fix a few warnings and removed deprecated methods

api/src/main/java/openconsensus/internal/Utils.java

@@ -102,6 +102,7 @@ public static void checkIndex(int index, int size) {
    * @param arg the argument to check for null.
    * @param errorMessage the message to use for the exception. Will be converted to a string using
    *     {@link String#valueOf(Object)}.
+   * @param <T> type of an argument to check.
    * @return the argument, if it passes the null check.
    */
   public static <T> T checkNotNull(T arg, @javax.annotation.Nullable Object errorMessage) {
@@ -117,6 +118,7 @@ public static <T> T checkNotNull(T arg, @javax.annotation.Nullable Object errorM
    * @param list the argument list to check for null.
    * @param errorMessage the message to use for the exception. Will be converted to a string using
    *     {@link String#valueOf(Object)}.
+   * @param <T> type of an argument to check.
    */
   public static <T> void checkListElementNotNull(
       List<T> list, @javax.annotation.Nullable Object errorMessage) {
@@ -130,6 +132,10 @@ public static <T> void checkListElementNotNull(
   /**
    * Compares two Objects for equality. This functionality is provided by {@code
    * Objects.equal(Object, Object)} in Java 7.
+   *
+   * @param x object to compare with.
+   * @param y object to compare to.
+   * @return {@code true} if x is the same as the y; {@code false} otherwise.
    */
   public static boolean equalsObjects(
       @javax.annotation.Nullable Object x, @javax.annotation.Nullable Object y) {

api/src/main/java/openconsensus/stats/MeasureMap.java

@@ -19,7 +19,6 @@
 import javax.annotation.concurrent.NotThreadSafe;
 import openconsensus.internal.Utils;
 import openconsensus.metrics.data.AttachmentValue;
-import openconsensus.metrics.data.AttachmentValue.AttachmentValueString;
 import openconsensus.stats.data.Measure;
 import openconsensus.stats.data.Measure.MeasureDouble;
 import openconsensus.stats.data.Measure.MeasureLong;
@@ -55,23 +54,6 @@ public abstract class MeasureMap {
    */
   public abstract MeasureMap put(MeasureLong measure, long value);
 
-  /**
-   * Associate the contextual information of an {@code Exemplar} to this {@link MeasureMap}.
-   * Contextual information is represented as {@code String} key-value pairs.
-   *
-   * <p>If this method is called multiple times with the same key, only the last value will be kept.
-   *
-   * @param key the key of contextual information of an {@code Exemplar}.
-   * @param value the string representation of contextual information of an {@code Exemplar}.
-   * @return this
-   * @since 0.1.0
-   * @deprecated in favor of {@link #putAttachment(String, AttachmentValue)}.
-   */
-  @Deprecated
-  public MeasureMap putAttachment(String key, String value) {
-    return putAttachment(key, AttachmentValueString.create(value));
-  }
-
   /**
    * Associate the contextual information of an {@code Exemplar} to this {@link MeasureMap}.
    * Contextual information is represented as a {@code String} key and an {@link AttachmentValue}.

api/src/main/java/openconsensus/stats/Stats.java

@@ -31,6 +31,7 @@ public final class Stats {
   /**
    * Returns the default {@link StatsRecorder}.
    *
+   * @return stats recorder.
    * @since 0.1.0
    */
   public static StatsRecorder getStatsRecorder() {
@@ -40,6 +41,7 @@ public static StatsRecorder getStatsRecorder() {
   /**
    * Returns the default {@link ViewManager}.
    *
+   * @return view manager.
    * @since 0.1.0
    */
   public static ViewManager getViewManager() {

api/src/main/java/openconsensus/stats/StatsComponent.java

@@ -32,6 +32,7 @@ public abstract class StatsComponent {
   /**
    * Returns the default {@link StatsRecorder}.
    *
+   * @return stats recorder.
    * @since 0.1.0
    */
   public abstract StatsRecorder getStatsRecorder();

api/src/main/java/openconsensus/stats/view/data/Aggregation.java

@@ -124,43 +124,6 @@ public final <T> T match(
     }
   }
 
-  /**
-   * Calculate mean on aggregated {@code MeasureValue}s.
-   *
-   * @since 0.1.0
-   * @deprecated since 0.13, use {@link Distribution} instead.
-   */
-  @Immutable
-  @AutoValue
-  @Deprecated
-  @AutoValue.CopyAnnotations
-  public abstract static class Mean extends Aggregation {
-
-    Mean() {}
-
-    private static final Mean INSTANCE = new AutoValue_Aggregation_Mean();
-
-    /**
-     * Construct a {@code Mean}.
-     *
-     * @return a new {@code Mean}.
-     * @since 0.1.0
-     */
-    public static Mean create() {
-      return INSTANCE;
-    }
-
-    @Override
-    public final <T> T match(
-        Function<? super Sum, T> p0,
-        Function<? super Count, T> p1,
-        Function<? super Distribution, T> p2,
-        Function<? super LastValue, T> p3,
-        Function<? super Aggregation, T> defaultFunction) {
-      return defaultFunction.apply(this);
-    }
-  }
-
   /**
    * Calculate distribution stats on aggregated {@code MeasureValue}s. Distribution includes mean,
    * count, histogram, min, max and sum of squared deviations.
@@ -176,6 +139,7 @@ public abstract static class Distribution extends Aggregation {
     /**
      * Construct a {@code Distribution}.
      *
+     * @param bucketBoundaries bucket boundaries to use for distribution.
      * @return a new {@code Distribution}.
      * @since 0.1.0
      */

