92 lines
3.0 KiB
Java
92 lines
3.0 KiB
Java
// patterns/trash/ParseTrash.java
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// (c)2020 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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// Open a file and parse its contents into
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// Trash objects, placing each into a List
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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 <T extends Trash> void
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fillBin(String pckg, Fillable<T> bin) {
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try {
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Files.lines(Paths.get("trash", "Trash.dat"))
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// Remove empty lines and comment 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 = "patterns." + pckg + "." +
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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(Trash.factory(
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new Trash.Info(type, weight)));
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});
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} catch(IOException |
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NumberFormatException |
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Trash.TrashClassNotFoundException |
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Trash.CannotCreateTrashException 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 List:
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public static <T extends Trash> void
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fillBin(String pckg, List<T> bin) {
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fillBin(pckg, 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> t = new ArrayList<>();
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fillBin("trash", t);
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t.forEach(System.out::println);
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}
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}
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/* Output:
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Loading patterns.trash.Glass
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Loading patterns.trash.Paper
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Loading patterns.trash.Aluminum
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Loading patterns.trash.Cardboard
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patterns.trash.Glass w:54.0 v:0.23
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patterns.trash.Paper w:22.0 v:0.10
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patterns.trash.Paper w:11.0 v:0.10
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patterns.trash.Glass w:17.0 v:0.23
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patterns.trash.Aluminum w:89.0 v:1.67
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patterns.trash.Paper w:88.0 v:0.10
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patterns.trash.Aluminum w:76.0 v:1.67
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patterns.trash.Cardboard w:96.0 v:0.23
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patterns.trash.Aluminum w:25.0 v:1.67
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patterns.trash.Aluminum w:34.0 v:1.67
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patterns.trash.Glass w:11.0 v:0.23
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patterns.trash.Glass w:68.0 v:0.23
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patterns.trash.Glass w:43.0 v:0.23
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patterns.trash.Aluminum w:27.0 v:1.67
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patterns.trash.Cardboard w:44.0 v:0.23
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patterns.trash.Aluminum w:18.0 v:1.67
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patterns.trash.Paper w:91.0 v:0.10
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patterns.trash.Glass w:63.0 v:0.23
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patterns.trash.Glass w:50.0 v:0.23
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patterns.trash.Glass w:80.0 v:0.23
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patterns.trash.Aluminum w:81.0 v:1.67
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patterns.trash.Cardboard w:12.0 v:0.23
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patterns.trash.Glass w:12.0 v:0.23
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patterns.trash.Glass w:54.0 v:0.23
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patterns.trash.Aluminum w:36.0 v:1.67
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patterns.trash.Aluminum w:93.0 v:1.67
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patterns.trash.Glass w:93.0 v:0.23
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patterns.trash.Paper w:80.0 v:0.10
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patterns.trash.Glass w:36.0 v:0.23
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patterns.trash.Glass w:12.0 v:0.23
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patterns.trash.Glass w:60.0 v:0.23
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patterns.trash.Paper w:66.0 v:0.10
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patterns.trash.Aluminum w:36.0 v:1.67
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patterns.trash.Cardboard w:22.0 v:0.23
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*/
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