DATAREST-616 - Initial support to execute Querydsl predicates.

If Querydsl is on the classpath and the repository exposed implements QuerydslPredicateExecutor, we now register a component that customizes the RepositoryInvoker to route repository interactions for collection resource calls to the QuerydslPredicateExecutor.

The invocation gets enriched with a Predicate obtained from the request data. Bindings can be customized through the QuerydslBinderCustomizer interface implemented in a default method on the repository.

Tweaked the build to generate Querydsl meta-model classes for the MongoDB domain types.

spring-data-rest-webmvc/pom.xml

@@ -88,6 +88,15 @@
 			<artifactId>json-patch</artifactId>
 			<version>1.7</version>
 		</dependency>
+		
+		<!-- Querydsl -->
+		
+		<dependency>
+			<groupId>com.mysema.querydsl</groupId>
+			<artifactId>querydsl-core</artifactId>
+			<version>${querydsl}</version>
+			<optional>true</optional>
+		</dependency>
 
 		<!-- Optional store specifics -->
 
@@ -450,6 +459,33 @@
 					</execution>
 				</executions>
 			</plugin>
+
+			<plugin>
+				<groupId>com.mysema.maven</groupId>
+				<artifactId>apt-maven-plugin</artifactId>
+				<version>${apt}</version>
+				<dependencies>
+					<dependency>
+						<groupId>com.mysema.querydsl</groupId>
+						<artifactId>querydsl-apt</artifactId>
+						<version>${querydsl}</version>
+					</dependency>
+				</dependencies>
+				<executions>
+					<execution>
+						<phase>generate-test-sources</phase>
+						<goals>
+							<goal>test-process</goal>
+						</goals>
+						<configuration>
+							<outputDirectory>target/generated-sources/annotations</outputDirectory>
+							<processor>org.springframework.data.mongodb.repository.support.MongoAnnotationProcessor</processor>
+							<logOnlyOnError>true</logOnlyOnError>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
+
 		</plugins>
 	</build>