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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
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<head>
<title>Example 1: Default code generation</title>
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<td><h1>Example 1: Default code generation</h1>
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</div>
</td>
<td>
<div id="bodycol">
<div class="app">
<div class="h3">
<h3><a name="start"></a>CodeGen default code generation</h3>
<p>You can use the Ant 'codegen' target to generate code from the schema using the
CodeGen default settings. Here's the actual 'codegen' target from the <i>build.xml</i>:</p>
<div id="source"><pre> <!-- generate using default settings -->
<target name="codegen" depends="check-runtime,clean">
<echo message="Running code generation from schema"/>
<java classname="org.jibx.schema.codegen.CodeGen" fork="yes"
classpathref="classpath" failonerror="true">
<arg value="-t"/>
<arg value="gen/src"/>
<arg value="otasubset/OTA_AirLowFareSearch*.xsd"/>
</java>
</target>
</pre></div>
<p>This passes the '-t' parameter to CodeGen with the value 'gen/src' to tell it the
target generation directory. The third argument value tells CodeGen to use schemas from
the <i>otasubset</i> directory with names matching the pattern "OTA_AirLowFareSearch*.xsd"
as input for code generation. You can specify as many schema names or schema name patterns
as you want when running CodeGen, but must have at least one - otherwise there's nothing for
CodeGen to generate!</p>
</div>
<div class="h3">
<a name="code"></a><h3>Generated code</h3>
<p>Run the 'codegen' target and see the <i>gen/src</i> directory. (You can also use the
'full' target to generate and compile the code, run the binding compiler, and finally run
a supplied test program which roundtrips the sample documents from the <i>samples</i>
directory.)</p>
<p>CodeGen's default behavior is to derive the package used for generated code from the
schema namespace URI. In this case, the schema namespace is
<code>http://www.opentravel.org/OTA/2003/05</code> (only the <i>OTA_AirLowFareSearchRQ.xsd</i>
and <i>OTA_AirLowFareSearchRS.xsd</i> schemas actually define this target namespace, but
the other schemas assume that namespace by being included into these two schemas, either
directly or indirectly). To derive a package from the namespace, first the entire URI is
converted to lowercase. Next the <code>http://www.</code> part is stripped, then the
remaining components of the authority (host name) are converted to lowercase and
reverse-ordered. This gives <code>org.opentravel</code>. Finally, the remaining path
components are processed. Characters in the path component which are not valid Java name
characters are discarded. This include any path components consisting only of digits, so
the only component that gets used in the package name is <code>OTA</code>. The final
package name is <code>org.opentravel.ota</code>.</p>
<p>The generated classes in this case directly model the schema (with the exception of
xs:union simpleTypes - xs:union is currently not supported directly, instead using a
simple <code>String</code> value as the most general representation). CodeGen was only
asked to generate two schema documents, <i>OTA_AirLowFareSearchRQ.xsd</i> and
<i>OTA_AirLowFareSearchRS.xsd</i> - but these schemas include the other schemas in the
supplied OTA subset, either directly or indirectly. Unless you tell it otherwise, CodeGen
generates every definition (with the exception of xs:attributeGroup and xs:group definitions
which are only referenced once) in each schema, since in the general case all these
definitions are necessary. This does create a lot of classes, though; in this case, 261
top-level classes and an additional 153 inner classes, for a total of 414 classes.</p>
<p>If you look at the generated Java class files, you'll see that each class definition
starts with a JavaDoc comment giving first the documentation from the schema component
matching the Java class, and then the schema fragment matching the class definition.
This schema fragment is from a normalized version of the schema generated after type
substitutions and inlining (the latter not a factor with the default generation used in
this example), stripping annotations, and simplifications from eliminating schema
components not handled by CodeGen (such as xs:unions - currently handled just as
<code>String</code> values - and xs:restriction facets other than xs:enumeration).</p>
<p>Here's a sample of the generated code (reformated for a reasonable page width),
showing portions of the two main classes used for the response message:</p>
<div id="source"><pre>/**
*
The Low Fare Search Response message contains a number of 'Priced Itinerary'
options. Each includes:
- A set of available flights matching the client's request.
- Pricing information including taxes and full fare breakdown for each passenger
type
- Ticketing information
- Fare Basis Codes and the information necessary to make a rules entry.
This message contains similar information to a standard airline CRS or GDS Low
Fare Search Response message.
