Finished Lab

pom.xml

@@ -15,7 +15,7 @@
     </parent>
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <start-class>io.zipcoder.tc_spring_poll_application.QuickPollApplication</start-class>
+        <start-class>io.zipcoder.springdemo.QuickPollApplication</start-class>
         <java.version>1.7</java.version>
     </properties>
     <dependencies>

src/main/java/dtos/OptionCount.java

@@ -0,0 +1,22 @@
+package dtos;
+
+public class OptionCount {
+    private  Long optionId;
+    private int count;
+
+    public Long getOptionId() {
+        return optionId;
+    }
+
+    public void setOptionId(Long optionId) {
+        this.optionId = optionId;
+    }
+
+    public int getCount() {
+        return count;
+    }
+
+    public void setCount(int count) {
+        this.count = count;
+    }
+}

src/main/java/dtos/VoteResult.java

@@ -0,0 +1,24 @@
+package dtos;
+
+import java.util.Collection;
+
+public class VoteResult {
+    private int totalVotes;
+    private Collection<OptionCount> results;
+
+    public int getTotalVotes() {
+        return totalVotes;
+    }
+
+    public void setTotalVotes(int totalVotes) {
+        this.totalVotes = totalVotes;
+    }
+
+    public Collection<OptionCount> getResults() {
+        return results;
+    }
+
+    public void setResults(Collection<OptionCount> results) {
+        this.results = results;
+    }
+}

src/main/java/io/zipcoder/tc_spring_poll_application/controller/ComputeResultController.java

@@ -0,0 +1,51 @@
+package io.zipcoder.tc_spring_poll_application.controller;
+
+import dtos.OptionCount;
+import dtos.VoteResult;
+import io.zipcoder.tc_spring_poll_application.domain.Vote;
+import io.zipcoder.tc_spring_poll_application.repositories.VoteRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.HashMap;
+import java.util.Map;
+
+@RestController
+public class ComputeResultController {
+
+    private VoteRepository voteRepository;
+
+    @Autowired
+    public  ComputeResultController(VoteRepository voteRepository){
+        this.voteRepository = voteRepository;
+    }
+
+    @RequestMapping(value = "/computeresult", method = RequestMethod.GET)
+    public ResponseEntity<?> computeResult(@RequestParam Long pollId){ //requestparam annotation instructs SPring to retrieve the pollId value from a HTTP query
+        VoteResult voteResult = new VoteResult();
+        Iterable<Vote> allVotes = voteRepository.findVotesByPoll(pollId);
+
+        int totalVotes = 0;
+        Map<Long, OptionCount> tempMap = new HashMap<>();
+        for(Vote v : allVotes) {
+            totalVotes ++;
+            // Get the OptionCount corresponding to this Option
+            OptionCount optionCount = tempMap.get(v.getOption().getId());
+            if(optionCount == null) {
+                optionCount = new OptionCount();
+                optionCount.setOptionId(v.getOption().getId());
+                tempMap.put(v.getOption().getId(), optionCount);
+            }
+            optionCount.setCount(optionCount.getCount()+1);
+        }
+        voteResult.setTotalVotes(totalVotes);
+        voteResult.setResults(tempMap.values());
+
+        return new ResponseEntity<>(voteResult, HttpStatus.OK); //computes results sent to client using new response entity
+    }
+}

src/main/java/io/zipcoder/tc_spring_poll_application/controller/PollController.java

@@ -0,0 +1,79 @@
+package io.zipcoder.tc_spring_poll_application.controller;
+
+import io.zipcoder.tc_spring_poll_application.domain.Poll;
+import io.zipcoder.tc_spring_poll_application.exception.ResourceNotFoundException;
+import io.zipcoder.tc_spring_poll_application.repositories.PollRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.servlet.support.ServletUriComponentsBuilder;
+
+import javax.validation.Valid;
+import java.net.URI;
+
+@RestController// marks entity as a controller following REST specs
+public class PollController {
+
+    private PollRepository pollRepository;
+
+    @Autowired //The @Autowired annotation allows you to skip configurations elsewhere of what to inject and just does it for you
+    public PollController(PollRepository pollRepository){
+        this.pollRepository = pollRepository;
+    }
+
+    @RequestMapping(value="/polls", method= RequestMethod.GET)//maps web requests to entities with the @RequestMapping
+    public ResponseEntity<Page<Poll>> getAllPolls(Pageable pageable) {
+        Page<Poll> allPolls = pollRepository.findAll(pageable); //essentially pages the data
+        return new ResponseEntity<>(allPolls, HttpStatus.OK);// returns paged data
+    }
+
+    @RequestMapping(value="/polls", method=RequestMethod.POST)
+    public ResponseEntity<?> createPoll(@RequestBody Poll poll) { //@RequestBody tells Spring that the entire request body needs to be converted to an instance of Poll
+        poll = pollRepository.save(poll);
+        HttpHeaders newHeaders = new HttpHeaders();
+
+        URI newPollUri = ServletUriComponentsBuilder //allows the client to have a way to know the uri of the created poll
+                .fromCurrentRequest()
+                .path("/{id}")
+                .buildAndExpand(poll.getId())
+                .toUri();
+                newHeaders.setLocation(newPollUri);
+        return new ResponseEntity<>(newHeaders, HttpStatus.CREATED);
+    }
+
+    @Valid
+    @RequestMapping(value="/polls/{pollId}", method=RequestMethod.GET)
+    public ResponseEntity<?> getPoll(@PathVariable Long pollId) {
+        verifyPoll(pollId);
+        Poll p = pollRepository.findOne(pollId);
+        return new ResponseEntity<> (p, HttpStatus.OK);
+    }
+
+    @Valid
+    @RequestMapping(value="/polls/{pollId}", method=RequestMethod.PUT)
+    public ResponseEntity<?> updatePoll(@RequestBody Poll poll, @PathVariable Long pollId) {
+        // Save the entity
+        verifyPoll(pollId);
+        Poll p = pollRepository.save(poll);
+        return new ResponseEntity<>(HttpStatus.OK);
+    }
+
+    @RequestMapping(value="/polls/{pollId}", method=RequestMethod.DELETE)
+    public ResponseEntity<?> deletePoll(@PathVariable Long pollId) {
+        verifyPoll(pollId);
+        pollRepository.delete(pollId);
+        return new ResponseEntity<>(HttpStatus.OK);
+    }
+
+    public void verifyPoll(Long pollId){
+        Poll poll = pollRepository.findOne(pollId);
+        if(poll == null){
+            throw new ResourceNotFoundException("The given poll id " + pollId + " does not exist!");
+        }
+    }
+
+}

