69 lines
2.2 KiB
Java
69 lines
2.2 KiB
Java
// patterns/trash/ParseTrash.java
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// (c)2021 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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// Opens a file and parses its contents into
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// Trash objects, placing each into a Fillable.
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// {java patterns.trash.ParseTrash}
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package patterns.trash;
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import java.util.*;
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import java.util.stream.*;
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import java.io.*;
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import java.nio.file.*;
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import java.nio.file.Files;
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public class ParseTrash {
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public static String source = "Trash.dat";
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public static <T extends Trash> void
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fillBin(String packageName, Fillable<T> bin) {
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DynaFactory factory =
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new DynaFactory(packageName);
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try {
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Files.lines(Paths.get("trash", source))
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// Remove comments and empty lines:
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.filter(line -> line.trim().length() != 0)
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.filter(line -> !line.startsWith("//"))
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.forEach(line -> {
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String type = line.substring(
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0, line.indexOf(':')).trim();
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double weight = Double.valueOf(
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line.substring(line.indexOf(':') + 1)
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.trim());
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bin.addTrash(factory.create(
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new TrashInfo(type, weight)));
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});
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} catch(IOException | NumberFormatException e) {
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throw new RuntimeException(e);
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}
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}
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// Special case to handle a List:
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public static <T extends Trash> void
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fillBin(String packageName, List<T> bin) {
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fillBin(packageName, new FillableList<>(bin));
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}
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// Basic test:
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public static void main(String[] args) {
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List<Trash> bin = new ArrayList<>();
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fillBin("trash", bin);
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bin.forEach(System.out::println);
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}
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}
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/* Output:
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Loading patterns.trash.Cardboard
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Loading patterns.trash.Paper
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Loading patterns.trash.Aluminum
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Loading patterns.trash.Glass
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Cardboard weight: 4.40 * price: 0.11 = 0.48
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Paper weight: 8.00 * price: 0.10 = 0.80
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Aluminum weight: 1.80 * price: 1.67 = 3.01
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Glass weight: 5.40 * price: 0.23 = 1.24
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Aluminum weight: 3.40 * price: 1.67 = 5.68
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Cardboard weight: 2.20 * price: 0.11 = 0.24
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Glass weight: 4.30 * price: 0.23 = 0.99
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Cardboard weight: 1.20 * price: 0.11 = 0.13
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Paper weight: 6.60 * price: 0.10 = 0.66
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Aluminum weight: 2.70 * price: 1.67 = 4.51
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Paper weight: 9.10 * price: 0.10 = 0.91
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Glass weight: 3.60 * price: 0.23 = 0.83
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*/
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