DATACMNS-266 - Use new common Maven build infrastructure.

Simplified project setup to be a single module build again. Using Spring Data Build parent POM to simplify project setup. See https://github.com/SpringSource/spring-data-build#spring-data-build-infrastructure

src/main/java/org/springframework/data/querydsl/EntityPathResolver.java

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+/*
+ * Copyright 2011 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
+ *
+ *      http://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;
+
+import com.mysema.query.types.EntityPath;
+
+/**
+ * Strategy interface to abstract the ways to translate an plain domain class into a {@link EntityPath}.
+ * 
+ * @author Oliver Gierke
+ */
+public interface EntityPathResolver {
+
+	<T> EntityPath<T> createPath(Class<T> domainClass);
+}

src/main/java/org/springframework/data/querydsl/QueryDslPredicateExecutor.java

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+/*
+ * Copyright 2011 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
+ *
+ *      http://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;
+
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+
+import com.mysema.query.types.OrderSpecifier;
+import com.mysema.query.types.Predicate;
+
+/**
+ * Interface to allow execution of QueryDsl {@link Predicate} instances.
+ * 
+ * @author Oliver Gierke
+ */
+public interface QueryDslPredicateExecutor<T> {
+
+	/**
+	 * Returns a single entity matching the given {@link Predicate}.
+	 * 
+	 * @param spec
+	 * @return
+	 */
+	T findOne(Predicate predicate);
+
+	/**
+	 * Returns all entities matching the given {@link Predicate}.
+	 * 
+	 * @param spec
+	 * @return
+	 */
+	Iterable<T> findAll(Predicate predicate);
+
+	/**
+	 * Returns all entities matching the given {@link Predicate} applying the given {@link OrderSpecifier}s.
+	 * 
+	 * @param predicate
+	 * @param orders
+	 * @return
+	 */
+	Iterable<T> findAll(Predicate predicate, OrderSpecifier<?>... orders);
+
+	/**
+	 * Returns a {@link Page} of entities matching the given {@link Predicate}.
+	 * 
+	 * @param predicate
+	 * @param pageable
+	 * @return
+	 */
+	Page<T> findAll(Predicate predicate, Pageable pageable);
+
+	/**
+	 * Returns the number of instances that the given {@link Predicate} will return.
+	 * 
+	 * @param predicate the {@link Predicate} to count instances for
+	 * @return the number of instances
+	 */
+	long count(Predicate predicate);
+}

src/main/java/org/springframework/data/querydsl/QueryDslUtils.java

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+/*
+ * Copyright 2011 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
+ *
+ *      http://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;
+
+/**
+ * Utility class for Querydsl.
+ * 
+ * @author Oliver Gierke
+ */
+public abstract class QueryDslUtils {
+
+	public static final boolean QUERY_DSL_PRESENT = org.springframework.util.ClassUtils.isPresent(
+			"com.mysema.query.types.Predicate", QueryDslUtils.class.getClassLoader());
+
+	private QueryDslUtils() {
+
+	}
+}

src/main/java/org/springframework/data/querydsl/SimpleEntityPathResolver.java

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+/*
+ * Copyright 2011 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
+ *
+ *      http://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;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+
+import org.springframework.util.ClassUtils;
+import org.springframework.util.ReflectionUtils;
+
+import com.mysema.query.types.EntityPath;
+
+/**
+ * Simple implementation of {@link EntityPathResolver} to lookup a query class by reflection and using the static field
+ * of the same type.
+ * 
+ * @author Oliver Gierke
+ */
+public enum SimpleEntityPathResolver implements EntityPathResolver {
+
+	INSTANCE;
+
+	private static final String NO_CLASS_FOUND_TEMPLATE = "Did not find a query class %s for domain class %s!";
+	private static final String NO_FIELD_FOUND_TEMPLATE = "Did not find a static field of the same type in %s!";
+
+	/**
+	 * Creates an {@link EntityPath} instance for the given domain class. Tries to lookup a class matching the naming
+	 * convention (prepend Q to the simple name of the class, same package) and find a static field of the same type in
+	 * it.
+	 * 
+	 * @param domainClass
+	 * @return
+	 */
+	@SuppressWarnings("unchecked")
+	public <T> EntityPath<T> createPath(Class<T> domainClass) {
+
+		String pathClassName = getQueryClassName(domainClass);
+
+		try {
+			Class<?> pathClass = ClassUtils.forName(pathClassName, domainClass.getClassLoader());
+			Field field = getStaticFieldOfType(pathClass);
+
+			if (field == null) {
+				throw new IllegalStateException(String.format(NO_FIELD_FOUND_TEMPLATE, pathClass));
+			} else {
+				return (EntityPath<T>) ReflectionUtils.getField(field, null);
+			}
+
+		} catch (ClassNotFoundException e) {
+			throw new IllegalArgumentException(String.format(NO_CLASS_FOUND_TEMPLATE, pathClassName, domainClass.getName()),
+					e);
+		}
+	}
+
+	/**
+	 * Returns the first static field of the given type inside the given type.
+	 * 
+	 * @param type
+	 * @return
+	 */
+	private Field getStaticFieldOfType(Class<?> type) {
+
+		for (Field field : type.getDeclaredFields()) {
+
+			boolean isStatic = Modifier.isStatic(field.getModifiers());
+			boolean hasSameType = type.equals(field.getType());
+
+			if (isStatic && hasSameType) {
+				return field;
+			}
+		}
+
+		Class<?> superclass = type.getSuperclass();
+		return Object.class.equals(superclass) ? null : getStaticFieldOfType(superclass);
+	}
+
+	/**
+	 * Returns the name of the query class for the given domain class.
+	 * 
+	 * @param domainClass
+	 * @return
+	 */
+	private String getQueryClassName(Class<?> domainClass) {
+
+		String simpleClassName = ClassUtils.getShortName(domainClass);
+		return String.format("%s.Q%s%s", domainClass.getPackage().getName(), getClassBase(simpleClassName),
+				domainClass.getSimpleName());
+	}
+
+	/**
+	 * Analyzes the short class name and potentially returns the outer class.
+	 * 
+	 * @param shortName
+	 * @return
+	 */
+	private String getClassBase(String shortName) {
+
+		String[] parts = shortName.split("\\.");
+
+		if (parts.length < 2) {
+			return "";
+		}
+
+		return parts[0] + "_";
+	}
+}

src/main/java/org/springframework/data/querydsl/package-info.java

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+/**
+ * Querydsl integration support classes.
+ * 
+ * @see http://www.querydsl.com
+ */
+package org.springframework.data.querydsl;