htlblog/src/main/java/org/apache/sling/samples/htlblog/models/List.java

/*
 * 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.sling.samples.htlblog.models;

import java.util.Iterator;

import org.apache.commons.collections.IteratorUtils;
import org.apache.commons.collections.iterators.ReverseListIterator;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.resource.ResourceResolver;
import org.apache.sling.api.resource.ResourceUtil;
import org.apache.sling.models.annotations.Model;

/**
 * The Class List.
 * 
 * <p>This class is specifically used public posts. 
 * It should not be used for listing other types of content.</p>
 */
@Model(adaptables=SlingHttpServletRequest.class)
public class List {

    /** The parent resource that holds our posts. */
    private final Resource resource;

    /**
     * Instantiates a new list model.
     * 
     * @param request the request
     */
    public List(final SlingHttpServletRequest request) {
        ResourceResolver resourceResolver = request.getResourceResolver();
        this.resource = resourceResolver.getResource("/content/htlblog/posts");
    }

    /**
     * Gets the children.
     * 
     * <p>Get the children, convert them to a Java List, reverse them, 
     * and adapt the collection to a Post model</p>
     * 
     * @return the children
     */
    @SuppressWarnings("unchecked")
    public Iterator<Post> getChildren() {
        if(this.resource != null) {
            java.util.List<Resource> childrenList = IteratorUtils.toList(this.resource.getChildren().iterator());
            Iterator<Resource> reverseChildren = new ReverseListIterator(childrenList);
            return ResourceUtil.adaptTo(reverseChildren, Post.class);
        } else {
            return null;
        }
    }
}