gnu.trove.queue.TDoubleQueue Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of trove4j Show documentation

The Trove library provides high speed regular and primitive collections for Java.

There is a newer version: 3.0.3

///////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2009, Rob Eden All Rights Reserved.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
///////////////////////////////////////////////////////////////////////////////

package gnu.trove.queue;


import gnu.trove.TDoubleCollection;

import java.io.Serializable;

/**
 * Interface for Trove queue implementations.
 *
 * @see java.util.Queue
 */
public interface TDoubleQueue extends TDoubleCollection {
	/**
	 * Retrieves and removes the head of this queue. This method differs from
	 * {@link #poll} only in that it throws an exception if this queue is empty.
	 */
	public double element();


	/**
	 * Inserts the specified element into this queue if it is possible to do so
	 * immediately without violating capacity restrictions. When using a
	 * capacity-restricted queue, this method is generally preferable to
	 * {@link #add}, which can fail to insert an element only by throwing an exception.
	 *
	 * @param e		The element to add.
	 *
	 * @return	true if the element was added to this queue, else false
	 */
	public boolean offer( double e );


	/**
	 * Retrieves, but does not remove, the head of this queue, or returns
	 * {@link #getNoEntryValue} if this queue is empty.
	 *
	 * @return	the head of this queue, or {@link #getNoEntryValue} if this queue is empty 
	 */
	public double peek();


	/**
	 * Retrieves and removes the head of this queue, or returns {@link #getNoEntryValue}
	 * if this queue is empty.
	 *
	 * @return	the head of this queue, or {@link #getNoEntryValue} if this queue is empty
	 */
	public double poll();
}