L.A.E. demo

Tool-ul la care lucrăm deocamdată (nume de cod L.A.E.)

Property value reader example / Java

# Settings for starting Matlab in stay-alive mode
matlab_path=C:/Users/Me/Desktop/backend
matlab_exe_filename=lev_lis_interface_main.exe
matlab_exe_params=standard log.txt logs

-------------

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/** * Created by Me on 8/22/2017. */public class MatlabPropertyValues {

    private static final Logger LOGGER = LoggerFactory.getLogger(MatlabPropertyValues.class);

    private String executablePath;
    private String executableName;
    private String executableParams;

    InputStream inputStream = null;

    private static MatlabPropertyValues instance = null;

    public static MatlabPropertyValues getInstance() {
        if (instance == null) {
            instance = new MatlabPropertyValues();
            instance.loadPropValues();
        }
        return instance;
    }

    private void loadPropValues() {
        try {
            Properties prop = new Properties();
            String propFileName = "config.properties";

            inputStream = getClass().getClassLoader().getResourceAsStream(propFileName);  // may be different

            if (inputStream != null) {
                prop.load(inputStream);
            } else {
                throw new FileNotFoundException("Property file '" + propFileName + "' not found in the classpath");
            }

            executablePath = prop.getProperty("matlab_path");
            executableName = prop.getProperty("matlab_exe_filename");
            executableParams = prop.getProperty("matlab_exe_params");

        } catch (Exception e) {
            e.printStackTrace();
            LOGGER.error(e.getMessage());
        } finally {
            try {
                inputStream.close();
            }
            catch (IOException e) {
                e.printStackTrace();
                LOGGER.error(e.getMessage());
            }
        }
    }

    public String getExecutablePath() {
        return executablePath;
    }

    public String getExecutableName() {
        return executableName;
    }

    public String getExecutableParams() {
        return executableParams;
    }

    public static List<String> getPropertyValuesAsList() {
        List<String> args = new ArrayList<>();
        MatlabPropertyValues instance = getInstance();
        args.add(instance.getExecutablePath());
        args.add(instance.getExecutablePath() + "\\" + instance.getExecutableName());
        String params [] = instance.getExecutableParams().split(" ");
        args.add(params[0] + " " + (instance.getExecutablePath() + "\\" + params[1]) + " " +
                (instance.getExecutablePath() + "\\" + params[2]));
        return args;
    }
}

Generate classes for XML Schema (xjc)

Fie o schema (model.xsd):

<?xml version="1.0"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:complexType name="StudentType"> <xs:sequence> <xs:element name="firstname" type="xs:string"/> <xs:element name="lastname" type="xs:string"/> <xs:element name="nickname" type="xs:string"/> <xs:element name="marks" type="xs:integer"/> </xs:sequence> <xs:attribute name="rollno" type="xs:integer"/> </xs:complexType> <xs:complexType name="SpecialtyType"> <xs:sequence> <xs:element name="phd" type="xs:string"/> <xs:element name="year" type="YearType"/> </xs:sequence> <xs:attribute name="rollno" type="xs:integer"/> </xs:complexType> <xs:complexType name="YearType"> <xs:simpleContent> <xs:extension base="xs:integer"> <xs:attribute name="obtained" type="xs:string"/> </xs:extension> </xs:simpleContent> </xs:complexType> <xs:complexType name="ProfType"> <xs:sequence> <xs:element name="name" type="xs:string"/> <xs:element name="specialty" type="SpecialtyType"/> </xs:sequence> </xs:complexType> <xs:complexType name="ClassType"> <xs:sequence> <xs:element name="student" type="StudentType" maxOccurs="unbounded"/> <xs:element name="professor" type="ProfType" maxOccurs="unbounded"/> </xs:sequence> </xs:complexType> <xs:element name="class" type="ClassType"/> </xs:schema>

Si o implementare (input.xml):

