Package com.sun.jna.platform.linux
Class Udev.UdevDevice
- java.lang.Object
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- com.sun.jna.PointerType
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- com.sun.jna.platform.linux.Udev.UdevDevice
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- All Implemented Interfaces:
NativeMapped
- Enclosing interface:
- Udev
public static class Udev.UdevDevice extends PointerType
To introspect a local device on a system, a udev device object can be created viaUdev.UdevContext.deviceNewFromSyspath(String)and friends. The device object allows one to query current state, read and write attributes and lookup properties of the device in question.
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Constructor Summary
Constructors Constructor Description UdevDevice()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.StringgetDevnode()Gets the devnode of this devicejava.lang.StringgetDevtype()Gets the devtype of this deviceUdev.UdevDevicegetParent()Gets the parent of this deviceUdev.UdevDevicegetParentWithSubsystemDevtype(java.lang.String subsystem, java.lang.String devtype)Gets the parent of this device matching a subsystem and devtypejava.lang.StringgetPropertyValue(java.lang.String key)Retrieves a device property from this devicejava.lang.StringgetSubsystem()Gets the subsystem of this devicejava.lang.StringgetSysattrValue(java.lang.String sysattr)Retrieves a device attribute from this devicejava.lang.StringgetSysname()Gets the sysname of this devicejava.lang.StringgetSyspath()Gets the syspath of this deviceUdev.UdevDeviceref()Acquire a further reference to this object.voidunref()Drop a reference to this object.-
Methods inherited from class com.sun.jna.PointerType
equals, fromNative, getPointer, hashCode, nativeType, setPointer, toNative, toString
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Method Detail
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ref
public Udev.UdevDevice ref()
Acquire a further reference to this object.- Returns:
- this object, unmodified.
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unref
public void unref()
Drop a reference to this object. Once the reference count hits 0, the context object is destroyed and freed.
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getParent
public Udev.UdevDevice getParent()
Gets the parent of this device- Returns:
- the parent device. No additional reference to this device is acquired, but the child device owns a reference to the parent device. On failure, NULL is returned.
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getParentWithSubsystemDevtype
public Udev.UdevDevice getParentWithSubsystemDevtype(java.lang.String subsystem, java.lang.String devtype)
Gets the parent of this device matching a subsystem and devtype- Parameters:
subsystem- The subsystem to matchdevtype- The device type to match- Returns:
- the parent device. No additional reference to this device is acquired, but the child device owns a reference to the parent device. On failure, NULL is returned.
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getSyspath
public java.lang.String getSyspath()
Gets the syspath of this device- Returns:
- a string that describes the syspath. On failure, may return NULL.
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getSysname
public java.lang.String getSysname()
Gets the sysname of this device- Returns:
- a string that describes the sysname. On failure, may return NULL.
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getDevnode
public java.lang.String getDevnode()
Gets the devnode of this device- Returns:
- a string that describes the devnode. On failure, may return NULL.
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getDevtype
public java.lang.String getDevtype()
Gets the devtype of this device- Returns:
- a string that describes the devtype. On failure, may return NULL.
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getSubsystem
public java.lang.String getSubsystem()
Gets the subsystem of this device- Returns:
- a string that describes the subsystem. On failure, may return NULL.
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getSysattrValue
public java.lang.String getSysattrValue(java.lang.String sysattr)
Retrieves a device attribute from this device- Parameters:
sysattr- The attribute to retrieve.- Returns:
- a string of the requested value. On error, NULL is returned. Attributes that may contain NUL bytes should not be retrieved with udev_device_get_sysattr_value(); instead, read them directly from the files within the device's syspath.
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getPropertyValue
public java.lang.String getPropertyValue(java.lang.String key)
Retrieves a device property from this device- Parameters:
key- The property to retrieve.- Returns:
- a string of the requested value. On error, NULL is returned.
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