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65 lines
2.0 KiB
65 lines
2.0 KiB
/*
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* SD2x Homework #8
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* This class represents the Data Tier in the three-tier architecture.
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* Implement the appropriate methods for this tier below.
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*/
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.nio.charset.Charset;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.nio.file.Files;
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import java.util.Set;
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import java.util.HashSet;
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public class DataTier {
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private String fileName; // the name of the file to read
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public DataTier(String inputSource) {
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fileName = inputSource;
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}
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private boolean isSanitized(String str){
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if(str == null) return false;
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if(str.isEmpty()) return false;
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char start = str.charAt(0);
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char end = str.charAt(str.length() - 1);
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return end != '"' && end != '#' && start != '"';
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}
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private String sanitize(String str){
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if(str.isEmpty()) return "";
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String sanitized = str;
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char start = str.charAt(0);
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char end = str.charAt(str.length() - 1);
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if(start == '"') sanitized = str.substring(1,str.length());
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if(end == '#' || end == '"') sanitized = str.substring(0,str.length() - 1);
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if(!isSanitized(sanitized)) sanitized = sanitize(sanitized);
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return sanitized;
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}
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private Book parseBook(String line){
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String[] items = line.split("\t");
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return new Book(sanitize(items[0]), sanitize(items[1]), Integer.valueOf(items[2]));
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}
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public Set<Book> getAllBooks(){
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Path file = Paths.get(fileName);
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Set<Book> books = new HashSet<Book>();
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Charset charset = Charset.forName("US-ASCII");
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try (BufferedReader reader = Files.newBufferedReader(file, charset)) {
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String line = null;
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while ((line = reader.readLine()) != null) {
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if(line.isEmpty()) continue;
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books.add(parseBook(line));
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}
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} catch (IOException x) {
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System.err.format("IOException: %s%n", x);
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}
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return books;
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}
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}
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