Stabilize log any value

api/all/src/main/java/io/opentelemetry/api/common/KeyValue.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.api.common;
+
+/**
+ * Key-value pair of {@link String} key and {@link Value} value.
+ *
+ * @see Value#of(KeyValue...)
+ */
+public interface KeyValue {
+
+  /** Returns a {@link KeyValue} for the given {@code key} and {@code value}. */
+  static KeyValue of(String key, Value<?> value) {
+    return KeyValueImpl.create(key, value);
+  }
+
+  /** Returns the key. */
+  String getKey();
+
+  /** Returns the value. */
+  Value<?> getValue();
+}

api/all/src/main/java/io/opentelemetry/api/common/KeyValueImpl.java

@@ -0,0 +1,18 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.api.common;
+
+import com.google.auto.value.AutoValue;
+
+@AutoValue
+abstract class KeyValueImpl implements KeyValue {
+
+  KeyValueImpl() {}
+
+  static KeyValueImpl create(String key, Value<?> value) {
+    return new AutoValue_KeyValueImpl(key, value);
+  }
+}

api/all/src/main/java/io/opentelemetry/api/common/KeyValueList.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.api.common;
+
+import static java.util.stream.Collectors.joining;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+
+final class KeyValueList implements Value<List<KeyValue>> {
+
+  private final List<KeyValue> value;
+
+  private KeyValueList(List<KeyValue> value) {
+    this.value = value;
+  }
+
+  static Value<List<KeyValue>> create(KeyValue... value) {
+    Objects.requireNonNull(value, "value must not be null");
+    List<KeyValue> list = new ArrayList<>(value.length);
+    list.addAll(Arrays.asList(value));
+    return new KeyValueList(Collections.unmodifiableList(list));
+  }
+
+  static Value<List<KeyValue>> createFromMap(Map<String, Value<?>> value) {
+    Objects.requireNonNull(value, "value must not be null");
+    KeyValue[] array =
+        value.entrySet().stream()
+            .map(entry -> KeyValue.of(entry.getKey(), entry.getValue()))
+            .toArray(KeyValue[]::new);
+    return create(array);
+  }
+
+  @Override
+  public ValueType getType() {
+    return ValueType.KEY_VALUE_LIST;
+  }
+
+  @Override
+  public List<KeyValue> getValue() {
+    return value;
+  }
+
+  @Override
+  public String asString() {
+    return value.stream()
+        .map(item -> item.getKey() + "=" + item.getValue().asString())
+        .collect(joining(", ", "[", "]"));
+  }
+
+  @Override
+  public String toString() {
+    return "KeyValueList{" + asString() + "}";
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    return (o instanceof Value) && Objects.equals(this.value, ((Value<?>) o).getValue());
+  }
+
+  @Override
+  public int hashCode() {
+    return value.hashCode();
+  }
+}

api/all/src/main/java/io/opentelemetry/api/common/Value.java

@@ -0,0 +1,117 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.api.common;
+
+import java.nio.ByteBuffer;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Value mirrors the proto <a
+ * href="https://github.com/open-telemetry/opentelemetry-proto/blob/ac3242b03157295e4ee9e616af53b81517b06559/opentelemetry/proto/common/v1/common.proto#L28">AnyValue</a>
+ * message type, and is used to model any type.
+ *
+ * <p>It can be used to represent:
+ *
+ * <ul>
+ *   <li>Primitive values via {@link #of(long)}, {@link #of(String)}, {@link #of(boolean)}, {@link
+ *       #of(double)}.
+ *   <li>String-keyed maps (i.e. associative arrays, dictionaries) via {@link #of(KeyValue...)},
+ *       {@link #of(Map)}. Note, because map values are type {@link Value}, maps can be nested
+ *       within other maps.
+ *   <li>Arrays (heterogeneous or homogenous) via {@link #of(Value[])}. Note, because array values
+ *       are type {@link Value}, arrays can contain primitives, complex types like maps or arrays,
+ *       or any combination.
+ *   <li>Raw bytes via {@link #of(byte[])}
+ * </ul>
+ *
+ * <p>Currently, Value is only used as an argument for {@link
+ * io.opentelemetry.api.logs.LogRecordBuilder#setBody(Value)}.
+ *
+ * @param <T> the type. See {@link #getValue()} for description of types.
+ */
+public interface Value<T> {
+
+  /** Returns an {@link Value} for the {@link String} value. */
+  static Value<String> of(String value) {
+    return ValueString.create(value);
+  }
+
+  /** Returns an {@link Value} for the {@code boolean} value. */
+  static Value<Boolean> of(boolean value) {
+    return ValueBoolean.create(value);
+  }
+
+  /** Returns an {@link Value} for the {@code long} value. */
+  static Value<Long> of(long value) {
+    return ValueLong.create(value);
+  }
+
+  /** Returns an {@link Value} for the {@code double} value. */
+  static Value<Double> of(double value) {
+    return ValueDouble.create(value);
+  }
+
+  /** Returns an {@link Value} for the {@code byte[]} value. */
+  static Value<ByteBuffer> of(byte[] value) {
+    return ValueBytes.create(value);
+  }
+
+  /** Returns an {@link Value} for the array of {@link Value} values. */
+  static Value<List<Value<?>>> of(Value<?>... value) {
+    return ValueArray.create(value);
+  }
+
+  /** Returns an {@link Value} for the list of {@link Value} values. */
+  static Value<List<Value<?>>> of(List<Value<?>> value) {
+    return ValueArray.create(value);
+  }
+
+  /**
+   * Returns an {@link Value} for the array of {@link KeyValue} values. {@link KeyValue#getKey()}
+   * values should not repeat - duplicates may be dropped.
+   */
+  static Value<List<KeyValue>> of(KeyValue... value) {
+    return KeyValueList.create(value);
+  }
+
+  /** Returns an {@link Value} for the {@link Map} of key, {@link Value}. */
+  static Value<List<KeyValue>> of(Map<String, Value<?>> value) {
+    return KeyValueList.createFromMap(value);
+  }
+
+  /** Returns the type of this {@link Value}. Useful for building switch statements. */
+  ValueType getType();
+
+  /**
+   * Returns the value for this {@link Value}.
+   *
+   * <p>The return type varies by {@link #getType()} as described below:
+   *
+   * <ul>
+   *   <li>{@link ValueType#STRING} returns {@link String}
+   *   <li>{@link ValueType#BOOLEAN} returns {@code boolean}
+   *   <li>{@link ValueType#LONG} returns {@code long}
+   *   <li>{@link ValueType#DOUBLE} returns {@code double}
+   *   <li>{@link ValueType#ARRAY} returns {@link List} of {@link Value}
+   *   <li>{@link ValueType#KEY_VALUE_LIST} returns {@link List} of {@link KeyValue}
+   *   <li>{@link ValueType#BYTES} returns read only {@link ByteBuffer}. See {@link
+   *       ByteBuffer#asReadOnlyBuffer()}.
+   * </ul>
+   */
+  T getValue();
+
+  /**
+   * Return a string encoding of this {@link Value}. This is intended to be a fallback serialized
+   * representation in case there is no suitable encoding that can utilize {@link #getType()} /
+   * {@link #getValue()} to serialize specific types.
+   *
+   * <p>WARNING: No guarantees are made about the encoding of this string response. It MAY change in
+   * a future minor release. If you need a reliable string encoding, write your own serializer.
+   */
+  // TODO(jack-berg): Should this be a JSON encoding?
+  String asString();
+}

