add history file name example

samples/helloworld/src/main/java/org/springframework/shell/samples/helloworld/HelloWorldPlugin.java

@@ -1,12 +0,0 @@
-package org.springframework.shell.samples.helloworld;
-
-import org.springframework.context.annotation.ComponentScan;
-import org.springframework.context.annotation.Configuration;
-
-@Configuration
-@ComponentScan({"org.springframework.shell.samples.helloworld.commands"})
-public class HelloWorldPlugin {
-	
-
-	
-}

samples/helloworld/src/main/java/org/springframework/shell/samples/helloworld/commands/MyHistoryFileProvider.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2011-2012 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.shell.samples.helloworld.commands;
+
+import org.springframework.shell.plugin.HistoryFileProvider;
+import org.springframework.stereotype.Component;
+
+/**
+ * 
+ * @author Jarred Li
+ *
+ */
+@Component
+public class MyHistoryFileProvider implements HistoryFileProvider {
+
+	public int getOrder() {
+		return 1;
+	}
+
+	public String getHistoryFileName() {
+		return "my.log";
+	}
+
+}