[New] Implemented param null selector and ParameterBagSelector

src/main/java/li/strolch/model/query/OrderSelectionVisitor.java

@@ -19,7 +19,7 @@ package li.strolch.model.query;
  * @author Robert von Burg <eitch@eitchnet.ch>
  *
  */
-public interface OrderSelectionVisitor extends StrolchElementSelectionVisitor {
+public interface OrderSelectionVisitor extends StrolchRootElementSelectionVisitor {
 
 	public void visit(DateSelection selection);
 

src/main/java/li/strolch/model/query/ParameterBagSelection.java

@@ -0,0 +1,70 @@
+/*
+ * 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.query;
+
+/**
+ * @author Robert von Burg <eitch@eitchnet.ch>
+ */
+public class ParameterBagSelection implements Selection {
+
+	private String bagKey;
+
+	public ParameterBagSelection(String bagKey) {
+		this.bagKey = bagKey;
+	}
+
+	/**
+	 * @return the bagKey
+	 */
+	public String getBagKey() {
+		return this.bagKey;
+	}
+
+	@Override
+	public boolean hasSelection() {
+		return true;
+	}
+
+	@Override
+	public void accept(QueryVisitor visitor) {
+		accept((StrolchRootElementSelectionVisitor) visitor);
+	}
+
+	public void accept(StrolchRootElementSelectionVisitor visitor) {
+		visitor.visit(this);
+	}
+
+	@SuppressWarnings("nls")
+	@Override
+	public String toString() {
+		StringBuilder builder = new StringBuilder();
+		builder.append(getClass().getSimpleName() + " [bagKey=");
+		builder.append(this.bagKey);
+		builder.append("]");
+		return builder.toString();
+	}
+
+	public static class NullParameterBagSelection extends ParameterBagSelection {
+
+		public NullParameterBagSelection(String bagKey) {
+			super(bagKey);
+		}
+
+		public void accept(StrolchRootElementSelectionVisitor visitor) {
+			visitor.visit(this);
+		}
+	}
+}

src/main/java/li/strolch/model/query/ParameterSelection.java

@@ -105,6 +105,22 @@ public abstract class ParameterSelection implements Selection {
 		return new StringListParameterSelection(bagKey, paramKey, value);
 	}
 
+	public static NullParameterSelection nullSelection(String bagKey, String paramKey) {
+		return new NullParameterSelection(bagKey, paramKey);
+	}
+
+	public static class NullParameterSelection extends ParameterSelection {
+
+		public NullParameterSelection(String bagKey, String paramKey) {
+			super(bagKey, paramKey);
+		}
+
+		@Override
+		public void accept(ParameterSelectionVisitor visitor) {
+			visitor.visit(this);
+		}
+	}
+
 	public static class StringParameterSelection extends ParameterSelection {
 
 		private StringMatchMode matchMode;

src/main/java/li/strolch/model/query/ParameterSelectionVisitor.java

@@ -21,6 +21,7 @@ import li.strolch.model.query.ParameterSelection.DateRangeParameterSelection;
 import li.strolch.model.query.ParameterSelection.FloatParameterSelection;
 import li.strolch.model.query.ParameterSelection.IntegerParameterSelection;
 import li.strolch.model.query.ParameterSelection.LongParameterSelection;
+import li.strolch.model.query.ParameterSelection.NullParameterSelection;
 import li.strolch.model.query.ParameterSelection.StringListParameterSelection;
 import li.strolch.model.query.ParameterSelection.StringParameterSelection;
 
@@ -40,8 +41,10 @@ public interface ParameterSelectionVisitor extends QueryVisitor {
 	public void visit(FloatParameterSelection selection);
 
 	public void visit(DateParameterSelection selection);
-	
+
 	public void visit(DateRangeParameterSelection selection);
 
 	public void visit(StringListParameterSelection selection);
+
+	public void visit(NullParameterSelection nullParameterSelection);
 }

src/main/java/li/strolch/model/query/ResourceQueryVisitor.java

@@ -17,9 +17,8 @@ package li.strolch.model.query;
 
 /**
  * @author Robert von Burg <eitch@eitchnet.ch>
- *
  */
-public interface ResourceQueryVisitor extends StrolchElementSelectionVisitor, ParameterSelectionVisitor {
+public interface ResourceQueryVisitor extends StrolchRootElementSelectionVisitor, ParameterSelectionVisitor {
 
 	// marker interface
 }

src/main/java/li/strolch/model/query/StrolchRootElementSelectionVisitor.java

@@ -0,0 +1,28 @@
+/*
+ * 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.query;
+
+import li.strolch.model.query.ParameterBagSelection.NullParameterBagSelection;
+
+/**
+ * @author Robert von Burg <eitch@eitchnet.ch>
+ */
+public interface StrolchRootElementSelectionVisitor extends StrolchElementSelectionVisitor {
+
+	public void visit(ParameterBagSelection selection);
+
+	public void visit(NullParameterBagSelection selection);
+}