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<div class="subTitle">org.apache.commons.collections.iterators</div>
<h2 title="Class IteratorChain" class="title">Class IteratorChain</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>org.apache.commons.collections.iterators.IteratorChain</li>
</ul>
</li>
</ul>
<div class="description">
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<dt>All Implemented Interfaces:</dt>
<dd>java.util.Iterator</dd>
</dl>
<hr>
<br>
<pre>public class <span class="strong">IteratorChain</span>
extends java.lang.Object
implements java.util.Iterator</pre>
<div class="block"><p>An IteratorChain is an Iterator that wraps one or
more Iterators. When any method from the
Iterator interface is called, the IteratorChain will
proxy to a single underlying Iterator. The
IteratorChain will invoke the Iterators in sequence until
all Iterators are exhausted completely.</p>
<p>Under many circumstances, linking Iterators together
in this manner is more efficient (and convenient)
than reading out the contents of each Iterator into a
List and creating a new Iterator.</p>
<p>Calling a method that adds new Iterator<i>after
a method in the Iterator interface
has been called</i> will result in an
UnsupportedOperationException. Subclasses should <i>take care</i>
to not alter the underlying List of Iterators.</p></div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>2.1</dd>
<dt><span class="strong">Version:</span></dt>
<dd>$Id: IteratorChain.java,v 1.2.2.1 2004/05/22 12:14:04 scolebourne Exp $</dd>
<dt><span class="strong">Author:</span></dt>
<dd>Morgan Delagrange, <a href="mailto:scolebourne@joda.org">Stephen Colebourne</a></dd></dl>
</li>
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<caption><span>Fields</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected java.util.Iterator</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/collections/iterators/IteratorChain.html#currentIterator">currentIterator</a></strong></code> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/collections/iterators/IteratorChain.html#currentIteratorIndex">currentIteratorIndex</a></strong></code> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/collections/iterators/IteratorChain.html#isLocked">isLocked</a></strong></code> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected java.util.List</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/collections/iterators/IteratorChain.html#iteratorChain">iteratorChain</a></strong></code> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected java.util.Iterator</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/collections/iterators/IteratorChain.html#lastUsedIterator">lastUsedIterator</a></strong></code> </td>
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<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/collections/iterators/IteratorChain.html#IteratorChain()">IteratorChain</a></strong>()</code>
<div class="block">Construct an IteratorChain with no Iterators.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/collections/iterators/IteratorChain.html#IteratorChain(java.util.Collection)">IteratorChain</a></strong>(java.util.Collection iterators)</code>
<div class="block">Constructs a new <Code>IteratorChain</Code> over the collection
of iterators.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/collections/iterators/IteratorChain.html#IteratorChain(java.util.Iterator)">IteratorChain</a></strong>(java.util.Iterator iterator)</code>
<div class="block">Construct an IteratorChain with a single Iterator.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/collections/iterators/IteratorChain.html#IteratorChain(java.util.Iterator[])">IteratorChain</a></strong>(java.util.Iterator[] iterators)</code>
<div class="block">Constructs a new <Code>IteratorChain</Code> over the array
of iterators.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/collections/iterators/IteratorChain.html#IteratorChain(java.util.Iterator, java.util.Iterator)">IteratorChain</a></strong>(java.util.Iterator a,
java.util.Iterator b)</code>
<div class="block">Constructs a new <Code>IteratorChain</Code> over the two
given iterators.</div>
</td>
</tr>
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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>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/collections/iterators/IteratorChain.html#addIterator(java.util.Iterator)">addIterator</a></strong>(java.util.Iterator iterator)</code>
<div class="block">Add an Iterator to the end of the chain</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.util.List</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/collections/iterators/IteratorChain.html#getIterators()">getIterators</a></strong>()</code>
<div class="block">Get the list of Iterators (unmodifiable)</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/collections/iterators/IteratorChain.html#hasNext()">hasNext</a></strong>()</code>
<div class="block">Return true if any Iterator in the IteratorChain has a remaining
element.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/collections/iterators/IteratorChain.html#isLocked()">isLocked</a></strong>()</code>
<div class="block">Determine if modifications can still be made to the
IteratorChain.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/collections/iterators/IteratorChain.html#next()">next</a></strong>()</code>
<div class="block">Returns the next Object of the current Iterator</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/collections/iterators/IteratorChain.html#remove()">remove</a></strong>()</code>
<div class="block">Removes from the underlying collection the last element
returned by the Iterator.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/collections/iterators/IteratorChain.html#setIterator(int, java.util.Iterator)">setIterator</a></strong>(int index,
java.util.Iterator iterator)</code>
<div class="block">Set the Iterator at the given index</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/collections/iterators/IteratorChain.html#size()">size</a></strong>()</code>
<div class="block">Number of Iterators in the current IteratorChain.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/collections/iterators/IteratorChain.html#updateCurrentIterator()">updateCurrentIterator</a></strong>()</code> </td>
</tr>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
</ul>
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<pre>protected java.util.Iterator currentIterator</pre>
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<pre>protected int currentIteratorIndex</pre>
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<pre>protected final java.util.List iteratorChain</pre>
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<pre>protected java.util.Iterator lastUsedIterator</pre>
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<h4>IteratorChain</h4>
<pre>public IteratorChain()</pre>
<div class="block">Construct an IteratorChain with no Iterators.
