| /* |
| * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 8003258 8029434 |
| * @run testng Lines |
| */ |
| |
| import java.io.BufferedReader; |
| import java.io.Reader; |
| import java.io.StringReader; |
| import java.io.LineNumberReader; |
| import java.io.IOException; |
| import java.io.UncheckedIOException; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| import java.util.Spliterator; |
| import java.util.stream.Stream; |
| import java.util.concurrent.atomic.AtomicInteger; |
| import org.testng.annotations.Test; |
| import static org.testng.Assert.*; |
| |
| @Test(groups = "unit") |
| public class Lines { |
| private static final Map<String, Integer> cases = new HashMap<>(); |
| |
| static { |
| cases.put("", 0); |
| cases.put("Line 1", 1); |
| cases.put("Line 1\n", 1); |
| cases.put("Line 1\n\n\n", 3); |
| cases.put("Line 1\nLine 2\nLine 3", 3); |
| cases.put("Line 1\nLine 2\nLine 3\n", 3); |
| cases.put("Line 1\n\nLine 3\n\nLine5", 5); |
| } |
| |
| /** |
| * Helper Reader class which generate specified number of lines contents |
| * with each line will be "<code>Line <line_number></code>". |
| * |
| * <p>This class also support to simulate {@link IOException} when read pass |
| * a specified line number. |
| */ |
| private static class MockLineReader extends Reader { |
| final int line_count; |
| boolean closed = false; |
| int line_no = 0; |
| String line = null; |
| int pos = 0; |
| int inject_ioe_after_line; |
| |
| MockLineReader(int cnt) { |
| this(cnt, cnt); |
| } |
| |
| MockLineReader(int cnt, int inject_ioe) { |
| line_count = cnt; |
| inject_ioe_after_line = inject_ioe; |
| } |
| |
| public void reset() { |
| synchronized(lock) { |
| line = null; |
| line_no = 0; |
| pos = 0; |
| closed = false; |
| } |
| } |
| |
| public void inject_ioe() { |
| inject_ioe_after_line = line_no; |
| } |
| |
| public int getLineNumber() { |
| synchronized(lock) { |
| return line_no; |
| } |
| } |
| |
| @Override |
| public void close() { |
| closed = true; |
| } |
| |
| @Override |
| public int read(char[] buf, int off, int len) throws IOException { |
| synchronized(lock) { |
| if (closed) { |
| throw new IOException("Stream is closed."); |
| } |
| |
| if (line == null) { |
| if (line_count > line_no) { |
| line_no += 1; |
| if (line_no > inject_ioe_after_line) { |
| throw new IOException("Failed to read line " + line_no); |
| } |
| line = "Line " + line_no + "\n"; |
| pos = 0; |
| } else { |
| return -1; // EOS reached |
| } |
| } |
| |
| int cnt = line.length() - pos; |
| assert(cnt != 0); |
| // try to fill with remaining |
| if (cnt >= len) { |
| line.getChars(pos, pos + len, buf, off); |
| pos += len; |
| if (cnt == len) { |
| assert(pos == line.length()); |
| line = null; |
| } |
| return len; |
| } else { |
| line.getChars(pos, pos + cnt, buf, off); |
| off += cnt; |
| len -= cnt; |
| line = null; |
| /* hold for next read, so we won't IOE during fill buffer |
| int more = read(buf, off, len); |
| return (more == -1) ? cnt : cnt + more; |
| */ |
| return cnt; |
| } |
| } |
| } |
| } |
| |
| private static void verify(Map.Entry<String, Integer> e) { |
| final String data = e.getKey(); |
| final int total_lines = e.getValue(); |
| try (BufferedReader br = new BufferedReader( |
| new StringReader(data))) { |
| assertEquals(br.lines() |
| .mapToInt(l -> 1).reduce(0, (x, y) -> x + y), |
| total_lines, |
| data + " should produce " + total_lines + " lines."); |
| } catch (IOException ioe) { |
| fail("Should not have any exception."); |
| } |
| } |
| |
| public void testLinesBasic() { |
| // Basic test cases |
| cases.entrySet().stream().forEach(Lines::verify); |
| // Similar test, also verify MockLineReader is correct |
| for (int i = 0; i < 10; i++) { |
| try (BufferedReader br = new BufferedReader(new MockLineReader(i))) { |
| assertEquals(br.lines() |
| .peek(l -> assertTrue(l.matches("^Line \\d+$"))) |
| .mapToInt(l -> 1).reduce(0, (x, y) -> x + y), |
| i, |
| "MockLineReader(" + i + ") should produce " + i + " lines."); |
| } catch (IOException ioe) { |
| fail("Unexpected IOException."); |
| } |
| } |
| } |
| |
| public void testUncheckedIOException() throws IOException { |
| MockLineReader r = new MockLineReader(10, 3); |
