Add poll and participant DAL classes

Beware the two-way mapping between the two. I had to use @JsonIgnore to avoid the JS infinite loop.

Author: Ferenc Hammerl

src/main/java/com/fhammerl/polls/models/Participant.java

@@ -0,0 +1,54 @@
+package com.fhammerl.polls.models;
+
+import javax.persistence.Entity;
+import javax.persistence.FetchType;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.ManyToOne;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
+@Entity(name = "participant")
+public class Participant {
+    @Id
+    private Integer id;
+    private String name;
+    private String email;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "poll_id")
+    private Poll poll;
+
+    public Integer getId() {
+        return this.id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return this.name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getEmail() {
+        return this.email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    @JsonIgnore
+    public Poll getPoll() {
+        return this.poll;
+    }
+
+    public void setPoll(Poll poll) {
+        this.poll = poll;
+    }
+}

src/main/java/com/fhammerl/polls/models/Poll.java

@@ -0,0 +1,93 @@
+package com.fhammerl.polls.models;
+
+import java.util.Date;
+import java.util.List;
+
+import javax.persistence.CascadeType;
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.FetchType;
+import javax.persistence.Id;
+import javax.persistence.OneToMany;
+
+@Entity(name = "poll")
+public class Poll {
+    @Id
+    @Column(name = "id")
+    private String id;
+    @Column(name = "latest_change")
+    private Date latestChange;
+    private Date initiated;
+    private boolean hidden;
+    private String preferencesType;
+    private String state;
+    private String title;
+
+    @OneToMany(mappedBy = "poll", cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.LAZY)
+    private List<Participant> participants;
+
+    public String getId() {
+        return this.id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    public Date getLatestChange() {
+        return this.latestChange;
+    }
+
+    public void setLatestChange(Date latestChange) {
+        this.latestChange = latestChange;
+    }
+
+    public Date getInitiated() {
+        return this.initiated;
+    }
+
+    public void setInitiated(Date initiated) {
+        this.initiated = initiated;
+    }
+
+    public boolean getHidden() {
+        return this.hidden;
+    }
+
+    public void setHidden(boolean hidden) {
+        this.hidden = hidden;
+    }
+
+    public String getPreferencesType() {
+        return this.preferencesType;
+    }
+
+    public void setPreferencesType(String preferencesType) {
+        this.preferencesType = preferencesType;
+    }
+
+    public String getState() {
+        return this.state;
+    }
+
+    public void setState(String state) {
+        this.state = state;
+    }
+
+    public String getTitle() {
+        return this.title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public List<Participant> getParticipants() {
+        return this.participants;
+    }
+
+    public void setParticipants(List<Participant> participant) {
+        this.participants = participant;
+    }
+
+}

src/main/java/com/fhammerl/polls/repositories/PollRepository.java

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+package com.fhammerl.polls.repositories;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import com.fhammerl.polls.models.Poll;
+
+public interface PollRepository extends JpaRepository<Poll, Long> {
+}