org.apache.sling.settings.impl.SlingIdUtil Maven / Gradle / Ivy
/*
* 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) {
}
}
}
}
}