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<div class="subTitle">org.jgrapht.util</div>
<h2 title="Class PrefetchIterator" class="title">Class PrefetchIterator&lt;E&gt;</h2>
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<li>org.jgrapht.util.PrefetchIterator&lt;E&gt;</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Enumeration.html?is-external=true" title="class or interface in java.util">Enumeration</a>&lt;E&gt;, <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;E&gt;</dd>
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<pre>public class <span class="strong">PrefetchIterator&lt;E&gt;</span>
extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
implements <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;E&gt;, <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Enumeration.html?is-external=true" title="class or interface in java.util">Enumeration</a>&lt;E&gt;</pre>
<div class="block">Utility class to help implement an iterator/enumerator in which the hasNext()
method needs to calculate the next elements ahead of time.
<p>Many classes which implement an iterator face a common problem: if there
is no easy way to calculate hasNext() other than to call getNext(), then they
save the result for fetching in the next call to getNext(). This utility
helps in doing just that.
<p><b>Usage:</b> The new iterator class will hold this class as a member
variable and forward the hasNext() and next() to it. When creating an
instance of this class, you supply it with a functor that is doing the real
job of calculating the next element.
<pre><code>
//This class supllies enumeration of integer till 100.
public class IteratorExample implements Enumeration{
private int counter=0;
private PrefetchIterator nextSupplier;
IteratorExample()
{
nextSupplier = new PrefetchIterator(new PrefetchIterator.NextElementFunctor(){
public Object nextElement() throws NoSuchElementException {
counter++;
if (counter &lt;= 100)
throw new NoSuchElementException();
else
return new Integer(counter);
}
});
}
//forwarding to nextSupplier and return its returned value
public boolean hasMoreElements() {
return this.nextSupplier.hasMoreElements();
}
// forwarding to nextSupplier and return its returned value
public Object nextElement() {
return this.nextSupplier.nextElement();
}
}</code>
</pre></div>
<dl><dt><span class="strong">Author:</span></dt>
<dd>Assaf_Lehr</dd></dl>
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<td class="colFirst"><code>static interface&nbsp;</code></td>
<td class="colLast"><code><strong><a href="../../../org/jgrapht/util/PrefetchIterator.NextElementFunctor.html" title="interface in org.jgrapht.util">PrefetchIterator.NextElementFunctor</a>&lt;<a href="../../../org/jgrapht/util/PrefetchIterator.NextElementFunctor.html" title="type parameter in PrefetchIterator.NextElementFunctor">EE</a>&gt;</strong></code>&nbsp;</td>
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<td class="colOne"><code><strong><a href="../../../org/jgrapht/util/PrefetchIterator.html#PrefetchIterator(org.jgrapht.util.PrefetchIterator.NextElementFunctor)">PrefetchIterator</a></strong>(<a href="../../../org/jgrapht/util/PrefetchIterator.NextElementFunctor.html" title="interface in org.jgrapht.util">PrefetchIterator.NextElementFunctor</a>&lt;<a href="../../../org/jgrapht/util/PrefetchIterator.html" title="type parameter in PrefetchIterator">E</a>&gt;&nbsp;aEnum)</code>&nbsp;</td>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../org/jgrapht/util/PrefetchIterator.html#hasMoreElements()">hasMoreElements</a></strong>()</code>
<div class="block">If (isGetNextLastResultUpToDate==true) returns true else 1.</div>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../org/jgrapht/util/PrefetchIterator.html#hasNext()">hasNext</a></strong>()</code>&nbsp;</td>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../org/jgrapht/util/PrefetchIterator.html#isEnumerationStartedEmpty()">isEnumerationStartedEmpty</a></strong>()</code>
<div class="block">Tests whether the enumeration started as an empty one.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><code><a href="../../../org/jgrapht/util/PrefetchIterator.html" title="type parameter in PrefetchIterator">E</a></code></td>
<td class="colLast"><code><strong><a href="../../../org/jgrapht/util/PrefetchIterator.html#next()">next</a></strong>()</code>&nbsp;</td>
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<td class="colFirst"><code><a href="../../../org/jgrapht/util/PrefetchIterator.html" title="type parameter in PrefetchIterator">E</a></code></td>
<td class="colLast"><code><strong><a href="../../../org/jgrapht/util/PrefetchIterator.html#nextElement()">nextElement</a></strong>()</code>
<div class="block">1.</div>
</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../org/jgrapht/util/PrefetchIterator.html#remove()">remove</a></strong>()</code>
<div class="block">Always throws UnsupportedOperationException.</div>
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<h4>PrefetchIterator</h4>
<pre>public&nbsp;PrefetchIterator(<a href="../../../org/jgrapht/util/PrefetchIterator.NextElementFunctor.html" title="interface in org.jgrapht.util">PrefetchIterator.NextElementFunctor</a>&lt;<a href="../../../org/jgrapht/util/PrefetchIterator.html" title="type parameter in PrefetchIterator">E</a>&gt;&nbsp;aEnum)</pre>
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<h4>nextElement</h4>
<pre>public&nbsp;<a href="../../../org/jgrapht/util/PrefetchIterator.html" title="type parameter in PrefetchIterator">E</a>&nbsp;nextElement()</pre>
<div class="block">1. Retrieves the saved value or calculates it if it does not exist 2.
