Update Javadoc when setting custom attributes for users.

src/main/java/com/launchdarkly/client/LDUser.java

@@ -15,11 +15,11 @@
  * A {@code LDUser} object contains specific attributes of a user browsing your site. The only mandatory property property is the {@code key},
  * which must uniquely identify each user. For authenticated users, this may be a username or e-mail address. For anonymous users,
  * this could be an IP address or session ID.
- *
+ * <p>
  * Besides the mandatory {@code key}, {@code LDUser} supports two kinds of optional attributes: interpreted attributes (e.g. {@code ip} and {@code country})
  * and custom attributes.  LaunchDarkly can parse interpreted attributes and attach meaning to them. For example, from an {@code ip} address, LaunchDarkly can
  * do a geo IP lookup and determine the user's country.
- *
+ * <p>
  * Custom attributes are not parsed by LaunchDarkly. They can be used in custom rules-- for example, a custom attribute such as "customer_ranking" can be used to
  * launch a feature to the top 10% of users on a site.
  */
@@ -33,7 +33,6 @@ public class LDUser {
   private JsonPrimitive firstName;
   private JsonPrimitive lastName;
   private JsonPrimitive anonymous;
-
   private JsonPrimitive country;
   private Map<String, JsonElement> custom;
   private static final Logger logger = LoggerFactory.getLogger(LDUser.class);
@@ -44,21 +43,22 @@ public class LDUser {
   }
 
   protected LDUser(Builder builder) {
-    this.key = builder.key == null? null : new JsonPrimitive(builder.key);
-    this.ip = builder.ip == null? null : new JsonPrimitive(builder.ip);
-    this.country = builder.country == null? null : new JsonPrimitive(builder.country.getAlpha2());
+    this.key = builder.key == null ? null : new JsonPrimitive(builder.key);
+    this.ip = builder.ip == null ? null : new JsonPrimitive(builder.ip);
+    this.country = builder.country == null ? null : new JsonPrimitive(builder.country.getAlpha2());
     this.secondary = builder.secondary == null ? null : new JsonPrimitive(builder.secondary);
     this.firstName = builder.firstName == null ? null : new JsonPrimitive(builder.firstName);
     this.lastName = builder.lastName == null ? null : new JsonPrimitive(builder.lastName);
     this.email = builder.email == null ? null : new JsonPrimitive(builder.email);
     this.name = builder.name == null ? null : new JsonPrimitive(builder.name);
     this.avatar = builder.avatar == null ? null : new JsonPrimitive(builder.avatar);
-    this.anonymous =  builder.anonymous == null ? null : new JsonPrimitive(builder.anonymous);
+    this.anonymous = builder.anonymous == null ? null : new JsonPrimitive(builder.anonymous);
     this.custom = new HashMap<>(builder.custom);
   }
 
   /**
    * Create a user with the given key
+   *
    * @param key a {@code String} that uniquely identifies a user
    */
   public LDUser(String key) {
@@ -70,23 +70,41 @@ JsonPrimitive getKey() {
     return key;
   }
 
-  JsonPrimitive getIp() { return ip; }
+  JsonPrimitive getIp() {
+    return ip;
+  }
 
-  JsonPrimitive getCountry() { return country; }
+  JsonPrimitive getCountry() {
+    return country;
+  }
 
-  JsonPrimitive getSecondary() { return secondary; }
+  JsonPrimitive getSecondary() {
+    return secondary;
+  }
 
-  JsonPrimitive getName() { return name; }
+  JsonPrimitive getName() {
+    return name;
+  }
 
-  JsonPrimitive getFirstName() { return firstName; }
+  JsonPrimitive getFirstName() {
+    return firstName;
+  }
 
-  JsonPrimitive getLastName() { return lastName; }
+  JsonPrimitive getLastName() {
+    return lastName;
+  }
 
-  JsonPrimitive getEmail() { return email; }
+  JsonPrimitive getEmail() {
+    return email;
+  }
 
-  JsonPrimitive getAvatar() { return avatar; }
+  JsonPrimitive getAvatar() {
+    return avatar;
+  }
 
-  JsonPrimitive getAnonymous() { return anonymous; }
+  JsonPrimitive getAnonymous() {
+    return anonymous;
+  }
 
