ExpectedNPEOnNull.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.OutputStream;
import java.util.Objects;

import javax.sound.midi.MidiSystem;
import javax.sound.midi.Sequence;
import javax.sound.midi.spi.MidiFileWriter;

import static java.util.ServiceLoader.load;

/**
 * @test
 * @bug 8143909
 * @author Sergey Bylokhov
 */
public final class ExpectedNPEOnNull {

    public static void main(final String[] args) throws Exception {
        testMS();
        for (final MidiFileWriter mfw : load(MidiFileWriter.class)) {
            testMFW(mfw);
        }
        testMFW(customMFW);
    }

    /**
     * Tests the part of MidiSystem API, which implemented via MidiFileWriter.
     */
    private static void testMS() throws Exception {
        // MidiSystem#getMidiFileTypes(Sequence)
        try {
            MidiSystem.getMidiFileTypes(null);
            throw new RuntimeException("NPE is expected");
        } catch (final NullPointerException ignored) {
        }

        // MidiSystem#isFileTypeSupported(int, Sequence)
        for (final int type : MidiSystem.getMidiFileTypes()) {
            try {
                MidiSystem.isFileTypeSupported(type, null);
                throw new RuntimeException("NPE is expected");
            } catch (final NullPointerException ignored) {
            }
        }
        // MidiSystem#write(Sequence, int, OutputStream)
        for (final int type : MidiSystem.getMidiFileTypes()) {
            try {
                MidiSystem.write(null, type, new NullOutputStream());
                throw new RuntimeException("NPE is expected");
            } catch (final NullPointerException ignored) {
            }
        }
        for (final int type : MidiSystem.getMidiFileTypes()) {
            try {
                MidiSystem.write(new Sequence(0, 0), type, (OutputStream) null);
                throw new RuntimeException("NPE is expected");
            } catch (final NullPointerException ignored) {
            }
        }
        for (final int type : MidiSystem.getMidiFileTypes()) {
            try {
                MidiSystem.write(null, type, (OutputStream) null);
                throw new RuntimeException("NPE is expected");
            } catch (final NullPointerException ignored) {
            }
        }
        // MidiSystem#write(Sequence, int, File)
        for (final int type : MidiSystem.getMidiFileTypes()) {
            try {
                MidiSystem.write(null, type, new File(""));
                throw new RuntimeException("NPE is expected");
            } catch (final NullPointerException ignored) {
            }
        }
        for (final int type : MidiSystem.getMidiFileTypes()) {
            try {
                MidiSystem.write(new Sequence(0, 0), type, (File) null);
                throw new RuntimeException("NPE is expected");
            } catch (final NullPointerException ignored) {
            }
        }
        for (final int type : MidiSystem.getMidiFileTypes()) {
            try {
                MidiSystem.write(null, type, (File) null);
                throw new RuntimeException("NPE is expected");
            } catch (final NullPointerException ignored) {
            }
        }
    }

    /**
     * Tests the MidiFileWriter API directly.
     */
    private static void testMFW(final MidiFileWriter mfw) throws Exception {
        // MidiFileWriter#getMidiFileTypes(Sequence)
        try {
            mfw.getMidiFileTypes(null);
            throw new RuntimeException("NPE is expected");
        } catch (final NullPointerException ignored) {
        }
        // MidiFileWriter#isFileTypeSupported(int, Sequence)
        for (final int type : MidiSystem.getMidiFileTypes()) {
            try {
                mfw.isFileTypeSupported(type, null);
                throw new RuntimeException("NPE is expected");
            } catch (final NullPointerException ignored) {
            }
        }
        // MidiFileWriter#write(Sequence, int, OutputStream)
        for (final int type : MidiSystem.getMidiFileTypes()) {
            try {
                mfw.write(null, type, new NullOutputStream());
                throw new RuntimeException("NPE is expected");
            } catch (final NullPointerException ignored) {
            }
        }
        for (final int type : MidiSystem.getMidiFileTypes()) {
            try {
                mfw.write(new Sequence(0, 0), type, (OutputStream) null);
                throw new RuntimeException("NPE is expected");
            } catch (final NullPointerException ignored) {
            }
        }
        for (final int type : MidiSystem.getMidiFileTypes()) {
            try {
                mfw.write(null, type, (OutputStream) null);
                throw new RuntimeException("NPE is expected");
            } catch (final NullPointerException ignored) {
            }
        }
        // MidiFileWriter#write(Sequence, int, File)
        for (final int type : MidiSystem.getMidiFileTypes()) {
            try {
                mfw.write(null, type, new File(""));
                throw new RuntimeException("NPE is expected");
            } catch (final NullPointerException ignored) {
            }
        }
        for (final int type : MidiSystem.getMidiFileTypes()) {
            try {
                mfw.write(new Sequence(0, 0), type, (File) null);
                throw new RuntimeException("NPE is expected");
            } catch (final NullPointerException ignored) {
            }
        }
        for (final int type : MidiSystem.getMidiFileTypes()) {
            try {
                mfw.write(null, type, (File) null);
                throw new RuntimeException("NPE is expected");
            } catch (final NullPointerException ignored) {
            }
        }
    }
    /**
     * Tests some default implementation of MidiFileWriter API, using the custom
     * {@code MidiFileWriter}, which support nothing.
     */
    static MidiFileWriter customMFW = new MidiFileWriter() {
        @Override
        public int[] getMidiFileTypes() {
            return new int[0];
        }

        @Override
        public int[] getMidiFileTypes(Sequence sequence) {
            Objects.requireNonNull(sequence);
            return new int[0];
        }

        @Override
        public int write(Sequence in, int fileType, OutputStream out) {
            Objects.requireNonNull(in);
            Objects.requireNonNull(out);
            return 0;
        }

        @Override
        public int write(Sequence in, int fileType, File out) {
            Objects.requireNonNull(in);
            Objects.requireNonNull(out);
            return 0;
        }
    };

    private static final class NullOutputStream extends OutputStream {

        @Override
        public void write(final int b) {
            //do nothing
        }
    }
}