Changes isGetNextLastResultUpToDate to false. (Because it does not save
the NEXT element now; it saves the current one!)</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Enumeration.html?is-external=true#nextElement()" title="class or interface in java.util">nextElement</a></code>&nbsp;in interface&nbsp;<code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Enumeration.html?is-external=true" title="class or interface in java.util">Enumeration</a>&lt;<a href="../../../org/jgrapht/util/PrefetchIterator.html" title="type parameter in PrefetchIterator">E</a>&gt;</code></dd>
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<h4>hasMoreElements</h4>
<pre>public&nbsp;boolean&nbsp;hasMoreElements()</pre>
<div class="block">If (isGetNextLastResultUpToDate==true) returns true else 1. calculates
getNext() and saves it 2. sets isGetNextLastResultUpToDate to true.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Enumeration.html?is-external=true#hasMoreElements()" title="class or interface in java.util">hasMoreElements</a></code>&nbsp;in interface&nbsp;<code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Enumeration.html?is-external=true" title="class or interface in java.util">Enumeration</a>&lt;<a href="../../../org/jgrapht/util/PrefetchIterator.html" title="type parameter in PrefetchIterator">E</a>&gt;</code></dd>
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<h4>isEnumerationStartedEmpty</h4>
<pre>public&nbsp;boolean&nbsp;isEnumerationStartedEmpty()</pre>
<div class="block">Tests whether the enumeration started as an empty one. It does not matter
if it hasMoreElements() now, only at initialization time. Efficiency: if
nextElements(), hasMoreElements() were never used, it activates the
hasMoreElements() once. Else it is immediately(O(1))</div>
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<h4>hasNext</h4>
<pre>public&nbsp;boolean&nbsp;hasNext()</pre>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true#hasNext()" title="class or interface in java.util">hasNext</a></code>&nbsp;in interface&nbsp;<code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;<a href="../../../org/jgrapht/util/PrefetchIterator.html" title="type parameter in PrefetchIterator">E</a>&gt;</code></dd>
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<h4>next</h4>
<pre>public&nbsp;<a href="../../../org/jgrapht/util/PrefetchIterator.html" title="type parameter in PrefetchIterator">E</a>&nbsp;next()</pre>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true#next()" title="class or interface in java.util">next</a></code>&nbsp;in interface&nbsp;<code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;<a href="../../../org/jgrapht/util/PrefetchIterator.html" title="type parameter in PrefetchIterator">E</a>&gt;</code></dd>
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<h4>remove</h4>
<pre>public&nbsp;void&nbsp;remove()
throws <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/UnsupportedOperationException.html?is-external=true" title="class or interface in java.lang">UnsupportedOperationException</a></pre>
<div class="block">Always throws UnsupportedOperationException.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true#remove()" title="class or interface in java.util">remove</a></code>&nbsp;in interface&nbsp;<code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;<a href="../../../org/jgrapht/util/PrefetchIterator.html" title="type parameter in PrefetchIterator">E</a>&gt;</code></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/UnsupportedOperationException.html?is-external=true" title="class or interface in java.lang">UnsupportedOperationException</a></code></dd></dl>
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