comparison src/samer/units/Stacker.java @ 0:bf79fb79ee13

Initial Mercurial check in.

+/*
+ *	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();
+	}
+}