertFalse(vFile.exists());
        assertTrue(vFile.createNewFile());
        assertTrue(vFile.exists());
        assertTrue(vFile.setReadOnly());
        assertNotNull(vFile.getRandomAccessFile("r"));
        // Try opening in write mode, which should fail.
        try {
            vFile.getRandomAccessFile("rw");
            fail("Should not be able to open a read-only file in write mode");
        } catch (FileNotFoundException fnfe) {
            // Expected.
        }
    }

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    /**
     * Opening a random access file on a directory should fail.
     */
    public void testGetRAFOnDirectory() {
        DataStore store = getStore();
        VirtualFile vFile = new VirtualFile("mydir", store);
        assertTrue(vFile.mkdir());
        assertTrue(vFile.exists());
        assertTrue(vFile.isDirectory());
        // Try opening in read mode.
        try {
            vFile.getRandomAccessFile("r");
            fail("Opening a RAF on a directory should have failed");
        } catch (FileNotFoundException fnfe) {
            // Expected.
        }
        // Try opening in write mode.
        try {
            vFile.getRandomAccessFile("r");
            fail("Opening a RAF on a directory should have failed");
        } catch (FileNotFoundException fnfe) {
            // Expected.
        }
        // A few sanity checks.
        assertTrue(vFile.exists());
        assertTrue(vFile.isDirectory());
    }

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    /**
     * Tests that {@code listChildren} doesn't include too many entries.
     */
    public void testListChilderen() {
        DataStore store = getStore();
        VirtualFile dir1 = new VirtualFile(PathUtilTest.abs("mydir"), store);
        VirtualFile dir2 = new VirtualFile(
                PathUtilTest.abs("mydirectory"), store);
        VirtualFile file1 = new VirtualFile(
                PathUtilTest.joinAbs("mydir", "file1.txt"), store);
        VirtualFile file2 = new VirtualFile(
                PathUtilTest.joinAbs("mydirectory", "file2.txt"), store);
        assertTrue(dir1.mkdirs());
        assertTrue(dir1.exists());
        assertTrue(dir1.isDirectory());
        assertTrue(dir2.mkdirs());
        assertTrue(dir2.exists());
        assertTrue(dir2.isDirectory());
        assertTrue(file1.createNewFile());
        assertTrue(file1.exists());
        assertFalse(file1.isDirectory());
        assertTrue(file2.createNewFile());
        assertTrue(file2.exists());
        assertFalse(file2.isDirectory());
        // We should only get one child; file1.txt
        String[] children = dir1.list();
        assertEquals(1, children.length);
        assertEquals(file1.getName(), children[0]);
        // Test that the same path ending with the separator results in the
        // same list being returned.
        VirtualFile dir1abs = new VirtualFile(
                PathUtilTest.joinAbs("mydir", ""), store);
        assertFalse(dir1.getName().equals(dir1abs.getName()));
        String[] childrenAbs = dir1abs.list();
        assertEquals(1, childrenAbs.length);
        assertEquals(children[0], childrenAbs[0]);
        // The deleteAll below shouldn't delete "mydirectory" and "file2.txt"..
        assertFalse(dir1.delete());
        assertTrue(dir1.deleteAll());

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    public void testCreateRoot() {
        DataStore store = new DataStore("testCreateRootStore");
        String path = PathUtilTest.joinAbs("these", "are", "directories");
        assertTrue(store.createAllParents(path));
        assertNotNull(store.createEntry(path, true));
        VirtualFile vf = new VirtualFile(path, store);
        assertTrue(vf.exists());
        assertTrue(vf.isDirectory());


        // Also test one Windows specific root.
        path = PathUtilTest.join("c:", "Documents and Settings", "directories");
        assertTrue(store.createAllParents(path));
        assertNotNull(store.createEntry(path, true));
        vf = new VirtualFile(path, store);
        assertTrue(vf.exists());
        assertTrue(vf.isDirectory());
    }

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Related Classes of org.apache.derby.impl.io.vfmem.VirtualFile

org.apache.derby.impl.io.VFMemoryStorageFactory

org.apache.derbyTesting.unitTests.junit.VirtualFileTest

java.io.FileNotFoundException

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