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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

@@ -9,24 +9,21 @@ import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 import org.springframework.web.servlet.support.ServletUriComponentsBuilder;
 
-import javax.inject.Inject;
 import java.net.URI;
 
-@RestController
+@RestController// marks entity as a controller following REST specs
 public class PollController {
 
-    @Inject
     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)
+    @RequestMapping(value="/polls", method= RequestMethod.GET)//maps web requests to entities with the @RequestMapping
     public ResponseEntity<Iterable<Poll>> getAllPolls() {
-        Iterable<Poll> allPolls = pollRepository.findAll();
+        Iterable<Poll> allPolls = pollRepository.findAll(); // reads all the polls using poll repository
         return new ResponseEntity<>(allPolls, HttpStatus.OK);
     }
 
@@ -35,7 +32,7 @@ public class PollController {
         poll = pollRepository.save(poll);
         HttpHeaders newHeaders = new HttpHeaders();
 
-        URI newPollUri = ServletUriComponentsBuilder
+        URI newPollUri = ServletUriComponentsBuilder //allows the client to have a way to know the uri of the created poll
                 .fromCurrentRequest()
                 .path("/{id}")
                 .buildAndExpand(poll.getId())

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

@@ -9,8 +9,10 @@ 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
@@ -36,6 +38,6 @@ public class VoteController {
 
     @RequestMapping(value="/polls/{pollId}/votes", method=RequestMethod.GET)
     public Iterable<Vote> getVote(@PathVariable Long pollId) {
-        return voteRepository.findById(pollId);
+        return voteRepository.findVotesByPoll(pollId);
     }
 }

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

@@ -8,9 +8,9 @@ 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
+    @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 persisitence property. Without this annotation the framework assumes the field's variable-name is the persistent property
+    @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

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

@@ -14,9 +14,9 @@ public class Poll {
     @Column(name = "QUESTION")
     private String question;
 
-    @OneToMany(cascade = CascadeType.ALL)
-    @JoinColumn(name = "POLL_ID")
-    @OrderBy
+    @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() {

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

@@ -9,7 +9,7 @@ public class Vote {
     @Column(name = "VOTE_ID")
     private Long id;
 
-    @ManyToOne
+    @ManyToOne // indicates tha the option instance can have zero or more Vote instances associated with it
     @JoinColumn(name = "OPTION_ID")
     private Option option;
 

src/main/java/io/zipcoder/tc_spring_poll_application/exception/ResourceNotFoundException.java

@@ -0,0 +1,20 @@
+package io.zipcoder.tc_spring_poll_application.exception;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+@ResponseStatus(HttpStatus.NOT_FOUND)
+public class ResourceNotFoundException extends  RuntimeException{
+
+    public ResourceNotFoundException(){
+
+    }
+
+    public ResourceNotFoundException(String message){
+        super(message);
+    }
+
+    public ResourceNotFoundException(String message, Throwable cause){
+        super(message, cause);
+    }
+}