abstractloader.html

weka是机器学习和数据挖掘领域最有影响力的开源项目之一

<DD><DL>
<DT><B>Parameters:</B><DD><CODE>file</CODE> - the File
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - always</DL>
</DD>
</DL>
<HR>

<A NAME="reset()"><!-- --></A><H3>
reset</H3>
<PRE>
public void <B>reset</B>()
           throws java.lang.Exception</PRE>
<DL>
<DD>Default implementation sets retrieval mode to NONE
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../weka/core/converters/Loader.html#reset()">reset</A></CODE> in interface <CODE><A HREF="../../../weka/core/converters/Loader.html" title="interface in weka.core.converters">Loader</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE>never.</CODE>
<DD><CODE>java.lang.Exception</CODE> - if Loader can't be reset for some reason.</DL>
</DD>
</DL>
<HR>

<A NAME="setSource(java.io.InputStream)"><!-- --></A><H3>
setSource</H3>
<PRE>
public void <B>setSource</B>(java.io.InputStream&nbsp;input)
               throws java.io.IOException</PRE>
<DL>
<DD>Default implementation throws an IOException.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../weka/core/converters/Loader.html#setSource(java.io.InputStream)">setSource</A></CODE> in interface <CODE><A HREF="../../../weka/core/converters/Loader.html" title="interface in weka.core.converters">Loader</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>input</CODE> - the input stream
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - always</DL>
</DD>
</DL>
<HR>

<A NAME="getStructure()"><!-- --></A><H3>
getStructure</H3>
<PRE>
public abstract <A HREF="../../../weka/core/Instances.html" title="class in weka.core">Instances</A> <B>getStructure</B>()
                                throws java.io.IOException</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../weka/core/converters/Loader.html#getStructure()">Loader</A></CODE></B></DD>
<DD>Determines and returns (if possible) the structure (internally the 
 header) of the data set as an empty set of instances.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../weka/core/converters/Loader.html#getStructure()">getStructure</A></CODE> in interface <CODE><A HREF="../../../weka/core/converters/Loader.html" title="interface in weka.core.converters">Loader</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the structure of the data set as an empty set of Instances
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - if there is no source or parsing fails

 <pre><jml>
    public_normal_behavior
      requires: model_sourceSupplied == true
                && model_structureDetermined == false
                && (* successful parse *);
      modifiable: model_structureDetermined;
      ensures: \result != null
               && \result.numInstances() == 0
               && model_structureDetermined == true;
  also
    public_exceptional_behavior
      requires: model_sourceSupplied == false
                || (* unsuccessful parse *);
      signals: (IOException);
 </jml></pre></DL>
</DD>
</DL>
<HR>

<A NAME="getDataSet()"><!-- --></A><H3>
getDataSet</H3>
<PRE>
public abstract <A HREF="../../../weka/core/Instances.html" title="class in weka.core">Instances</A> <B>getDataSet</B>()
                              throws java.io.IOException</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../weka/core/converters/Loader.html#getDataSet()">Loader</A></CODE></B></DD>
<DD>Return the full data set. If the structure hasn't yet been determined
 by a call to getStructure then the method should do so before processing
 the rest of the data set.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../weka/core/converters/Loader.html#getDataSet()">getDataSet</A></CODE> in interface <CODE><A HREF="../../../weka/core/converters/Loader.html" title="interface in weka.core.converters">Loader</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the full data set as an Instances object
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - if there is an error during parsing or if 
 getNextInstance has been called on this source (either incremental
 or batch loading can be used, not both).

 <pre><jml>
    public_normal_behavior
      requires: model_sourceSupplied == true
                && (* successful parse *);
      modifiable: model_structureDetermined;
      ensures: \result != null
               && \result.numInstances() >= 0
               && model_structureDetermined == true;
  also
    public_exceptional_behavior
      requires: model_sourceSupplied == false
                || (* unsuccessful parse *);
      signals: (IOException);
 </jml></pre></DL>
</DD>
</DL>
<HR>

<A NAME="getNextInstance()"><!-- --></A><H3>
getNextInstance</H3>
<PRE>
public abstract <A HREF="../../../weka/core/Instance.html" title="class in weka.core">Instance</A> <B>getNextInstance</B>()
                                  throws java.io.IOException</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../weka/core/converters/Loader.html#getNextInstance()">Loader</A></CODE></B></DD>
<DD>Read the data set incrementally---get the next instance in the data 
 set or returns null if there are no
 more instances to get. If the structure hasn't yet been 
 determined by a call to getStructure then method should do so before
 returning the next instance in the data set.

 If it is not possible to read the data set incrementally (ie. in cases
 where the data set structure cannot be fully established before all
 instances have been seen) then an exception should be thrown.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../weka/core/converters/Loader.html#getNextInstance()">getNextInstance</A></CODE> in interface <CODE><A HREF="../../../weka/core/converters/Loader.html" title="interface in weka.core.converters">Loader</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the next instance in the data set as an Instance object or null
 if there are no more instances to be read
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - if there is an error during parsing or if
 getDataSet has been called on this source (either incremental
 or batch loading can be used, not both).

 <pre><jml>
    public_normal_behavior
    {|
       requires: model_sourceSupplied == true
                 && (* successful parse *);
       modifiable: model_structureDetermined;
       ensures: model_structureDetermined == true
                && \result != null;
     also
       requires: model_sourceSupplied == true
                 && (* no further input *);
       modifiable: model_structureDetermined;
       ensures: model_structureDetermined == true
                && \result == null;
    |}
  also
    public_exceptional_behavior
    {|
       requires: model_sourceSupplied == false
                 || (* unsuccessful parse *);
       signals: (IOException);
     also
       requires: (* unable to process data set incrementally *);
       signals: (IOException);
    |}
 </jml></pre></DL>
</DD>
</DL>
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