Add Bazel example using new macros.

RELNOTES=Update Bazel example.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=315488934

examples/BUILD

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+# Copyright (C) 2020 The Dagger Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# Description:
+#   Dagger examples
+
+package(default_visibility = ["//:src"])

examples/bazel/BUILD

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+# Copyright (C) 2020 The Dagger Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# Description:
+#   Dagger Bazel examples
+
+load("@dagger//:workspace_defs.bzl", "dagger_rules")
+
+dagger_rules()

examples/bazel/WORKSPACE

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+# Copyright (C) 2020 The Dagger Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# Description:
+#   Defines the Bazel workspace rules for the Dagger examples.
+
+########################
+# Load Dagger repository
+########################
+
+# TODO(user): Replace with `http_archive` pointing to tagged released.
+local_repository(
+    name = "dagger",
+    path = "../../",
+)
+
+load("@dagger//:workspace_defs.bzl", "DAGGER_ARTIFACTS", "DAGGER_REPOSITORIES")
+
+#########################
+# Load Android repository
+#########################
+
+android_sdk_repository(
+    name = "androidsdk",
+    api_level = 29,
+    build_tools_version = "29.0.2",
+)
+
+#############################
+# Load Robolectric repository
+#############################
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+http_archive(
+    name = "robolectric",
+    strip_prefix = "robolectric-bazel-4.1",
+    urls = ["https://github.com/robolectric/robolectric-bazel/archive/4.1.tar.gz"],
+)
+
+load("@robolectric//bazel:robolectric.bzl", "robolectric_repositories")
+
+robolectric_repositories()
+
+#########################
+# Load Maven repositories
+#########################
+
+RULES_JVM_EXTERNAL_TAG = "2.7"
+
+RULES_JVM_EXTERNAL_SHA = "f04b1466a00a2845106801e0c5cec96841f49ea4e7d1df88dc8e4bf31523df74"
+
+http_archive(
+    name = "rules_jvm_external",
+    sha256 = RULES_JVM_EXTERNAL_SHA,
+    strip_prefix = "rules_jvm_external-%s" % RULES_JVM_EXTERNAL_TAG,
+    url = "https://github.com/bazelbuild/rules_jvm_external/archive/%s.zip" % RULES_JVM_EXTERNAL_TAG,
+)
+
+load("@rules_jvm_external//:defs.bzl", "maven_install")
+
+maven_install(
+    artifacts = DAGGER_ARTIFACTS + [
+        "androidx.test.ext:junit:1.1.1",
+        "androidx.test:runner:1.1.1",
+        "com.google.truth:truth:1.0.1",
+        "junit:junit:4.13",
+        "org.robolectric:robolectric:4.1",
+        "org.robolectric:annotations:4.1",
+    ],
+    repositories = DAGGER_REPOSITORIES,
+)

examples/bazel/java/example/common/BUILD

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+# Copyright (C) 2020 The Dagger Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+java_library(
+    name = "common",
+    srcs = glob(["*.java"]),
+    visibility = [
+        "//java/example:__subpackages__",
+        "//javatests/example:__subpackages__",
+    ],
+    deps = [
+        "//:dagger",
+    ],
+)

examples/bazel/java/example/common/CoffeeLogger.java

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+/*
+ * Copyright (C) 2020 The Dagger Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package example.common;
+
+import java.util.ArrayList;
+import java.util.List;
+import javax.inject.Inject;
+import javax.inject.Singleton;
+
+/** A logger to logs steps while brewing coffee. */
+@Singleton
+public final class CoffeeLogger {
+  private final List<String> logs = new ArrayList<>();
+
+  @Inject
+  CoffeeLogger() {}
+
+  public void log(String msg) {
+    logs.add(msg);
+  }
+
+  public List<String> logs() {
+    return new ArrayList<>(logs);
+  }
+}

examples/bazel/java/example/common/CoffeeMaker.java

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+/*
+ * Copyright (C) 2020 The Dagger Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package example.common;
+
+import dagger.Lazy;
+import javax.inject.Inject;
+
+/** A coffee maker to brew the coffee. */
+public class CoffeeMaker {
+  private final CoffeeLogger logger;
+  private final Lazy<Heater> heater; // Create a possibly costly heater only when we use it.
+  private final Pump pump;
+
+  @Inject
+  CoffeeMaker(CoffeeLogger logger, Lazy<Heater> heater, Pump pump) {
+    this.logger = logger;
+    this.heater = heater;
+    this.pump = pump;
+  }
+
+  public void brew() {
+    heater.get().on();
+    pump.pump();
+    logger.log(" [_]P coffee! [_]P ");
+    heater.get().off();
+  }
+}

examples/bazel/java/example/common/ElectricHeater.java

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+/*
+ * Copyright (C) 2020 The Dagger Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package example.common;
+
+import javax.inject.Inject;
+
+/** An electric heater to heat the coffee. */
+public class ElectricHeater implements Heater {
+
+  private final CoffeeLogger logger;
+  private boolean heating;
+
+  @Inject
+  ElectricHeater(CoffeeLogger logger) {
+    this.logger = logger;
+  }
+
+  @Override
+  public void on() {
+    this.heating = true;
+    logger.log("~ ~ ~ heating ~ ~ ~");
+  }
+
+  @Override
+  public void off() {
+    this.heating = false;
+  }
+
+  @Override
+  public boolean isHot() {
+    return heating;
+  }
+}

examples/bazel/java/example/common/Heater.java

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+/*
+ * Copyright (C) 2020 The Dagger Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package example.common;
+
+/** A heater to heat the coffee. */
+public interface Heater {
+  void on();
+  void off();
+  boolean isHot();
+}

examples/bazel/java/example/common/Pump.java

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+/*
+ * Copyright (C) 2020 The Dagger Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package example.common;
+
+/** A pump to pump the coffee. */
+public interface Pump {
+  void pump();
+}

examples/bazel/java/example/common/Thermosiphon.java

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+/*
+ * Copyright (C) 2020 The Dagger Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package example.common;
+
+import javax.inject.Inject;
+
+/** A thermosiphon to pump the coffee. */
+public class Thermosiphon implements Pump {
+  private final CoffeeLogger logger;
+  private final Heater heater;
+
+  @Inject
+  Thermosiphon(CoffeeLogger logger, Heater heater) {
+    this.logger = logger;
+    this.heater = heater;
+  }
+
+  @Override
+  public void pump() {
+    if (heater.isHot()) {
+      logger.log("=> => pumping => =>");
+    }
+  }
+}

examples/bazel/java/example/dagger/BUILD

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+# Copyright (C) 2020 The Dagger Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+java_binary(
+    name = "dagger",
+    srcs = glob(["*.java"]),
+    main_class = "dagger.coffee.CoffeeApp",
+    deps = [
+        "//:dagger",
+        "//java/example/common",
+    ],
+)