[New] Created ListParameter interface

ListParameter contains methods to handle single values for parameters of
lists of values and also is a marker interface for list parameters.

StringListParameter is the first implementation

src/main/java/li/strolch/model/parameter/ListParameter.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2012, Robert von Burg
+ *
+ * All rights reserved.
+ *
+ * This file is part of the XXX.
+ *
+ *  XXX is free software: you can redistribute 
+ *  it and/or modify it under the terms of the GNU General Public License as 
+ *  published by the Free Software Foundation, either version 3 of the License, 
+ *  or (at your option) any later version.
+ *
+ *  XXX is distributed in the hope that it will 
+ *  be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with XXX.  If not, see 
+ *  <http://www.gnu.org/licenses/>.
+ */
+package li.strolch.model.parameter;
+
+import java.util.List;
+
+import li.strolch.model.Parameter;
+
+/**
+ * @author Robert von Burg <eitch@eitchnet.ch>
+ * 
+ */
+public interface ListParameter<E> extends Parameter<List<E>> {
+
+	/**
+	 * Adds a single value to the {@link List} of values
+	 * 
+	 * @param value
+	 *            the value to add
+	 */
+	public abstract void addValue(E value);
+
+	/**
+	 * Removes a single value from the {@link List} of values
+	 * 
+	 * @param value
+	 *            the value to remove
+	 * 
+	 * @return true if the value was removed, false if it did not exist
+	 */
+	public abstract boolean removeValue(E value);
+}

src/main/java/li/strolch/model/parameter/StringListParameter.java

@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2012, Robert von Burg
+ *
+ * All rights reserved.
+ *
+ * This file is part of the li.strolch.model.
+ *
+ *  li.strolch.model is free software: you can redistribute 
+ *  it and/or modify it under the terms of the GNU General Public License as 
+ *  published by the Free Software Foundation, either version 3 of the License, 
+ *  or (at your option) any later version.
+ *
+ *  li.strolch.model is distributed in the hope that it will 
+ *  be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with li.strolch.model.  If not, see 
+ *  <http://www.gnu.org/licenses/>.
+ */
+package li.strolch.model.parameter;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+import li.strolch.model.StrolchElement;
+
+/**
+ * @author Robert von Burg <eitch@eitchnet.ch>
+ */
+public class StringListParameter extends AbstractParameter<List<String>> implements ListParameter<String> {
+
+	public static final String TYPE = "StringList";
+	private static final long serialVersionUID = 1L;
+
+	protected List<String> value;
+
+	@Override
+	public String getValueAsString() {
+		if (this.value.isEmpty())
+			return "";
+
+		StringBuilder sb = new StringBuilder();
+		Iterator<String> iter = this.value.iterator();
+		while (iter.hasNext()) {
+
+			sb.append(iter.next());
+
+			if (iter.hasNext())
+				sb.append(";");
+		}
+
+		return sb.toString();
+	}
+
+	@Override
+	public List<String> getValue() {
+		return new ArrayList<String>(this.value);
+	}
+
+	@Override
+	public void setValue(List<String> value) {
+		this.value.clear();
+		this.value.addAll(value);
+	}
+
+	@Override
+	public void addValue(String value) {
+		this.value.add(value);
+	}
+
+	@Override
+	public boolean removeValue(String value) {
+		return this.value.remove(value);
+	}
+
+	@Override
+	public String getType() {
+		return TYPE;
+	}
+
+	@Override
+	public StrolchElement getClone() {
+		StringListParameter clone = new StringListParameter();
+
+		super.fillClone(clone);
+
+		clone.setValue(this.value);
+
+		return clone;
+	}
+}