| ArrayList<String> ar = new ArrayList<>(); |
| try (BufferedReader br = new BufferedReader(r)) { |
| br.lines().limit(3L).forEach(ar::add); |
| assertEquals(ar.size(), 3, "Should be able to read 3 lines."); |
| } catch (UncheckedIOException uioe) { |
| fail("Unexpected UncheckedIOException"); |
| } |
| r.reset(); |
| try (BufferedReader br = new BufferedReader(r)) { |
| br.lines().forEach(ar::add); |
| fail("Should had thrown UncheckedIOException."); |
| } catch (UncheckedIOException uioe) { |
| assertEquals(r.getLineNumber(), 4, "should fail to read 4th line"); |
| assertEquals(ar.size(), 6, "3 + 3 lines read"); |
| } |
| for (int i = 0; i < ar.size(); i++) { |
| assertEquals(ar.get(i), "Line " + (i % 3 + 1)); |
| } |
| } |
| |
| public void testIterator() throws IOException { |
| MockLineReader r = new MockLineReader(6); |
| BufferedReader br = new BufferedReader(r); |
| String line = br.readLine(); |
| assertEquals(r.getLineNumber(), 1, "Read one line"); |
| Stream<String> s = br.lines(); |
| Iterator<String> it = s.iterator(); |
| // Ensure iterate with only next works |
| for (int i = 0; i < 5; i++) { |
| String str = it.next(); |
| assertEquals(str, "Line " + (i + 2), "Addtional five lines"); |
| } |
| // NoSuchElementException |
| try { |
| it.next(); |
| fail("Should have run out of lines."); |
| } catch (NoSuchElementException nsse) {} |
| } |
| |
| public void testPartialReadAndLineNo() throws IOException { |
| MockLineReader r = new MockLineReader(5); |
| LineNumberReader lr = new LineNumberReader(r); |
| char[] buf = new char[5]; |
| lr.read(buf, 0, 5); |
| assertEquals(0, lr.getLineNumber(), "LineNumberReader start with line 0"); |
| assertEquals(1, r.getLineNumber(), "MockLineReader start with line 1"); |
| assertEquals(new String(buf), "Line "); |
| String l1 = lr.readLine(); |
| assertEquals(l1, "1", "Remaining of the first line"); |
| assertEquals(1, lr.getLineNumber(), "Line 1 is read"); |
| assertEquals(1, r.getLineNumber(), "MockLineReader not yet go next line"); |
| lr.read(buf, 0, 4); |
| assertEquals(1, lr.getLineNumber(), "In the middle of line 2"); |
| assertEquals(new String(buf, 0, 4), "Line"); |
| ArrayList<String> ar = lr.lines() |
| .peek(l -> assertEquals(lr.getLineNumber(), r.getLineNumber())) |
| .collect(ArrayList::new, ArrayList::add, ArrayList::addAll); |
| assertEquals(ar.get(0), " 2", "Remaining in the second line"); |
| for (int i = 1; i < ar.size(); i++) { |
| assertEquals(ar.get(i), "Line " + (i + 2), "Rest are full lines"); |
| } |
| } |
| |
| public void testInterlacedRead() throws IOException { |
| MockLineReader r = new MockLineReader(10); |
| BufferedReader br = new BufferedReader(r); |
| char[] buf = new char[5]; |
| Stream<String> s = br.lines(); |
| Iterator<String> it = s.iterator(); |
| |
| br.read(buf); |
| assertEquals(new String(buf), "Line "); |
| assertEquals(it.next(), "1"); |
| try { |
| s.iterator().next(); |
| fail("Should failed on second attempt to get iterator from s"); |
| } catch (IllegalStateException ise) {} |
| br.read(buf, 0, 2); |
| assertEquals(new String(buf, 0, 2), "Li"); |
| // Get stream again should continue from where left |
| // Only read remaining of the line |
| br.lines().limit(1L).forEach(line -> assertEquals(line, "ne 2")); |
| br.read(buf, 0, 2); |
| assertEquals(new String(buf, 0, 2), "Li"); |
| br.read(buf, 0, 2); |
| assertEquals(new String(buf, 0, 2), "ne"); |
| assertEquals(it.next(), " 3"); |
| // Line 4 |
| br.readLine(); |
| // interator pick |
| assertEquals(it.next(), "Line 5"); |
| // Another stream instantiated by lines() |
| AtomicInteger line_no = new AtomicInteger(6); |
| br.lines().forEach(l -> assertEquals(l, "Line " + line_no.getAndIncrement())); |
| // Read after EOL |
| assertFalse(it.hasNext()); |
| } |
| |
| public void testCharacteristics() { |
| try (BufferedReader br = new BufferedReader( |
| new StringReader(""))) { |
| Spliterator<String> instance = br.lines().spliterator(); |
| assertTrue(instance.hasCharacteristics(Spliterator.NONNULL)); |
| assertTrue(instance.hasCharacteristics(Spliterator.ORDERED)); |
| } catch (IOException ioe) { |
| fail("Should not have any exception."); |
| } |
| } |
| } |