carfield.com.hk

FillableVisitor.java

2001-12-26T16:00:00Z

TrashVisitor.java

2001-12-26T16:00:00Z

//: c12:trashvisitor:TrashVisitor.java 
// The "visitor" pattern with VisitableDecorators.
import c12.trash.*;
import java.util.*;
import com.bruceeckel.test.*;

// Specific group of algorithms packaged
// in each implementation of Visitor:
class PriceVisitor implements Visitor {
  private double alSum; // Aluminum
  private double pSum; // Paper
  private double gSum; // Glass
  private double cSum; // Cardboard
  public void visit(Aluminum al) {
    double v = al.getWeight() * al.getValue();
    System.out.println(
      "value of Aluminum= " + v);
    alSum += v;
  }
  public void visit(Paper p) {
    double v = p.getWeight() * p.getValue();
    System.out.println(
      "value of Paper= " + v);
    pSum += v;
  }
  public void visit(Glass g) {
    double v = g.getWeight() * g.getValue();
    System.out.println(
      "value of Glass= " + v);
    gSum += v;
  }
  public void visit(Cardboard c) {
    double v = c.getWeight() * c.getValue();
    System.out.println(
      "value of Cardboard = " + v);
    cSum += v;
  }
  void total() {
    System.out.println(
      "Total Aluminum: $" + alSum +
      "\n Total Paper: $" + pSum + 
      "\nTotal Glass: $" + gSum + 
      "\nTotal Cardboard: $" + cSum +
      "\nTotal: $" + 
        (alSum + pSum + gSum + cSum));
  }
}

class WeightVisitor implements Visitor {
  private double alSum; // Aluminum
  private double pSum; // Paper
  private double gSum; // Glass
  private double cSum; // Cardboard
  public void visit(Aluminum al) {
    alSum += al.getWeight();
    System.out.println("weight of Aluminum = "
        + al.getWeight());
  }
  public void visit(Paper p) {
    pSum += p.getWeight();
    System.out.println("weight of Paper = "
        + p.getWeight());
  }
  public void visit(Glass g) {
    gSum += g.getWeight();
    System.out.println("weight of Glass = "
        + g.getWeight());
  }
  public void visit(Cardboard c) {
    cSum += c.getWeight();
    System.out.println("weight of Cardboard = "
        + c.getWeight());
  }
  void total() {
    System.out.println(
      "Total weight Aluminum: "  + alSum +
      "\nTotal weight Paper: " + pSum +
      "\nTotal weight Glass: " + gSum +
      "\nTotal weight Cardboard: " + cSum +
      "\nTotal weight: " + 
        (alSum + pSum + gSum + cSum));

  }
}

public class TrashVisitor extends UnitTest {
  Collection bin = new ArrayList();
  PriceVisitor pv = new PriceVisitor();
  WeightVisitor wv = new WeightVisitor();
  public TrashVisitor() {
    ParseTrash.fillBin("../trash/Trash.dat", 
      new FillableVisitor(
        new FillableCollection(bin)));
  }
  public void test() {
    Iterator it = bin.iterator();
    while(it.hasNext()) {
      Visitable v = (Visitable)it.next();
      v.accept(pv);
      v.accept(wv);
    }
    pv.total();
    wv.total();
  }
  public static void main(String args[]) {
    new TrashVisitor().test();
  }
} ///:~

VAluminum.java

2001-12-26T16:00:00Z

Visitable.java

2001-12-26T16:00:00Z

VisitableDecorator.java

2001-12-26T16:00:00Z

Visitor.java

2001-12-26T16:00:00Z

makefile

2001-12-26T16:00:00Z

# From Thinking in Patterns (with Java) by Bruce Eckel
# At http://www.BruceEckel.com
# (c)2001 Bruce Eckel 
# Copyright notice in Copyright.txt
# Automatically-generated MAKEFILE 
# For examples in directory .\c12\trashvisitor
# using the JDK 1.3 compiler
# Invoke with: make

HOME := ../../

ifndef MAKECMDGOALS
MAKECMDGOALS := javac
endif

# Command.com is too weak to build this under Windows NT/2000:
ifeq ($(OS),Windows_NT)
COMSPEC=$(SYSTEMROOT)\system32\cmd.exe
endif

ifneq ($(MAKECMDGOALS),clean)
include $(HOME)/$(MAKECMDGOALS).mac
endif

.SUFFIXES : .class .java
.java.class :
	$(JVC) $(JVCFLAGS) $<

javac: \
	Visitable.class \
	Visitor.class \
	VAluminum.class \
	VisitableDecorator.class \
	FillableVisitor.class \
	TrashVisitor.class

jikes: \
	Visitable.class \
	Visitor.class \
	VAluminum.class \
	VisitableDecorator.class \
	FillableVisitor.class \
	TrashVisitor.class

clean:
ifeq ($(notdir $(SHELL)),COMMAND.COM)
	del *.class
else
	rm -f *.class
endif


Visitable.class: Visitable.java 

Visitor.class: Visitor.java 

VAluminum.class: VAluminum.java 

VisitableDecorator.class: VisitableDecorator.java 

FillableVisitor.class: FillableVisitor.java 

TrashVisitor.class: TrashVisitor.java 
	$(JVC) $(JVCFLAGS) $<
	java com.bruceeckel.test.RunUnitTests TrashVisitor