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Creating Tuple Key Bindings
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Creating Tuple Key Bindings
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<td width="20%" align="left"><a accesskey="p" href="tupleswithkeycreators.html">Prev</a> </td>
<th width="60%" align="center">Chapter 5. 
Using Tuples
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<h2 class="title" style="clear: both"><a id="tuplekeybindings"></a>
Creating Tuple Key Bindings
</h2>
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<p>
Serial bindings were used in prior examples as key bindings, and
keys were stored as serialized objects. In this example, a tuple
binding is used for each key since keys will be stored as tuples.
Because keys are no longer stored as serialized objects, the
<tt class="classname">PartKey</tt>, <tt class="classname">SupplierKey</tt> and <tt class="classname">ShipmentKey</tt> classes
no longer implement the
<a href="http://java.sun.com/j2se/1.5.0/docs/api/java/io/Serializable.html" target="_top">Serializable</a>
interface (this is the only change to these classes and is not
shown below).
</p>
<p>
For the <tt class="classname">Part</tt> key, <tt class="classname">Supplier</tt> key,
and <tt class="classname">Shipment</tt> key, the
<tt class="classname">SampleViews</tt> class was changed in this example to create a
custom
<a href="../../java/com/sleepycat/bind/tuple/TupleBinding.html" target="_top">TupleBinding</a>
instead of a
<a href="../../java/com/sleepycat/bind/serial/SerialBinding.html" target="_top">SerialBinding</a>.
The custom tuple key binding classes are defined further below.
</p>
<a id="tuple_sampleviews"></a>
<pre class="programlisting"><b class="userinput"><tt>import com.sleepycat.bind.tuple.TupleBinding;
...</tt></b>
public class SampleViews
{
...
public SampleViews(SampleDatabase db)
{
...
ClassCatalog catalog = db.getClassCatalog();
<b class="userinput"><tt> EntryBinding partKeyBinding =
new PartKeyBinding();
EntityBinding partDataBinding =
new PartBinding(catalog, PartData.class);
EntryBinding supplierKeyBinding =
new SupplierKeyBinding();
EntityBinding supplierDataBinding =
new SupplierBinding(catalog, SupplierData.class);
EntryBinding shipmentKeyBinding =
new ShipmentKeyBinding();
EntityBinding shipmentDataBinding =
new ShipmentBinding(catalog, ShipmentData.class);
EntryBinding cityKeyBinding =
TupleBinding.getPrimitiveBinding(String.class);</tt></b>
...
}
} </pre>
<p>
For the City key, however, a custom binding class is not needed
because the key class is a primitive Java type,
<a href="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html" target="_top">String</a>.
For any primitive Java type, a tuple binding may be created using the
<a href="../../java/com/sleepycat/bind/tuple/TupleBinding.html#getPrimitiveBinding(java.lang.Class)" target="_top">TupleBinding.getPrimitiveBinding</a>
static method.
</p>
<p>
The custom key binding classes, <tt class="classname">PartKeyBinding</tt>,
<tt class="classname">SupplierKeyBinding</tt> and <tt class="classname">ShipmentKeyBinding</tt>, are
defined by extending the
<a href="../../java/com/sleepycat/bind/tuple/TupleBinding.html" target="_top">TupleBinding</a>
class. The
<a href="../../java/com/sleepycat/bind/tuple/TupleBinding.html" target="_top">TupleBinding</a>
abstract class implements the
<a href="../../java/com/sleepycat/bind/EntryBinding.html" target="_top">EntryBinding</a>
interface, and is used for one-to-one bindings between tuples and
objects. Each binding class implements two methods for converting
between tuples and objects. Tuple fields are read using the
<a href="../../java/com/sleepycat/bind/tuple/TupleInput.html" target="_top">TupleInput</a>
parameter and written using the
<a href="../../java/com/sleepycat/bind/tuple/TupleOutput.html" target="_top">TupleOutput</a>
parameter.
</p>
<a id="tuple_partkeybinding"></a>
<pre class="programlisting"><b class="userinput"><tt>import com.sleepycat.bind.tuple.TupleBinding;
import com.sleepycat.bind.tuple.TupleInput;
import com.sleepycat.bind.tuple.TupleOutput;
...</tt></b>
public class SampleViews
{
...
<b class="userinput"><tt>private static class PartKeyBinding extends TupleBinding
{
private PartKeyBinding()
{
}
public Object entryToObject(TupleInput input)
{
String number = input.readString();
return new PartKey(number);
}
public void objectToEntry(Object object, TupleOutput output)
{
PartKey key = (PartKey) object;
output.writeString(key.getNumber());
}
}
...
private static class SupplierKeyBinding extends TupleBinding
{
private SupplierKeyBinding()
{
}
public Object entryToObject(TupleInput input)
{
String number = input.readString();
return new SupplierKey(number);
}
public void objectToEntry(Object object, TupleOutput output)
{
SupplierKey key = (SupplierKey) object;
output.writeString(key.getNumber());
}
}
...
private static class ShipmentKeyBinding extends TupleBinding
{
private ShipmentKeyBinding()
{
}
public Object entryToObject(TupleInput input)
{
String partNumber = input.readString();
String supplierNumber = input.readString();
return new ShipmentKey(partNumber, supplierNumber);
}
public void objectToEntry(Object object, TupleOutput output)
{
ShipmentKey key = (ShipmentKey) object;
output.writeString(key.getPartNumber());
output.writeString(key.getSupplierNumber());
}
}</tt></b>
...
} </pre>
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Creating Tuple-Serial Entity Bindings
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