api/src/main/java/openconsensus/stats/view/data/View.java

@@ -43,27 +43,31 @@ public abstract class View {
   /**
    * Name of view. Must be unique.
    *
+   * @return name of the view.
    * @since 0.1.0
    */
   public abstract Name getName();
 
   /**
    * More detailed description, for documentation purposes.
    *
+   * @return description of the view.
    * @since 0.1.0
    */
   public abstract String getDescription();
 
   /**
    * Measure type of this view.
    *
+   * @return measure type of this view.
    * @since 0.1.0
    */
   public abstract Measure getMeasure();
 
   /**
    * The {@link Aggregation} associated with this {@link View}.
    *
+   * @return the {@link Aggregation} associated with this {@link View}.
    * @since 0.1.0
    */
   public abstract Aggregation getAggregation();
@@ -74,6 +78,7 @@ public abstract class View {
    * <p>{@link Measure} will be recorded in a "greedy" way. That is, every view aggregates every
    * measure. This is similar to doing a GROUPBY on view’s columns. Columns must be unique.
    *
+   * @return columns (a.k.a Tag Keys) to match with the associated {@link Measure}.
    * @since 0.1.0
    */
   public abstract List<TagKey> getColumns();

api/src/main/java/openconsensus/tags/data/Tag.java

@@ -29,30 +29,12 @@
 @AutoValue
 public abstract class Tag {
 
-  private static final TagMetadata METADATA_UNLIMITED_PROPAGATION =
+  /** Default propagation metadata - unlimited propagation. */
+  public static final TagMetadata METADATA_UNLIMITED_PROPAGATION =
       TagMetadata.create(TagTtl.UNLIMITED_PROPAGATION);
 
   Tag() {}
 
-  /**
-   * Creates a {@code Tag} from the given key and value.
-   *
-   * <p>For backwards-compatibility this method still produces propagating {@link Tag}s.
-   *
-   * <p>This is equivalent to calling {@code create(key, value,
-   * TagMetadata.create(TagTtl.UNLIMITED_PROPAGATION))}.
-   *
-   * @param key the tag key.
-   * @param value the tag value.
-   * @return a {@code Tag} with the given key and value.
-   * @since 0.1.0
-   * @deprecated in favor of {@link #create(TagKey, TagValue, TagMetadata)}.
-   */
-  @Deprecated
-  public static Tag create(TagKey key, TagValue value) {
-    return create(key, value, METADATA_UNLIMITED_PROPAGATION);
-  }
-
   /**
    * Creates a {@code Tag} from the given key, value and metadata.
    *

api/src/main/java/openconsensus/trace/propagation/TextFormat.java

@@ -87,6 +87,7 @@ public abstract class TextFormat {
    * clear fields as they couldn't have been set before. If it is a mutable, retryable object,
    * successive calls should clear these fields first.
    *
+   * @return list of fields that will be used by this formatter.
    * @since 0.1.0
    */
   // The use cases of this are:
@@ -100,6 +101,7 @@ public abstract class TextFormat {
    * @param spanContext possibly not sampled.
    * @param carrier holds propagation fields. For example, an outgoing message or http request.
    * @param setter invoked for each propagation key to add or remove.
+   * @param <C> carrier of propagation fields, such as an http request
    * @since 0.1.0
    */
   public abstract <C> void inject(SpanContext spanContext, C carrier, Setter<C> setter);
@@ -134,6 +136,8 @@ public abstract static class Setter<C> {
    *
    * @param carrier holds propagation fields. For example, an outgoing message or http request.
    * @param getter invoked for each propagation key to get.
+   * @param <C> carrier of propagation fields, such as an http request.
+   * @return carrier of propagated fields.
    * @throws SpanContextParseException if the input is invalid
    * @since 0.1.0
    */
@@ -146,15 +150,15 @@ public abstract <C> SpanContext extract(C carrier, Getter<C> getter)
    * <p>{@code Getter} is stateless and allows to be saved as a constant to avoid runtime
    * allocations.
    *
-   * @param <C> carrier of propagation fields, such as an http request
+   * @param <C> carrier of propagation fields, such as an http request.
    * @since 0.1.0
    */
   public abstract static class Getter<C> {
 
     /**
      * Returns the first value of the given propagation {@code key} or returns {@code null}.
      *
-     * @param carrier carrier of propagation fields, such as an http request
+     * @param carrier carrier of propagation fields, such as an http request.
      * @param key the key of the field.
      * @return the first value of the given propagation {@code key} or returns {@code null}.
      * @since 0.1.0