*
* Schema fragment(s) for this class:
* <pre>
* &lt;xs:element xmlns:ns="http://www.opentravel.org/OTA/2003/05"
xmlns:xs="http://www.w3.org/2001/XMLSchema" name="OTA_AirLowFareSearchRS">
* &lt;xs:complexType>
* &lt;xs:sequence>
* &lt;xs:choice>
* &lt;xs:sequence>
* &lt;xs:element type="ns:SuccessType" name="Success"/>
* &lt;xs:element type="ns:WarningsType" name="Warnings"
minOccurs="0"/>
* &lt;xs:element type="ns:PricedItinerariesType"
name="PricedItineraries"/>
* &lt;/xs:sequence>
* &lt;xs:element type="ns:ErrorsType" name="Errors"/>
* &lt;/xs:choice>
* &lt;/xs:sequence>
* &lt;xs:attributeGroup ref="ns:OTA_PayloadStdAttributes"/>
* &lt;/xs:complexType>
* &lt;/xs:element>
* </pre>
*/
public class OTAAirLowFareSearchRS
{
private int choiceSelect = -1;
private static final int SUCCESS_CHOICE = 0;
private static final int ERRORS_CHOICE = 1;
private SuccessType success;
private WarningsType warnings;
private PricedItinerariesType pricedItineraries;
private ErrorsType errors;
private OTAPayloadStdAttributes OTAPayloadStdAttributes;
private void setChoiceSelect(int choice) {
if (choiceSelect == -1) {
choiceSelect = choice;
} else if (choiceSelect != choice) {
throw new IllegalStateException(
"Need to call clearChoiceSelect() before changing existing choice");
}
}
/**
* Clear the choice selection.
*/
public void clearChoiceSelect() {
choiceSelect = -1;
}
/**
* Check if Success is current selection for choice.
*
* @return <code>true</code> if selection, <code>false</code> if not
*/
public boolean ifSuccess() {
return choiceSelect == SUCCESS_CHOICE;
}
/**
* Get the 'Success' element value. Success
Standard way to indicate successful processing of an OTA message. Returning an
empty element of this type indicates success.
*
* @return value
*/
public SuccessType getSuccess() {
return success;
}
/**
* Set the 'Success' element value. Success
Standard way to indicate successful processing of an OTA message. Returning an
empty element of this type indicates success.
*
* @param success
*/
public void setSuccess(SuccessType success) {
setChoiceSelect(SUCCESS_CHOICE);
this.success = success;
}
/**
* Get the 'Warnings' element value. Standard way to indicate successful
processing of an OTA message, but one in which warnings are generated.
*
* @return value
*/
public WarningsType getWarnings() {
return warnings;
}
/**
* Set the 'Warnings' element value. Standard way to indicate successful
processing of an OTA message, but one in which warnings are generated.
*
* @param warnings
*/
public void setWarnings(WarningsType warnings) {
setChoiceSelect(SUCCESS_CHOICE);
this.warnings = warnings;
}
/**
* Get the 'PricedItineraries' element value. Successfull Low Fare priced
itineraries in response to a Low Fare Search request.
*
* @return value
*/
public PricedItinerariesType getPricedItineraries() {
return pricedItineraries;
}
/**
* Set the 'PricedItineraries' element value. Successfull Low Fare priced
itineraries in response to a Low Fare Search request.
*
* @param pricedItineraries
*/
public void setPricedItineraries(PricedItinerariesType pricedItineraries) {
setChoiceSelect(SUCCESS_CHOICE);
this.pricedItineraries = pricedItineraries;
}
...
}
/**
* Container for priced itineraries.
*
* Schema fragment(s) for this class:
* <pre>
* &lt;xs:complexType xmlns:ns="http://www.opentravel.org/OTA/2003/05"
xmlns:xs="http://www.w3.org/2001/XMLSchema" name="PricedItinerariesType">
* &lt;xs:sequence>
* &lt;xs:element name="PricedItinerary" maxOccurs="unbounded">
* &lt;!-- Reference to inner class PricedItinerary -->
* &lt;/xs:element>
* &lt;/xs:sequence>
* &lt;/xs:complexType>
* </pre>
*/
public class PricedItinerariesType
{
private List<PricedItinerary> pricedItineraryList =
new ArrayList<PricedItinerary>();
/**
* Get the list of 'PricedItinerary' element items.
*
* @return list
*/
public List<PricedItinerary> getPricedItineraryList() {
return pricedItineraryList;
}
/**
* Set the list of 'PricedItinerary' element items.
