Native support for JCommander

- Fixes #340

spring-shell-samples/src/main/java/org/springframework/shell/samples/jcommander/Args.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2017 the original author or 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
+ *
+ *      https://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 org.springframework.shell.samples.jcommander;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.validation.constraints.Min;
+
+import com.beust.jcommander.Parameter;
+
+/**
+ * An example straight from the JCommander documentation.
+ *
+ * @author Eric Bottard
+ * @author Cédric Beust
+ */
+public class Args {
+
+	@Parameter
+	private List<String> parameters = new ArrayList<>();
+
+	@Min(3)
+	@Parameter(names = { "-log", "-verbose" }, description = "Level of verbosity")
+	private Integer verbose = 1;
+
+	@Parameter(names = "-groups", description = "Comma-separated list of group names to be run")
+	private String groups;
+
+	@Parameter(names = "-debug", description = "Debug mode")
+	private boolean debug = false;
+
+	@Override
+	public String toString() {
+		return "Args{" +
+			"parameters=" + parameters +
+			", verbose=" + verbose +
+			", groups='" + groups + '\'' +
+			", debug=" + debug +
+			'}';
+	}
+}

spring-shell-samples/src/main/java/org/springframework/shell/samples/jcommander/JCommanderCommands.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2017 the original author or 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
+ *
+ *      https://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 org.springframework.shell.samples.jcommander;
+
+import org.springframework.shell.standard.ShellComponent;
+import org.springframework.shell.standard.ShellMethod;
+import org.springframework.shell.standard.ShellOption;
+
+import javax.validation.Valid;
+
+/**
+ * A class with JCommander commands.
+ *
+ * @author Eric Bottard
+ */
+@ShellComponent
+public class JCommanderCommands {
+
+	@ShellMethod("Bind parameters to JCommander POJO.")
+	public String jcommander(@ShellOption(optOut = true) @Valid Args args) {
+		return "You said " + args;
+	}
+}

spring-shell-samples/src/main/resources/META-INF/native-image/reflect-config.json

@@ -0,0 +1,9 @@
+[
+  {
+    "name":"org.springframework.shell.samples.jcommander.Args",
+    "allDeclaredFields":true,
+    "queryAllDeclaredMethods":true,
+    "queryAllDeclaredConstructors":true,
+    "methods":[{"name":"<init>","parameterTypes":[] }]
+  }
+]