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<title>Berkeley DB Reference Guide: Tuple - Using sorted collections</title>
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<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Java API Tutorial - Tuple</dl></h3></td>
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<p>
<h3 align=center>Tuple - Using sorted collections</h3>
<p>In general, no changes to the prior example are necessary to use
collections having tuple keys.  Iteration of elements in a stored collection
will be ordered by the sort order of the tuples.  In addition to using the
tuple format, the 
<a href="../../java/com/sleepycat/db/Db.html#DB_BTREE">Db.DB_BTREE</a>
 access method
must be used when creating the database.  
<a href="../../java/com/sleepycat/db/Db.html#DB_BTREE">Db.DB_BTREE</a>
is used for the databases in all examples.  The
<a href="../../java/com/sleepycat/db/Db.html#DB_HASH">Db.DB_HASH</a>
 access method does not support
sorted keys.</p>
<p>Although not shown in the example, all methods of the
<a href="http://java.sun.com/j2se/1.3/docs/api/java/util/SortedMap.html">SortedMap</a>
 and 
<a href="http://java.sun.com/j2se/1.3/docs/api/java/util/SortedSet.html">SortedSet</a>
interfaces may be used with sorted collections.  For example, submaps and
subsets may be created.</p>
<hr size=1 noshade>
<p>To create a sorted collection, the
<a href="../../java/com/sleepycat/bdb/collection/StoredSortedMap.html">StoredSortedMap</a>
 class is
used instead of 
<a href="../../java/com/sleepycat/bdb/collection/StoredMap.html">StoredMap</a>
.</p>
<blockquote><pre>
<b>import com.sleepycat.bdb.collection.StoredSortedMap;
...
</b>public class SampleViews
{
    private <b>StoredSortedMap</b> partMap;
    private <b>StoredSortedMap</b> supplierMap;
    private <b>StoredSortedMap</b> shipmentMap;
    private <b>StoredSortedMap</b> shipmentByPartMap;
    private <b>StoredSortedMap</b> shipmentBySupplierMap;
    private <b>StoredSortedMap</b> supplierByCityMap;
    ...
    public SampleViews(SampleDatabase db)
    {
        ...
        partMap =
            new <b>StoredSortedMap</b>(db.getPartStore(),
                          partKeyBinding, partValueBinding, true);
        supplierMap =
            new <b>StoredSortedMap</b>(db.getSupplierStore(),
                          supplierKeyBinding, supplierValueBinding, true);
        shipmentMap =
            new <b>StoredSortedMap</b>(db.getShipmentStore(),
                          shipmentKeyBinding, shipmentValueBinding, true);
        shipmentByPartMap =
            new <b>StoredSortedMap</b>(db.getShipmentByPartIndex(),
                          partKeyBinding, shipmentValueBinding, true);
        shipmentBySupplierMap =
            new <b>StoredSortedMap</b>(db.getShipmentBySupplierIndex(),
                          supplierKeyBinding, shipmentValueBinding, true);
        supplierByCityMap =
            new <b>StoredSortedMap</b>(db.getSupplierByCityIndex(),
                          cityKeyBinding, supplierValueBinding, true);
    }
}
</pre></blockquote>
<hr size=1 noshade>
<p>The getter methods of <b>SampleViews</b> also return
<a href="../../java/com/sleepycat/bdb/collection/StoredSortedMap.html">StoredSortedMap</a>
and, as a convenience,
<a href="../../java/com/sleepycat/bdb/collection/StoredSortedValueSet.html">StoredSortedValueSet</a>
.</p>
<blockquote><pre>
<b>import com.sleepycat.bdb.collection.StoredSortedMap;
import com.sleepycat.bdb.collection.StoredSortedValueSet;
...
</b>public class SampleViews
{
    ...
    public <b>StoredSortedMap</b> getPartMap()
    {
        return partMap;
    }
<p>
    public <b>StoredSortedMap</b> getSupplierMap()
    {
        return supplierMap;
    }
<p>
    public <b>StoredSortedMap</b> getShipmentMap()
    {
        return shipmentMap;
    }
<p>
    public <b>StoredSortedValueSet</b> getPartSet()
    {
        return (<b>StoredSortedValueSet</b>) partMap.values();
    }
<p>
    public <b>StoredSortedValueSet</b> getSupplierSet()
    {
        return (<b>StoredSortedValueSet</b>) supplierMap.values();
    }
<p>
    public <b>StoredSortedValueSet</b> getShipmentSet()
    {
        return (<b>StoredSortedValueSet</b>) shipmentMap.values();
    }
<p>
    public <b>StoredSortedMap</b> getShipmentByPartMap()
    {
        return shipmentByPartMap;
    }
<p>
    public <b>StoredSortedMap</b> getShipmentBySupplierMap()
    {
        return shipmentBySupplierMap;
    }
<p>
    public final <b>StoredSortedMap</b> getSupplierByCityMap()
    {
        return supplierByCityMap;
    }
    ...
}
</pre></blockquote>
<hr size=1 noshade>
<p>The output of the example program shows that records are sorted by key
value.</p>
<blockquote><pre>
Adding Suppliers
Adding Parts
Adding Shipments
<p>
--- Parts ---
Part: number=P1 name=Nut color=Red weight=[12.0 grams] city=London
Part: number=P2 name=Bolt color=Green weight=[17.0 grams] city=Paris
Part: number=P3 name=Screw color=Blue weight=[17.0 grams] city=Rome
Part: number=P4 name=Screw color=Red weight=[14.0 grams] city=London
Part: number=P5 name=Cam color=Blue weight=[12.0 grams] city=Paris
Part: number=P6 name=Cog color=Red weight=[19.0 grams] city=London
<p>
--- Suppliers ---
Supplier: number=S1 name=Smith status=20 city=London
Supplier: number=S2 name=Jones status=10 city=Paris
Supplier: number=S3 name=Blake status=30 city=Paris
Supplier: number=S4 name=Clark status=20 city=London
Supplier: number=S5 name=Adams status=30 city=Athens
<p>
--- Suppliers for City Paris ---
Supplier: number=S2 name=Jones status=10 city=Paris
Supplier: number=S3 name=Blake status=30 city=Paris
<p>
--- Shipments ---
Shipment: part=P1 supplier=S1 quantity=300
Shipment: part=P1 supplier=S2 quantity=300
Shipment: part=P2 supplier=S1 quantity=200
Shipment: part=P2 supplier=S2 quantity=400
Shipment: part=P2 supplier=S3 quantity=200
Shipment: part=P2 supplier=S4 quantity=200
Shipment: part=P3 supplier=S1 quantity=400
Shipment: part=P4 supplier=S1 quantity=200
Shipment: part=P4 supplier=S4 quantity=300
Shipment: part=P5 supplier=S1 quantity=100
Shipment: part=P5 supplier=S4 quantity=400
Shipment: part=P6 supplier=S1 quantity=100
<p>
--- Shipments for Part P1 ---
Shipment: part=P1 supplier=S1 quantity=300
Shipment: part=P1 supplier=S2 quantity=300
<p>
--- Shipments for Supplier S1 ---
Shipment: part=P1 supplier=S1 quantity=300
Shipment: part=P2 supplier=S1 quantity=200
Shipment: part=P3 supplier=S1 quantity=400
Shipment: part=P4 supplier=S1 quantity=200
Shipment: part=P5 supplier=S1 quantity=100
Shipment: part=P6 supplier=S1 quantity=100
</pre></blockquote>
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