ru.org.linux.comment.CommentList.java Source code

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Here is the source code for ru.org.linux.comment.CommentList.java

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/*
 * Copyright 1998-2015 Linux.org.ru
 *    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 ru.org.linux.comment;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import ru.org.linux.user.Profile;

import javax.annotation.Nonnull;
import java.io.Serializable;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class CommentList implements Serializable {
    private final ImmutableList<Comment> comments;
    private final CommentNode root;
    private final ImmutableMap<Integer, CommentNode> nodeIndex;

    private final long lastmod;

    public CommentList(List<Comment> comments, long lastmod) {
        this.lastmod = lastmod;

        this.comments = ImmutableList.copyOf(comments);

        Map<Integer, CommentNodeBuilder> tempIndex = new HashMap<>(this.comments.size());

        CommentNodeBuilder rootBuilder = new CommentNodeBuilder();

        /* build tree */
        for (Comment comment : this.comments) {
            CommentNodeBuilder node = new CommentNodeBuilder(comment);

            tempIndex.put(comment.getId(), node);

            if (comment.getReplyTo() == 0) {
                rootBuilder.addChild(node);
            } else {
                CommentNodeBuilder parentNode = tempIndex.get(comment.getReplyTo());
                if (parentNode != null) {
                    parentNode.addChild(node);
                } else {
                    rootBuilder.addChild(node);
                }
            }
        }

        root = rootBuilder.build();

        ImmutableMap.Builder<Integer, CommentNode> builder = ImmutableMap.builder();

        buildIndex(builder, root);

        nodeIndex = builder.build();
    }

    private static void buildIndex(ImmutableMap.Builder<Integer, CommentNode> builder, CommentNode root) {
        if (root.getComment() != null) {
            builder.put(root.getComment().getId(), root);
        }

        for (CommentNode child : root.childs()) {
            buildIndex(builder, child);
        }
    }

    @Nonnull
    public ImmutableList<Comment> getList() {
        return comments;
    }

    public CommentNode getRoot() {
        return root;
    }

    public CommentNode getNode(int msgid) {
        return nodeIndex.get(msgid);
    }

    private int getCommentPage(@Nonnull Comment comment, int messages, boolean reverse) {
        int index = comments.indexOf(comment);

        if (reverse) {
            return (comments.size() - index) / messages;
        } else {
            return index / messages;
        }
    }

    public int getCommentPage(@Nonnull Comment comment, @Nonnull Profile profile) {
        int messages = profile.getMessages();
        boolean reverse = profile.isShowNewFirst();

        return getCommentPage(comment, messages, reverse);
    }

    public long getLastmod() {
        return lastmod;
    }
}