Use JCommander resolver in combination with others.

Prepare for implementation of describe()

spring-shell2-samples/src/main/java/org/springframework/shell2/samples/jcommander/Args.java

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+/*
+ * 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
+ *
+ *      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 org.springframework.shell2.samples.jcommander;
+
+import java.util.ArrayList;
+import java.util.List;
+
+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<>();
+
+	@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-shell2-samples/src/main/java/org/springframework/shell2/samples/jcommander/JCommanderCommands.java

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+/*
+ * 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
+ *
+ *      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 org.springframework.shell2.samples.jcommander;
+
+import org.springframework.shell2.standard.ShellComponent;
+import org.springframework.shell2.standard.ShellMethod;
+import org.springframework.shell2.standard.ShellOption;
+
+/**
+ * A class with JCommander commands.
+ *
+ * @author Eric Bottard
+ */
+@ShellComponent
+public class JCommanderCommands {
+
+	@ShellMethod(help = "bind parameters to JCommander POJO")
+	public String jcommander(@ShellOption(optOut = true) Args args) {
+		return "You said " + args;
+	}
+}