AudioFileWriter.java

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package javax.sound.sampled.spi;

import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;

import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;

import static javax.sound.sampled.AudioFileFormat.Type;

/**
 * Provider for audio file writing services. Classes providing concrete
 * implementations can write one or more types of audio file from an audio
 * stream.
 *
 * @author Kara Kytle
 * @since 1.3
 */
public abstract class AudioFileWriter {

    /**
     * Constructor for subclasses to call.
     */
    protected AudioFileWriter() {}

    /**
     * Obtains the file types for which file writing support is provided by this
     * audio file writer.
     *
     * @return array of file types. If no file types are supported, an array of
     *         length 0 is returned.
     */
    public abstract Type[] getAudioFileTypes();

    /**
     * Indicates whether file writing support for the specified file type is
     * provided by this audio file writer.
     *
     * @param  fileType the file type for which write capabilities are queried
     * @return {@code true} if the file type is supported, otherwise
     *         {@code false}
     * @throws NullPointerException if {@code fileType} is {@code null}
     */
    public boolean isFileTypeSupported(final Type fileType) {
        return Arrays.stream(getAudioFileTypes()).anyMatch(fileType::equals);
    }

    /**
     * Obtains the file types that this audio file writer can write from the
     * audio input stream specified.
     *
     * @param  stream the audio input stream for which audio file type support
     *         is queried
     * @return array of file types. If no file types are supported, an array of
     *         length 0 is returned.
     * @throws NullPointerException if {@code stream} is {@code null}
     */
    public abstract Type[] getAudioFileTypes(AudioInputStream stream);

    /**
     * Indicates whether an audio file of the type specified can be written from
     * the audio input stream indicated.
     *
     * @param  fileType file type for which write capabilities are queried
     * @param  stream for which file writing support is queried
     * @return {@code true} if the file type is supported for this audio input
     *         stream, otherwise {@code false}
     * @throws NullPointerException if {@code fileType} or {@code stream} are
     *         {@code null}
     */
    public boolean isFileTypeSupported(final Type fileType,
                                       final AudioInputStream stream) {
        return Arrays.stream(getAudioFileTypes(stream))
                     .anyMatch(fileType::equals);
    }

    /**
     * Writes a stream of bytes representing an audio file of the file type
     * indicated to the output stream provided. Some file types require that the
     * length be written into the file header, and cannot be written from start
     * to finish unless the length is known in advance. An attempt to write such
     * a file type will fail with an {@code IOException} if the length in the
     * audio file format is {@link AudioSystem#NOT_SPECIFIED}.
     *
     * @param  stream the audio input stream containing audio data to be written
     *         to the output stream
     * @param  fileType file type to be written to the output stream
     * @param  out stream to which the file data should be written
     * @return the number of bytes written to the output stream
     * @throws IOException if an I/O exception occurs
     * @throws IllegalArgumentException if the file type is not supported by the
     *         system
     * @throws NullPointerException if {@code stream} or {@code fileType} or
     *         {@code out} are {@code null}
     * @see #isFileTypeSupported(Type, AudioInputStream)
     * @see #getAudioFileTypes
     */
    public abstract int write(AudioInputStream stream, Type fileType,
                              OutputStream out) throws IOException;

    /**
     * Writes a stream of bytes representing an audio file of the file format
     * indicated to the external file provided.
     *
     * @param  stream the audio input stream containing audio data to be written
     *         to the file
     * @param  fileType file type to be written to the file
     * @param  out external file to which the file data should be written
     * @return the number of bytes written to the file
     * @throws IOException if an I/O exception occurs
     * @throws IllegalArgumentException if the file format is not supported by
     *         the system
     * @throws NullPointerException if {@code stream} or {@code fileType} or
     *         {@code out} are {@code null}
     * @see #isFileTypeSupported(Type, AudioInputStream)
     * @see #getAudioFileTypes
     */
    public abstract int write(AudioInputStream stream, Type fileType, File out)
            throws IOException;
}