/*

 * Copyright (c) 2003, 2017, 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 4892609

 * @summary Tests that the appropriate IllegalStateException is thrown if

 *          ImageReader.getNumImages() is called with a null source or if

 *          allowSearch is specified at the same time that seekForwardOnly is

 *          true

 */

import java.io.ByteArrayInputStream;

import java.util.Iterator;

import javax.imageio.ImageIO;

import javax.imageio.ImageReader;

import javax.imageio.spi.IIORegistry;

import javax.imageio.spi.ImageReaderSpi;

import javax.imageio.stream.ImageInputStream;

public class GetNumImages {

    public static void main(String[] args) throws Exception {

        IIORegistry registry = IIORegistry.getDefaultInstance();

        // test ImageReader.getNumImages() for all available ImageReaders,

        // with no source set

        Iterator readerspis = registry.getServiceProviders(ImageReaderSpi.class,

                                                           false);

        while (readerspis.hasNext()) {

            boolean caughtEx = false;

            ImageReaderSpi readerspi = (ImageReaderSpi)readerspis.next();

            ImageReader reader = readerspi.createReaderInstance();

            try {

                reader.getNumImages(false);

            } catch (IllegalStateException ise) {

                // caught exception, everything's okay

                caughtEx = true;

            }

            if (!caughtEx) {

                throw new RuntimeException("Test failed: exception was not " +

                                           "thrown for null input: " +

                                           reader);

            }

        }

        // test ImageReader.getNumImages() for all available ImageReaders,

        // with source set, seekForwardOnly and allowSearch both true

        readerspis = registry.getServiceProviders(ImageReaderSpi.class,

                                                  false);

        while (readerspis.hasNext()) {

            boolean caughtEx = false;

            ImageReaderSpi readerspi = (ImageReaderSpi)readerspis.next();

            ImageReader reader = readerspi.createReaderInstance();

            byte[] barr = new byte[100];

            ByteArrayInputStream bais = new ByteArrayInputStream(barr);

            ImageInputStream iis = ImageIO.createImageInputStream(bais);

            try {

                reader.setInput(iis, true);

                reader.getNumImages(true);

            } catch (IllegalStateException ise) {

                // caught exception, everything's okay

                caughtEx = true;

            }

            if (!caughtEx) {

                throw new RuntimeException("Test failed: exception was not " +

                                           "thrown when allowSearch and " +

                                           "seekForwardOnly are both true: " +

                                           reader);

            }

        }

    }

}