You must add at least Iterator before calling
any method from the Iterator interface, or an
UnsupportedOperationException is thrown</div>
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<h4>IteratorChain</h4>
<pre>public IteratorChain(java.util.Collection iterators)</pre>
<div class="block">Constructs a new <Code>IteratorChain</Code> over the collection
of iterators.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>iterators</code> - the collection of iterators</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if iterators collection is or contains null</dd>
<dd><code>java.lang.ClassCastException</code> - if iterators collection doesn't contain an iterator</dd></dl>
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<h4>IteratorChain</h4>
<pre>public IteratorChain(java.util.Iterator iterator)</pre>
<div class="block">Construct an IteratorChain with a single Iterator.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>iterator</code> - first Iterator in the IteratorChain</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if the iterator is null</dd></dl>
</li>
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<h4>IteratorChain</h4>
<pre>public IteratorChain(java.util.Iterator[] iterators)</pre>
<div class="block">Constructs a new <Code>IteratorChain</Code> over the array
of iterators.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>iterators</code> - the array of iterators</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if iterators array is or contains null</dd></dl>
</li>
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<h4>IteratorChain</h4>
<pre>public IteratorChain(java.util.Iterator a,
java.util.Iterator b)</pre>
<div class="block">Constructs a new <Code>IteratorChain</Code> over the two
given iterators.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>a</code> - the first child iterator</dd><dd><code>b</code> - the second child iterator</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if either iterator is null</dd></dl>
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<h4>addIterator</h4>
<pre>public void addIterator(java.util.Iterator iterator)</pre>
<div class="block">Add an Iterator to the end of the chain</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>iterator</code> - Iterator to add</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.IllegalStateException</code> - if I've already started iterating</dd>
<dd><code>java.lang.NullPointerException</code> - if the iterator is null</dd></dl>
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<pre>public java.util.List getIterators()</pre>
<div class="block">Get the list of Iterators (unmodifiable)</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the unmodifiable list of iterators added</dd></dl>
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<pre>public boolean hasNext()
throws java.lang.UnsupportedOperationException</pre>
<div class="block">Return true if any Iterator in the IteratorChain has a remaining
element.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>hasNext</code> in interface <code>java.util.Iterator</code></dd>
<dt><span class="strong">Returns:</span></dt><dd>true if elements remain</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.UnsupportedOperationException</code> - if the IteratorChain does not contain at least one
Iterator</dd></dl>
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<pre>public boolean isLocked()</pre>
<div class="block">Determine if modifications can still be made to the
IteratorChain. IteratorChains cannot be modified
once they have executed a method from the Iterator
interface.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>true = IteratorChain cannot be modified; false =
IteratorChain can still be modified.</dd></dl>
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<h4>next</h4>
<pre>public java.lang.Object next()
throws java.util.NoSuchElementException,
java.lang.UnsupportedOperationException</pre>
<div class="block">Returns the next Object of the current Iterator</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>next</code> in interface <code>java.util.Iterator</code></dd>
<dt><span class="strong">Returns:</span></dt><dd>Object from the current Iterator</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.util.NoSuchElementException</code> - if all the Iterators are exhausted</dd>
<dd><code>java.lang.UnsupportedOperationException</code> - if the IteratorChain does not contain at least one
Iterator</dd></dl>
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<h4>remove</h4>
<pre>public void remove()
throws java.lang.UnsupportedOperationException,
java.lang.IllegalStateException</pre>
<div class="block">Removes from the underlying collection the last element
returned by the Iterator. As with next() and hasNext(),
this method calls remove() on the underlying Iterator.
Therefore, this method may throw an
UnsupportedOperationException if the underlying
Iterator does not support this method.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>remove</code> in interface <code>java.util.Iterator</code></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.UnsupportedOperationException</code> - if the remove operator is not supported by the underlying
Iterator or if there are no Iterators in the IteratorChain</dd>
<dd><code>java.lang.IllegalStateException</code> - if the next method has not yet been called, or the
remove method has already been called after the last
call to the next method.</dd></dl>
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<h4>setIterator</h4>
<pre>public void setIterator(int index,
java.util.Iterator iterator)
throws java.lang.IndexOutOfBoundsException</pre>
<div class="block">Set the Iterator at the given index</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>index</code> - index of the Iterator to replace</dd><dd><code>iterator</code> - Iterator to place at the given index</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.IndexOutOfBoundsException</code> - if index < 0 or index > size()</dd>
<dd><code>java.lang.IllegalStateException</code> - if I've already started iterating</dd>
<dd><code>java.lang.NullPointerException</code> - if the iterator is null</dd></dl>
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<h4>size</h4>
<pre>public int size()</pre>
<div class="block">Number of Iterators in the current IteratorChain.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>Iterator count</dd></dl>
</li>
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<h4>updateCurrentIterator</h4>
<pre>protected void updateCurrentIterator()</pre>
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