Mercurial > jdk8-mips64-public > langtools / file revision

 /*

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  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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  * published by the Free Software Foundation.

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  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

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 /**

  * @test

  * @bug 8003280

  * @summary Add lambda tests

  *   Test SAM conversion of lambda expressions in combinations of different contexts,

  *           lambda body types(statement/expression), explict/implicit target type etc, to verify

  *           SAM conversion being conducted successfully as expected.

  */

 import com.sun.source.util.JavacTask;

 import java.net.URI;

 import java.util.Arrays;

 import javax.tools.Diagnostic;

 import javax.tools.JavaCompiler;

 import javax.tools.JavaFileObject;

 import javax.tools.SimpleJavaFileObject;

 import javax.tools.ToolProvider;

 public class SamConversionComboTest {

     enum FInterface {

         A("A", "interface A { Integer m(int i); }"),

         B("B", "interface B { int m(Integer i); }"),

         C("C", "interface C { int m(Integer i) throws Exception; }");

         String interfaceType;

         String interfaceDef;

         FInterface(String interfaceType, String interfaceDef) {

             this.interfaceType = interfaceType;

             this.interfaceDef = interfaceDef;

         }

         String getParameterType() {

             switch(this) {

             case A:

                 return "int";

             case B:

             case C:

                 return "Integer";

             default:

                 return null;

             }

         }

     }

     enum Context {

         ASSIGNMENT("#FType f = #LBody;"),

         METHOD_CALL("void method1(#FType f) { }\n" +

                     "    void method2() {\n" +

                     "        method1(#LBody);\n" +

                     "    }"),

         CONSTRUCTOR("X x = new X(#LBody);"),

         RETURN_OF_METHOD("#FType method1() {\n" +

                          "    return #LBody;\n" +

                          "}"),

         ARRAY_INITIALIZER("Object[] oarray = {\"a\", 1, (#FType)#LBody};"),

         LAMBDA_BODY("#FType f = n -> ((#FType)#LBody).m(n);"),

         CAST("void test() throws Exception { int n = ((#FType)#LBody).m(1); }"),

         CONDITIONAL_EXPRESSION("#FType f = 2 > 1 ? #LBody : null;");

         String context;

         Context(String context) {

             this.context = context;

         }

         String getContext(FInterface f, LambdaKind lk, LambdaBody lb, ReturnValue rv) {

             return context.replace("#FType", f.interfaceType).replace("#LBody", lb.getLambdaBody(f, lk, rv));

         }

     }

     enum LambdaKind {

         EXPRESSION("#VAL"),

         STATEMENT("{return #VAL;}"),

         EXCEPTION_STMT("{throw new Exception();}");

         String stmt;

         LambdaKind(String stmt) {

             this.stmt = stmt;

         }

     }

     enum ReturnValue {

         INT("i + 1"),

         INTEGER("new Integer(i+1)"),

         INT2("i.intValue() + 1"),

         STRING("i + \"\""),

         DOUBLE("i * 1.0");

         String rValue;

         ReturnValue(String rValue) {

             this.rValue = rValue;

         }

     }

     enum LambdaBody {

         IMPLICIT("i -> #RET"),//type inferred

         EXPLICIT("(#Type i) -> #RET");//explicit type

         String bodyStr;

         LambdaBody(String bodyStr) {

             this.bodyStr = bodyStr;

         }

         String getLambdaBody(FInterface fi, LambdaKind lk, ReturnValue rv) {

             return bodyStr.replace("#Type", fi.getParameterType()).replace("#RET", lk.stmt.replace("#VAL", rv.rValue));

         }

     }

     boolean checkSamConversion() {

         if(lambdaKind != LambdaKind.EXCEPTION_STMT && (returnValue == ReturnValue.DOUBLE || returnValue == ReturnValue.STRING)) //return type mismatch

             return false;

         if(context != Context.CONSTRUCTOR) {//context other than construcotr argument

             if(fInterface != FInterface.C && lambdaKind == LambdaKind.EXCEPTION_STMT)

                 return false;

             if(fInterface == FInterface.A && returnValue == ReturnValue.INT2)

                 return false;

