Add support for providing default Querydsl bindings.

We now consider default Querydsl bindings when registering a DefaultQuerydslBinderCustomizer bean. The default bindings are applied before applying type-specific bindings.

Closes #206.
Original Pull Request: #2292

src/main/asciidoc/repositories.adoc

@@ -1667,6 +1667,8 @@ interface UserRepository extends CrudRepository<User, String>,
 <5> Exclude the `password` property from `Predicate` resolution.
 ====
 
+Additionally, you can register a `DefaultQuerydslBinderCustomizer` bean to apply default Querydsl bindings before applying specific bindings from the repository or `@QuerydslPredicate`.
+
 [[core.repository-populators]]
 === Repository Populators
 

src/main/java/org/springframework/data/querydsl/binding/DefaultQuerydslBinderCustomizer.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2021 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.querydsl.binding;
+
+import com.querydsl.core.types.EntityPath;
+
+/**
+ * A component for {@link QuerydslBindings} customization acting as default customizer the given entity path regardless
+ * of the domain type. Instances can be registered with the application context to be applied.
+ *
+ * @author Mark Paluch
+ * @since 2.5
+ */
+public interface DefaultQuerydslBinderCustomizer extends QuerydslBinderCustomizer<EntityPath<?>> {}

src/main/java/org/springframework/data/querydsl/binding/QuerydslBindingsFactory.java

@@ -15,8 +15,10 @@
  */
 package org.springframework.data.querydsl.binding;
 
+import java.util.List;
 import java.util.Map;
 import java.util.Optional;
+import java.util.stream.Collectors;
 
 import org.springframework.beans.BeanUtils;
 import org.springframework.beans.BeansException;
@@ -37,6 +39,7 @@ import com.querydsl.core.types.EntityPath;
  *
  * @author Oliver Gierke
  * @author Christoph Strobl
+ * @author Mark Paluch
  * @since 1.11
  */
 public class QuerydslBindingsFactory implements ApplicationContextAware {
@@ -48,6 +51,7 @@ public class QuerydslBindingsFactory implements ApplicationContextAware {
 
 	private Optional<AutowireCapableBeanFactory> beanFactory;
 	private Optional<Repositories> repositories;
+	private QuerydslBinderCustomizer<EntityPath<?>> defaultCustomizer;
 
 	/**
 	 * Creates a new {@link QuerydslBindingsFactory} using the given {@link EntityPathResolver}.
@@ -62,6 +66,7 @@ public class QuerydslBindingsFactory implements ApplicationContextAware {
 		this.entityPaths = new ConcurrentReferenceHashMap<>();
 		this.beanFactory = Optional.empty();
 		this.repositories = Optional.empty();
+		this.defaultCustomizer = NoOpCustomizer.INSTANCE;
 	}
 
 	/*
@@ -73,6 +78,7 @@ public class QuerydslBindingsFactory implements ApplicationContextAware {
 
 		this.beanFactory = Optional.of(applicationContext.getAutowireCapableBeanFactory());
 		this.repositories = Optional.of(new Repositories(applicationContext));
+		this.defaultCustomizer = findDefaultCustomizer();
 	}
 
 	/**
@@ -126,6 +132,7 @@ public class QuerydslBindingsFactory implements ApplicationContextAware {
 		EntityPath<?> path = verifyEntityPathPresent(domainType);
 
 		QuerydslBindings bindings = new QuerydslBindings();
+		defaultCustomizer.customize(bindings, path);
 		findCustomizerForDomainType(customizer, domainType.getType()).customize(bindings, path);
 
 		return bindings;
@@ -151,9 +158,32 @@ public class QuerydslBindingsFactory implements ApplicationContextAware {
 		});
 	}
 
