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Wicket is a Java web application framework that takes simplicity, separation of concerns and ease of development to a whole new level. Wicket pages can be mocked up, previewed and later revised using standard WYSIWYG HTML design tools. Dynamic content processing and form handling is all handled in Java code using a first-class component model backed by POJO data beans that can easily be persisted using your favorite technology.

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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;

import java.util.function.Supplier;

import org.apache.wicket.core.request.mapper.BookmarkableMapper;
import org.apache.wicket.core.request.mapper.BufferedResponseMapper;
import org.apache.wicket.core.request.mapper.HomePageMapper;
import org.apache.wicket.core.request.mapper.PageInstanceMapper;
import org.apache.wicket.core.request.mapper.ResourceReferenceMapper;
import org.apache.wicket.request.IRequestMapper;
import org.apache.wicket.request.component.IRequestablePage;
import org.apache.wicket.request.mapper.CompoundRequestMapper;
import org.apache.wicket.request.mapper.parameter.PageParametersEncoder;
import org.apache.wicket.request.resource.caching.IResourceCachingStrategy;

/**
 * Mapper that encapsulates mappers that are necessary for Wicket to function.
 * 
 * @author igor.vaynberg
 */
public class SystemMapper extends CompoundRequestMapper
{
	private final Application application;

	/**
	 * Constructor
	 * 
	 * @param application
	 */
	public SystemMapper(final Application application)
	{
		this.application = application;

		add(newPageInstanceMapper());
		add(newBookmarkableMapper());
		add(newHomePageMapper(new HomePageProvider(application)));
		add(newResourceReferenceMapper(new PageParametersEncoder(),
			new ParentFolderPlaceholderProvider(application), getResourceCachingStrategy()));
		add(newUrlResourceReferenceMapper());
		add(RestartResponseAtInterceptPageException.MAPPER);
		add(newBufferedResponseMapper());
	}

	protected IRequestMapper newBufferedResponseMapper()
	{
		return new BufferedResponseMapper();
	}

	protected IRequestMapper newUrlResourceReferenceMapper()
	{
		return new UrlResourceReferenceMapper();
	}

	private IRequestMapper newResourceReferenceMapper(PageParametersEncoder pageParametersEncoder,
	                                                  ParentFolderPlaceholderProvider parentFolderPlaceholderProvider,
	                                                  Supplier resourceCachingStrategy)
	{
		return new ResourceReferenceMapper(pageParametersEncoder, parentFolderPlaceholderProvider,resourceCachingStrategy);
	}

	protected IRequestMapper newBookmarkableMapper()
	{
		return new BookmarkableMapper();
	}

	protected IRequestMapper newPageInstanceMapper()
	{
		return new PageInstanceMapper();
	}

	protected IRequestMapper newHomePageMapper(Supplier> homePageProvider)
	{
		return new HomePageMapper(homePageProvider);
	}

	protected Supplier getResourceCachingStrategy()
	{
		return () -> application.getResourceSettings().getCachingStrategy();
	}

	protected static class ParentFolderPlaceholderProvider implements Supplier
	{
		private final Application application;

		protected ParentFolderPlaceholderProvider(Application application)
		{
			this.application = application;
		}

		@Override
		public String get()
		{
			return application.getResourceSettings().getParentFolderPlaceholder();
		}
	}

	protected static class HomePageProvider implements Supplier>
	{
		private final Application application;

		protected HomePageProvider(final Application application)
		{
			this.application = application;
		}

		@Override
		public Class get()
		{
			return (Class) application.getHomePage();
		}
	}
}