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<div class="subTitle">edu.emory.mathcs.backport.java.util</div>
<h2 title="Class AbstractQueue" class="title">Class AbstractQueue</h2>
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<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>java.util.AbstractCollection</li>
<li>
<ul class="inheritance">
<li><a href="../../../../../../edu/emory/mathcs/backport/java/util/AbstractCollection.html" title="class in edu.emory.mathcs.backport.java.util">edu.emory.mathcs.backport.java.util.AbstractCollection</a></li>
<li>
<ul class="inheritance">
<li>edu.emory.mathcs.backport.java.util.AbstractQueue</li>
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<dl>
<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html" title="interface in edu.emory.mathcs.backport.java.util">Queue</a>, java.lang.Iterable, java.util.Collection</dd>
</dl>
<dl>
<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ArrayBlockingQueue.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">ArrayBlockingQueue</a>, <a href="../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ConcurrentLinkedQueue.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">ConcurrentLinkedQueue</a>, <a href="../../../../../../edu/emory/mathcs/backport/java/util/concurrent/DelayQueue.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">DelayQueue</a>, <a href="../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingDeque.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">LinkedBlockingDeque</a>, <a href="../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">LinkedBlockingQueue</a>, <a href="../../../../../../edu/emory/mathcs/backport/java/util/concurrent/PriorityBlockingQueue.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">PriorityBlockingQueue</a>, <a href="../../../../../../edu/emory/mathcs/backport/java/util/PriorityQueue.html" title="class in edu.emory.mathcs.backport.java.util">PriorityQueue</a>, <a href="../../../../../../edu/emory/mathcs/backport/java/util/concurrent/SynchronousQueue.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">SynchronousQueue</a></dd>
</dl>
<hr>
<br>
<pre>public abstract class <span class="strong">AbstractQueue</span>
extends <a href="../../../../../../edu/emory/mathcs/backport/java/util/AbstractCollection.html" title="class in edu.emory.mathcs.backport.java.util">AbstractCollection</a>
implements <a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html" title="interface in edu.emory.mathcs.backport.java.util">Queue</a></pre>
<div class="block">This class provides skeletal implementations of some <a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html" title="interface in edu.emory.mathcs.backport.java.util"><code>Queue</code></a>
operations. The implementations in this class are appropriate when
the base implementation does <em>not</em> allow <tt>null</tt>
elements. Methods <a href="../../../../../../edu/emory/mathcs/backport/java/util/AbstractQueue.html#add(java.lang.Object)"><code>add</code></a>, <a href="../../../../../../edu/emory/mathcs/backport/java/util/AbstractQueue.html#remove()"><code>remove</code></a>, and
<a href="../../../../../../edu/emory/mathcs/backport/java/util/AbstractQueue.html#element()"><code>element</code></a> are based on <a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#offer(java.lang.Object)"><code>offer</code></a>, <a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#poll()"><code>poll</code></a>, and <a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#peek()"><code>peek</code></a>, respectively but throw
exceptions instead of indicating failure via <tt>false</tt> or
<tt>null</tt> returns.
<p> A <tt>Queue</tt> implementation that extends this class must
minimally define a method <a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#offer(java.lang.Object)"><code>Queue.offer(java.lang.Object)</code></a> which does not permit
insertion of <tt>null</tt> elements, along with methods <a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#peek()"><code>Queue.peek()</code></a>, <a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#poll()"><code>Queue.poll()</code></a>, <code>Collection.size()</code>, and a
<code>Collection.iterator()</code> supporting <code>Iterator.remove()</code>. Typically, additional methods will be overridden
as well. If these requirements cannot be met, consider instead
subclassing <a href="../../../../../../edu/emory/mathcs/backport/java/util/AbstractCollection.html" title="class in edu.emory.mathcs.backport.java.util"><code>AbstractCollection</code></a>.
