Moved QueryDslPredicateExecutor into Spring Data Commons.

spring-data-commons-core/src/main/java/org/springframework/data/querydsl/QueryDslPredicateExecutor.java

@@ -0,0 +1,79 @@
+/*
+ * 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);
+}