1 package org.ibex.nestedvm.util;
7 import java.text.DateFormatSymbols;
9 public abstract class Platform {
11 private static final Platform p;
16 if(getProperty("java.vm.name").equals("SableVM"))
19 version = Float.valueOf(getProperty("java.specification.version")).floatValue();
20 } catch(Exception e) {
21 System.err.println("WARNING: " + e + " while trying to find jvm version - assuming 1.1");
25 if(version >= 1.4f) platformClass = "Jdk14";
26 else if(version >= 1.3f) platformClass = "Jdk13";
27 else if(version >= 1.2f) platformClass = "Jdk12";
28 else if(version >= 1.1f) platformClass = "Jdk11";
29 else throw new Error("JVM Specification version: " + version + " is too old. (see org.ibex.util.Platform to add support)");
32 p = (Platform) Class.forName(Platform.class.getName() + "$" + platformClass).newInstance();
33 } catch(Exception e) {
35 throw new Error("Error instansiating platform class");
39 public static String getProperty(String key) {
41 return System.getProperty(key);
42 } catch(SecurityException e) {
48 abstract boolean _atomicCreateFile(File f) throws IOException;
49 public static boolean atomicCreateFile(File f) throws IOException { return p._atomicCreateFile(f); }
51 abstract void _socketHalfClose(Socket s, boolean output) throws IOException;
52 public static void socketHalfClose(Socket s, boolean output) throws IOException { p._socketHalfClose(s,output); }
54 abstract void _socketSetKeepAlive(Socket s, boolean on) throws SocketException;
55 public static void socketSetKeepAlive(Socket s, boolean on) throws SocketException { p._socketSetKeepAlive(s,on); }
57 abstract InetAddress _inetAddressFromBytes(byte[] a) throws UnknownHostException;
58 public static InetAddress inetAddressFromBytes(byte[] a) throws UnknownHostException { return p._inetAddressFromBytes(a); }
60 abstract String _timeZoneGetDisplayName(TimeZone tz, boolean dst, boolean showlong, Locale l);
61 public static String timeZoneGetDisplayName(TimeZone tz, boolean dst, boolean showlong, Locale l) { return p._timeZoneGetDisplayName(tz,dst,showlong,l); }
62 public static String timeZoneGetDisplayName(TimeZone tz, boolean dst, boolean showlong) { return timeZoneGetDisplayName(tz,dst,showlong,Locale.getDefault()); }
64 abstract RandomAccessFile _truncatedRandomAccessFile(File f, String mode) throws IOException;
65 public static RandomAccessFile truncatedRandomAccessFile(File f, String mode) throws IOException { return p._truncatedRandomAccessFile(f,mode); }
67 static class Jdk11 extends Platform {
68 boolean _atomicCreateFile(File f) throws IOException {
69 // This is not atomic, but its the best we can do on jdk 1.1
70 if(f.exists()) return false;
71 new FileOutputStream(f).close();
74 void _socketHalfClose(Socket s, boolean output) throws IOException {
75 throw new IOException("half closing sockets not supported");
77 InetAddress _inetAddressFromBytes(byte[] a) throws UnknownHostException {
78 if(a.length != 4) throw new UnknownHostException("only ipv4 addrs supported");
79 return InetAddress.getByName(""+(a[0]&0xff)+"."+(a[1]&0xff)+"."+(a[2]&0xff)+"."+(a[3]&0xff));
81 void _socketSetKeepAlive(Socket s, boolean on) throws SocketException {
82 if(on) throw new SocketException("keepalive not supported");
84 String _timeZoneGetDisplayName(TimeZone tz, boolean dst, boolean showlong, Locale l) {
85 String[][] zs = new DateFormatSymbols(l).getZoneStrings();
86 String id = tz.getID();
87 for(int i=0;i<zs.length;i++)
88 if(zs[i][0].equals(id))
89 return zs[i][dst ? (showlong ? 3 : 4) : (showlong ? 1 : 2)];
90 StringBuffer sb = new StringBuffer("GMT");
91 int off = tz.getRawOffset() / 1000;
92 if(off < 0) { sb.append("-"); off = -off; }
94 sb.append(off/3600); off = off%3600;
95 if(off > 0) sb.append(":").append(off/60); off=off%60;
96 if(off > 0) sb.append(":").append(off);
100 RandomAccessFile _truncatedRandomAccessFile(File f, String mode) throws IOException {
101 new FileOutputStream(f).close();
102 return new RandomAccessFile(f,mode);
106 static class Jdk12 extends Jdk11 {
107 boolean _atomicCreateFile(File f) throws IOException {
108 return f.createNewFile();
111 String _timeZoneGetDisplayName(TimeZone tz, boolean dst, boolean showlong, Locale l) {
112 return tz.getDisplayName(dst,showlong ? TimeZone.LONG : TimeZone.SHORT, l);
115 RandomAccessFile _truncatedRandomAccessFile(File f, String mode) throws IOException {
116 RandomAccessFile raf = new RandomAccessFile(f,mode);
122 static class Jdk13 extends Jdk12 {
123 void _socketHalfClose(Socket s, boolean output) throws IOException {
124 if(output) s.shutdownOutput();
125 else s.shutdownInput();
128 void _socketSetKeepAlive(Socket s, boolean on) throws SocketException {
133 static class Jdk14 extends Jdk13 {
134 InetAddress _inetAddressFromBytes(byte[] a) throws UnknownHostException { return InetAddress.getByAddress(a); }