*
* @param list
*/
public void setPricedItineraryList(List<PricedItinerary> list) {
pricedItineraryList = list;
}
/**
* Itinerary with pricing information.
*
* Schema fragment(s) for this class:
* <pre>
* &lt;xs:element xmlns:ns="http://www.opentravel.org/OTA/2003/05"
xmlns:xs="http://www.w3.org/2001/XMLSchema" name="PricedItinerary"
maxOccurs="unbounded">
* &lt;xs:complexType>
* &lt;xs:complexContent>
* &lt;xs:extension base="ns:PricedItineraryType">
* &lt;xs:attribute type="xs:integer" use="optional"
name="OriginDestinationRefNumber"/>
* &lt;/xs:extension>
* &lt;/xs:complexContent>
* &lt;/xs:complexType>
* &lt;/xs:element>
* </pre>
*/
public static class PricedItinerary extends PricedItineraryType
{
private BigInteger originDestinationRefNumber;
/**
* Get the 'OriginDestinationRefNumber' attribute value. This attribute
refers back to origin destination information in the OTA_AirLowFareSearchRQ
message.
*
* @return value
*/
public BigInteger getOriginDestinationRefNumber() {
return originDestinationRefNumber;
}
/**
* Set the 'OriginDestinationRefNumber' attribute value. This attribute
refers back to origin destination information in the OTA_AirLowFareSearchRQ
message.
*
* @param originDestinationRefNumber
*/
public void setOriginDestinationRefNumber(
BigInteger originDestinationRefNumber) {
this.originDestinationRefNumber = originDestinationRefNumber;
}
}
}</pre></div>
<p>The above code sample illustrates several aspects of the default code generation.
The <code>OTAAirLowFareSearchRS</code> class represents an <OTA_AirLowFareSearchRS>
element, with a schema structure consisting of a choice between a sequence of a
<Success> element, an optional <Warnings> element, and a <PricedItineraries>
element, or an <Errors> element. The <OTA_AirLowFareSearchRS> element also has
a group of attributes named OTA_PayloadStdAttributes.</p>
<p>The choice between the sequence starting with the <Success> element and the
<Errors> element is represented in the Java code with an internal state variable.
The public methods <code>ifSuccess()</code> and <code>ifErrors()</code> allow you to
check the state currently set for an instance of the class, while any of the set
methods for values (<code>setSuccess()</code>, <code>setWarnings()</code>,'
<code>setPricedItineraries()</code>, and <code>setErrors()</code>) check the internal
state. If the state is not yet set when one of these methods is called, the state is
set to match the value. If the state is set to a conflicting choice, an
<code>IllegalStateException</code> is thrown. There's also a <code>clearChoiceSelect()</code>
method which allows you to clear the current state. These methods all work together
to enforce the semantics of the choice structure of the schema definition. There are
other options for the details of how choices are implemented, though - see the
<a href="codegen-customs.html#choice-exposed">choice-exposed</a> and
<a href="codegen-customs.html#choice-handling">choice-handling</a> customization attributes.</p>
<p>The <code>PricedItinerariesType</code> class shows the default handling for repeated
values, as a Java 5 typed collection with simple get/set access methods. As with the
choice handling, you can use customizations to change the list handling - see the
<a href="codegen-customs.html#repeated-type">repeated-type</a> customization, which is used in
<a href="example-custom2.html">Example 3: More extensive customizations</a> to change the
generated code to use arrays rather than lists. If you stay with lists (either using the
Java 5 typed default, or untyped lists compatible with older versions of Java) you can
add convenience methods to the list handling using a
<a href="codegen-extends.html#extend"><class-decorator> customization</a> referencing the
<code>org.jibx.schema.codegen.extend.CollectionMethodsDecorator</code>.</p>
<p>You can also see from the code listing how CodeGen uses schema documentation components
in creating class and method JavaDocs. The class JavaDoc begins with any documentation
for the corresponding schema component (see <a href="codegen-customs.html#import-docs">import-docs</a>),
followed by the actual schema fragment matching the class (see
<a href="codegen-customs.html#show-schema">show-schema</a> and
<a href="codegen-customs.html#delete-annotations">delete-annotations</a>). The get/set access
methods for each value in a class describe the schema equivalent of the value (as an
element or attribute name) in the first sentence, followed by any schema documentation
provided for that element or attribute (again controlled by
<a href="codegen-customs.html#import-docs">import-docs</a>).</p>
<p>Next: <a href="example-custom1.html">Example 2: Generating only the required classes</a></p>
</div>
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