         }

         else { //constructor argument context

             //match X(A a) or X(B b) or X(C c)

             if (lambdaKind == LambdaKind.EXCEPTION_STMT) {

                 return false; //ambiguous target type

             }

             else if(lambdaBody == LambdaBody.IMPLICIT) {

                 return false;

             }

             else { //explicit parameter type

                 if(fInterface.getParameterType().equals("Integer")) //ambiguous target type

                 //e.g. X x = new X((Integer i) -> i + 1);

                     return false;

                 if(returnValue == ReturnValue.INT2)

                 //e.g. X x = new X(int i -> i.intValue() + 1);

                     return false;

             }

         }

         return true;

     }

     SourceFile samSourceFile = new SourceFile("FInterface.java", "#C") {

         public String toString() {

             String interfaces = "";

             for(FInterface fi : FInterface.values())

                 interfaces += fi.interfaceDef + "\n";

             return template.replace("#C", interfaces);

         }

     };

     String clientTemplate = "class Client {\n" +

                             "    #Context\n" +

                             "}\n\n" +

                             "class X {\n" +

                             "    int value = 0;\n\n" +

                             "    X(A a) {\n" +

                             "        value = a.m(6);\n" +

                             "    }\n\n" +

                             "    X(B b) {\n" +

                             "        value = b.m(7);\n" +

                             "    }\n\n" +

                             "    X(C c) {\n" +

                             "        try {\n" +

                             "            value = c.m(8);\n" +

                             "        } catch (Exception e){}\n" +

                             "    }\n" +

                             "}";

     SourceFile clientSourceFile = new SourceFile("Client.java", clientTemplate) {

         public String toString() {

             return template.replace("#Context", context.getContext(fInterface, lambdaKind, lambdaBody, returnValue));

         }

     };

     void test() throws Exception {

         System.out.println("\n====================================");

         System.out.println(fInterface + ", " +  context + ", " + lambdaKind + ", " + lambdaBody + ", " + returnValue);

         System.out.println(samSourceFile + "\n");

         String clientFileStr = clientSourceFile.toString();

         System.out.println(clientFileStr.substring(0, clientFileStr.indexOf("\n\n")));

         final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();

         DiagnosticChecker dc = new DiagnosticChecker();

         JavacTask ct = (JavacTask)tool.getTask(null, null, dc, null, null, Arrays.asList(samSourceFile, clientSourceFile));

         ct.analyze();

         if (dc.errorFound == checkSamConversion()) {

             throw new AssertionError(samSourceFile + "\n\n" + clientSourceFile);

         }

         count++;

     }

     abstract class SourceFile extends SimpleJavaFileObject {

         protected String template;

         public SourceFile(String filename, String template) {

             super(URI.create("myfo:/" + filename), JavaFileObject.Kind.SOURCE);

             this.template = template;

         }

         @Override

         public CharSequence getCharContent(boolean ignoreEncodingErrors) {

             return toString();

         }

         public abstract String toString();

     }

     static class DiagnosticChecker implements javax.tools.DiagnosticListener<JavaFileObject> {

         boolean errorFound = false;

         public void report(Diagnostic<? extends JavaFileObject> diagnostic) {

             if (diagnostic.getKind() == Diagnostic.Kind.ERROR) {

                 errorFound = true;

             }

         }

     }

     FInterface fInterface;

     Context context;

     LambdaBody lambdaBody;

     LambdaKind lambdaKind;

     ReturnValue returnValue;

     static int count = 0;

     SamConversionComboTest(FInterface f, Context c, LambdaBody lb, LambdaKind lk, ReturnValue rv) {

         fInterface = f;

         context = c;

         lambdaKind = lk;

         lambdaBody = lb;

         returnValue = rv;

     }

     public static void main(String[] args) throws Exception {

         for(Context ct : Context.values()) {

             for (FInterface fi : FInterface.values()) {

                 for (LambdaKind lk: LambdaKind.values()) {

                     for (LambdaBody lb : LambdaBody.values()) {

                         for(ReturnValue rv : ReturnValue.values()) {

                             new SamConversionComboTest(fi, ct, lb, lk, rv).test();

                         }

                     }

                 }

             }

         }

         System.out.println("total tests: " + count);

     }

 }