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<div class="subTitle">com.amazon.carbonado.cursor</div>
<h2 title="Class GroupedCursor" class="title">Class GroupedCursor<S,G></h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li><a href="../../../../com/amazon/carbonado/cursor/AbstractCursor.html" title="class in com.amazon.carbonado.cursor">com.amazon.carbonado.cursor.AbstractCursor</a><G></li>
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<li>com.amazon.carbonado.cursor.GroupedCursor<S,G></li>
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<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>S</code> - source type, can be anything</dd><dd><code>G</code> - aggregate type, can be anything</dd></dl>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../com/amazon/carbonado/Cursor.html" title="interface in com.amazon.carbonado">Cursor</a><G></dd>
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<pre>public abstract class <span class="strong">GroupedCursor<S,G></span>
extends <a href="../../../../com/amazon/carbonado/cursor/AbstractCursor.html" title="class in com.amazon.carbonado.cursor">AbstractCursor</a><G></pre>
<div class="block">Abstract cursor for aggregation and finding distinct data. The source cursor
must be ordered in some fashion by the grouping properties. The arrangement of
properties must match, but it does not matter if they are ascending or
descending.</div>
<dl><dt><span class="strong">Author:</span></dt>
<dd>Brian S O'Neill</dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="../../../../com/amazon/carbonado/cursor/SortedCursor.html" title="class in com.amazon.carbonado.cursor"><code>SortedCursor</code></a></dd></dl>
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<th class="colFirst" scope="col">Modifier</th>
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<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html#GroupedCursor(com.amazon.carbonado.Cursor, java.lang.Class, java.lang.String...)">GroupedCursor</a></strong>(<a href="../../../../com/amazon/carbonado/Cursor.html" title="interface in com.amazon.carbonado">Cursor</a><<a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html" title="type parameter in GroupedCursor">S</a>> cursor,
java.lang.Class<<a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html" title="type parameter in GroupedCursor">S</a>> type,
java.lang.String... groupProperties)</code>
<div class="block">Create a GroupedCursor using properties to define the group
comparator.</div>
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<tr class="rowColor">
<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html#GroupedCursor(com.amazon.carbonado.Cursor, java.util.Comparator)">GroupedCursor</a></strong>(<a href="../../../../com/amazon/carbonado/Cursor.html" title="interface in com.amazon.carbonado">Cursor</a><<a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html" title="type parameter in GroupedCursor">S</a>> cursor,
java.util.Comparator<<a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html" title="type parameter in GroupedCursor">S</a>> groupComparator)</code>
<div class="block">Create a GroupedCursor with an existing group comparator.</div>
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<td class="colFirst"><code>protected abstract void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html#addToGroup(S)">addToGroup</a></strong>(<a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html" title="type parameter in GroupedCursor">S</a> groupMember)</code>
<div class="block">This method is called when more entries are found for the current
group.</div>
</td>
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<td class="colFirst"><code>protected abstract void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html#beginGroup(S)">beginGroup</a></strong>(<a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html" title="type parameter in GroupedCursor">S</a> groupLeader)</code>
<div class="block">This method is called for the first entry in a group.</div>
</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html#close()">close</a></strong>()</code>
<div class="block">Call close to release any resources being held by this cursor.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><code>java.util.Comparator<<a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html" title="type parameter in GroupedCursor">S</a>></code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html#comparator()">comparator</a></strong>()</code>
<div class="block">Returns the comparator used to identify group boundaries.</div>
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<td class="colFirst"><code>protected abstract <a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html" title="type parameter in GroupedCursor">G</a></code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html#finishGroup()">finishGroup</a></strong>()</code>
<div class="block">This method is called when a group is finished, and it can return an
aggregate.</div>
</td>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html#hasNext()">hasNext</a></strong>()</code>
<div class="block">Returns true if this cursor has more elements.</div>
</td>
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<tr class="altColor">
<td class="colFirst"><code><a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html" title="type parameter in GroupedCursor">G</a></code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html#next()">next</a></strong>()</code>
<div class="block">Returns the next element from this cursor.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html#skipNext(int)">skipNext</a></strong>(int amount)</code>
<div class="block">Skips forward by the specified amount of elements, returning the actual
amount skipped.</div>
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<h3>Methods inherited from class com.amazon.carbonado.cursor.<a href="../../../../com/amazon/carbonado/cursor/AbstractCursor.html" title="class in com.amazon.carbonado.cursor">AbstractCursor</a></h3>
<code><a href="../../../../com/amazon/carbonado/cursor/AbstractCursor.html#copyInto(java.util.Collection)">copyInto</a>, <a href="../../../../com/amazon/carbonado/cursor/AbstractCursor.html#copyInto(java.util.Collection, int)">copyInto</a>, <a href="../../../../com/amazon/carbonado/cursor/AbstractCursor.html#toList()">toList</a>, <a href="../../../../com/amazon/carbonado/cursor/AbstractCursor.html#toList(int)">toList</a></code></li>
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<h4>GroupedCursor</h4>
<pre>protected GroupedCursor(<a href="../../../../com/amazon/carbonado/Cursor.html" title="interface in com.amazon.carbonado">Cursor</a><<a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html" title="type parameter in GroupedCursor">S</a>> cursor,
java.util.Comparator<<a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html" title="type parameter in GroupedCursor">S</a>> groupComparator)</pre>
<div class="block">Create a GroupedCursor with an existing group comparator. The comparator
defines the ordering of the source cursor, and it should be a partial
odering. If group comparator defines a total ordering, then all groups
have one member.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>cursor</code> - source of elements which must be ordered properly</dd><dd><code>groupComparator</code> - comparator which defines ordering of source cursor</dd></dl>
