textimagereader.html

Geotools是一个开源的Java GIS工具包,可利用它来开发符合标准的地理信息系统。Geotools提供了OGC(Open Geospatial Consortium)规范的一个实现来作为他们的

 <CODE>LineReader</CODE> from <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/File.html" title="class or interface in java.io"><CODE>File</CODE></A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/net/URL.html" title="class or interface in java.net"><CODE>URL</CODE></A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/Reader.html" title="class or interface in java.io"><CODE>Reader</CODE></A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/InputStream.html" title="class or interface in java.io"><CODE>InputStream</CODE></A> and
 <A HREF="http://java.sun.com/j2se/1.4/docs/api/javax/imageio/stream/ImageInputStream.html" title="class or interface in javax.imageio.stream"><CODE>ImageInputStream</CODE></A> inputs.
 <p>
 This method creates a new <CODE>LineReader</CODE> only when first invoked. All subsequent calls
 wll returns the same <CODE>LineReader</CODE>. Concequently, this reader should never be closed
 by the caller. It will be closed by methods <A HREF="../../../../org/geotools/image/io/TextImageReader.html#setInput(java.lang.Object, boolean, boolean)"><CODE>setInput(...)</CODE></A> and
 <A HREF="../../../../org/geotools/image/io/TextImageReader.html#reset()"><CODE>reset()</CODE></A>.
<P>
<DD><DL>

<DT><B>Returns:</B><DD><A HREF="http://java.sun.com/j2se/1.4/docs/api/javax/imageio/ImageReader.html#getInput()" title="class or interface in javax.imageio"><CODE>ImageReader.getInput()</CODE></A> as an <CODE>LineReader</CODE> if possible, or <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/BufferedReader.html" title="class or interface in java.io"><CODE>BufferedReader</CODE></A>
         otherwise.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE> - If the buffered reader can't be created.</DL>
</DD>
</DL>
<HR>

<A NAME="isComment(java.lang.String)"><!-- --></A><H3>
isComment</H3>
<PRE>
protected boolean <B>isComment</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A>&nbsp;line)</PRE>
<DL>
<DD>Returns  if the specified line is a comment. This method is invoked automatically
 during a <A HREF="http://java.sun.com/j2se/1.4/docs/api/javax/imageio/ImageReader.html#read(int)" title="class or interface in javax.imageio"><CODE>read</CODE></A> operation. The default implementation returns  if the
 line is empty of if the first non-whitespace character is '', and 
 otherwise. Override this method if comment lines should be determined in a different way.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>line</CODE> - A line to be parsed.
<DT><B>Returns:</B><DD> if the line is a comment and should be ignored, or  if it
         should be parsed.<DT><B>Since:</B></DT>
  <DD>2.3</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="setInput(java.lang.Object, boolean, boolean)"><!-- --></A><H3>
setInput</H3>
<PRE>
public void <B>setInput</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;input,
                     boolean&nbsp;seekForwardOnly,
                     boolean&nbsp;ignoreMetadata)</PRE>
<DL>
<DD>Sets the input source to use. If a reader were created by a previous call to
 <A HREF="../../../../org/geotools/image/io/TextImageReader.html#getReader()"><CODE>getReader()</CODE></A>, it will be closed before to change the input source.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/geotools/image/io/SimpleImageReader.html#setInput(java.lang.Object, boolean, boolean)">setInput</A></CODE> in class <CODE><A HREF="../../../../org/geotools/image/io/SimpleImageReader.html" title="class in org.geotools.image.io">SimpleImageReader</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>input</CODE> - The input object to use for future decoding.<DD><CODE>seekForwardOnly</CODE> - If , images and metadata may only be read
                        in ascending order from this input source.<DD><CODE>ignoreMetadata</CODE> - If , metadata may be ignored during reads.</DL>
</DD>
</DL>
<HR>

<A NAME="getPositionString(java.lang.String)"><!-- --></A><H3>
getPositionString</H3>
<PRE>
protected <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> <B>getPositionString</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A>&nbsp;message)</PRE>
<DL>
<DD>Returns a string representation of the current stream position. For example this method
 may returns something like . This method returns
  if the stream position is unknown.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>message</CODE> - An optional message to append to the stream position, or 
        if none.</DL>
</DD>
</DL>
<HR>

<A NAME="reset()"><!-- --></A><H3>
reset</H3>
<PRE>
public void <B>reset</B>()</PRE>
<DL>
<DD>Restores the  to its initial state. If a reader were created by a
 previous call to <A HREF="../../../../org/geotools/image/io/TextImageReader.html#getReader()"><CODE>getReader()</CODE></A>, it will be closed before to reset this reader.
<P>
<DD><DL>
</DL>
</DD>
</DL>
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