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Context.java
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100 lines (93 loc) · 2.95 KB
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/*
* Copyright 2013 Klaus Reimer <[email protected]>
* See LICENSE.md for licensing information.
*
* Based on libusb <http://libusb.info/>:
*
* Copyright 2001 Johannes Erdfelt <[email protected]>
* Copyright 2007-2009 Daniel Drake <[email protected]>
* Copyright 2010-2012 Peter Stuge <[email protected]>
* Copyright 2008-2013 Nathan Hjelm <[email protected]>
* Copyright 2009-2013 Pete Batard <[email protected]>
* Copyright 2009-2013 Ludovic Rousseau <[email protected]>
* Copyright 2010-2012 Michael Plante <[email protected]>
* Copyright 2011-2013 Hans de Goede <[email protected]>
* Copyright 2012-2013 Martin Pieuchot <[email protected]>
* Copyright 2012-2013 Toby Gray <[email protected]>
*/
package org.usb4java;
/**
* Structure representing a libusb session. The concept of individual libusb
* sessions allows for your program to use two libraries (or dynamically load
* two modules) which both independently use libusb. This will prevent
* interference between the individual libusb users - for example
* {@link LibUsb#setDebug(Context, int)} will not affect the other user of the
* library, and {@link LibUsb#exit(Context)} will not destroy resources that the
* other user is still using.
*
* Sessions are created by {@link LibUsb#init(Context)} and destroyed through
* {@link LibUsb#exit(Context)}. If your application is guaranteed to only ever
* include a single libusb user (i.e. you), you do not have to worry about
* contexts: pass NULL in every function call where a context is required. The
* default context will be used.
*
* @author Klaus Reimer ([email protected])
*/
public final class Context
{
/** The native pointer to the context structure. */
private long contextPointer;
/**
* Constructs a new libusb context. Must be passed to
* {@link LibUsb#init(Context)} before passing it to any other method.
*/
public Context()
{
// Empty
}
/**
* Returns the native pointer to the context structure.
*
* @return The native pointer to the context structure.
*/
public long getPointer()
{
return this.contextPointer;
}
@Override
public int hashCode()
{
final int prime = 31;
int result = 1;
result = (prime * result)
+ (int) (this.contextPointer ^ (this.contextPointer >>> 32));
return result;
}
@Override
public boolean equals(final Object obj)
{
if (this == obj)
{
return true;
}
if (obj == null)
{
return false;
}
if (this.getClass() != obj.getClass())
{
return false;
}
final Context other = (Context) obj;
if (this.contextPointer != other.contextPointer)
{
return false;
}
return true;
}
@Override
public String toString()
{
return String.format("libusb context 0x%x", this.contextPointer);
}
}