<?xml version="1.0"?> <?xml version="1.0" encoding="UTF-8" ?> <class> <student rollno="393"> <firstname>dinkar</firstname> <lastname>kad</lastname> <nickname>dinkar</nickname> <marks>85</marks> </student> <student rollno="493"> <firstname>Vaneet</firstname> <lastname>Gupta</lastname> <nickname>vinni</nickname> <marks>95</marks> </student> <student rollno="593"> <firstname>jasvir</firstname> <lastname>singn</lastname> <nickname>jazz</nickname> <marks>90</marks> </student> <professor> <name>cheng</name> <specialty> <phd>biology</phd> <year obtained="no">2017</year> </specialty> </professor> <professor> <name>feng</name> <specialty> <phd>physics</phd> <year obtained="yes">2010</year> </specialty> </professor> </class>

Metoda (1)

In Maven (pom.xml)

<?xml version="1.0"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelversion>4.0.0</modelVersion> <groupid>com.parsing</groupId> <artifactid>ParserTest</artifactId> <packaging>jar</packaging> <version>1.0-SNAPSHOT</version> <name>ParserTest</name> <url>http://maven.apache.org</url> <build> <plugins> <plugin> <groupid>org.codehaus.mojo</groupId> <artifactid>jaxb2-maven-plugin</artifactId> <version>2.3</version> <executions> <execution> <id>xjc</id> <goals> <goal>xjc</goal> </goals> </execution> </executions> <configuration> <sources> <source>/src/main/resources/model.xsd</source> </sources> </configuration> </plugin> </plugins> </build> <dependencies> <dependency> <groupid>junit</groupId> <artifactid>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> </dependencies> </project>

(mvn clean install) => target/generatedSources/jaxb/generated/


Metoda (2)

Cu xjc din suita jdk-ului:

> xjc -d <path-to-folder-to-add> -p <package-name> model.xsd

Comanda creeaza un proiect nou avand fisierele sursa generate din schema.


Utilizare pentru parsarea lui input.xml:

File file = new File(MyDOMParser.FILENAME); try { JAXBContext jaxbContext = JAXBContext.newInstance(ObjectFactory.class); ClassType classType = ((JAXBElement<classtype>) jaxbContext.createUnmarshaller().unmarshal(file)).getValue(); for (StudentType student : classType.getStudent()) { System.out.println("Student; rollNo=" + student.getRollno() + "\n\t" + "Name: " + student.getFirstname() + " " + student.getLastname() + " (" + student.getNickname() + ")\n\t" + "Marks: " + student.getMarks()); } for (ProfType prof : classType.getProfessor()) { System.out.println("Prof\n\t" + "Name: " + prof.getName() + "\n\t" + "Specialty: \n\t\tphd=" + prof.getSpecialty().getPhd() + "\n\t\tYear=" + prof.getSpecialty().getYear().getValue() + " (obtained " + prof.getSpecialty().getYear().getObtained() + ")"); } } catch (Exception e) { e.printStackTrace(); }

Code jam, for women (solutiile mele, #2)

Which two dancers will be next to dancer number K when the dance is over?

# init
T = 0
i = 1

def solve(caseId, D, K, N):
pos = [0 for i in range(D)]
i = 1
while i<= D:
    # even -> ccw
if i % 2 == 0:
pos[(i - N) % D] = i
# odd -> cw
else:
pos[(i + N) % D] = i

    i += 1
  posK = pos.index(K)
msg = "Case #"+ str(caseId) + ": " + str(pos[(posK+1)%D]) + " " + str(pos[(posK-1)%D])
print msg


with open("B-large-practice.in", "r") as myFile:
        T = eval(myFile.readline())
        for line in myFile:
                D, K, N = line.split(' ')
                solve (i, eval(D), eval(K), eval(N))
                i = i + 1

myFile.close()

