Move all examples into Bazel workspace

Those examples will be used for Bazel integration tests and their
sources should be available directly to the Bazel workspace itself.

--
MOS_MIGRATED_REVID=89380736

9 files changed, 198 insertions, 0 deletions

diff --git a/examples/java-native/README.md b/examples/java-native/README.md
new file mode 100644
index 0000000000..fb37462bf3
--- /dev/null
+++ b/examples/java-native/README.md
@@ -0,0 +1,4 @@
+Java Examples
+=============
+
+This directory contains examples for Java language rules.
diff --git a/examples/java-native/src/main/java/com/example/myproject/BUILD b/examples/java-native/src/main/java/com/example/myproject/BUILD
new file mode 100644
index 0000000000..717625343b
--- /dev/null
+++ b/examples/java-native/src/main/java/com/example/myproject/BUILD
@@ -0,0 +1,24 @@
+package(default_visibility = ["//visibility:public"])
+
+java_binary(
+    name = "hello-world",
+    main_class = "com.example.myproject.Greeter",
+    runtime_deps = [":hello-lib"],
+)
+
+java_library(
+    name = "hello-lib",
+    srcs = glob(["*.java"]),
+)
+
+java_binary(
+    name = "hello-resources",
+    main_class = "com.example.myproject.Greeter",
+    runtime_deps = [":custom-greeting"],
+)
+
+java_library(
+    name = "custom-greeting",
+    srcs = ["Greeter.java"],
+    resources = ["//examples/java-native/src/main/resources:greeting"],
+)
diff --git a/examples/java-native/src/main/java/com/example/myproject/Greeter.java b/examples/java-native/src/main/java/com/example/myproject/Greeter.java
new file mode 100644
index 0000000000..4123f2e202
--- /dev/null
+++ b/examples/java-native/src/main/java/com/example/myproject/Greeter.java
@@ -0,0 +1,49 @@
+package com.example.myproject;
+
+import java.io.InputStream;
+import java.io.PrintStream;
+import java.util.Scanner;
+
+/**
+ * Prints a greeting which can be customized by building with resources and/or passing in command-
+ * line arguments.
+ *
+ * <p>Building and running this file will print "Hello world". Build and run the
+ * //examples/java-native/src/main/java/com/example/myproject:hello-world target to demonstrate
+ * this.</p>
+ *
+ * <p>If this is built with a greeting.txt resource included, it will replace "Hello" with the
+ * contents of greeting.txt. The
+ * //examples/java-native/src/main/java/com/example/myproject:hello-resources target demonstrates
+ * this.</p>
+ *
+ * <p>If arguments are passed to the binary on the command line, the first argument will replace
+ * "world" in the output. See //examples/java-native/src/test/java/com/example/myproject:hello's
+ * argument test.</p>
+ */
+public class Greeter {
+  static PrintStream out = System.out;
+
+  public static String convertStreamToString(InputStream is) throws Exception {
+    try (Scanner s = new Scanner(is)) {
+      s.useDelimiter("\n");
+      return s.hasNext() ? s.next() : "";
+    }
+  }
+
+  public void hello(String obj) throws Exception {
+    String greeting = "Hello";
+    InputStream stream  = Greeter.class.getResourceAsStream(
+        "/examples/java-native/src/main/resources/greeting.txt");
+    if (stream != null) {
+      greeting = convertStreamToString(stream);
+    }
+    out.println(greeting + " " + obj);
+  }
+
+  public static void main(String... args) throws Exception {
+    Greeter g = new Greeter();
+    String obj = args.length > 0 ? args[0] : "world";
+    g.hello(obj);
+  }
+}
diff --git a/examples/java-native/src/main/resources/BUILD b/examples/java-native/src/main/resources/BUILD
new file mode 100644
index 0000000000..8347a3555a
--- /dev/null
+++ b/examples/java-native/src/main/resources/BUILD
@@ -0,0 +1,6 @@
+package(default_visibility = ["//visibility:public"])
+
+filegroup(
+    name = "greeting",
+    srcs = ["greeting.txt"],
+)
diff --git a/examples/java-native/src/main/resources/greeting.txt b/examples/java-native/src/main/resources/greeting.txt
new file mode 100644
index 0000000000..09170083fc
--- /dev/null
+++ b/examples/java-native/src/main/resources/greeting.txt
@@ -0,0 +1 @@
+Bye
