1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
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  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
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  25 
  26 package javax.sound.sampled.spi;
  27 
  28 import java.util.Arrays;
  29 
  30 import javax.sound.sampled.Mixer;
  31 
  32 /**
  33  * A provider or factory for a particular mixer type. This mechanism allows the
  34  * implementation to determine how resources are managed in creation /
  35  * management of a mixer.
  36  *
  37  * @author Kara Kytle
  38  * @since 1.3
  39  */
  40 public abstract class MixerProvider {
  41 
  42     /**
  43      * Constructs a {@code MixerProvider}.
  44      */
  45     protected MixerProvider() {}
  46 
  47     /**
  48      * Indicates whether the mixer provider supports the mixer represented by
  49      * the specified mixer info object.
  50      * <p>
  51      * The full set of mixer info objects that represent the mixers supported by
  52      * this {@code MixerProvider} may be obtained through the
  53      * {@code getMixerInfo} method.
  54      *
  55      * @param  info an info object that describes the mixer for which support is
  56      *         queried
  57      * @return {@code true} if the specified mixer is supported, otherwise
  58      *         {@code false}
  59      * @throws NullPointerException if {@code info} is {@code null}
  60      * @see #getMixerInfo()
  61      */
  62     public boolean isMixerSupported(final Mixer.Info info) {
  63         return Arrays.stream(getMixerInfo()).anyMatch(info::equals);
  64     }
  65 
  66     /**
  67      * Obtains the set of info objects representing the mixer or mixers provided
  68      * by this MixerProvider.
  69      * <p>
  70      * The {@code isMixerSupported} method returns {@code true} for all the info
  71      * objects returned by this method. The corresponding mixer instances for
  72      * the info objects are returned by the {@code getMixer} method.
  73      *
  74      * @return a set of mixer info objects
  75      * @see #getMixer(Mixer.Info)
  76      * @see #isMixerSupported(Mixer.Info)
  77      */
  78     public abstract Mixer.Info[] getMixerInfo();
  79 
  80     /**
  81      * Obtains an instance of the mixer represented by the info object. If
  82      * {@code null} is passed, then the default mixer will be returned.
  83      * <p>
  84      * The full set of the mixer info objects that represent the mixers
  85      * supported by this {@code MixerProvider} may be obtained through the
  86      * {@code getMixerInfo} method. Use the {@code isMixerSupported} method to
  87      * test whether this {@code MixerProvider} supports a particular mixer.
  88      *
  89      * @param  info an info object that describes the desired mixer, or
  90      *         {@code null} for the default mixer
  91      * @return mixer instance
  92      * @throws IllegalArgumentException if the info object specified does not
  93      *         match the info object for a mixer supported by this
  94      *         {@code MixerProvider}, or if this {@code MixerProvider} does not
  95      *         have default mixer, but default mixer has been requested
  96      * @see #getMixerInfo()
  97      * @see #isMixerSupported(Mixer.Info)
  98      */
  99     public abstract Mixer getMixer(Mixer.Info info);
 100 }