SystemUtils (NetarchiveSuite 7.1 API)

java.lang.Object
- dk.netarkivet.common.utils.SystemUtils

```
public class SystemUtils
extends Object
```
Miscellanous utilities for getting system resources.

Field Summary

Fields
Modifier and Type Field Description

static String LOCALHOST
Hostname for this machine used when no name can be found, or when the actual name doesn't matter.

Constructor Summary

Constructors
Constructor Description

SystemUtils()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static void`	`checkPortNotUsed(int port)`	Check that a given port is not in use.
`static List<String>`	`getCurrentClasspath()`	Get the current class path entries.
`static String`	`getLocalHostName()`	Get the first hostname available for this machine, or "localhost" if none are available.
`static String`	`getLocalIP()`	Looks up the IP number of the local host.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - LOCALHOST
```
public static final String LOCALHOST
```
    Hostname for this machine used when no name can be found, or when the actual name doesn't matter.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - SystemUtils
```
public SystemUtils()
```
- Method Detail
  - getLocalIP
```
public static String getLocalIP()
```
    Looks up the IP number of the local host. Note that Java does not guarantee that the result is IPv4 or IPv6.
    
    Returns:
    
    the found IP; returns "UNKNOWNIP" if it could not be found.
  - getLocalHostName
```
public static String getLocalHostName()
```
    Get the first hostname available for this machine, or "localhost" if none are available.
    
    Returns:
    
    A hostname, as returned by InetAddress.getLocalHost().getCanonicalHostName()()
  - checkPortNotUsed
```
public static void checkPortNotUsed(int port)
```
    Check that a given port is not in use. If this method returns normally, the port is safe to bind.
    
    Parameters:
    
    port - Port to check
    
    Throws:
    
    IOFailure - if the port cannot be bound.
  - getCurrentClasspath
```
public static List<String> getCurrentClasspath()
```
    Get the current class path entries. Note that this does not work if we've been invoked with java -jar, as that option silently ignores classpaths.
    
    Returns:
    
    List of directories/jar files in the current class path.