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JavaCL is an Object-Oriented API that makes the C OpenCL API available to Java in a very natural way. It hides away the complexity of cross-platform C bindings, has a clean OO design (with generics, Java enums, NIO buffers, fully typed exceptions...), provides high-level features (OpenGL-interop, array reductions) and comes with samples and demos. For more info, please visit http://code.google.com/p/nativelibs4java/wiki/OpenCL.

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package com.nativelibs4java.opencl.util.fft;
import com.nativelibs4java.opencl.CLAbstractUserProgram;
import com.nativelibs4java.opencl.CLBuffer;
import com.nativelibs4java.opencl.CLBuildException;
import com.nativelibs4java.opencl.CLContext;
import com.nativelibs4java.opencl.CLEvent;
import com.nativelibs4java.opencl.CLKernel;
import com.nativelibs4java.opencl.CLProgram;
import com.nativelibs4java.opencl.CLQueue;
import java.io.IOException;
/// Wrapper around the OpenCL program FloatDFTProgram
public class FloatDFTProgram extends CLAbstractUserProgram {
	public FloatDFTProgram(CLContext context) throws IOException {
		super(context, readRawSourceForClass(FloatDFTProgram.class));
	}
	public FloatDFTProgram(CLProgram program) throws IOException {
		super(program, readRawSourceForClass(FloatDFTProgram.class));
	}
	CLKernel dft_kernel;
	public synchronized CLEvent dft(CLQueue commandQueue, CLBuffer in, CLBuffer out, int length, int sign, int globalWorkSizes[], int localWorkSizes[], CLEvent... eventsToWaitFor) throws CLBuildException {
		if (dft_kernel == null) 
			dft_kernel = createKernel("dft");
		dft_kernel.setArgs(in, out, length, sign);
		return dft_kernel.enqueueNDRange(commandQueue, globalWorkSizes, localWorkSizes, eventsToWaitFor);
	}
}