Add ActorId

sdk/src/main/java/io/dapr/actors/ActorId.java

@@ -5,10 +5,146 @@
 
 package io.dapr.actors;
 
+import java.util.UUID;
+
 /**
- * Stub
+ * The ActorId represents the identity of an actor within an actor service.
+ */
+public class ActorId extends Object implements Comparable<ActorId> {
+
+    /**
+     * The ID of the actor as a String.
+     */
+    private final String stringId;
+
+    /**
+     * An error message for an invalid constructor arg.
+     */
+    private final String errorMsg = "actor needs to be initialized with an id!";
+
+    /**
+     * Initializes a new instance of the ActorId class with the id passed in.
+     *
+     * @param id Value for actor id
      */
-public class ActorId {
     public ActorId(String id) {
+        if (id != null) {
+            this.stringId = id;
+        } else {
+            throw new IllegalArgumentException(errorMsg);
+        }
+    }
+
+    /**
+     * Returns the id of the actor as {link #java.lang.String}
+     *
+     * @return ActorID as {link #java.lang.String}
+     */
+    public String getStringId() {
+        return this.stringId;
+    }
+
+    /**
+     * Creates a new ActorId with a random id.
+     *
+     * @return A new ActorId with a random id.
+     */
+    public static ActorId createRandom() {
+        UUID id = UUID.randomUUID();
+        return new ActorId(id.toString());
+    }
+
+    /**
+     * Determines whether two specified actorIds have the same id.
+     *
+     * @param id1 The first actorId to compare, or null
+     * @param id2 The second actorId to compare, or null.
+     * @return true if the id is same for both objects; otherwise, false.
+     */
+    static public boolean equals(ActorId id1, ActorId id2) {
+        if (id1 == null && id2 == null) {
+            return true;
+        } else if (id2 == null || id1 == null) {
+            return false;
+        } else {
+            return hasEqualContent(id1, id2);
+        }
+    }
+
+    /**
+     * Compares this instance with a specified {link #ActorId} object and
+     * indicates whether this instance precedes, follows, or appears in the same
+     * position in the sort order as the specified actorId.
+     * <p>
+     * The comparison is done based on the id if both the instances.
+     *
+     * @param other The actorId to compare with this instance.
+     * @return A 32-bit signed integer that indicates whether this instance
+     * precedes, follows, or appears in the same position in the sort order as the
+     * other parameter.
+     */
+    @Override
+    public int compareTo(ActorId other) {
+        return (other == null) ? 1
+                : compareContent(this, other);
+    }
+
+    /**
+     *
+     * @param id1
+     * @param id2
+     * @return true if the two ActorId's are equal
+     */
+    static private boolean hasEqualContent(ActorId id1, ActorId id2) {
+        return id1.getStringId().equalsIgnoreCase(id2.getStringId());
+    }
+
+    /**
+     *
+     * @param id1
+     * @param id2
+     * @return -1, 0, or 1 depending on the compare result of the stringId member.
+     */
+    private int compareContent(ActorId id1, ActorId id2) {
+        return id1.getStringId().compareToIgnoreCase(id2.getStringId());
+    }
+
+    /**
+     *
+     * @return The String representation of this ActorId
+     */
+    @Override
+    public String toString() {
+        return this.stringId;
+    }
+
+    /**
+     *
+     * @return The hash code of this ActorId
+     */
+    @Override
+    public int hashCode() {
+        return this.stringId.hashCode();
+    }
+
+    /**
+     *
+     * @return true if the 2 ActorId's are equal.
+     */
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+
+        if (obj == null) {
+            return false;
+        }
+
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+
+        return hasEqualContent(this, (ActorId) obj);
     }
 }

sdk/src/test/java/io/dapr/actors/ActorIdTest.java

@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) Microsoft Corporation.
+ * Licensed under the MIT License.
+ */
+
+package io.dapr.actors;
+
+import java.util.*;
+import java.lang.String;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * Unit tests for ActorId.
+ */
+public class ActorIdTest {
+
+    @Test(expected = IllegalArgumentException.class)
+    public void initializeNewActorIdObjectWithNullId() {
+        ActorId actorId = new ActorId(null);
+    }
+
+    @Test
+    public void getId() {
+        String id = "123";
+        ActorId actorId = new ActorId(id);
+        Assert.assertEquals(id, actorId.getStringId());
+    }
+
+    @Test
+    public void verifyToString() {
+        String id = "123";
+        ActorId actorId = new ActorId(id);
+        Assert.assertEquals(id, actorId.toString());
+    }
+
+    @Test
+    public void verifyEqualsByObject() {
+        List<Wrapper> values = createEqualsTestValues();
+        for (Wrapper w : values) {
+            Assert.assertEquals(w.expectedResult, w.item1.equals(w.item2));
+        }
+    }
+
+    @Test
+    public void verifyEqualsByActorId() {
+        List<Wrapper> values = createEqualsTestValues();
+        for (Wrapper w : values) {
+            ActorId a1 = (ActorId) w.item1;
+            ActorId a2 = (ActorId) w.item2;
+            Assert.assertEquals(w.expectedResult, a1.equals(a2));
+        }
+    }
+
+    @Test
+    public void verifyCompareTo() {
+        List<Wrapper> values = createComparesToTestValues();
+        for (Wrapper w : values) {
+            ActorId a1 = (ActorId) w.item1;
+            ActorId a2 = (ActorId) w.item2;
+            Assert.assertEquals(w.expectedResult, a1.compareTo(a2));
+        }
+    }
+
+    private List<Wrapper> createEqualsTestValues() {
+        List<Wrapper> list = new ArrayList<Wrapper>();
+        list.add(new Wrapper(new ActorId("1"), null, false));
+        list.add(new Wrapper(new ActorId("1"), new ActorId("1"), true));
+        list.add(new Wrapper(new ActorId("1"), new ActorId("2"), false));
+
+        return list;
+    }
+
+    private List<Wrapper> createComparesToTestValues() {
+        List<Wrapper> list = new ArrayList<Wrapper>();
+        list.add(new Wrapper(new ActorId("1"), null, 1));
+        list.add(new Wrapper(new ActorId("1"), new ActorId("1"), 0));
+        list.add(new Wrapper(new ActorId("1"), new ActorId("2"), -1));
+        list.add(new Wrapper(new ActorId("2"), new ActorId("1"), 1));
+
+        return list;
+    }
+    
+    class Wrapper<T> {
+        public Object item1;
+        public Object item2;
+        public T expectedResult;
+
+        public Wrapper(Object i, Object j, T e) {
+            this.item1 = i;
+            this.item2 = j;
+            this.expectedResult = e;
+        }
+    }
+}