| /* |
| * 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.settings.impl; |
| |
| 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.UUID; |
| |
| public class SlingIdUtil { |
| |
| /** |
| * The length in bytes of a sling identifier |
| */ |
| private static final int SLING_ID_LENGTH = 36; |
| |
| public static String createSlingId() { |
| return UUID.randomUUID().toString(); |
| } |
| |
| /** |
| * Read the id from a file. |
| */ |
| public static String readSlingId(final File idFile) throws IOException { |
| if (idFile.exists() && idFile.length() >= SLING_ID_LENGTH) { |
| DataInputStream dis = null; |
| try { |
| final byte[] rawBytes = new byte[SLING_ID_LENGTH]; |
| dis = new DataInputStream(new FileInputStream(idFile)); |
| dis.readFully(rawBytes); |
| final String rawString = new String(rawBytes, "ISO-8859-1"); |
| |
| // roundtrip to ensure correct format of UUID value |
| return UUID.fromString(rawString).toString(); |
| } finally { |
| if (dis != null) { |
| try { |
| dis.close(); |
| } catch (IOException ignore) { |
| } |
| } |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Write the sling id file. |
| */ |
| public static void writeSlingId(final File idFile, final String id) throws IOException { |
| idFile.delete(); |
| idFile.getParentFile().mkdirs(); |
| DataOutputStream dos = null; |
| try { |
| final byte[] rawBytes = id.getBytes("ISO-8859-1"); |
| dos = new DataOutputStream(new FileOutputStream(idFile)); |
| dos.write(rawBytes, 0, rawBytes.length); |
| dos.flush(); |
| } finally { |
| if (dos != null) { |
| try { |
| dos.close(); |
| } catch (IOException ignore) { |
| } |
| } |
| } |
| } |
| |
| } |