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90 lines
2.2 KiB
Java
90 lines
2.2 KiB
Java
package com.jwetherell.algorithms.data_structures.interfaces;
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/**
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* A queue is a particular kind of abstract data type or collection in
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* which the entities in the collection are kept in order and the principal (or
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* only) operations on the collection are the addition of entities to the rear
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* terminal position and removal of entities from the front terminal position.
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* This makes the queue a First-In-First-Out (FIFO) data structure. In a FIFO
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* data structure, the first element added to the queue will be the first one to
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* be removed.
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*
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* http://en.wikipedia.org/wiki/Queue_(abstract_data_type)
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*
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* @author Justin Wetherell <phishman3579@gmail.com>
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*/
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public interface IQueue<T> {
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/**
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* Add a value to the beginning of the queue.
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*
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* @param value to add to queue.
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* @return True if added to queue.
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*/
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public boolean offer(T value);
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/**
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* Remove a value from the tail of the queue.
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*
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* @return value from the tail of the queue.
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*/
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public T poll();
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/**
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* Get but do not remove tail of the queue.
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*
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* @return value from the tail of the queue.
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*/
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public T peek();
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/**
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* Remove the value from the queue.
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*
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* @param value to remove from the queue.
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* @return True if the value was removed from the queue.
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*/
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public boolean remove(T value);
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/**
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* Clear the entire queue.
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*/
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public void clear();
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/**
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* Does the queue contain the value.
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*
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* @param value to find in the queue.
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* @return True if the queue contains the value.
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*/
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public boolean contains(T value);
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/**
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* Get the size of the queue.
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*
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* @return size of the queue.
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*/
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public int size();
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/**
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* Validate the queue according to the invariants.
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*
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* @return True if the queue is valid.
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*/
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public boolean validate();
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/**
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* Get this Queue as a Java compatible Queue
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*
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* @return Java compatible Queue
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*/
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public java.util.Queue<T> toQueue();
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/**
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* Get this Queue as a Java compatible Collection
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*
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* @return Java compatible Collection
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*/
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public java.util.Collection<T> toCollection();
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}
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