| // Copyright 2013 Google Inc. All Rights Reserved. |
| // |
| // Licensed 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 com.google.enterprise.adaptor; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.URL; |
| import java.net.URLConnection; |
| import java.nio.charset.Charset; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| /** Acquires and provides GSA's version. */ |
| final class GsaVersion { |
| private static final Logger log |
| = Logger.getLogger(GsaVersion.class.getName()); |
| private static final Charset charset = Charset.forName("UTF-8"); |
| |
| private String ver; // example: 7.2.1-1 |
| private int parts[] = new int[4]; |
| |
| private static final Pattern VERSION_FORMAT |
| = Pattern.compile("^(\\d+)\\.(\\d+)\\.(\\d+)\\-(\\d+)$"); |
| |
| GsaVersion(String version) { |
| ver = version; |
| Matcher m = VERSION_FORMAT.matcher(ver); |
| if (!m.matches()) { |
| throw new IllegalArgumentException("not to format: " + ver); |
| } |
| parts[0] = Integer.parseInt(m.group(1)); |
| parts[1] = Integer.parseInt(m.group(2)); |
| parts[2] = Integer.parseInt(m.group(3)); |
| parts[3] = Integer.parseInt(m.group(4)); |
| } |
| |
| /* Requsts entire detailed version string and returns it. */ |
| static GsaVersion get(String host, boolean securely) throws IOException { |
| String protocol = securely ? "https" : "http"; |
| URL url = new URL(protocol, host, "/sw_version.txt"); |
| log.log(Level.FINE, "about to ask GSA for {0}", url); |
| URLConnection conn = url.openConnection(); |
| InputStream in = conn.getInputStream(); |
| String ver = IOHelper.readInputStreamToString(in, charset); |
| ver = ver.replaceAll("\\s",""); |
| return new GsaVersion(ver); |
| } |
| |
| /** Provides entire version string gotten from GSA, eg. 7.2.1-1 */ |
| @Override |
| public String toString() { |
| return ver; |
| } |
| |
| public boolean isAtLeast(String minimum) { |
| GsaVersion min = new GsaVersion(minimum); |
| for (int i = 0; i < parts.length; i++) { |
| if (parts[i] < min.parts[i]) { |
| return false; |
| } |
| if (parts[i] > min.parts[i]) { |
| return true; |
| } |
| // parts[i] == min.parts[i] are equal |
| } |
| return true; // all parts were the same |
| } |
| } |