api/all/src/main/java/io/opentelemetry/api/common/ValueArray.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.api.common;
+
+import static java.util.stream.Collectors.joining;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Objects;
+
+final class ValueArray implements Value<List<Value<?>>> {
+
+  private final List<Value<?>> value;
+
+  private ValueArray(List<Value<?>> value) {
+    this.value = value;
+  }
+
+  static Value<List<Value<?>>> create(Value<?>... value) {
+    Objects.requireNonNull(value, "value must not be null");
+    List<Value<?>> list = new ArrayList<>(value.length);
+    list.addAll(Arrays.asList(value));
+    return new ValueArray(Collections.unmodifiableList(list));
+  }
+
+  static Value<List<Value<?>>> create(List<Value<?>> value) {
+    return new ValueArray(Collections.unmodifiableList(value));
+  }
+
+  @Override
+  public ValueType getType() {
+    return ValueType.ARRAY;
+  }
+
+  @Override
+  public List<Value<?>> getValue() {
+    return value;
+  }
+
+  @Override
+  public String asString() {
+    return value.stream().map(Value::asString).collect(joining(", ", "[", "]"));
+  }
+
+  @Override
+  public String toString() {
+    return "ValueArray{" + asString() + "}";
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    return (o instanceof Value) && Objects.equals(this.value, ((Value<?>) o).getValue());
+  }
+
+  @Override
+  public int hashCode() {
+    return value.hashCode();
+  }
+}

api/incubator/src/main/java/io/opentelemetry/api/incubator/logs/AnyValueBoolean.java → api/all/src/main/java/io/opentelemetry/api/common/ValueBoolean.java

@@ -3,25 +3,25 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-package io.opentelemetry.api.incubator.logs;
+package io.opentelemetry.api.common;
 
 import java.util.Objects;
 
-final class AnyValueBoolean implements AnyValue<Boolean> {
+final class ValueBoolean implements Value<Boolean> {
 
   private final boolean value;
 
-  private AnyValueBoolean(boolean value) {
+  private ValueBoolean(boolean value) {
     this.value = value;
   }
 
-  static AnyValue<Boolean> create(boolean value) {
-    return new AnyValueBoolean(value);
+  static Value<Boolean> create(boolean value) {
+    return new ValueBoolean(value);
   }
 
   @Override
-  public AnyValueType getType() {
-    return AnyValueType.BOOLEAN;
+  public ValueType getType() {
+    return ValueType.BOOLEAN;
   }
 
   @Override
@@ -36,15 +36,15 @@ public String asString() {
 
   @Override
   public String toString() {
-    return "AnyValueBoolean{" + asString() + "}";
+    return "ValueBoolean{" + asString() + "}";
   }
 
   @Override
   public boolean equals(Object o) {
     if (this == o) {
       return true;
     }
-    return (o instanceof AnyValue) && Objects.equals(this.value, ((AnyValue<?>) o).getValue());
+    return (o instanceof Value) && Objects.equals(this.value, ((Value<?>) o).getValue());
   }
 
   @Override