   JsonElement getCustom(String key) {
     return custom.get(key);
@@ -95,14 +113,13 @@ JsonElement getCustom(String key) {
   /**
    * A <a href="http://en.wikipedia.org/wiki/Builder_pattern">builder</a> that helps construct {@link com.launchdarkly.client.LDUser} objects. Builder
    * calls can be chained, enabling the following pattern:
-   * 
+   * <p>
    * <pre>
    * LDUser user = new LDUser.Builder("key")
    *      .country("US")
    *      .ip("192.168.0.1")
    *      .build()
    * </pre>
-   *
    */
   public static class Builder {
     private String key;
@@ -119,6 +136,7 @@ public static class Builder {
 
     /**
      * Create a builder with the specified key
+     *
      * @param key the unique key for this user
      */
     public Builder(String key) {
@@ -128,6 +146,7 @@ public Builder(String key) {
 
     /**
      * Set the IP for a user
+     *
      * @param s the IP address for the user
      * @return the builder
      */
@@ -145,6 +164,7 @@ public Builder secondary(String s) {
      * Set the country for a user. The country should be a valid <a href="http://en.wikipedia.org/wiki/ISO_3166-1">ISO 3166-1</a>
      * alpha-2 or alpha-3 code. If it is not a valid ISO-3166-1 code, an attempt will be made to look up the country by its name.
      * If that fails, a warning will be logged, and the country will not be set.
+     *
      * @param s the country for the user
      * @return the builder
      */
@@ -156,8 +176,7 @@ public Builder country(String s) {
 
         if (codes.isEmpty()) {
           logger.warn("Invalid country. Expected valid ISO-3166-1 code: " + s);
-        }
-        else if (codes.size() > 1) {
+        } else if (codes.size() > 1) {
           // See if any of the codes is an exact match
           for (LDCountryCode c : codes) {
             if (c.getName().equals(s)) {
@@ -167,8 +186,7 @@ else if (codes.size() > 1) {
           }
           logger.warn("Ambiguous country. Provided code matches multiple countries: " + s);
           country = codes.get(0);
-        }
-        else {
+        } else {
           country = codes.get(0);
         }
 
@@ -189,6 +207,7 @@ public Builder country(LDCountryCode country) {
 
     /**
      * Sets the user's first name
+     *
      * @param firstName the user's first name
      * @return the builder
      */
@@ -199,6 +218,7 @@ public Builder firstName(String firstName) {
 
     /**
      * Sets whether this user is anonymous
+     *
      * @param anonymous whether the user is anonymous
      * @return the builder
      */
@@ -209,6 +229,7 @@ public Builder anonymous(boolean anonymous) {
 
     /**
      * Sets the user's last name
+     *
      * @param lastName the user's last name
      * @return the builder
      */
@@ -219,6 +240,7 @@ public Builder lastName(String lastName) {
 
     /**
      * Sets the user's full name
+     *
      * @param name the user's full name
      * @return the builder
      */
@@ -229,6 +251,7 @@ public Builder name(String name) {
 
     /**
      * Sets the user's avatar
+     *
      * @param avatar the user's avatar
      * @return the builder
      */
@@ -239,6 +262,7 @@ public Builder avatar(String avatar) {
 
     /**
      * Sets the user's e-mail address
+     *
      * @param email the e-mail address
      * @return the builder
      */
@@ -248,62 +272,83 @@ public Builder email(String email) {
     }
 
     /**
-     * Add a {@link java.lang.String}-valued custom attribute
-     * @param k the key for the custom attribute
+     * Add a {@link java.lang.String}-valued custom attribute. When set to one of the
+     * <a href="http://docs.launchdarkly.com/docs/targeting-users#targeting-based-on-user-attributes">
+     *   built-in user attribute keys</a>, this custom attribute will be ignored.
+     *
+     * @param k the key for the custom attribute.
      * @param v the value for the custom attribute
      * @return the builder
+     * @see
      */
     public Builder custom(String k, String v) {
-      if (key != null && v != null) {
+      checkCustomAttribute(k);
+      if (k != null && v != null) {
         custom.put(k, new JsonPrimitive(v));
       }
       return this;
     }
 
     /**
-     * Add a {@link java.lang.Number}-valued custom attribute
-     * @param k the key for the custom attribute
+     * Add a {@link java.lang.Number}-valued custom attribute. When set to one of the
+     * <a href="http://docs.launchdarkly.com/docs/targeting-users#targeting-based-on-user-attributes">
+     *   built-in user attribute keys</a>, this custom attribute will be ignored.
+     *
+     * @param k the key for the custom attribute. When set to one of the built-in user attribute keys, this custom attribute will be ignored.
      * @param n the value for the custom attribute
      * @return the builder
      */
     public Builder custom(String k, Number n) {
-      if (key != null && n != null) {
+      checkCustomAttribute(k);
+      if (k != null && n != null) {
         custom.put(k, new JsonPrimitive(n));
       }
       return this;
     }
 
