jdk/src/share/classes/javax/sound/sampled/Port.java

/*
 * Copyright 1999-2004 Sun Microsystems, Inc.  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.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 */

package javax.sound.sampled;


/**
 * Ports are simple lines for input or output of audio to or from audio devices.
 * Common examples of ports that act as source lines (mixer inputs) include the microphone,
 * line input, and CD-ROM drive.  Ports that act as target lines (mixer outputs) include the
 * speaker, headphone, and line output.  You can access port using a <code>{@link Port.Info}</code>
 * object.
 *
 * @author Kara Kytle
 * @since 1.3
 */
public interface Port extends Line {


    // INNER CLASSES


    /**
     * The <code>Port.Info</code> class extends <code>{@link Line.Info}</code>
     * with additional information specific to ports, including the port's name
     * and whether it is a source or a target for its mixer.
     * By definition, a port acts as either a source or a target to its mixer,
     * but not both.  (Audio input ports are sources; audio output ports are targets.)
     * <p>
     * To learn what ports are available, you can retrieve port info objects through the
     * <code>{@link Mixer#getSourceLineInfo getSourceLineInfo}</code> and
     * <code>{@link Mixer#getTargetLineInfo getTargetLineInfo}</code>
     * methods of the <code>Mixer</code> interface.  Instances of the
     * <code>Port.Info</code> class may also be constructed and used to obtain
     * lines matching the parameters specified in the <code>Port.Info</code> object.
     *
     * @author Kara Kytle
     * @since 1.3
     */
    public static class Info extends Line.Info {


        // AUDIO PORT TYPE DEFINES


        // SOURCE PORTS

        /**
         * A type of port that gets audio from a built-in microphone or a microphone jack.
         */
        public static final Info MICROPHONE = new Info(Port.class,"MICROPHONE", true);

        /**
         * A type of port that gets audio from a line-level audio input jack.
         */
        public static final Info LINE_IN = new Info(Port.class,"LINE_IN", true);

        /**
         * A type of port that gets audio from a CD-ROM drive.
         */
        public static final Info COMPACT_DISC = new Info(Port.class,"COMPACT_DISC", true);


        // TARGET PORTS

        /**
         * A type of port that sends audio to a built-in speaker or a speaker jack.
         */
        public static final Info SPEAKER = new Info(Port.class,"SPEAKER", false);

        /**
         * A type of port that sends audio to a headphone jack.
         */
        public static final Info HEADPHONE = new Info(Port.class,"HEADPHONE", false);

        /**
         * A type of port that sends audio to a line-level audio output jack.
         */
        public static final Info LINE_OUT = new Info(Port.class,"LINE_OUT", false);


        // FUTURE DIRECTIONS...

        // telephone
        // DAT
        // DVD


        // INSTANCE VARIABLES

        private String name;
        private boolean isSource;


        // CONSTRUCTOR

        /**
         * Constructs a port's info object from the information given.
         * This constructor is typically used by an implementation
         * of Java Sound to describe a supported line.
         *
         * @param lineClass the class of the port described by the info object.
         * @param name the string that names the port
         * @param isSource <code>true</code> if the port is a source port (such
         * as a microphone), <code>false</code> if the port is a target port
         * (such as a speaker).
         */
        public Info(Class<?> lineClass, String name, boolean isSource) {

            super(lineClass);
            this.name = name;
            this.isSource = isSource;
        }


        // METHODS

        /**
         * Obtains the name of the port.
         * @return the string that names the port
         */
        public String getName() {
            return name;
        }

        /**
         * Indicates whether the port is a source or a target for its mixer.
         * @return <code>true</code> if the port is a source port (such
         * as a microphone), <code>false</code> if the port is a target port
         * (such as a speaker).
         */
        public boolean isSource() {
            return isSource;
        }

        /**
         * Indicates whether this info object specified matches this one.
         * To match, the match requirements of the superclass must be
         * met and the types must be equal.
         * @param info the info object for which the match is queried
         */
        public boolean matches(Line.Info info) {

            if (! (super.matches(info)) ) {
                return false;
            }

            if (!(name.equals(((Info)info).getName())) ) {
                return false;
            }

            if (! (isSource == ((Info)info).isSource()) ) {
                return false;
            }

            return true;
        }


        /**
         * Finalizes the equals method
         */
        public final boolean equals(Object obj) {
            return super.equals(obj);
        }

        /**
         * Finalizes the hashCode method
         */
        public final int hashCode() {
            return super.hashCode();
        }



        /**
         * Provides a <code>String</code> representation
         * of the port.
         * @return  a string that describes the port
         */
        public final String toString() {
            return (name + ((isSource == true) ? " source" : " target") + " port");
        }

    } // class Info
}