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Pax Wicket Service is an OSGi extension of the Wicket framework, allowing for dynamic loading and unloading of Wicket components and pageSources.
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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.wicket.util.tester;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

import junit.framework.Assert;

import org.apache.wicket.Component;
import org.apache.wicket.IClusterable;
import org.apache.wicket.Page;
import org.apache.wicket.Component.IVisitor;
import org.apache.wicket.util.string.Strings;

/**
 * A WicketTester-specific helper class.
 * 
 * @author Ingram Chen
 * @since 1.2.6
 */
public class WicketTesterHelper
{
	/**
	 * ComponentData class.
	 * 
	 * @author Ingram Chen
	 * @since 1.2.6
	 */
	public static class ComponentData implements IClusterable
	{
		private static final long serialVersionUID = 1L;

		/** Component path. */
		public String path;

		/** Component type. */
		public String type;

		/** Component value. */
		public String value;
	}

	/**
	 * Gets recursively all Components of a given Page, extracts the
	 * information relevant to us, and adds them to a List.
	 * 
	 * @param page
	 *            the Page to analyze
	 * @return a List of Component data objects
	 */
	public static List getComponentData(final Page page)
	{
		final List data = new ArrayList();

		if (page != null)
		{
			page.visitChildren(new IVisitor()
			{
				public Object component(final Component component)
				{
					final ComponentData object = new ComponentData();

					// anonymous class? Get the parent's class name
					String name = component.getClass().getName();
					if (name.indexOf("$") > 0)
					{
						name = component.getClass().getSuperclass().getName();
					}

					// remove the path component
					name = Strings.lastPathComponent(name, Component.PATH_SEPARATOR);

					object.path = component.getPageRelativePath();
					object.type = name;
					try
					{
						object.value = component.getDefaultModelObjectAsString();
					}
					catch (Exception e)
					{
						object.value = e.getMessage();
					}

					data.add(object);
					return IVisitor.CONTINUE_TRAVERSAL;
				}
			});
		}
		return data;
	}

	/**
	 * Asserts that both Collections contain the same elements.
	 * 
	 * @param expects
	 *            a Collection object
	 * @param actuals
	 *            a Collection object
	 */
	public static void assertEquals(final Collection expects, final Collection actuals)
	{
		if ((actuals.size() != expects.size()) || !expects.containsAll(actuals) ||
			!actuals.containsAll(expects))
		{
			failWithVerboseMessage(expects, actuals);
		}
	}

	/**
	 * Fails with a verbose error message.
	 * 
	 * @param expects
	 *            a Collection object
	 * @param actuals
	 *            a Collection object
	 */
	public static void failWithVerboseMessage(final Collection expects,
		final Collection actuals)
	{
		Assert.fail("\nexpect (" + expects.size() + "):\n" + asLined(expects) + "\nbut was (" +
			actuals.size() + "):\n" + asLined(actuals));
	}

	/**
	 * A toString method for the given Collection.
	 * 
	 * @param objects
	 *            a Collection object
	 * @return a String representation of the Collection
	 */
	public static String asLined(final Collection objects)
	{
		StringBuffer lined = new StringBuffer();
		for (Iterator iter = objects.iterator(); iter.hasNext();)
		{
			String objectString = iter.next().toString();
			lined.append("   ");
			lined.append(objectString);
			if (iter.hasNext())
			{
				lined.append("\n");
			}
		}
		return lined.toString();
	}
}