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Backup.java
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Backup.java
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/*
* Copyright 2011 Tyler Blair. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and contributors and should not be interpreted as representing official policies,
* either expressed or implied, of anybody else.
*/
package com.griefcraft.io;
import org.bukkit.inventory.ItemStack;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.EnumSet;
import java.util.Map;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
public class Backup {
/**
* The backup file's current revision
*/
public static final int CURRENT_REVISION = 1;
/**
* The operations the backup is allowed to perform
*/
public enum OperationMode {
READ, WRITE
}
/**
* The file this backup is located at
*/
private final File file;
/**
* The operationMode we are allowed to perform
*/
private final OperationMode operationMode;
/**
* The flags we are using
*/
private final EnumSet<BackupManager.Flag> flags;
/**
* This backup's revision number
*/
private int revision;
/**
* The time the backup was created it
*/
private long created;
/**
* The backup's input stream if we are reading
*/
private DataInputStream inputStream;
/**
* The backup's output stream if we are writing
*/
private DataOutputStream outputStream;
public Backup(File file, OperationMode operationMode, EnumSet<BackupManager.Flag> flags) throws IOException {
this.file = file;
this.operationMode = operationMode;
this.flags = flags;
if (!file.exists()) {
if (operationMode == OperationMode.READ) {
throw new UnsupportedOperationException("The backup could not be read");
} else {
file.createNewFile();
}
}
// Set some base data if we're writing
if (operationMode == OperationMode.WRITE) {
revision = CURRENT_REVISION;
created = System.currentTimeMillis() / 1000;
}
// Are we using compression?
boolean compression = flags.contains(BackupManager.Flag.COMPRESSION);
// create the stream we need
if (operationMode == OperationMode.READ) {
FileInputStream fis = new FileInputStream(file);
inputStream = new DataInputStream(compression ? new GZIPInputStream(fis) : fis);
} else if (operationMode == OperationMode.WRITE) {
FileOutputStream fos = new FileOutputStream(file);
outputStream = new DataOutputStream(compression ? new GZIPOutputStream(fos) : fos);
}
}
/**
* Read an entity from the backup file
*
* @return
*/
protected Restorable readRestorable() throws IOException {
if (operationMode != OperationMode.READ) {
throw new UnsupportedOperationException("READ is not allowed on this backup.");
}
// The object type
int type = (byte) inputStream.read();
// EOF
if (type == -1) {
return null;
}
// TODO enum that shit yo
if (type == 0) { // Protection
RestorableProtection rprotection = new RestorableProtection();
rprotection.setId(inputStream.readInt());
rprotection.setProtectionType(inputStream.readByte());
rprotection.setBlockId(inputStream.readShort());
rprotection.setOwner(inputStream.readUTF());
rprotection.setWorld(inputStream.readUTF());
rprotection.setX(inputStream.readInt());
rprotection.setY(inputStream.readShort());
rprotection.setZ(inputStream.readInt());
rprotection.setData(inputStream.readUTF());
rprotection.setCreated(inputStream.readLong());
rprotection.setUpdated(inputStream.readLong());
return rprotection;
} else if (type == 1) { // Block
RestorableBlock rblock = new RestorableBlock();
rblock.setId(inputStream.readShort());
rblock.setWorld(inputStream.readUTF());
rblock.setX(inputStream.readInt());
rblock.setY(inputStream.readShort());
rblock.setZ(inputStream.readInt());
rblock.setData(inputStream.read() & 0xFF);
int itemCount = inputStream.readShort();
for (int i = 0; i < itemCount; i++) {
// Read in us some RestorableItems
int slot = inputStream.readShort();
int itemId = inputStream.readShort();
int amount = inputStream.readShort();
short damage = inputStream.readShort();
// Create the stack
ItemStack itemStack = new ItemStack(itemId, amount, damage);
// add it to the block
rblock.setSlot(slot, itemStack);
}
// Woo!
return rblock;
}
throw new UnsupportedOperationException("Read unknown type: " + type);
}
/**
* Write an entity to the backup file
*
* @param restorable
*/
protected void writeRestorable(Restorable restorable) throws IOException {
if (operationMode != OperationMode.WRITE) {
throw new UnsupportedOperationException("WRITE is not allowed on this backup.");
}
// write the id
outputStream.write((byte) restorable.getType());
// Write it
if (restorable.getType() == 0) { // Protection, also TODO ENUMSSSSSSSSSSS
RestorableProtection rprotection = (RestorableProtection) restorable;
outputStream.writeInt(rprotection.getId());
outputStream.writeByte(rprotection.getType());
outputStream.writeShort(rprotection.getBlockId());
outputStream.writeUTF(rprotection.getOwner());
outputStream.writeUTF(rprotection.getWorld());
outputStream.writeInt(rprotection.getX());
outputStream.writeShort(rprotection.getY());
outputStream.writeInt(rprotection.getZ());
outputStream.writeUTF(rprotection.getData());
outputStream.writeLong(rprotection.getCreated());
outputStream.writeLong(rprotection.getUpdated());
} else if (restorable.getType() == 1) { // Block, TODO DID I SAY TO DO THE ENUM YET??
RestorableBlock rblock = (RestorableBlock) restorable;
outputStream.writeShort(rblock.getId());
outputStream.writeUTF(rblock.getWorld());
outputStream.writeInt(rblock.getX());
outputStream.writeShort(rblock.getY());
outputStream.writeInt(rblock.getZ());
outputStream.write((byte) rblock.getData());
outputStream.writeShort(rblock.getItems().size());
// Write the items if there are any
for (Map.Entry<Integer, ItemStack> entry : rblock.getItems().entrySet()) {
int slot = entry.getKey();
ItemStack stack = entry.getValue();
outputStream.writeShort(slot);
outputStream.writeShort(stack.getTypeId());
outputStream.writeShort(stack.getAmount());
outputStream.writeShort(stack.getDurability());
}
}
outputStream.flush();
}
/**
* Read the backup's header
*
* @throws IOException
*/
protected void readHeader() throws IOException {
revision = inputStream.readShort();
created = inputStream.readLong();
inputStream.read(new byte[10]); // reserved space
}
/**
* Write the backup's header
*
* @throws IOException
*/
protected void writeHeader() throws IOException {
outputStream.writeShort(revision);
outputStream.writeLong(created);
outputStream.write(new byte[10]); // reserved space
outputStream.flush();
}
/**
* Close the backup file
*
* @throws IOException
*/
protected void close() throws IOException {
if (operationMode == OperationMode.READ) {
inputStream.close();
} else if (operationMode == OperationMode.WRITE) {
outputStream.close();
}
}
}