pre-wicket.1.2.5/wicket-examples/src/main/java/wicket/examples/displaytag/ExampleSubtotals.java

/*
 * $Id$ $Revision:
 * 5389 $ $Date$
 * 
 * ==================================================================== 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 wicket.examples.displaytag;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import wicket.PageParameters;
import wicket.examples.displaytag.utils.ReportList;
import wicket.examples.displaytag.utils.ReportableListObject;
import wicket.examples.displaytag.utils.SimpleListView;
import wicket.markup.html.basic.Label;
import wicket.markup.html.list.ListItem;
import wicket.markup.html.list.ListView;
import wicket.model.PropertyModel;

/**
 * Table with subtotals calculated and printed into the table on the fly
 * 
 * @author Juergen Donnerstag
 */
public class ExampleSubtotals extends Displaytag
{
	/**
	 * Constructor.
	 * 
	 * @param parameters
	 *            Page parameters
	 */
	public ExampleSubtotals(final PageParameters parameters)
	{
		// Test data
		final ReportList data = new ReportList();
		final Map groups = new LinkedHashMap(); // Keep the insertion order

		// Fill the 'groups' map
		ReportableListObject previousValue = (ReportableListObject)data.get(0);
		groups.put(previousValue.getCity(), new Integer(0));
		int startIdx = 0;
		for (int i = 1; i < data.size(); i++)
		{
			final ReportableListObject value = (ReportableListObject)data.get(i);

			if (!value.getCity().equals(previousValue.getCity()))
			{
				groups.put(previousValue.getCity(), new Integer(i - startIdx));
				groups.put(value.getCity(), new Integer(0));
				previousValue = value;
				startIdx = i;
			}
		}
		groups.put(previousValue.getCity(), new Integer(data.size() - startIdx));

		// add the table
		List groupList = new ArrayList();
		groupList.addAll(groups.keySet());
		add(new ListView("border", groupList)
		{
			private int startIndex = 0;

			public void populateItem(final ListItem listItem)
			{
				SubtotalTable subtable = new SubtotalTable("rows", data);
				subtable.setStartIndex(startIndex);

				String group = listItem.getModelObjectAsString();
				int size = ((Integer)groups.get(group)).intValue();
				subtable.setViewSize(size);
				startIndex += size;

				listItem.add(subtable);
				listItem.add(new Label("name", new PropertyModel(subtable, "group1")));
				listItem.add(new Label("value", new PropertyModel(subtable, "subtotal")));
			}
		});
	}

	/**
	 * A subtotal + grouping table prints the tables rows and adds a bar and the
	 * subtotal at the bottom.
	 */
	private class SubtotalTable extends SimpleListView
	{
		private ReportableListObject previousValue = null;
		private double subtotal = 0;
		private String city;

		/**
		 * Constructor
		 * 
		 * @param id
		 * @param data
		 */
		public SubtotalTable(final String id, final List data)
		{
			super(id, data);
		}

		/**
		 * @return Subtotal
		 */
		public double getSubtotal()
		{
			return subtotal;
		}

		/**
		 * @return Group 1
		 */
		public String getGroup1()
		{
			return city;
		}

		/**
		 * @see wicket.markup.html.list.ListView#populateItem(wicket.markup.html.list.ListItem)
		 */
		public void populateItem(final ListItem listItem)
		{
			final ReportableListObject value = (ReportableListObject)listItem.getModelObject();

			if (previousValue != null)
			{
				listItem.add(new Label("city", ""));

				boolean equal = value.getProject().equals(previousValue.getProject());
				listItem.add(new Label("project", equal ? "" : value.getProject()));
			}

			listItem.add(new Label("hours", Double.toString(value.getAmount())));

			subtotal += value.getAmount();
			previousValue = value;
		}
	}
}