# This solution does not scale !!!

# if D is very large, we can't afford to use an array that large!
# hence got this math solution below:

case = 1

def fix(number, D):
  while number <= 0:
    number += D
  while number > D:
    number -= D
  return number

def getLeft(index_K, D, N):
  if index_K == D-1:
    index_left = 0
  else:
    index_left = index_K + 1

  j = 0 # does not matter as we add/subtract as we want
  left = D*j + index_left + N
  if left % 2 == 0:
    return fix(left,D)
    
  left = D*j + index_left - N
  if left % 2 == 1:
    return fix(left,D)
  return -1  


def getRight(index_K, D, N):
  if index_K == 0:
    index_right = D-1
  else:
    index_right = index_K - 1
  
  j = 0
  right = D*j + index_right + N
  if right % 2 == 0:
    return fix(right,D)
    
  right = D*j + index_right - N
  if right % 2 == 1:
    return fix(right,D)
  return -1


def solve(caseId, D, K, N):
  if K % 2 == 0:
    index_K = (K - N) % D # K is at position (K-N)%D
    left = getLeft (index_K, D, N)
    right = getRight (index_K, D, N)
  else:
    index_K = (K + N) % D
    left = getLeft (index_K, D, N)
    right = getRight (index_K, D, N)
  
  msg = "Case #"+ str(caseId) + ": " + str(left) + " " + str(right)
  print msg


with open("B-large-practice.in", "r") as myFile:
        T = eval(myFile.readline())
        for line in myFile:
                D, K, N = line.split(' ')
                solve (case, eval(D), eval(K), eval(N))
                case = case + 1


myFile.close()

Java8 (Streams, filtering) & Unit testing - exemplu dragut

package ch.makery.address;

import ch.makery.address.model.Person;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

import java.util.*;

/** * Created by Geo on 3/3/2017. */
@RunWith(value = Parameterized.class)
public class StreamTest {

    public Map<String, List<Person>> people;

    @Before    

    public void init () {
        people = new HashMap<>();
        people.put("Bucharest", new ArrayList<Person>());
        people.put("Pitesti", new ArrayList<Person>());
        people.put("Timisoara", new ArrayList<Person>());
        people.put("Iasi", new ArrayList<Person>());
        people.put("Cluj", new ArrayList<Person>());

        people.get("Bucharest").add(new Person("Geo", "T", "Bucharest", 51081, 1969, 2, 21));
        people.get("Bucharest").add(new Person("Kate", "M", "Bucharest", 97124, 1999, 2, 21));
        people.get("Bucharest").add(new Person("Alex", "W", "Bucharest", 51081, 1999, 2, 21));
        people.get("Bucharest").add(new Person("Ana", "T", "Bucharest", 51081, 2009, 2, 21));

        people.get("Pitesti").add(new Person("Lena", "A", "Pitesti", 70503, 2009, 2, 21));
        people.get("Timisoara").add(new Person("Catalin", "F", "Timisoara", 51081, 2000, 2, 21));
        people.get("Iasi").add(new Person("Petri", "T", "Iasi", 51081, 1976, 2, 21));
        people.get("Cluj").add(new Person("Sahar", "A", "Cluj", 97124, 1977, 2, 21));
    }

    @Parameterized.Parameter(value=0)
    public int age;

    @Parameterized.Parameter(value=1)
    public String city;

    @Parameterized.Parameter(value=2)
    public List<Integer> postalCodes;

    @Parameterized.Parameter(value=3)
    public String expected;

    @Parameterized.Parameters(name = "{index}: testFilterPersons({0},{1},{2}) => {3}")
    public static Collection<Object[]> data() {
        return Arrays.asList(new Object[][]{
                {18, "Bucharest", Arrays.asList(51081), "Geo T\nAlex W\n"},
                {18, "Cluj", Arrays.asList(51081, 97124), "Sahar A\n"}
        });
    }

    @Test    

    public void testFilterPersons() {
        assert(filterPersons(age,city,postalCodes).equals(expected));
    }


    private String filterPersons(int age, String city, List<Integer> postalCodes) { // why void?        

        return (people.get(city)).stream()

           .filter( person -> postalCodes.contains(person.getPostalCode()) && person.getAge() >= age)
           .map ( person -> person.getFirstName() + " " + person.getLastName())
           .reduce ("", (a,b) -> a+b+"\n");
    }

}