4958064: JPGWriter does not throw UnsupportedException when canWriteSequence retuns false

Reviewed-by: prr, bae

src/share/classes/com/sun/imageio/plugins/jpeg/JPEGImageWriter.java

@@ -1104,6 +1104,11 @@ public class JPEGImageWriter extends ImageWriter {
         currentImage++;  // After a successful write
     }
 
+    @Override
+    public boolean canWriteSequence() {
+        return true;
+    }
+
     public void prepareWriteSequence(IIOMetadata streamMetadata)
         throws IOException {
         setThreadLock();

test/javax/imageio/plugins/shared/CanWriteSequence.java

+/*
+ * Copyright (c) 2015, 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.
+ */
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.util.Iterator;
+
+import javax.imageio.ImageIO;
+import javax.imageio.ImageWriter;
+import javax.imageio.metadata.IIOMetadata;
+import javax.imageio.spi.IIORegistry;
+import javax.imageio.spi.ImageWriterSpi;
+import javax.imageio.stream.ImageOutputStream;
+
+/**
+ * @test
+ * @bug 4958064
+ * @author Sergey Bylokhov
+ */
+public final class CanWriteSequence {
+
+    public static void main(final String[] args) throws Exception {
+        final IIORegistry registry = IIORegistry.getDefaultInstance();
+        final Iterator<ImageWriterSpi> iter =
+                registry.getServiceProviders(ImageWriterSpi.class,
+                        provider -> true, true);
+        // Validates all supported ImageWriters
+        while (iter.hasNext()) {
+            final ImageWriter writer = iter.next().createWriterInstance();
+            System.out.println("ImageWriter = " + writer);
+            test(writer);
+        }
+        System.out.println("Test passed");
+    }
+
+    private static void test(final ImageWriter writer) throws Exception {
+        final File file = File.createTempFile("temp", ".img");
+        file.deleteOnExit();
+        final FileOutputStream fos = new FileOutputStream(file);
+        final ImageOutputStream ios = ImageIO.createImageOutputStream(fos);
+        writer.setOutput(ios);
+        final IIOMetadata data = writer.getDefaultStreamMetadata(null);
+
+        if (writer.canWriteSequence()) {
+            writer.prepareWriteSequence(data);
+        } else {
+            try {
+                writer.prepareWriteSequence(data);
+                throw new RuntimeException(
+                        "UnsupportedOperationException was not thrown");
+            } catch (final UnsupportedOperationException ignored) {
+                // expected
+            }
+        }
+        writer.dispose();
+        ios.close();
+    }
+}
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