├── README.md └── LICENSE /README.md: -------------------------------------------------------------------------------- 1 | [![Average time to resolve an issue](http://isitmaintained.com/badge/resolution/TrigerSoft/jaque.svg)](http://isitmaintained.com/project/TrigerSoft/jaque "Average time to resolve an issue") 2 | [![Maven Central](https://img.shields.io/maven-central/v/com.trigersoft/jaque.svg?label=Maven%20Central)](https://search.maven.org/search?q=g:%22com.trigersoft%22%20AND%20a:%22jaque%22) 3 | 4 | The project is discontinued, but inspired a [strong successor](https://github.com/streamx-co/ExTree). 5 | 6 | # JAva QUEry 7 | 8 | This library enables Java 8 Lambdas to be represented as objects in the form of expression trees at runtime: 9 | 10 | ```java 11 | void method(Predicate p) { 12 | LambdaExpression> parsed = LambdaExpression.parse(p); 13 | //Use parsed Expression Tree... 14 | } 15 | ``` 16 | 17 | making it possible to create type-safe fluent interfaces, i.e. instead of: 18 | 19 | ```java 20 | Customer obj = ... 21 | obj.property("name").eq("John") 22 | ``` 23 | 24 | one can write 25 | 26 | ```java 27 | method(obj -> obj.getName() == "John") 28 | ``` 29 | 30 | in type-safe, refactoring friendly manner. And then the library developer will be able to parse the produced Lambda to the corresponding Expression Tree for analysis. 31 | 32 | --- 33 | 34 | For example, [JPA Criteria API](http://docs.oracle.com/javaee/6/tutorial/doc/gjivm.html) could benefit a lot from using JaQue, e.g.: 35 | 36 | ```java 37 | //instead of this: 38 | Root pet = cq.from(Pet.class); 39 | Join owner = pet.join(Pet_.owners); 40 | 41 | //it could be this: 42 | Join owner = pet.join(Pet::getOwners); 43 | 44 | //and instead of this: 45 | query.where(pet.get(Pet_.color).isNull()); 46 | query.where(builder.equal(pet.get(Pet_.name), "Fido") 47 | .and(builder.equal(pet.get(Pet_.color), "brown"))); 48 | 49 | //it could be this: 50 | query.where(pet -> pet.getColor() == null); 51 | query.where(pet -> (pet.getName() == "Fido") && (pet.getColor() == "brown")); 52 | ``` 53 | 54 | If you are looking for an oportunity to start an open source project, implementing the above should be very beneficial for a very large developer comminuty. Should you start this or any other open source project based on JaQue, I'll be happy to [assist you](mailto://kostat@trigersoft.com). 55 | 56 | #### How to write fluent interface with JaQue? 57 | 58 | - Suppose you want to reference some class property 59 | 60 | ```java 61 | public class Fluent { 62 | 63 | // this interface is required to make the lambda Serializable, which removes a need for 64 | // jdk.internal.lambda.dumpProxyClasses system property. See below. 65 | public static interface Property extends Function, Serializable { 66 | } 67 | 68 | public Fluent property(Property propertyRef) { 69 | LambdaExpression> parsed = LambdaExpression 70 | .parse(propertyRef); 71 | Expression body = parsed.getBody(); 72 | Expression methodCall = body; 73 | 74 | // remove casts 75 | while (methodCall instanceof UnaryExpression) 76 | methodCall = ((UnaryExpression) methodCall).getFirst(); 77 | 78 | // checks are omitted for brevity 79 | Member member = ((MemberExpression) ((InvocationExpression) methodCall) 80 | .getTarget()).getMember(); 81 | 82 | // use member 83 | ... 84 | 85 | return this; 86 | } 87 | } 88 | ``` 89 | 90 | - Now your users will be able to write 91 | 92 | ```java 93 | Fluent f = new Fluent(); 94 | f.property(Customer::getName); 95 | ``` 96 | 97 | > Make the lambda Serializable, as shown in example above. If the lambda is not serializable, the [jdk.internal.lambda.dumpProxyClasses](https://bugs.openjdk.java.net/browse/JDK-8023524) system property must be set and point to an existing writable directory to give the parser access to the lambda byte code. 98 | 99 | #### Resources 100 | 101 | - [Full Docs](http://trigersoft.github.io/jaque) [(noframes)](http://trigersoft.github.io/jaque/overview-summary.html) 102 | - [Maven Artifact](http://search.maven.org/#search%7Cga%7C1%7Ca%3A%22jaque%22) 103 | - [Technical Details](https://github.com/TrigerSoft/jaque/wiki/Technical-Details) 104 | - [Quality Assurance and Continuous Integration](https://github.com/TrigerSoft/jaque/wiki/Quality-Assurance) 105 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. 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