OperationConstCRIF.java

/* JAI-Ext - OpenSource Java Advanced Image Extensions Library
 *    http://www.geo-solutions.it/
 *    Copyright 2014 GeoSolutions


 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at

 * http://www.apache.org/licenses/LICENSE-2.0

 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package it.geosolutions.jaiext.algebra.constant;

import it.geosolutions.jaiext.algebra.AlgebraDescriptor.Operator;
import it.geosolutions.jaiext.range.Range;

import java.awt.RenderingHints;
import java.awt.image.RenderedImage;
import java.awt.image.renderable.ParameterBlock;
import java.awt.image.renderable.RenderedImageFactory;

import javax.media.jai.CRIFImpl;
import javax.media.jai.ImageLayout;
import javax.media.jai.ROI;

import com.sun.media.jai.opimage.RIFUtil;

/**
 * {@link RenderedImageFactory} implementation for the OperationConst operation
 * 
 * @author Nicola Lagomarsini geosolutions
 * 
 */
public class OperationConstCRIF extends CRIFImpl {

	/** Constructor. */
	public OperationConstCRIF() {
		super("operationConst");
	}

	/**
	 * Creates a new instance of <code>OperationConstOpImage</code> in the
	 * rendered layer. This method satisfies the implementation of RIF.
	 * 
	 * @param paramBlock
	 *            The two source images to be added.
	 * @param renderHints
	 *            Optionally contains destination image layout.
	 */
	public RenderedImage create(ParameterBlock pb, RenderingHints renderHints) {
		// Get ImageLayout from renderHints if any.
		ImageLayout layout = RIFUtil.getImageLayoutHint(renderHints);
		// Getting the source
		RenderedImage source = pb.getRenderedSource(0);
		// Getting the parameters
		Operator op = (Operator) pb.getObjectParameter(1);
		// Check for the constants
		double[] constants = null;
                Object param = pb.getObjectParameter(0);
                if (param != null) {
                    if (param instanceof double[]) {
                        constants = (double[]) param;
                    } else if (param instanceof int[]) {
                        int[] paramInt = (int[]) param;
                        constants = new double[paramInt.length];
                        for (int i = 0; i < paramInt.length; i++) {
                            constants[i] = paramInt[i];
                        }
                    }
                }

		ROI roi = (ROI) pb.getObjectParameter(2);
		Range noData = (Range) pb.getObjectParameter(3);
		double destinationNoData = 0;
		int numParams = pb.getNumParameters();
		if(numParams > 4){
		    destinationNoData = pb.getDoubleParameter(4);
		}

		return new OperationConstOpImage(source, renderHints, layout, op,
				constants, roi, noData, destinationNoData);
	}

}