     /**
-     * Add a {@link java.lang.Boolean}-valued custom attribute
-     * @param k the key for the custom attribute
+     * Add a {@link java.lang.Boolean}-valued custom attribute. When set to one of the
+     * <a href="http://docs.launchdarkly.com/docs/targeting-users#targeting-based-on-user-attributes">
+     *   built-in user attribute keys</a>, this custom attribute will be ignored.
+     *
+     * @param k the key for the custom attribute. When set to one of the built-in user attribute keys, this custom attribute will be ignored.
      * @param b the value for the custom attribute
      * @return the builder
      */
     public Builder custom(String k, Boolean b) {
-      if (key != null && b != null) {
+      checkCustomAttribute(k);
+      if (k != null && b != null) {
         custom.put(k, new JsonPrimitive(b));
       }
       return this;
     }
 
     /**
-     * Add a list of {@link java.lang.String}-valued custom attributes
-     * @param k the key for the list
+     * Add a list of {@link java.lang.String}-valued custom attributes. When set to one of the
+     * <a href="http://docs.launchdarkly.com/docs/targeting-users#targeting-based-on-user-attributes">
+     *   built-in user attribute keys</a>, this custom attribute will be ignored.
+     *
+     * @param k  the key for the list. When set to one of the built-in user attribute keys, this custom attribute will be ignored.
      * @param vs the values for the attribute
      * @return the builder
      * @deprecated As of version 0.16.0, renamed to {@link #customString(String, List) customString}
      */
     public Builder custom(String k, List<String> vs) {
+      checkCustomAttribute(k);
       return this.customString(k, vs);
     }
-    
+
     /**
-     * Add a list of {@link java.lang.String}-valued custom attributes
-     * @param k the key for the list
+     * Add a list of {@link java.lang.String}-valued custom attributes. When set to one of the
+     * <a href="http://docs.launchdarkly.com/docs/targeting-users#targeting-based-on-user-attributes">
+     *   built-in user attribute keys</a>, this custom attribute will be ignored.
+     *
+     * @param k  the key for the list. When set to one of the built-in user attribute keys, this custom attribute will be ignored.
      * @param vs the values for the attribute
      * @return the builder
      */
     public Builder customString(String k, List<String> vs) {
+      checkCustomAttribute(k);
       JsonArray array = new JsonArray();
       for (String v : vs) {
         if (v != null) {
@@ -313,14 +358,18 @@ public Builder customString(String k, List<String> vs) {
       custom.put(k, array);
       return this;
     }
-    
+
     /**
-     * Add a list of {@link java.lang.Integer}-valued custom attributes
-     * @param k the key for the list
+     * Add a list of {@link java.lang.Integer}-valued custom attributes. When set to one of the
+     * <a href="http://docs.launchdarkly.com/docs/targeting-users#targeting-based-on-user-attributes">
+     *   built-in user attribute keys</a>, this custom attribute will be ignored.
+     *
+     * @param k  the key for the list. When set to one of the built-in user attribute keys, this custom attribute will be ignored.
      * @param vs the values for the attribute
      * @return the builder
      */
     public Builder customNumber(String k, List<Number> vs) {
+      checkCustomAttribute(k);
       JsonArray array = new JsonArray();
       for (Number v : vs) {
         if (v != null) {
@@ -331,8 +380,18 @@ public Builder customNumber(String k, List<Number> vs) {
       return this;
     }
 
+    private void checkCustomAttribute(String key) {
+      for (UserAttribute a : UserAttribute.values()) {
+        if (a.name().equals(key)) {
+          logger.warn("Built-in attribute key: " + key + " added as custom attribute! This custom attribute will be ignored during Feature Flag evaluation");
+          return;
+        }
+      }
+    }
+
     /**
      * Build the configured {@link com.launchdarkly.client.LDUser} object
+     *
      * @return the {@link com.launchdarkly.client.LDUser} configured by this builder
      */
     public LDUser build() {

src/main/java/com/launchdarkly/client/UserAttribute.java

@@ -0,0 +1,14 @@
+package com.launchdarkly.client;
+
+enum UserAttribute {
+  key,
+  secondary,
+  ip,
+  email,
+  name,
+  avatar,
+  firstName,
+  lastName,
+  anonymous,
+  country
+}