CutLevelDescriptor.java
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/*
* ESO Archive
*
* $Id: CutLevelDescriptor.java,v 1.2 2009/02/20 23:10:11 abrighto Exp $
*
* who when what
* -------------- ---------- ----------------------------------------
* Allan Brighton 1999/05/03 Created
*/
package jsky.image.operator;
import java.lang.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.image.renderable.*;
import javax.media.jai.*;
import javax.media.jai.ROI;
import javax.media.jai.registry.RIFRegistry;
/**
* A single class that is both an OperationDescriptor and
* a RenderedImageFactory.
*/
public class CutLevelDescriptor extends OperationDescriptorImpl implements RenderedImageFactory {
/**
* The resource strings that provide the general documentation and
* specify the parameter list for the "cutlevel" operation.
*/
private static final String[][] resources = {
{"GlobalName", "cutlevel"},
{"LocalName", "cutlevel"},
{"Vendor", "jsky"},
{"Description", "Calculate image min and max values, ignoring the given blank or bad pixel value"},
{"DocURL", "http://archive.eso.org/jsky/jsky-doc/api/jsky/image/operator/CutLevelDescriptor.html"},
{"Version", "1.0"},
{"arg0Desc", "The region of the image to scan"},
{"arg1Desc", "Ignore pixels with this value."},
{"arg2Desc", "Median value (min+max/2.) to use in place of bad pixels."}
};
/**
* The modes that this operator supports. maybe one or more of
* "rendered", "renderable", "collection", and "renderableCollection".
*/
private static final String[] supportedModes = {
"rendered", "renderable"
};
/**
* The parameter names for the "cutlevel" operation.
*/
private static final String[] paramNames = {
"roi",
"ignore",
"median"
};
/**
* The class types for the parameters of the "cutlevel" operation.
* User defined classes can be used here as long as the fully
* qualified name is used and the classes can be loaded.
*/
private static final Class[] paramClasses = {
javax.media.jai.ROI.class,
java.lang.Double.class,
java.lang.Double.class
};
/**
* The default parameter values for the "cutlevel" operation
* when using a ParameterBlockJAI.
*/
private static final Object[] paramDefaults = {
null,
null,
null
};
/**
* Describes the valid parameter ranges (null means any range for that class)
*/
private static final Object[] validParamValues = {
null,
null,
null
};
/** Constructor. */
public CutLevelDescriptor() {
// XXX JAI 1.0.2 super(resources, 1, paramClasses, paramNames, paramDefaults);
super(resources, supportedModes, 1, paramNames, paramClasses, paramDefaults, validParamValues);
}
/**
* Register this operation descriptor
*/
public static void register() {
CutLevelDescriptor CutLevelDescriptor = new CutLevelDescriptor();
String operationName = "cutlevel";
String productName = "jsky";
OperationRegistry or = JAI.getDefaultInstance().getOperationRegistry();
or.registerDescriptor(CutLevelDescriptor);
RIFRegistry.register(or, operationName, productName, CutLevelDescriptor);
}
/**
* Creates a CutLevelOpImage with the given ParameterBlock if the
* CutLevelOpImage can handle the particular ParameterBlock.
*/
public RenderedImage create(ParameterBlock paramBlock,
RenderingHints renderHints) {
if (!validateParameters(paramBlock)) {
return null;
}
return new CutLevelOpImage(paramBlock.getRenderedSource(0),
(ROI) paramBlock.getObjectParameter(0),
(Double) paramBlock.getObjectParameter(1),
(Double) paramBlock.getObjectParameter(2));
}
/**
* Checks that all parameters in the ParameterBlock have the
* correct type before constructing the CutLevelOpImage
*/
public boolean validateParameters(ParameterBlock paramBlock) {
int n = getParameterListDescriptor(getSupportedModes()[0]).getNumParameters();
for (int i = 0; i < n; i++) {
Object arg = paramBlock.getObjectParameter(i);
if (arg == null) {
return false;
}
if (i == 0) {
if (!(arg instanceof ROI)) {
return false;
}
} else if (!(arg instanceof Double)) {
return false;
}
}
return true;
}
}