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<h4>GroupedCursor</h4>
<pre>protected GroupedCursor(<a href="../../../../com/amazon/carbonado/Cursor.html" title="interface in com.amazon.carbonado">Cursor</a><<a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html" title="type parameter in GroupedCursor">S</a>> cursor,
java.lang.Class<<a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html" title="type parameter in GroupedCursor">S</a>> type,
java.lang.String... groupProperties)</pre>
<div class="block">Create a GroupedCursor using properties to define the group
comparator. The set of properties defines the ordering of the source
cursor, and it should be a partial ordering. If properties define a
total ordering, then all groups have one member.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>cursor</code> - source of elements which must be ordered properly</dd><dd><code>type</code> - type of storable to create cursor for</dd><dd><code>groupProperties</code> - list of properties to group by</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.IllegalArgumentException</code> - if any property is null or not a member
of storable type</dd></dl>
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<h4>comparator</h4>
<pre>public java.util.Comparator<<a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html" title="type parameter in GroupedCursor">S</a>> comparator()</pre>
<div class="block">Returns the comparator used to identify group boundaries.</div>
</li>
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<a name="beginGroup(java.lang.Object)">
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<h4>beginGroup</h4>
<pre>protected abstract void beginGroup(<a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html" title="type parameter in GroupedCursor">S</a> groupLeader)
throws <a href="../../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a></pre>
<div class="block">This method is called for the first entry in a group. This method is not
called again until after finishGroup is called.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>groupLeader</code> - first entry in group</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a></code></dd></dl>
</li>
</ul>
<a name="addToGroup(java.lang.Object)">
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<h4>addToGroup</h4>
<pre>protected abstract void addToGroup(<a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html" title="type parameter in GroupedCursor">S</a> groupMember)
throws <a href="../../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a></pre>
<div class="block">This method is called when more entries are found for the current
group. This method is not called until after beginGroup has been
called. It may called multiple times until finishGroup is called.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>groupMember</code> - additional entry in group</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a></code></dd></dl>
</li>
</ul>
<a name="finishGroup()">
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<h4>finishGroup</h4>
<pre>protected abstract <a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html" title="type parameter in GroupedCursor">G</a> finishGroup()
throws <a href="../../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a></pre>
<div class="block">This method is called when a group is finished, and it can return an
aggregate. Simply return null if aggregate should be filtered out.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>aggregate, or null to filter it out</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a></code></dd></dl>
</li>
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<h4>close</h4>
<pre>public void close()
throws <a href="../../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a></pre>
<div class="block"><strong>Description copied from interface: <code><a href="../../../../com/amazon/carbonado/Cursor.html#close()">Cursor</a></code></strong></div>
<div class="block">Call close to release any resources being held by this cursor. Further
operations on this cursor will behave as if there are no results.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a></code></dd></dl>
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<h4>hasNext</h4>
<pre>public boolean hasNext()
throws <a href="../../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a></pre>
<div class="block"><strong>Description copied from interface: <code><a href="../../../../com/amazon/carbonado/Cursor.html#hasNext()">Cursor</a></code></strong></div>
<div class="block">Returns true if this cursor has more elements. In other words, returns
true if <a href="../../../../com/amazon/carbonado/Cursor.html#next()"><code>next</code></a> would return an element rather than throwing
an exception.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a></code> - if storage layer throws an exception</dd></dl>
</li>
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<h4>next</h4>
<pre>public <a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html" title="type parameter in GroupedCursor">G</a> next()
throws <a href="../../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a></pre>
<div class="block"><strong>Description copied from interface: <code><a href="../../../../com/amazon/carbonado/Cursor.html#next()">Cursor</a></code></strong></div>
<div class="block">Returns the next element from this cursor. This method may be called
repeatedly to iterate through the results.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a></code> - if storage layer throws an exception</dd></dl>
</li>
</ul>
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<h4>skipNext</h4>
<pre>public int skipNext(int amount)
throws <a href="../../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a></pre>
<div class="block"><strong>Description copied from interface: <code><a href="../../../../com/amazon/carbonado/Cursor.html#skipNext(int)">Cursor</a></code></strong></div>
<div class="block">Skips forward by the specified amount of elements, returning the actual
amount skipped. The actual amount is less than the requested amount only
if the end of the results was reached.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/amazon/carbonado/Cursor.html#skipNext(int)">skipNext</a></code> in interface <code><a href="../../../../com/amazon/carbonado/Cursor.html" title="interface in com.amazon.carbonado">Cursor</a><<a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html" title="type parameter in GroupedCursor">G</a>></code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../com/amazon/carbonado/cursor/AbstractCursor.html#skipNext(int)">skipNext</a></code> in class <code><a href="../../../../com/amazon/carbonado/cursor/AbstractCursor.html" title="class in com.amazon.carbonado.cursor">AbstractCursor</a><<a href="../../../../com/amazon/carbonado/cursor/GroupedCursor.html" title="type parameter in GroupedCursor">G</a>></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>amount</code> - maximum amount of elements to skip</dd>
<dt><span class="strong">Returns:</span></dt><dd>actual amount skipped</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a></code> - if storage layer throws an exception</dd></dl>
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