DATACMNS-669 - Added support to bind Querydsl Predicates to Spring MVC controllers.

Adding @QuerydslPredicate to a parameter within SpringMVC Controller when having registered the QueryDslPredicateArgumentResolver allows to generate a Querydsl Predicate based on the request parameters.

Parameters will be converted into their corresponding property types before using the as predicate value. Given more than one attribute will connect those using 'and'. Collections of values will force usage of 'in' while single values on collection like properties result in 'contains'.

The base type for building the Querydsl Path is extracted from the methods return type. In case of non domain type return values it can optionally be specified via @QueydslPredicate(root = …). Specific Predicate conversions can be registered via '@QuerydslSpecification'.

This allows to sneak in specific property path handlings more easily.

new QueryDslPredicateSpecification() {
  {
    define(new StringPath("address.city"), (path, value) -> path.like(value.toString()));
  }
};

Renamed resolver, accessor etc. to express operation of binding properties to a resolved path and introduced explicit binding context which allows reuse of predicate builder within the ArgumentResolver.

Added registration of QuerydslPredicateArgumentResolver directly in SpringDataWebConfiguration reusing the provided ConversionService.

Added Javadoc and changed visibility of non public API and types.

Original pull request: #132.

src/test/java/org/springframework/data/querydsl/Address.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2015 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.annotations.QueryEntity;
+
+/**
+ * @author Christoph Strobl
+ */
+@QueryEntity
+public class Address {
+	String street;
+	String city;
+}

src/test/java/org/springframework/data/querydsl/User.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2014 the original author or authors.
+ * Copyright 2011-2015 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.
@@ -16,16 +16,23 @@
 package org.springframework.data.querydsl;
 
 import java.util.Date;
+import java.util.List;
 
 import com.mysema.query.annotations.QueryEntity;
 
 /**
  * @author Oliver Gierke
  * @author Thomas Darimont
+ * @author Christoph Strobl
  */
 @QueryEntity
 public class User {
+
 	String firstname;
 	String lastname;
 	Date dateOfBirth;
+
+	Address address;
+	List<String> nickNames;
+	Long inceptionYear;
 }