cn.nukkit.item.ItemBookWritable Maven / Gradle / Ivy
package cn.nukkit.item;
import cn.nukkit.nbt.tag.CompoundTag;
import cn.nukkit.nbt.tag.ListTag;
import com.google.common.base.Preconditions;
import java.util.List;
public abstract class ItemBookWritable extends Item {
protected ItemBookWritable(int id) {
super(id);
}
protected ItemBookWritable(int id, Integer meta) {
super(id, meta);
}
protected ItemBookWritable(int id, Integer meta, int count) {
super(id, meta, count);
}
protected ItemBookWritable(int id, Integer meta, int count, String name) {
super(id, meta, count, name);
}
/**
* Returns whether the given page exists in this book.
*/
public boolean pageExists(int pageId) {
Preconditions.checkArgument(pageId >= 0 && pageId < 50, "Page number " + pageId + " is out of range");
if (this.hasCompoundTag()) {
CompoundTag tag = this.getNamedTag();
if (tag.contains("pages") && tag.get("pages") instanceof ListTag) {
return tag.getList("pages", CompoundTag.class).size() > pageId;
}
}
return false;
}
/**
* Returns a string containing the content of a page (which could be empty), or null if the page doesn't exist.
*/
public String getPageText(int pageId) {
Preconditions.checkArgument(pageId >= 0 && pageId < 50, "Page number " + pageId + " is out of range");
if (this.hasCompoundTag()) {
CompoundTag tag = this.getNamedTag();
if (tag.contains("pages") && tag.get("pages") instanceof ListTag) {
ListTag pages = tag.getList("pages", CompoundTag.class);
if (pages.size() > pageId) {
return pages.get(pageId).getString("text");
}
}
}
return null;
}
/**
* Sets the text of a page in the book. Adds the page if the page does not yet exist.
* @return boolean indicating success
*/
public boolean setPageText(int pageId, String pageText) {
Preconditions.checkArgument(pageId >= 0 && pageId < 50, "Page number " + pageId + " is out of range");
Preconditions.checkArgument(pageText.length() <= 256, "Text length " + pageText.length() + " is out of range");
CompoundTag tag;
if (this.hasCompoundTag()) {
tag = this.getNamedTag();
} else if (pageText.isEmpty()) {
return false;
} else {
tag = new CompoundTag();
}
ListTag pages;
if (!tag.contains("pages") || !(tag.get("pages") instanceof ListTag)) {
pages = new ListTag<>("pages");
tag.putList(pages);
} else {
pages = tag.getList("pages", CompoundTag.class);
}
if (pages.size() <= pageId) {
for (int current = pages.size(); current <= pageId; current++) {
pages.add(createPageTag());
}
}
pages.get(pageId).putString("text", pageText);
this.setCompoundTag(tag);
return true;
}
/**
* Adds a new page with the given page ID.
* Creates a new page for every page between the given ID and existing pages that doesn't yet exist.
* @return boolean indicating success
*/
public boolean addPage(int pageId) {
Preconditions.checkArgument(pageId >= 0 && pageId < 50, "Page number " + pageId + " is out of range");
CompoundTag tag = this.hasCompoundTag() ? this.getNamedTag() : new CompoundTag();
ListTag pages;
if (!tag.contains("pages") || !(tag.get("pages") instanceof ListTag)) {
pages = new ListTag<>("pages");
tag.putList(pages);
} else {
pages = tag.getList("pages", CompoundTag.class);
}
for (int current = pages.size(); current <= pageId; current++) {
pages.add(createPageTag());
}
this.setCompoundTag(tag);
return true;
}
/**
* Deletes an existing page with the given page ID.
* @return boolean indicating success
*/
public boolean deletePage(int pageId) {
Preconditions.checkArgument(pageId >= 0 && pageId < 50, "Page number " + pageId + " is out of range");
if (this.hasCompoundTag()) {
CompoundTag tag = this.getNamedTag();
if (tag.contains("pages") && tag.get("pages") instanceof ListTag) {
ListTag pages = tag.getList("pages", CompoundTag.class);
if (pages.size() > pageId) {
pages.remove(pageId);
this.setCompoundTag(tag);
}
}
}
return true;
}
/**
* Inserts a new page with the given text and moves other pages upwards.
* @return boolean indicating success
*/
public boolean insertPage(int pageId) {
return this.insertPage(pageId, "");
}
/**
* Inserts a new page with the given text and moves other pages upwards.
* @return boolean indicating success
*/
public boolean insertPage(int pageId, String pageText) {
Preconditions.checkArgument(pageId >= 0 && pageId < 50, "Page number " + pageId + " is out of range");
Preconditions.checkArgument(pageText.length() <= 256, "Text length " + pageText.length() + " is out of range");
CompoundTag tag = this.hasCompoundTag() ? this.getNamedTag() : new CompoundTag();
ListTag pages;
if (!tag.contains("pages") || !(tag.get("pages") instanceof ListTag)) {
pages = new ListTag<>("pages");
tag.putList(pages);
} else {
pages = tag.getList("pages", CompoundTag.class);
}
if (pages.size() <= pageId) {
for (int current = pages.size(); current <= pageId; current++) {
pages.add(createPageTag());
}
pages.get(pageId).putString("text", pageText);
} else {
pages.add(pageId, createPageTag(pageText));
}
this.setCompoundTag(tag);
return true;
}
/**
* Switches the text of two pages with each other.
* @return boolean indicating success
*/
public boolean swapPages(int pageId1, int pageId2) {
Preconditions.checkArgument(pageId1 >= 0 && pageId1 < 50, "Page number " + pageId1 + " is out of range");
Preconditions.checkArgument(pageId2 >= 0 && pageId2 < 50, "Page number " + pageId2 + " is out of range");
if (this.hasCompoundTag()) {
CompoundTag tag = this.getNamedTag();
if (tag.contains("pages") && tag.get("pages") instanceof ListTag) {
ListTag pages = tag.getList("pages", CompoundTag.class);
if (pages.size() > pageId1 && pages.size() > pageId2) {
String pageContents1 = pages.get(pageId1).getString("text");
String pageContents2 = pages.get(pageId2).getString("text");
pages.get(pageId1).putString("text", pageContents2);
pages.get(pageId2).putString("text", pageContents1);
return true;
}
}
}
return false;
}
/**
* Returns an list containing all pages of this book.
*/
public List getPages() {
CompoundTag tag = this.hasCompoundTag() ? this.getNamedTag() : new CompoundTag();
ListTag pages;
if (!tag.contains("pages") || !(tag.get("pages") instanceof ListTag)) {
pages = new ListTag<>("pages");
tag.putList(pages);
} else {
pages = tag.getList("pages", CompoundTag.class);
}
return pages.parseValue();
}
protected static CompoundTag createPageTag() {
return createPageTag("");
}
protected static CompoundTag createPageTag(String pageText) {
return new CompoundTag()
.putString("text", pageText)
.putString("photoname", "");
}
}
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