com.sun.jersey.api.wadl.config.WadlGeneratorConfig Maven / Gradle / Ivy
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package com.sun.jersey.api.wadl.config;
import java.io.File;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import com.sun.jersey.api.core.ResourceConfig;
import com.sun.jersey.server.wadl.WadlGenerator;
/**
* Provides a configured {@link WadlGenerator} with all decorations (the default
* wadl generator decorated by other generators).
*
* Creating a WadlGeneratorConfig
*
* If you want to create an instance at runtime you have two options:
*
* - Configure the WadlGenerator class and property names/values
* - Create your {@link WadlGenerator} instances by yourself
*
*
* The first option would look like this:
* WadlGeneratorConfig config = WadlGeneratorConfig
.generator( MyWadlGenerator.class )
.prop( "someProperty", "someValue" )
.generator( MyWadlGenerator2.class )
.prop( "someProperty", "someValue" )
.prop( "anotherProperty", "anotherValue" )
.build();
*
*
* The second option, creating the {@link WadlGenerator}s by yourself, would look like the following:
* WadlGeneratorConfig config = WadlGeneratorConfig
.generator( generator )
.generator( generator2 )
.build();
*
*
* If you want to specify the {@link WadlGeneratorConfig} in the web.xml you have
* to subclass it and set the servlet init-param {@link ResourceConfig#PROPERTY_WADL_GENERATOR_CONFIG}
* to the name of your subclass. This class might look like this:
* class MyWadlGeneratorConfig extends WadlGeneratorConfig {
&Override
public List configure() {
return generator( MyWadlGenerator.class )
.prop( "foo", propValue )
.generator( MyWadlGenerator2.class )
.prop( "bar", propValue2 )
.descriptions();
}
}
*
*
*
*
*
* Configuring the WadlGenerator
*
* The {@link WadlGenerator} properties will be populated with the provided properties like this:
*
* - The types match exactly:
* if the WadlGenerator property is of type org.example.Foo and the
* provided property value is of type org.example.Foo
* - Types that provide a constructor for the provided type (mostly java.lang.String)
* - The WadlGenerator property is of type {@link File} and the provided property value is a {@link String}:
* the provided property value can contain the prefix classpath: to denote, that the
* path to the file is relative to the classpath. In this case, the property value is stripped by
* the prefix classpath: and the {@link File} is created via
* new File( generator.getClass().getResource( strippedFilename ).toURI() )
* Notice that the filename is loaded from the classpath in this case, e.g. classpath:test.xml
* refers to a file in the package of the class ({@link WadlGeneratorDescription#getGeneratorClass()}). The
* file reference classpath:/test.xml refers to a file that is in the root of the classpath.
*
* - java.io.InputStream: The {@link InputStream} can e.g. represent a file. The stream is loaded from the
* property value (provided by the {@link WadlGeneratorDescription}) via
* {@link ClassLoader#getResourceAsStream(String)}. It will be closed after {@link WadlGenerator#init()} was called.
*
*
*
*
* @author Martin Grotzke
* @version $Id$
*/
public abstract class WadlGeneratorConfig {
// private static final Logger LOGGER = Logger.getLogger( WadlGeneratorConfig.class.getName() );
private WadlGenerator _wadlGenerator;
public WadlGeneratorConfig() {
}
/**
* Creates a new WadlGeneratorConfig from the provided wadlGenerator (must already be initialized).
* @param wadlGenerator the wadl generator to provide, must not be null.
*/
public WadlGeneratorConfig( WadlGenerator wadlGenerator ) {
if ( wadlGenerator == null ) {
throw new IllegalArgumentException( "The wadl generator must not be null." );
}
_wadlGenerator = wadlGenerator;
}
public abstract List configure();
/**
* @return the wadlGeneratorDescriptions
*/
public synchronized WadlGenerator getWadlGenerator() {
if ( _wadlGenerator == null ) {
final List wadlGeneratorDescriptions = configure();
try {
_wadlGenerator = WadlGeneratorLoader.loadWadlGeneratorDescriptions( wadlGeneratorDescriptions );
} catch ( Exception e ) {
throw new RuntimeException( "Could not load wadl generators from wadlGeneratorDescriptions.", e );
}
}
return _wadlGenerator;
}
/**
* Start to build an instance of {@link WadlGeneratorConfig}:
* generator(<class>)
* .prop(<name>, <value>)
* .prop(<name>, <value>)
* .generator(<class>)
* .prop(<name>, <value>)
* .prop(<name>, <value>)
* .build()
* @param generatorClass the class of the wadl generator to configure
* @return an instance of {@link WadlGeneratorConfigDescriptionBuilder}.