<p>This class is a member of the
<a href="../../../../../../../technotes/guides/collections/index.html">
Java Collections Framework</a>.</div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>1.5</dd>
<dt><span class="strong">Author:</span></dt>
<dd>Doug Lea</dd></dl>
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<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier</th>
<th class="colLast" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><strong><a href="../../../../../../edu/emory/mathcs/backport/java/util/AbstractQueue.html#AbstractQueue()">AbstractQueue</a></strong>()</code>
<div class="block">Constructor for use by subclasses.</div>
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<caption><span>Methods</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../../edu/emory/mathcs/backport/java/util/AbstractQueue.html#add(java.lang.Object)">add</a></strong>(java.lang.Object e)</code>
<div class="block">Inserts the specified element into this queue if it is possible to do so
immediately without violating capacity restrictions, returning
<tt>true</tt> upon success and throwing an <tt>IllegalStateException</tt>
if no space is currently available.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../../edu/emory/mathcs/backport/java/util/AbstractQueue.html#addAll(java.util.Collection)">addAll</a></strong>(java.util.Collection c)</code>
<div class="block">Adds all of the elements in the specified collection to this
queue.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../../edu/emory/mathcs/backport/java/util/AbstractQueue.html#clear()">clear</a></strong>()</code>
<div class="block">Removes all of the elements from this queue.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../../../../edu/emory/mathcs/backport/java/util/AbstractQueue.html#element()">element</a></strong>()</code>
<div class="block">Retrieves, but does not remove, the head of this queue.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../../../../edu/emory/mathcs/backport/java/util/AbstractQueue.html#remove()">remove</a></strong>()</code>
<div class="block">Retrieves and removes the head of this queue.</div>
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<h3>Methods inherited from class edu.emory.mathcs.backport.java.util.<a href="../../../../../../edu/emory/mathcs/backport/java/util/AbstractCollection.html" title="class in edu.emory.mathcs.backport.java.util">AbstractCollection</a></h3>
<code><a href="../../../../../../edu/emory/mathcs/backport/java/util/AbstractCollection.html#toArray()">toArray</a>, <a href="../../../../../../edu/emory/mathcs/backport/java/util/AbstractCollection.html#toArray(java.lang.Object[])">toArray</a></code></li>
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<h3>Methods inherited from class java.util.AbstractCollection</h3>
<code>contains, containsAll, isEmpty, iterator, remove, removeAll, retainAll, size, toString</code></li>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</code></li>
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<h3>Methods inherited from interface edu.emory.mathcs.backport.java.util.<a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html" title="interface in edu.emory.mathcs.backport.java.util">Queue</a></h3>
<code><a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#offer(java.lang.Object)">offer</a>, <a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#peek()">peek</a>, <a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#poll()">poll</a></code></li>
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<h3>Methods inherited from interface java.util.Collection</h3>
<code>contains, containsAll, equals, hashCode, isEmpty, iterator, remove, removeAll, retainAll, size, toArray, toArray</code></li>
</ul>
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<h3>Constructor Detail</h3>
<a name="AbstractQueue()">
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<h4>AbstractQueue</h4>
<pre>protected AbstractQueue()</pre>
<div class="block">Constructor for use by subclasses.</div>
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<h3>Method Detail</h3>
<a name="add(java.lang.Object)">
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<h4>add</h4>
<pre>public boolean add(java.lang.Object e)</pre>
<div class="block">Inserts the specified element into this queue if it is possible to do so
immediately without violating capacity restrictions, returning
<tt>true</tt> upon success and throwing an <tt>IllegalStateException</tt>
if no space is currently available.
