From 9b2fc22cc07ebebe66e6931d0f49925d0483cff0 Mon Sep 17 00:00:00 2001
From: Robert von Burg <eitch@eitchnet.ch>
Date: Tue, 21 Mar 2017 15:33:06 +0100
Subject: [PATCH] [New] Added new ElementDateVisitor and ElementStateVisitor

These allow to get the date or state respectively from a
StrolchRootElement which supports such a field (Order and/or Activity)
and thus eliminates the need for casting
---
 .../model/visitor/ElementDateVisitor.java     | 43 +++++++++++++++++++
 .../model/visitor/ElementStateVisitor.java    | 42 ++++++++++++++++++
 2 files changed, 85 insertions(+)
 create mode 100644 li.strolch.model/src/main/java/li/strolch/model/visitor/ElementDateVisitor.java
 create mode 100644 li.strolch.model/src/main/java/li/strolch/model/visitor/ElementStateVisitor.java

diff --git a/li.strolch.model/src/main/java/li/strolch/model/visitor/ElementDateVisitor.java b/li.strolch.model/src/main/java/li/strolch/model/visitor/ElementDateVisitor.java
new file mode 100644
index 000000000..8a410d2e2
--- /dev/null
+++ b/li.strolch.model/src/main/java/li/strolch/model/visitor/ElementDateVisitor.java
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2013 Robert von Burg <eitch@eitchnet.ch>
+ * 
+ * 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 li.strolch.model.visitor;
+
+import java.util.Date;
+
+import li.strolch.model.Order;
+import li.strolch.model.Resource;
+import li.strolch.model.activity.Activity;
+
+/**
+ * @author Robert von Burg <eitch@eitchnet.ch>
+ */
+public class ElementDateVisitor implements StrolchRootElementVisitor<Date> {
+
+	@Override
+	public Date visitOrder(Order order) {
+		return order.getDate();
+	}
+
+	@Override
+	public Date visitResource(Resource resource) {
+		throw new IllegalArgumentException("Resources have no date!");
+	}
+
+	@Override
+	public Date visitActivity(Activity activity) {
+		throw new IllegalArgumentException("Activities have no date!");
+	}
+}
diff --git a/li.strolch.model/src/main/java/li/strolch/model/visitor/ElementStateVisitor.java b/li.strolch.model/src/main/java/li/strolch/model/visitor/ElementStateVisitor.java
new file mode 100644
index 000000000..561dfcef1
--- /dev/null
+++ b/li.strolch.model/src/main/java/li/strolch/model/visitor/ElementStateVisitor.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2013 Robert von Burg <eitch@eitchnet.ch>
+ * 
+ * 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 li.strolch.model.visitor;
+
+import li.strolch.model.Order;
+import li.strolch.model.Resource;
+import li.strolch.model.State;
+import li.strolch.model.activity.Activity;
+
+/**
+ * @author Robert von Burg <eitch@eitchnet.ch>
+ */
+public class ElementStateVisitor implements StrolchRootElementVisitor<State> {
+
+	@Override
+	public State visitOrder(Order order) {
+		return order.getState();
+	}
+
+	@Override
+	public State visitResource(Resource resource) {
+		throw new IllegalArgumentException("Resources have no state!");
+	}
+
+	@Override
+	public State visitActivity(Activity activity) {
+		return activity.getState();
+	}
+}