src/main/java/io/zipcoder/tc_spring_poll_application/controller/VoteController.java

@@ -0,0 +1,43 @@
+package io.zipcoder.tc_spring_poll_application.controller;
+
+import io.zipcoder.tc_spring_poll_application.domain.Vote;
+import io.zipcoder.tc_spring_poll_application.repositories.VoteRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.servlet.support.ServletUriComponentsBuilder;
+
+
+@RestController
+public class VoteController {
+
+    private VoteRepository voteRepository;
+
+    @Autowired
+    public VoteController(VoteRepository voteRepository) {
+        this.voteRepository = voteRepository;
+    }
+
+    @RequestMapping(value = "/polls/{pollId}/votes", method = RequestMethod.POST)
+    public ResponseEntity<?> createVote(@PathVariable Long pollId, @RequestBody Vote
+            vote) {
+        vote = voteRepository.save(vote);
+        // Set the headers for the newly created resource
+        HttpHeaders responseHeaders = new HttpHeaders();
+        responseHeaders.setLocation(ServletUriComponentsBuilder.
+                fromCurrentRequest().path("/{id}").buildAndExpand(vote.getId()).toUri());
+        return new ResponseEntity<>(null, responseHeaders, HttpStatus.CREATED);
+    }
+
+    @RequestMapping(value="/polls/votes", method=RequestMethod.GET)
+    public Iterable<Vote> getAllVotes() {
+        return voteRepository.findAll();
+    }
+
+    @RequestMapping(value="/polls/{pollId}/votes", method=RequestMethod.GET)
+    public Iterable<Vote> getVote(@PathVariable Long pollId) {
+        return voteRepository.findVotesByPoll(pollId);
+    }
+}

src/main/java/io/zipcoder/tc_spring_poll_application/domain/Option.java

@@ -0,0 +1,35 @@
+package io.zipcoder.tc_spring_poll_application.domain;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+
+@Entity // this means that a class can be mapped to a table. Just is a marker like Serializable
+public class Option {
+
+    @Id // specifies primary key of entity (primary key is a special column)
+    @GeneratedValue // configures the way of increment of the specified column (field)
+    @Column(name = "OPTION_ID")// specifies mapped column for a persistence property. Without this annotation the framework assumes the field's variable-name is the persistent property
+    private Long id;
+
+    @Column(name = "OPTION_VALUE")// specifies mapped column for persistence value
+    private String value;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getValue() {
+        return value;
+    }
+
+    public void setValue(String value) {
+        this.value = value;
+    }
+
+}

src/main/java/io/zipcoder/tc_spring_poll_application/domain/Poll.java

@@ -0,0 +1,50 @@
+package io.zipcoder.tc_spring_poll_application.domain;
+
+import org.hibernate.validator.constraints.NotEmpty;
+
+import javax.persistence.*;
+import javax.validation.constraints.Size;
+import java.util.Set;
+
+@Entity
+public class Poll {
+
+    @Id
+    @GeneratedValue
+    @Column(name = "POLL_ID")
+    private Long id;
+
+    @NotEmpty
+    @Column(name = "QUESTION")
+    private String question;
+
+    @Size(min=2, max = 6)
+    @OneToMany(cascade = CascadeType.ALL)// indicates that a Poll instance can contain zero or more Option instances. The CascadeType.All indicates that any database operations such as persist, remove, or merge on a Poll instance needs to be propagated to all related Option instances
+    @JoinColumn(name = "POLL_ID")// indicates this entity is the owner of the relationship. It has a key to the column with options
+    @OrderBy// orders by ASC default
+    private Set<Option> options;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getQuestion() {
+        return question;
+    }
+
+    public void setQuestion(String question) {
+        this.question = question;
+    }
+
+    public Set<Option> getOptions() {
+        return options;
+    }
+
+    public void setOptions(Set<Option> options) {
+        this.options = options;
+    }
+}

src/main/java/io/zipcoder/tc_spring_poll_application/domain/Vote.java

@@ -0,0 +1,31 @@
+package io.zipcoder.tc_spring_poll_application.domain;
+
+import javax.persistence.*;
+
+@Entity
+public class Vote {
+    @Id
+    @GeneratedValue
+    @Column(name = "VOTE_ID")
+    private Long id;
+
+    @ManyToOne // indicates tha the option instance can have zero or more Vote instances associated with it
+    @JoinColumn(name = "OPTION_ID")
+    private Option option;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Option getOption() {
+        return option;
+    }
+
+    public void setOption(Option option) {
+        this.option = option;
+    }
+}