Aleksandr – 26. märts 2015, kell 07:27

2015-03-26T07:27:28Z

Aleksandr: Uus lehekülg: 'Общая информация об упражнениях: ITI0011RUS_Practice.
Обратно на страницу предмета. ITI0011RUS_Practice.<br/> Обратно на страницу предмета. <source lang="ja...'

Uus lehekülg
Общая информация об упражнениях: [[ITI0011RUS_Practice]].<br/>
Обратно на [[ITI0011RUS|страницу предмета]].

<source lang="java">
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.ArrayList;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

import cs.ttu.ee.BookShopApi;
import cs.ttu.ee.BookShopApiException;
import cs.ttu.ee.SimpleBookShop;

/**
* BookShop class.
* Simplified implementation of BookShop
* Does filtering and basic queries.
*/
public class BookShop extends SimpleBookShop {

/**
* Instance of BookShopApi, used to access
* Google Books
*/
private BookShopApi bookShopApi;

/**
* Last api query result.
*/
private String lastResponse = "";

public BookShop(BookShopApi _bookShopApi) {
bookShopApi = _bookShopApi;
}

/**
* Make api query.
* Uses BookStoreApi functionality to get XML response from Google Books
* Every time this function is called, latest XML state is saved.
* If previous query failed lastResponse equals to empty string.
* Otherwise lastResult is
* @param search title of book
*/
public void query(String searchString) {
try {
lastResponse = bookShopApi.getBookByTitle(searchString);
} catch (BookShopApiException e) {
lastResponse = "";
}
}

private NodeList getXPathData(String xPathStr) {
if(lastResponse.isEmpty()) {
return null;
}
try {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = dbf.newDocumentBuilder();
Document xmlDocument = builder.parse(
new ByteArrayInputStream(lastResponse.getBytes()));
XPathFactory xpf = XPathFactory.newInstance();
XPath xPath = xpf.newXPath();
XPathExpression expr = xPath.compile(xPathStr);
return (NodeList) expr.evaluate(xmlDocument, XPathConstants.NODESET);
} catch (
ParserConfigurationException |
SAXException |
IOException |
XPathExpressionException e) {
return null;
}

}

/**
* Find total items matched by searchString.
* Api uses paging, not all results are
* displayed under result, however, total
* results is displayed inside <totalItems> element
*
* If last query was unsuccessful, 0 is returned.
*
* @return Total items matched by query.
*/
public int getTotalRecordsInResponse() {

NodeList records = getXPathData("/result/totalItems");

for(int i=0; i<records.getLength(); ++i) {
Node node = records.item(i);
String v = node.getTextContent();
return Integer.parseInt(v);
}

return 0;
}

/**
* Finds all possbile book titles.
* Duplicates may occur.
*
* Title can be found inside <title> tag.
* If last query was unsuccessful, empty ArrayList is returned.
*
* @return All possible book names matched by searchString
*/
public ArrayList<String> getPossibleBookTitles() {

ArrayList<String> bookTitles = new ArrayList<String>();

NodeList records = getXPathData("//title");

for(int i=0; i<records.getLength(); ++i) {
Node title = records.item(i);
bookTitles.add(title.getTextContent());
}

return bookTitles;
}

/**
* Finds all authors found in last response.
* Does not include duplicate authors.
* If last query was unsuccessful, empty ArrayList is returned.
*
* Author can be found inside <authors> element. (Notice non plural form)
* NB! Multiple <authors> element may occur.
*
* @return List of authors found in last response
*/
public ArrayList<String> getPossibleAuthors() {
// TODO: implement
return null;
}

/**
* Finds book with the most number of pages
*
* Page count can be found inside <pageCount> element
* @return Title of book.
*/
public String getBookWithMostPagesTitle() {
// TODO: implement
return null;
}

/**
* Finds all book titles where pageCount < n
*
* Page count can be found inside <pageCount> element
* @param n maximum amount of pages
* @return list of books with less than n pages
*/
public ArrayList<String> getBookWithLessThanNPagesTitles(int n) {
// TODO: implement
return null;
}

}
</source>

←Vanem redaktsioon		Redaktsioon: 26. märts 2015, kell 07:27
1. rida:		1. rida:
−	~~Общая информация об упражнениях: [[ITI0011RUS_Practice]].<br/>~~
	Обратно на [[ITI0011RUS\|страницу предмета]].		Обратно на [[ITI0011RUS\|страницу предмета]].