defaultprocessor.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

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<TD><CODE><A HREF="../../../../org/geotools/coverage/processing/AbstractProcessor.html#getInstance()">getInstance</A>, <A HREF="../../../../org/geotools/coverage/processing/AbstractProcessor.html#getLocale()">getLocale</A>, <A HREF="../../../../org/geotools/coverage/processing/AbstractProcessor.html#listOperations(java.io.Writer)">listOperations</A>, <A HREF="../../../../org/geotools/coverage/processing/AbstractProcessor.html#main(java.lang.String[])">main</A>, <A HREF="../../../../org/geotools/coverage/processing/AbstractProcessor.html#printOperations(java.io.Writer, java.lang.String[])">printOperations</A></CODE></TD>
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<TD><B>Methods inherited from class <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></B></TD>
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<B>Constructor Detail</B></FONT></TD>
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<A NAME="DefaultProcessor(java.awt.RenderingHints)"><!-- --></A><H3>
DefaultProcessor</H3>
<PRE>
public <B>DefaultProcessor</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/RenderingHints.html" title="class or interface in java.awt">RenderingHints</A>&nbsp;hints)</PRE>
<DL>
<DD>Constructs a default coverage processor. The <A HREF="../../../../org/geotools/coverage/processing/DefaultProcessor.html#scanForPlugins()"><CODE>scanForPlugins()</CODE></A> method will be
 automatically invoked the first time an operation is required. Additional operations
 can be added by subclasses with the <A HREF="../../../../org/geotools/coverage/processing/DefaultProcessor.html#addOperation(org.opengis.coverage.processing.Operation)"><CODE>addOperation(org.opengis.coverage.processing.Operation)</CODE></A> method. Rendering hints will
 be initialized with the following hints:
 <p>
 <ul>
   <li><A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/JAI.html#KEY_REPLACE_INDEX_COLOR_MODEL" title="class or interface in javax.media.jai"><CODE>JAI.KEY_REPLACE_INDEX_COLOR_MODEL</CODE></A> set to <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Boolean.html#FALSE" title="class or interface in java.lang"><CODE>Boolean.FALSE</CODE></A>.</li>
   <li><A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/JAI.html#KEY_TRANSFORM_ON_COLORMAP" title="class or interface in javax.media.jai"><CODE>JAI.KEY_TRANSFORM_ON_COLORMAP</CODE></A> set to <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Boolean.html#FALSE" title="class or interface in java.lang"><CODE>Boolean.FALSE</CODE></A>.</li>
 </ul>
<P>
<DT><B>Parameters:</B><DD><CODE>hints</CODE> - A set of additional rendering hints, or  if none.</DL>

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<A NAME="addOperation(org.opengis.coverage.processing.Operation)"><!-- --></A><H3>
addOperation</H3>
<PRE>
protected void <B>addOperation</B>(Operation&nbsp;operation)
                     throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/IllegalStateException.html" title="class or interface in java.lang">IllegalStateException</A></PRE>
<DL>
<DD>Add the specified operation to this processor. This method is usually invoked
 at construction time before this processor is made accessible.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>operation</CODE> - The operation to add.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/IllegalStateException.html" title="class or interface in java.lang">IllegalStateException</A></CODE> - if an operation already exists with the same name.</DL>
</DD>
</DL>
<HR>

<A NAME="getOperations()"><!-- --></A><H3>
getOperations</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A> <B>getOperations</B>()</PRE>
<DL>
<DD>Retrieves grid processing operations information. Each operation information contains
 the name of the operation as well as a list of its parameters.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/geotools/coverage/processing/AbstractProcessor.html#getOperations()">getOperations</A></CODE> in class <CODE><A HREF="../../../../org/geotools/coverage/processing/AbstractProcessor.html" title="class in org.geotools.coverage.processing">AbstractProcessor</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getOperation(java.lang.String)"><!-- --></A><H3>
getOperation</H3>
<PRE>
public Operation <B>getOperation</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;name)
                                                       throws OperationNotFoundException</PRE>
<DL>
<DD>Returns the operation for the specified name.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/geotools/coverage/processing/AbstractProcessor.html#getOperation(java.lang.String)">getOperation</A></CODE> in class <CODE><A HREF="../../../../org/geotools/coverage/processing/AbstractProcessor.html" title="class in org.geotools.coverage.processing">AbstractProcessor</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - Name of the operation (case insensitive).
<DT><B>Returns:</B><DD>The operation for the given name.
<DT><B>Throws:</B>
<DD><CODE>OperationNotFoundException</CODE> - if there is no operation for the specified name.</DL>
</DD>
</DL>
<HR>

<A NAME="getRenderingHint(java.awt.RenderingHints.Key)"><!-- --></A><H3>
getRenderingHint</H3>
<PRE>
public final <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> <B>getRenderingHint</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/RenderingHints.Key.html" title="class or interface in java.awt">RenderingHints.Key</A>&nbsp;key)</PRE>
<DL>
<DD>Returns a rendering hint.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - The hint key (e.g. <A HREF="../../../../org/geotools/factory/Hints.html#JAI_INSTANCE"><CODE>Hints.JAI_INSTANCE</CODE></A>).
<DT><B>Returns:</B><DD>The hint value for the specified key, or  if there is no hint for the
         specified key.</DL>
</DD>
</DL>
<HR>

<A NAME="doOperation(org.opengis.parameter.ParameterValueGroup)"><!-- --></A><H3>
doOperation</H3>
<PRE>
public Coverage <B>doOperation</B>(ParameterValueGroup&nbsp;parameters)
                                          throws OperationNotFoundException</PRE>
<DL>
<DD>Applies a process operation to a coverage. The default implementation checks if source
 coverages use an interpolation, and then invokes <A HREF="../../../../org/geotools/coverage/processing/AbstractOperation.html#doOperation(org.opengis.parameter.ParameterValueGroup, org.geotools.factory.Hints)"><CODE>AbstractOperation.doOperation(org.opengis.parameter.ParameterValueGroup, org.geotools.factory.Hints)</CODE></A>.
 If all source coverages used the same interpolation, then this interpolation is applied
 to the resulting coverage (except if the resulting coverage has already an interpolation).
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/geotools/coverage/processing/AbstractProcessor.html#doOperation(org.opengis.parameter.ParameterValueGroup)">doOperation</A></CODE> in class <CODE><A HREF="../../../../org/geotools/coverage/processing/AbstractProcessor.html" title="class in org.geotools.coverage.processing">AbstractProcessor</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>parameters</CODE> - Parameters required for the operation. The easiest way to construct them
         is to invoke <code>operation.<CODE>getParameters</CODE>()</code>
         and to modify the returned group.
<DT><B>Returns:</B><DD>The result as a coverage.
<DT><B>Throws:</B>
<DD><CODE>OperationNotFoundException</CODE> - if there is no operation for the parameter group name.</DL>
</DD>
</DL>
<HR>

<A NAME="scanForPlugins()"><!-- --></A><H3>
scanForPlugins</H3>
<PRE>
public void <B>scanForPlugins</B>()</PRE>
<DL>
<DD>Scans for factory plug-ins on the application class path. This method is needed because the
 application class path can theoretically change, or additional plug-ins may become available.
 Rather than re-scanning the classpath on every invocation of the API, the class path is
 scanned automatically only on the first invocation. Clients can call this method to prompt
 a re-scan. Thus this method need only be invoked by sophisticated applications which
 dynamically make new plug-ins available at runtime.
<P>
<DD><DL>
</DL>
</DD>
</DL>
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