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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Sat May 20 18:57:54 PDT 2000 --><TITLE>: Class DataSource</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../overview-summary.html"><FONT ID="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT ID="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT ID="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../deprecated-list.html"><FONT ID="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../index-all.html"><FONT ID="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../help-doc.html"><FONT ID="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../javax/media/protocol/ContentDescriptor.html"><B>PREV CLASS</B></A> <A HREF="../../../javax/media/protocol/FileTypeDescriptor.html"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="DataSource.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">javax.media.protocol</FONT><BR>Class DataSource</H2><PRE>java.lang.Object | +--<B>javax.media.protocol.DataSource</B></PRE><DL><DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../javax/media/protocol/PullBufferDataSource.html">PullBufferDataSource</A>, <A HREF="../../../javax/media/protocol/PullDataSource.html">PullDataSource</A>, <A HREF="../../../javax/media/protocol/PushBufferDataSource.html">PushBufferDataSource</A>, <A HREF="../../../javax/media/protocol/PushDataSource.html">PushDataSource</A></DD></DL><HR><DL><DT>public abstract class <B>DataSource</B><DT>extends java.lang.Object<DT>implements <A HREF="../../../javax/media/protocol/Controls.html">Controls</A>, <A HREF="../../../javax/media/Duration.html">Duration</A></DL><P>A <CODE>DataSource</CODE> is an abstraction for media protocol-handlers. <CODE>DataSource</CODE> manages the life-cycle of the media source by providing a simple connection protocol. <h2>Source Controls</h2> A <code>DataSource</code> might support an operation that is not part of the <code>DataSource</code> class definition. For example a source could support positioning its media to a particular time. Some operations are dependent on the data stream that the source is managing, and support cannot be determined until after the source has been connected. <p> To obtain all of the objects that provide control over a <code>DataSource</code>, use <code>getControls</code> which returns an array of <code>Object</code> To determine if a particular kind of control is available and obtain the object that implements it, use <code>getControl</code> which takes the name of the Class or Interface that of the desired control. <h2>DataSource Properties</h2> A <code>DataSource</code> may implement the following few well-defined interfaces: <br> <code>Positionable</code>: if the <code>DataSource</code> can be positioned. <br> <code>RateConfigureable</code>: if the <code>DataSource</code> supports different playback rates. <br> <code>SourceCloneable</code>: if the <code>DataSource</code> can be cloned. <br> <code>CaptureDevice</code>: if the <code>DataSource</code> is a capture device.<P><DL><DT><B>See Also: </B><DD><A HREF="../../../javax/media/Manager.html"><CODE>Manager</CODE></A>, <A HREF="../../../javax/media/protocol/Positionable.html"><CODE>Positionable</CODE></A>, <A HREF="../../../javax/media/protocol/RateConfigureable.html"><CODE>RateConfigureable</CODE></A>, <A HREF="../../../javax/media/protocol/CaptureDevice.html"><CODE>CaptureDevice</CODE></A>, <A HREF="../../../javax/media/protocol/SourceCloneable.html"><CODE>SourceCloneable</CODE></A></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><A NAME="fields_inherited_from_class_javax.media.Duration"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from interface javax.media.<A HREF="../../../javax/media/Duration.html">Duration</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../javax/media/Duration.html#DURATION_UNBOUNDED">DURATION_UNBOUNDED</A>, <A HREF="../../../javax/media/Duration.html#DURATION_UNKNOWN">DURATION_UNKNOWN</A></CODE></TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../javax/media/protocol/DataSource.html#DataSource()">DataSource</A></B>()</CODE><BR> A no-argument constructor required by pre 1.1 implementations so that this class can be instantiated by calling <CODE>Class.newInstance</CODE>.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../javax/media/protocol/DataSource.html#DataSource(javax.media.MediaLocator)">DataSource</A></B>(<A HREF="../../../javax/media/MediaLocator.html">MediaLocator</A> source)</CODE><BR> Construct a <CODE>DataSource</CODE> from a <CODE>MediaLocator</CODE>.</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>abstract void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/protocol/DataSource.html#connect()">connect</A></B>()</CODE><BR> Open a connection to the source described by the <CODE>MediaLocator</CODE>.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>abstract void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/protocol/DataSource.html#disconnect()">disconnect</A></B>()</CODE><BR> Close the connection to the source described by the locator.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>abstract java.lang.String</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/protocol/DataSource.html#getContentType()">getContentType</A></B>()</CODE><BR> Get a string that describes the content-type of the media that the source is providing.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../javax/media/MediaLocator.html">MediaLocator</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/protocol/DataSource.html#getLocator()">getLocator</A></B>()</CODE><BR> Get the <CODE>MediaLocator</CODE> that describes this source.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/protocol/DataSource.html#initCheck()">initCheck</A></B>()</CODE><BR> Check to see if this connection has been initialized with a <CODE>MediaLocator</CODE>.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/protocol/DataSource.html#setLocator(javax.media.MediaLocator)">setLocator</A></B>(<A HREF="../../../javax/media/MediaLocator.html">MediaLocator</A> source)</CODE><BR> Set the connection <CODE>source</CODE> for this <CODE>DataSource</CODE>.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>abstract void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/protocol/DataSource.html#start()">start</A></B>()</CODE><BR> Initiate data-transfer.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>abstract void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/protocol/DataSource.html#stop()">stop</A></B>()</CODE><BR> Stop the data-transfer.</TD></TR></TABLE> <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from class java.lang.Object</B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE>clone, equals, ⌨️ 快捷键说明
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