diff --git a/examples/java-native/src/test/java/com/example/myproject/BUILD b/examples/java-native/src/test/java/com/example/myproject/BUILD
new file mode 100644
index 0000000000..838107650c
--- /dev/null
+++ b/examples/java-native/src/test/java/com/example/myproject/BUILD
@@ -0,0 +1,33 @@
+java_test(
+    name = "hello",
+    srcs = ["TestHello.java"],
+    deps = [
+        "//examples/java-native/src/main/java/com/example/myproject:hello-lib",
+        "//third_party:junit4",
+    ],
+)
+
+java_test(
+    name = "custom",
+    srcs = ["TestCustomGreeting.java"],
+    deps = [
+        "//examples/java-native/src/main/java/com/example/myproject:custom-greeting",
+        "//third_party:junit4",
+    ],
+)
+
+java_test(
+    name = "fail",
+    srcs = ["Fail.java"],
+    deps = ["//third_party:junit4"],
+)
+
+# This attempts to run TestCustomGreeting.java without any resources, so fails.
+java_test(
+    name = "resource-fail",
+    srcs = glob(["Test*.java"]),
+    deps = [
+        "//examples/java-native/src/main/java/com/example/myproject:hello-lib",
+        "//third_party:junit4",
+    ],
+)
diff --git a/examples/java-native/src/test/java/com/example/myproject/Fail.java b/examples/java-native/src/test/java/com/example/myproject/Fail.java
new file mode 100644
index 0000000000..7b947c6e96
--- /dev/null
+++ b/examples/java-native/src/test/java/com/example/myproject/Fail.java
@@ -0,0 +1,14 @@
+package com.example.myproject;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * A test that always fails.
+ */
+public class Fail {
+  @Test
+  public void testFail() {
+    Assert.fail("This is an expected test failure.");
+  }
+}
diff --git a/examples/java-native/src/test/java/com/example/myproject/TestCustomGreeting.java b/examples/java-native/src/test/java/com/example/myproject/TestCustomGreeting.java
new file mode 100644
index 0000000000..f14b7d234a
--- /dev/null
+++ b/examples/java-native/src/test/java/com/example/myproject/TestCustomGreeting.java
@@ -0,0 +1,32 @@
+package com.example.myproject;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import java.nio.charset.StandardCharsets;
+
+/**
+ * Tests using a resource file to replace "Hello" in the output.
+ */
+public class TestCustomGreeting {
+
+  @Test
+  public void testNoArgument() throws Exception {
+    ByteArrayOutputStream out = new ByteArrayOutputStream();
+    Greeter.out = new PrintStream(out);
+    Greeter.main();
+    assertEquals("Bye world\n", new String(out.toByteArray(), StandardCharsets.UTF_8));
+  }
+
+  @Test
+  public void testWithArgument() throws Exception {
+    ByteArrayOutputStream out = new ByteArrayOutputStream();
+    Greeter.out = new PrintStream(out);
+    Greeter.main("toto");
+    assertEquals("Bye toto\n", new String(out.toByteArray(), StandardCharsets.UTF_8));
+  }
+
+}
diff --git a/examples/java-native/src/test/java/com/example/myproject/TestHello.java b/examples/java-native/src/test/java/com/example/myproject/TestHello.java
new file mode 100644
index 0000000000..d50e6e503f
--- /dev/null
+++ b/examples/java-native/src/test/java/com/example/myproject/TestHello.java
@@ -0,0 +1,35 @@
+package com.example.myproject;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import java.nio.charset.StandardCharsets;
+
+/**
+ * Tests different numbers of arguments to main().
+ *
+ * <p>With an empty args array, {@link Greeter} should print "Hello world". If there are one or more
+ * args, {@link Greeter} should print "Hello &lt;arg[0]&gt;".</p>
+ */
+public class TestHello {
+
+  @Test
+  public void testNoArgument() throws Exception {
+    ByteArrayOutputStream out = new ByteArrayOutputStream();
+    Greeter.out = new PrintStream(out);
+    Greeter.main();
+    assertEquals("Hello world\n", new String(out.toByteArray(), StandardCharsets.UTF_8));
+  }
+
+  @Test
+  public void testWithArgument() throws Exception {
+    ByteArrayOutputStream out = new ByteArrayOutputStream();
+    Greeter.out = new PrintStream(out);
+    Greeter.main("toto");
+    assertEquals("Hello toto\n", new String(out.toByteArray(), StandardCharsets.UTF_8));
+  }
+
+}