Resue org.apache.commons.io.input.ClosedInputStream.CLOSED_INPUT_STREAM.

Author: garydgregory

src/main/java/org/apache/commons/io/input/AutoCloseInputStream.java

@@ -62,7 +62,7 @@ public AutoCloseInputStream(final InputStream in) {
     @Override
     public void close() throws IOException {
         in.close();
-        in = new ClosedInputStream();
+        in = ClosedInputStream.CLOSED_INPUT_STREAM;
     }
 
     /**

src/main/java/org/apache/commons/io/output/AbstractByteArrayOutputStream.java

@@ -307,7 +307,7 @@ protected <T extends InputStream> InputStream toInputStream(
             final InputStreamConstructor<T> isConstructor) {
         int remaining = count;
         if (remaining == 0) {
-            return new ClosedInputStream();
+            return ClosedInputStream.CLOSED_INPUT_STREAM;
         }
         final List<T> list = new ArrayList<>(buffers.size());
         for (final byte[] buf : buffers) {

src/test/java/org/apache/commons/io/input/TaggedInputStreamTest.java

@@ -36,7 +36,7 @@ public class TaggedInputStreamTest  {
 
     @Test
     public void testEmptyStream() throws IOException {
-        final InputStream stream = new TaggedInputStream(new ClosedInputStream());
+        final InputStream stream = new TaggedInputStream(ClosedInputStream.CLOSED_INPUT_STREAM);
         assertEquals(0, stream.available());
         assertEquals(-1, stream.read());
         assertEquals(-1, stream.read(new byte[1]));
@@ -111,8 +111,7 @@ public void testBrokenStream() {
     @Test
     public void testOtherException() throws Exception {
         final IOException exception = new IOException("test exception");
-        final InputStream closed = new ClosedInputStream();
-        final TaggedInputStream stream = new TaggedInputStream(closed);
+        final TaggedInputStream stream = new TaggedInputStream(ClosedInputStream.CLOSED_INPUT_STREAM);
 
         assertFalse(stream.isCauseOf(exception));
         assertFalse(stream.isCauseOf(