<p>This implementation returns <tt>true</tt> if <tt>offer</tt> succeeds,
else throws an <tt>IllegalStateException</tt>.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#add(java.lang.Object)">add</a></code> in interface <code><a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html" title="interface in edu.emory.mathcs.backport.java.util">Queue</a></code></dd>
<dt><strong>Specified by:</strong></dt>
<dd><code>add</code> in interface <code>java.util.Collection</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>add</code> in class <code>java.util.AbstractCollection</code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>e</code> - the element to add</dd>
<dt><span class="strong">Returns:</span></dt><dd><tt>true</tt> (as specified by <code>Collection.add(java.lang.Object)</code>)</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.IllegalStateException</code> - if the element cannot be added at this
time due to capacity restrictions</dd>
<dd><code>java.lang.ClassCastException</code> - if the class of the specified element
prevents it from being added to this queue</dd>
<dd><code>java.lang.NullPointerException</code> - if the specified element is null and
this queue does not permit null elements</dd>
<dd><code>java.lang.IllegalArgumentException</code> - if some property of this element
prevents it from being added to this queue</dd></dl>
</li>
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<a name="remove()">
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<h4>remove</h4>
<pre>public java.lang.Object remove()</pre>
<div class="block">Retrieves and removes the head of this queue. This method differs
from <a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#poll()"><code>poll</code></a> only in that it throws an exception if this
queue is empty.
<p>This implementation returns the result of <tt>poll</tt>
unless the queue is empty.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#remove()">remove</a></code> in interface <code><a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html" title="interface in edu.emory.mathcs.backport.java.util">Queue</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the head of this queue</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.util.NoSuchElementException</code> - if this queue is empty</dd></dl>
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<a name="element()">
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<h4>element</h4>
<pre>public java.lang.Object element()</pre>
<div class="block">Retrieves, but does not remove, the head of this queue. This method
differs from <a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#peek()"><code>peek</code></a> only in that it throws an exception if
this queue is empty.
<p>This implementation returns the result of <tt>peek</tt>
unless the queue is empty.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#element()">element</a></code> in interface <code><a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html" title="interface in edu.emory.mathcs.backport.java.util">Queue</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the head of this queue</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.util.NoSuchElementException</code> - if this queue is empty</dd></dl>
</li>
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<a name="clear()">
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<h4>clear</h4>
<pre>public void clear()</pre>
<div class="block">Removes all of the elements from this queue.
The queue will be empty after this call returns.
<p>This implementation repeatedly invokes <a href="../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#poll()"><code>poll</code></a> until it
returns <tt>null</tt>.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>clear</code> in interface <code>java.util.Collection</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>clear</code> in class <code>java.util.AbstractCollection</code></dd>
</dl>
</li>
</ul>
<a name="addAll(java.util.Collection)">
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<h4>addAll</h4>
<pre>public boolean addAll(java.util.Collection c)</pre>
<div class="block">Adds all of the elements in the specified collection to this
queue. Attempts to addAll of a queue to itself result in
<tt>IllegalArgumentException</tt>. Further, the behavior of
this operation is undefined if the specified collection is
modified while the operation is in progress.
<p>This implementation iterates over the specified collection,
and adds each element returned by the iterator to this
queue, in turn. A runtime exception encountered while
trying to add an element (including, in particular, a
<tt>null</tt> element) may result in only some of the elements
having been successfully added when the associated exception is
thrown.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>addAll</code> in interface <code>java.util.Collection</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>addAll</code> in class <code>java.util.AbstractCollection</code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>c</code> - collection containing elements to be added to this queue</dd>
<dt><span class="strong">Returns:</span></dt><dd><tt>true</tt> if this queue changed as a result of the call</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.ClassCastException</code> - if the class of an element of the specified
collection prevents it from being added to this queue</dd>
<dd><code>java.lang.NullPointerException</code> - if the specified collection contains a
null element and this queue does not permit null elements,
or if the specified collection is null</dd>
<dd><code>java.lang.IllegalArgumentException</code> - if some property of an element of the
specified collection prevents it from being added to this
queue, or if the specified collection is this queue</dd>
<dd><code>java.lang.IllegalStateException</code> - if not all the elements can be added at
this time due to insertion restrictions</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../../edu/emory/mathcs/backport/java/util/AbstractQueue.html#add(java.lang.Object)"><code>add(Object)</code></a></dd></dl>
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