Allow non public methods for @CliAvailabilityIndicator

Fixes https://github.com/spring-projects/spring-shell/issues/122

src/main/java/org/springframework/shell/core/SimpleParser.java

@@ -41,6 +41,7 @@ import org.springframework.shell.support.util.ExceptionUtils;
 import org.springframework.shell.support.util.NaturalOrderComparator;
 import org.springframework.shell.support.util.OsUtils;
 import org.springframework.util.Assert;
+import org.springframework.util.ReflectionUtils;
 import org.springframework.util.StringUtils;
 
 /**
@@ -1086,7 +1087,7 @@ public class SimpleParser implements Parser {
 	public final void add(final CommandMarker command) {
 		synchronized (mutex) {
 			commands.add(command);
-			for (final Method method : command.getClass().getMethods()) {
+			for (final Method method : ReflectionUtils.getAllDeclaredMethods(command.getClass())) {
 				CliAvailabilityIndicator availability = method.getAnnotation(CliAvailabilityIndicator.class);
 				if (availability != null) {
 					Assert.isTrue(
@@ -1100,6 +1101,7 @@ public class SimpleParser implements Parser {
 					for (String cmd : availability.value()) {
 						Assert.isTrue(!availabilityIndicators.containsKey(cmd),
 								"Cannot specify an availability indicator for '" + cmd + "' more than once");
+						ReflectionUtils.makeAccessible(method);
 						availabilityIndicators.put(cmd, new MethodTarget(method, command));
 					}
 				}

src/test/java/org/springframework/shell/core/SimpleParserTests.java

@@ -31,6 +31,7 @@ import org.junit.Assert;
 import org.junit.Test;
 
 import org.springframework.shell.converters.StringConverter;
+import org.springframework.shell.core.annotation.CliAvailabilityIndicator;
 import org.springframework.shell.core.annotation.CliCommand;
 import org.springframework.shell.core.annotation.CliOption;
 import org.springframework.shell.event.ParseResult;
@@ -462,6 +463,19 @@ public class SimpleParserTests {
 		assertThat(result, nullValue());
 	}
 
+	@Test
+	public void testAvailabilityIndicator() {
+		MyCommands commands = new MyCommands();
+		parser.add(commands);
+		ParseResult result = parser.parse("foo");
+		assertThat(result, notNullValue());
+
+		commands.fooIsAvailable = false;
+		result = parser.parse("foo");
+		assertThat(result, nullValue());
+
+	}
+
 	/**
 	 * Return a matcher that asserts that a completion, when added to {@link #buffer} at the given {@link #offset},
 	 * indeed matches the provided matcher.
@@ -490,6 +504,14 @@ public class SimpleParserTests {
 
 	public static class MyCommands implements CommandMarker {
 
+		boolean fooIsAvailable = true;
+
+		@CliAvailabilityIndicator("foo")
+		/*package private. see gh-122*/boolean isFooAvailable() {
+			System.out.println("Returning " + fooIsAvailable);
+			return fooIsAvailable;
+		}
+
 		@CliCommand("foo")
 		public void foo() {