patterns/trash/ParseTrash.java · ThisYoung/OnJava8-Examples

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OnJava8-Examples

patterns

trash

ParseTrash.java

ParseTrash.java 2.97 KB

// patterns/trash/ParseTrash.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Open a file and parse its contents into
// Trash objects, placing each into a List
// {java patterns.trash.ParseTrash}
package patterns.trash;
import java.util.*;
import java.util.stream.*;
import java.io.*;
import java.nio.file.*;
import java.nio.file.Files;

public class ParseTrash {
 public static <T extends Trash> void
 fillBin(String pckg, Fillable<T> bin) {
 try {
 Files.lines(Paths.get("trash", "Trash.dat"))
 // Remove empty lines and comment lines:
 .filter(line -> line.trim().length() != 0)
 .filter(line -> !line.startsWith("//"))
 .forEach( line -> {
 String type = "patterns." + pckg + "." +
 line.substring(
 0, line.indexOf(':')).trim();
 double weight = Double.valueOf(
 line.substring(line.indexOf(':') + 1)
 .trim());
 bin.addTrash(Trash.factory(
 new Trash.Info(type, weight)));
 });
 } catch(IOException |
 NumberFormatException |
 Trash.TrashClassNotFoundException |
 Trash.CannotCreateTrashException e) {
 throw new RuntimeException(e);
 }
 }
 // Special case to handle List:
 public static <T extends Trash> void
 fillBin(String pckg, List<T> bin) {
 fillBin(pckg, new FillableList<>(bin));
 }
 // Basic test:
 public static void main(String[] args) {
 List<Trash> t = new ArrayList<>();
 fillBin("trash", t);
 t.forEach(System.out::println);
 }
}
/* Output:
Loading patterns.trash.Glass
Loading patterns.trash.Paper
Loading patterns.trash.Aluminum
Loading patterns.trash.Cardboard
patterns.trash.Glass w:54.0 v:0.23
patterns.trash.Paper w:22.0 v:0.10
patterns.trash.Paper w:11.0 v:0.10
patterns.trash.Glass w:17.0 v:0.23
patterns.trash.Aluminum w:89.0 v:1.67
patterns.trash.Paper w:88.0 v:0.10
patterns.trash.Aluminum w:76.0 v:1.67
patterns.trash.Cardboard w:96.0 v:0.23
patterns.trash.Aluminum w:25.0 v:1.67
patterns.trash.Aluminum w:34.0 v:1.67
patterns.trash.Glass w:11.0 v:0.23
patterns.trash.Glass w:68.0 v:0.23
patterns.trash.Glass w:43.0 v:0.23
patterns.trash.Aluminum w:27.0 v:1.67
patterns.trash.Cardboard w:44.0 v:0.23
patterns.trash.Aluminum w:18.0 v:1.67
patterns.trash.Paper w:91.0 v:0.10
patterns.trash.Glass w:63.0 v:0.23
patterns.trash.Glass w:50.0 v:0.23
patterns.trash.Glass w:80.0 v:0.23
patterns.trash.Aluminum w:81.0 v:1.67
patterns.trash.Cardboard w:12.0 v:0.23
patterns.trash.Glass w:12.0 v:0.23
patterns.trash.Glass w:54.0 v:0.23
patterns.trash.Aluminum w:36.0 v:1.67
patterns.trash.Aluminum w:93.0 v:1.67
patterns.trash.Glass w:93.0 v:0.23
patterns.trash.Paper w:80.0 v:0.10
patterns.trash.Glass w:36.0 v:0.23
patterns.trash.Glass w:12.0 v:0.23
patterns.trash.Glass w:60.0 v:0.23
patterns.trash.Paper w:66.0 v:0.10
patterns.trash.Aluminum w:36.0 v:1.67
patterns.trash.Cardboard w:22.0 v:0.23
*/

一键复制编辑原始数据按行查看历史

Bruce Eckel 提交于 2016年12月31日 09:23 +08:00 . Date change

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// patterns/trash/ParseTrash.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Open a file and parse its contents into
// Trash objects, placing each into a List
// {java patterns.trash.ParseTrash}
package patterns.trash;
import java.util.*;
import java.util.stream.*;
import java.io.*;
import java.nio.file.*;
import java.nio.file.Files;

public class ParseTrash {
 public static <T extends Trash> void
 fillBin(String pckg, Fillable<T> bin) {
 try {
 Files.lines(Paths.get("trash", "Trash.dat"))
 // Remove empty lines and comment lines:
 .filter(line -> line.trim().length() != 0)
 .filter(line -> !line.startsWith("//"))
 .forEach( line -> {
 String type = "patterns." + pckg + "." +
 line.substring(
 0, line.indexOf(':')).trim();
 double weight = Double.valueOf(
 line.substring(line.indexOf(':') + 1)
 .trim());
 bin.addTrash(Trash.factory(
 new Trash.Info(type, weight)));
 });
 } catch(IOException |
 NumberFormatException |
 Trash.TrashClassNotFoundException |
 Trash.CannotCreateTrashException e) {
 throw new RuntimeException(e);
 }
 }
 // Special case to handle List:
 public static <T extends Trash> void
 fillBin(String pckg, List<T> bin) {
 fillBin(pckg, new FillableList<>(bin));
 }
 // Basic test:
 public static void main(String[] args) {
 List<Trash> t = new ArrayList<>();
 fillBin("trash", t);
 t.forEach(System.out::println);
 }
}
/* Output:
Loading patterns.trash.Glass
Loading patterns.trash.Paper
Loading patterns.trash.Aluminum
Loading patterns.trash.Cardboard
patterns.trash.Glass w:54.0 v:0.23
patterns.trash.Paper w:22.0 v:0.10
patterns.trash.Paper w:11.0 v:0.10
patterns.trash.Glass w:17.0 v:0.23
patterns.trash.Aluminum w:89.0 v:1.67
patterns.trash.Paper w:88.0 v:0.10
patterns.trash.Aluminum w:76.0 v:1.67
patterns.trash.Cardboard w:96.0 v:0.23
patterns.trash.Aluminum w:25.0 v:1.67
patterns.trash.Aluminum w:34.0 v:1.67
patterns.trash.Glass w:11.0 v:0.23
patterns.trash.Glass w:68.0 v:0.23
patterns.trash.Glass w:43.0 v:0.23
patterns.trash.Aluminum w:27.0 v:1.67
patterns.trash.Cardboard w:44.0 v:0.23
patterns.trash.Aluminum w:18.0 v:1.67
patterns.trash.Paper w:91.0 v:0.10
patterns.trash.Glass w:63.0 v:0.23
patterns.trash.Glass w:50.0 v:0.23
patterns.trash.Glass w:80.0 v:0.23
patterns.trash.Aluminum w:81.0 v:1.67
patterns.trash.Cardboard w:12.0 v:0.23
patterns.trash.Glass w:12.0 v:0.23
patterns.trash.Glass w:54.0 v:0.23
patterns.trash.Aluminum w:36.0 v:1.67
patterns.trash.Aluminum w:93.0 v:1.67
patterns.trash.Glass w:93.0 v:0.23
patterns.trash.Paper w:80.0 v:0.10
patterns.trash.Glass w:36.0 v:0.23
patterns.trash.Glass w:12.0 v:0.23
patterns.trash.Glass w:60.0 v:0.23
patterns.trash.Paper w:66.0 v:0.10
patterns.trash.Aluminum w:36.0 v:1.67
patterns.trash.Cardboard w:22.0 v:0.23
*/