org.jcsp.plugNplay.ints

Class Merge2Int

java.lang.Object

org.jcsp.plugNplay.ints.Merge2Int

All Implemented Interfaces:

CSProcess

public final class Merge2Int
extends java.lang.Object
implements CSProcess

Merges two strictly increasing int input streams into one strictly increasing output stream.

Process Diagram

    in0  ___________
   -->--|           | out
    in1 | Merge2Int |-->--
   -->--|___________|
 

Description

Merge2Int is a process whose output stream is the ordered merging of the integers on its input streams. It assumes that each input stream is strictly increasing (i.e. with no repeats) sequence of integers. It generates a strictly increasing output stream containing all -- and only -- the numbers from its input streams (eliminating any duplicates).

Channel Protocols

Input Channels
in0, in1	int	All channels in this package carry integers.
Output Channels
out	int	All channels in this package carry integers.

Example

The following example shows how to use Merge2Int in a small program. The program also uses some of the other plugNplay processes. The program prints, in ascending order (up to Integer.MAX_VALUE), all integers whose prime factors consist only of 2, 3 and 5. Curious readers may like to reason why the infinitely buffered channels are needed.

 import org.jcsp.lang.*;
 import org.jcsp.util.ints.*;
 import org.jcsp.plugNplay.ints.*;
 
 public class Merge2IntExample {
 
   public static void main (String[] argv) {
 
     final One2OneChannelInt[] a = Channel.one2oneIntArray (4);
     final One2OneChannelInt[] b = Channel.one2oneIntArray (3, new InfiniteBufferInt ());
     final One2OneChannelInt c = Channel.one2oneInt ();
     final One2OneChannelInt d = Channel.one2oneInt ();
     final One2OneChannelInt e = Channel.one2oneInt ();
 
     new Parallel (
       new CSProcess[] {
         new MultInt (2, a[0].in (), b[0].out ()),
         new MultInt (3, a[1].in (), b[1].out ()),
         new MultInt (5, a[2].in (), b[2].out ()),
         new Merge2Int (b[0].in (), b[1].in (), c.out ()),
         new Merge2Int (c.in (), b[2].in (), d.out ()),
         new PrefixInt (1, d.in (), e.out ()),
         new DeltaInt (e.in (), Channel.getOutputArray (a)),
         new PrinterInt (a[3].in (), "--> ", "\n")
       }
     ).run ();
 
   }
 
 }
 

Author:

P.H. Welch

See Also:

MergeInt

Constructor Summary

Constructors

Constructor and Description
Merge2Int(ChannelInputInt in0, ChannelInputInt in1, ChannelOutputInt out) Construct a new Merge2Int process with the input channels in0 and in1 and the output channel out.

Method Summary

Modifier and Type	Method and Description
void	run() The main body of this process.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Merge2Int

public Merge2Int(ChannelInputInt in0,
                 ChannelInputInt in1,
                 ChannelOutputInt out)

Construct a new Merge2Int process with the input channels in0 and in1 and the output channel out. The ordering of the input channels makes no difference to the behaviour of this process.

Parameters:

in0 - an input channel

in1 - an input channel

out - the output channel

Method Detail

run

public void run()

The main body of this process.

Specified by:

run in interface CSProcess