Simple Bukkit Book API

/*
 * Copyright (C) 2012  Joshua Reetz

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import net.minecraft.server.NBTTagCompound;
import net.minecraft.server.NBTTagList;
import net.minecraft.server.NBTTagString;

import org.bukkit.craftbukkit.inventory.CraftItemStack;

public class BookItem {

    private net.minecraft.server.ItemStack item = null;
    private CraftItemStack stack = null;

    public BookItem(org.bukkit.inventory.ItemStack item) {
        if(item instanceof CraftItemStack) {
            stack = (CraftItemStack)item;
            this.item = stack.getHandle();
        }else if(item instanceof org.bukkit.inventory.ItemStack) {
            stack = new CraftItemStack(item);
            this.item = stack.getHandle();
        }
    }

    public String[] getPages() {
        NBTTagCompound tags = item.getTag();
        if(tags == null) {
            return null;
        }
        NBTTagList pages = tags.getList("pages");
        String[] pagestrings = new String[pages.size()];
        for(int i = 0; i < pages.size(); i++) {
            pagestrings[i] = pages.get(i).toString();
        }
        return pagestrings;
    }

    public String getAuthor() {
        NBTTagCompound tags = item.getTag();
        if(tags == null) {
            return null;
        }
        String author = tags.getString("author");
        return author;
    }

    public String getTitle() {
        NBTTagCompound tags = item.getTag();
        if(tags == null) {
            return null;
        }
        String title = tags.getString("title");
        return title;
    }

    public void setPages(String[] newpages) {
        NBTTagCompound tags = item.tag;
        if (tags == null) {
            tags = item.tag = new NBTTagCompound();
        }
        NBTTagList pages = new NBTTagList("pages");
        //we don't want to throw any errors if the book is blank!
        if(newpages.length == 0) {
            pages.add(new NBTTagString("1", ""));
        }else {
            for(int i = 0; i < newpages.length; i++) {
                pages.add(new NBTTagString("" + i + "", newpages[i]));
            }
        }
        tags.set("pages", pages);
    }

    public void addPages(String[] newpages) {
        NBTTagCompound tags = item.tag;
        if (tags == null) {
            tags = item.tag = new NBTTagCompound();
        }
        NBTTagList pages;
        if(getPages() == null) {
            pages = new NBTTagList("pages");
        }else {
            pages = tags.getList("pages");
        }
        //we don't want to throw any errors if the book is blank!
        if(newpages.length == 0 && pages.size() == 0) {
            pages.add(new NBTTagString("1", ""));
        }else {
            for(int i = 0; i < newpages.length; i++) {
                pages.add(new NBTTagString("" + pages.size() + "", newpages[i]));
            }
        }
        tags.set("pages", pages);
    }

    public void setAuthor(String author) {
        NBTTagCompound tags = item.tag;
        if (tags == null) {
            tags = item.tag = new NBTTagCompound();
        }
        if(author != null && !author.equals("")) {
            tags.setString("author", author);
        }
    }

    public void setTitle(String title) {
        NBTTagCompound tags = item.tag;
        if (tags == null) {
            tags = item.tag = new NBTTagCompound();
        }
        if(title != null && !title.equals("")) {
            tags.setString("title", title);
        }
    }

    public org.bukkit.inventory.ItemStack getItemStack() {
        return stack;
    }

}