*/
public static WadlGeneratorConfigDescriptionBuilder generator( Class generatorClass ) {
return new WadlGeneratorConfigDescriptionBuilder().generator( generatorClass );
}
/**
* Start to build an instance of {@link WadlGeneratorConfig}:
* generator(<generator>).generator(<generator>).build()
* @param generator the configured wadl generator
* @return an instance of {@link WadlGeneratorConfigBuilder}.
*/
public static WadlGeneratorConfigBuilder generator( WadlGenerator generator ) {
return new WadlGeneratorConfigBuilder().generator( generator );
}
public static class WadlGeneratorConfigDescriptionBuilder {
private List _descriptions;
private WadlGeneratorDescription _description;
public WadlGeneratorConfigDescriptionBuilder() {
_descriptions = new ArrayList();
}
public WadlGeneratorConfigDescriptionBuilder generator( Class generatorClass ) {
if ( _description != null ) {
_descriptions.add( _description );
}
_description = new WadlGeneratorDescription();
_description.setGeneratorClass( generatorClass );
return this;
}
/**
* Specify the property value for the current {@link WadlGenerator}.
*
* The {@link WadlGenerator} property can be of type {@link String}, {@link File}, {@link InputStream}
* or any type that provides a {@link String} constructor.
*
*
* If the {@link WadlGenerator} property is of type {@link File}, then the specified property value can start with the
* prefix classpath: to denote, that the File shall be loaded from the classpath like this:
*
new File( generator.getClass().getResource( strippedFilename ).toURI() )
* Notice that the file is loaded as a resource from the classpath in this case, therefore classpath:test.xml
* refers to a file in the package of the specified <classname>. The
* file reference classpath:/test.xml refers to a file that is in the root of the classpath.
*
*
* If the {@link WadlGenerator} property is of type {@link InputStream}, then the specified property value
* is loaded with {@link ClassLoader#getResourceAsStream(String)} using the current threads context classloader.
* The {@link InputStream} will be closed after {@link WadlGenerator#init()} was called and therefore must not be closed
* by the {@link WadlGenerator} using this stream.
*
* @param propName the property name
* @param propValue the stringified property value
* @return this builder instance
*/
public WadlGeneratorConfigDescriptionBuilder prop( String propName, String propValue ) {
if ( _description.getProperties() == null ) {
_description.setProperties( new Properties() );
}
_description.getProperties().put( propName, propValue );
return this;
}
public List descriptions() {
if ( _description != null ) {
_descriptions.add( _description );
}
return _descriptions;
}
public WadlGeneratorConfig build() {
if ( _description != null ) {
_descriptions.add( _description );
}
return new WadlGeneratorConfigImpl( _descriptions );
}
}
static class WadlGeneratorConfigImpl extends WadlGeneratorConfig {
public List _descriptions;
public WadlGeneratorConfigImpl(
List descriptions) {
_descriptions = descriptions;
}
@Override
public List configure() {
return _descriptions;
}
}
public static class WadlGeneratorConfigBuilder {
private List _generators;
public WadlGeneratorConfigBuilder() {
_generators = new ArrayList();
}
public WadlGeneratorConfigBuilder generator( WadlGenerator generator ) {
if ( generator == null ) {
throw new IllegalArgumentException( "The wadl generator must not be null." );
}
_generators.add( generator );
return this;
}
public WadlGeneratorConfig build() {
try {
final WadlGenerator wadlGenerator = WadlGeneratorLoader.loadWadlGenerators( _generators );
return new WadlGeneratorConfigGeneratorImpl( wadlGenerator ) {
};
} catch ( Exception e ) {
throw new RuntimeException( "Could not load wadl generators.", e );
}
}
}
static class WadlGeneratorConfigGeneratorImpl extends WadlGeneratorConfig {
private final WadlGenerator _wadlGenerator;
public WadlGeneratorConfigGeneratorImpl(WadlGenerator wadlGenerator) {
_wadlGenerator = wadlGenerator;
}
@Override
public List configure() {
throw new UnsupportedOperationException( "Must not be called" );
}
/* (non-Javadoc)
* @see com.sun.jersey.server.impl.wadl.config.WadlGeneratorConfig#getWadlGenerator()
*/
@Override
public synchronized WadlGenerator getWadlGenerator() {
return _wadlGenerator;
}
}
}