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* See LICENSE.md for licensing information.

package org.usb4java;

import java.util.Iterator;

/**

* List of poll file descriptors as returned by {@link LibUsb#getPollfds(Context)}.

* @author Klaus Reimer (k@ailis.de)

public final class Pollfds implements Iterable<Pollfd>

{

/** The native pointer to the pollfd array. */

private long pollfdsPointer;

/** The number of file descriptors in the list. */

private int size;

/**

* Package-private constructor to prevent manual instantiation. Structures are

* always created by JNI.

Pollfds()

{

// Empty

}

/**

* Returns the native pointer.

* @return The native pointer.

public long getPointer()

{

return this.pollfdsPointer;

}

/**

* Returns the number of poll file descriptors in the list.

* @return The number of poll file descriptors in the list.

public int getSize()

{

return this.size;

}

/**

* Returns the poll file descriptor with the specified index.

* @param index

* The index.

* @return The poll file descriptor or null when index is out of bounds.

public native Pollfd get(final int index);

@Override

public Iterator<Pollfd> iterator()

{

return new PollfdsIterator(this);

}

@Override

public int hashCode()

{

final int prime = 31;

int result = 1;

result = (prime * result)

+ (int) (this.pollfdsPointer ^ (this.pollfdsPointer >>> 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 Pollfds other = (Pollfds) obj;

return this.pollfdsPointer == other.pollfdsPointer;

}

@Override

public String toString()

{

return String.format("libusb pollfd list 0x%x with size %d",

this.pollfdsPointer, this.size);

}

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