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support Guava functions by APT
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t2v/guavapt
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Guavapt isGuava Functional Idioms support with APT.
Funcito is so cool!However Funcito does not support final classes.
Since we want to use@Value annotation ofLombok, we create guavapt.
Add@Guavapt annotation into your bean class.
packagemy.cool.lib;importjava.util.List;importjp.t2v.guavapt.Guavapt;@GuavaptpublicclassCompany {privatefinalintid;privatefinalStringname;privatefinalList<Employee>employees;privatefinalbooleanlisted;publicCompany(intid,Stringname,List<Employee>employees,booleanlisted) {this.id =id;this.name =name;this.employees =employees;this.listed =listed; }publicintgetId() {returnid; }publicStringgetName() {returnname; }publicList<Employee>getEmployees() {returnemployees; }publicbooleanisListed() {returnlisted; }publicbooleanhasEmployee() {return !employees.isEmpty(); }}
You can use Functions and Predicates as follows.
List<Company>companies = ...List<Integer>listedCompanyIds =FluentIterable.from(companies) .filter(CompanyPredicates.isListed) .transform(CompanyFunctions.getId) .toList();
packagemy.cool.lib;importcom.google.common.base.Function;publicclassCompanyFunctions {privateCompanyFunctions() {}publicstaticfinalFunction<Company,java.lang.Integer>getId =newFunction<Company,java.lang.Integer>() {@Overridepublicjava.lang.Integerapply(finalCompanyinput) {returninput.getId(); } };publicstaticfinalFunction<Company,java.lang.String>getName =newFunction<Company,java.lang.String>() {@Overridepublicjava.lang.Stringapply(finalTestEntityinput) {returninput.getName(); } };publicstaticfinalFunction<Company,java.util.List<my.cool.lib.Employee>>getEmployees =newFunction<Company,java.util.List<my.cool.lib.Employee>>() {@Overridepublicjava.util.List<my.cool.lib.Employee>apply(finalCompanyinput) {returninput.getEmployees(); } };publicstaticfinalFunction<Company,java.lang.Boolean>isListed =newFunction<Company,java.lang.Boolean>() {@Overridepublicjava.lang.Booleanapply(finalCompanyinput) {returninput.isListed(); } };publicstaticfinalFunction<Company,java.lang.Boolean>hasEmployee =newFunction<Company,java.lang.Boolean>() {@Overridepublicjava.lang.Booleanapply(finalCompanyinput) {returninput.hasEmployee(); } };}
and
packagemy.cool.lib;importcom.google.common.base.Predicate;publicclassCompanyPredicates {privateCompanyPredicates() {}publicstaticfinalPredicate<Company>isListed =newPredicate<Company>() {@Overridepublicbooleanapply(finalCompanyinput) {returninput.isListed(); } };publicstaticfinalPredicate<Company>hasEmployee =newPredicate<Company>() {@Overridepublicbooleanapply(finalCompanyinput) {returninput.hasEmployee(); } };}
@Guavapt annotation can take parametes.
@Guavapt(functions =true,predicates =false)
When functions is true, Guavapt generate functions class.
When predicates is true, Guavapt generate predicates class.
You can change class name suffix of generated class.
addguavapt.f.suffix orguavapt.p.suffix processor options.
for example
javac -cp guavapt.jar -s -Aguavapt.f.suffix=Foo -Aguavapt.p.suffix=Bar my/cool/lib/Company.javaGavapt generateCompanyFoo andCompanyBar insted ofCompanyFunctions andCampanyPredicates
This library is released under the Apache Software License, version 2, which should be included with the source in a file named LICENSE.