128 lines
3.4 KiB
Java
128 lines
3.4 KiB
Java
// patterns/trashvisitor/TrashVisitor.java
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// (c)2016 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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// {java patterns.trashvisitor.TrashVisitor}
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package patterns.trashvisitor;
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import patterns.trash.*;
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import java.util.*;
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// Specific group of algorithms packaged
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// in each implementation of Visitor:
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class PriceVisitor implements Visitor {
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private double alSum; // Aluminum
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private double pSum; // Paper
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private double gSum; // Glass
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private double cSum; // Cardboard
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public static void show(String s) {
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System.out.println(s);
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}
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@Override
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public void visit(Aluminum al) {
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double v = al.weight() * al.value();
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show("value of Aluminum= " + v);
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alSum += v;
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}
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@Override
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public void visit(Paper p) {
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double v = p.weight() * p.value();
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show("value of Paper= " + v);
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pSum += v;
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}
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@Override
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public void visit(Glass g) {
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double v = g.weight() * g.value();
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show("value of Glass= " + v);
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gSum += v;
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}
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@Override
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public void visit(Cardboard c) {
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double v = c.weight() * c.value();
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show("value of Cardboard = " + v);
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cSum += v;
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}
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@Override
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public void total() {
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show(
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"Total Aluminum: $" + alSum + "\n" +
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"Total Paper: $" + pSum + "\n" +
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"Total Glass: $" + gSum + "\n" +
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"Total Cardboard: $" + cSum);
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}
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}
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class WeightVisitor implements Visitor {
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private double alSum; // Aluminum
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private double pSum; // Paper
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private double gSum; // Glass
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private double cSum; // Cardboard
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public static void show(String s) {
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System.out.println(s);
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}
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@Override
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public void visit(Aluminum al) {
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alSum += al.weight();
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show("Aluminum weight = " + al.weight());
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}
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@Override
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public void visit(Paper p) {
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pSum += p.weight();
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show("Paper weight = " + p.weight());
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}
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@Override
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public void visit(Glass g) {
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gSum += g.weight();
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show("Glass weight = " + g.weight());
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}
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@Override
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public void visit(Cardboard c) {
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cSum += c.weight();
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show("Cardboard weight = " + c.weight());
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}
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@Override
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public void total() {
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show("Total weight Aluminum:" + alSum);
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show("Total weight Paper:" + pSum);
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show("Total weight Glass:" + gSum);
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show("Total weight Cardboard:" + cSum);
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}
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}
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public class TrashVisitor {
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public static void main(String[] args) {
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List<Trash> bin = new ArrayList<>();
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// ParseTrash still works, without changes:
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ParseTrash.fillBin("trashvisitor", bin);
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List<Visitor> visitors = Arrays.asList(
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new PriceVisitor(), new WeightVisitor());
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bin.forEach( t -> {
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Visitable v = (Visitable) t;
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visitors.forEach(visitor -> v.accept(visitor));
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});
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visitors.forEach(Visitor::total);
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}
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}
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/* Output: (First and Last 10 Lines)
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Loading patterns.trashvisitor.Glass
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Loading patterns.trashvisitor.Paper
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Loading patterns.trashvisitor.Aluminum
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Loading patterns.trashvisitor.Cardboard
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value of Glass= 12.420000225305557
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Glass weight = 54.0
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value of Paper= 2.2000000327825546
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Paper weight = 22.0
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value of Paper= 1.1000000163912773
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Paper weight = 11.0
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...________...________...________...________...
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value of Cardboard = 5.060000091791153
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Cardboard weight = 22.0
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Total Aluminum: $860.0499778985977
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Total Paper: $35.80000053346157
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Total Glass: $150.1900027245283
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Total Cardboard: $40.02000072598457
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Total weight Aluminum:515.0
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Total weight Paper:358.0
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Total weight Glass:653.0
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Total weight Cardboard:174.0
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*/
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