annotate src/samer/units/Stacker.java @ 8:5e3cbbf173aa tip

Reorganise some more

/*
 *	Copyright (c) 2000, Samer Abdallah, King's College London.
 *	All rights reserved.
 *
 *	This software is provided AS iS and WITHOUT ANY WARRANTY; 
 *	without even the implied warranty of MERCHANTABILITY or 
 *	FITNESS FOR A PARTICULAR PURPOSE.
 */

package samer.units;
import  samer.core.*;
import  samer.maths.*;
import  samer.tools.*;

/*
 *		Takes successive input vectors and stacks them into
 *		one big output vector. Requires a task which it will
 *		run to obtain each input vector.
 */

public class Stacker implements Task
{
	Node	node;
	Task	nextvec;
	Vec	srcvec;
	int	size, step;
	VVector	target;
	double []	a, b;
	int	k0, k1, k2;

	public Stacker(Vec v, Task t, int size, int step) { this(v,t,size,step,v.size()); }
	public Stacker(Vec v, Task t, int size, int step, int height)
	{
		node = new Node("stacker");

		Shell.push(node);
		srcvec=v; nextvec=t;
		this.size = size;
		this.step = step;

		k0=height;
		k1=step*k0;
		k2=(size-step)*k0;

		target = new VVector("output",k0*size);
		a = target.array();
		b = srcvec.array();
		Mathx.zero(a);

		Shell.pop();
	}

	public void dispose() {
		nextvec.dispose();
		target.dispose();
		a=b=null;
	}

	public VVector output() { return target; }

	public void starting() { nextvec.starting(); }
	public void stopping() { nextvec.stopping(); }
	public void run() throws Exception
	{
		// make some room in packed matrix
		System.arraycopy(a,k1,a,0,k2);

		for (int i=0, j=k2; i<step; i++) {
			nextvec.run();
			// copy vec into packed matrix
			System.arraycopy(b,0,a,j,k0);
			j+=k0;
		}
		target.changed();
	}
}