+	/**
+	 * Obtains registered {@link DefaultQuerydslBinderCustomizer} instances from the
+	 * {@link org.springframework.beans.factory.BeanFactory}.
+	 *
+	 * @return
+	 */
+	private QuerydslBinderCustomizer<EntityPath<?>> findDefaultCustomizer() {
+		return beanFactory.map(this::getDefaultQuerydslBinderCustomizer).orElse(NoOpCustomizer.INSTANCE);
+	}
+
+	private QuerydslBinderCustomizer<EntityPath<?>> getDefaultQuerydslBinderCustomizer(
+			AutowireCapableBeanFactory beanFactory) {
+
+		List<DefaultQuerydslBinderCustomizer> customizers = beanFactory
+				.getBeanProvider(DefaultQuerydslBinderCustomizer.class).stream().collect(Collectors.toList());
+
+		return (bindings, root) -> {
+			for (DefaultQuerydslBinderCustomizer defaultQuerydslBinderCustomizer : customizers) {
+				defaultQuerydslBinderCustomizer.customize(bindings, root);
+			}
+		};
+	}
+
 	/**
 	 * Obtains the {@link QuerydslBinderCustomizer} for the given domain type. Will inspect the given annotation for a
-	 * dedicatedly configured one or consider the domain types's repository.
+	 * dedicated configured one or consider the domain type's repository.
 	 *
 	 * @param annotation
 	 * @param domainType
@@ -194,7 +224,7 @@ public class QuerydslBindingsFactory implements ApplicationContextAware {
 		}).orElseGet(() -> BeanUtils.instantiateClass(type));
 	}
 
-	private static enum NoOpCustomizer implements QuerydslBinderCustomizer<EntityPath<?>> {
+	private enum NoOpCustomizer implements QuerydslBinderCustomizer<EntityPath<?>> {
 
 		INSTANCE;
 

src/test/java/org/springframework/data/querydsl/binding/QuerydslBindingsFactoryUnitTests.java

@@ -23,7 +23,9 @@ import java.util.Optional;
 
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+
 import org.springframework.beans.factory.config.AutowireCapableBeanFactory;
+import org.springframework.context.support.GenericApplicationContext;
 import org.springframework.data.querydsl.QUser;
 import org.springframework.data.querydsl.SimpleEntityPathResolver;
 import org.springframework.data.querydsl.User;
@@ -33,6 +35,7 @@ import org.springframework.data.util.TypeInformation;
 import org.springframework.test.util.ReflectionTestUtils;
 import org.springframework.web.servlet.ModelAndView;
 
+import com.querydsl.core.types.EntityPath;
 import com.querydsl.core.types.Path;
 import com.querydsl.core.types.Predicate;
 
@@ -95,6 +98,27 @@ class QuerydslBindingsFactoryUnitTests {
 		});
 	}
 
+	@Test // #206
+	@SuppressWarnings({ "unchecked", "rawtypes" })
+	void shouldApplyDefaultCustomizers() {
+
+		GenericApplicationContext context = new GenericApplicationContext();
+		context.registerBean(DefaultCustomizer.class);
+		context.refresh();
+
+		QuerydslBindingsFactory factory = new QuerydslBindingsFactory(SimpleEntityPathResolver.INSTANCE);
+		factory.setApplicationContext(context);
+
+		QuerydslBindings bindings = factory.createBindingsFor(USER_TYPE, SpecificBinding.class);
+		Optional<MultiValueBinding<Path<Object>, Object>> binding = bindings
+				.getBindingForPath(PropertyPathInformation.of("inceptionYear", User.class));
+
+		assertThat(binding).hasValueSatisfying(it -> {
+			Optional<Predicate> bind = it.bind((Path) QUser.user.inceptionYear, Collections.singleton(1L));
+			assertThat(bind).hasValue(QUser.user.inceptionYear.gt(1L));
+		});
+	}
+
 	@Test // DATACMNS-669
 	void rejectsPredicateResolutionIfDomainTypeCantBeAutoDetected() {
 
@@ -123,4 +147,14 @@ class QuerydslBindingsFactoryUnitTests {
 			bindings.bind(QUser.user.firstname).firstOptional((path, value) -> value.map(path::contains));
 		}
 	}
+
+	static class DefaultCustomizer implements DefaultQuerydslBinderCustomizer {
+
+		@Override
+		public void customize(QuerydslBindings bindings, EntityPath<?> root) {
+
+			bindings.bind(QUser.user.inceptionYear).first((path, value) -> QUser.user.inceptionYear.gt(value));
+		}
+	}
+
 }