test/langtools/tools/javac/lambda/lambdaExpression/SamConversionComboTest.java - platform/libcore - Git at Google

 /*
  * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * 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).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */

 /**
  * @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.
  * @modules jdk.compiler
  */

 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.JavaFileManager;
 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")));

         DiagnosticChecker dc = new DiagnosticChecker();
         JavacTask ct = (JavacTask)comp.getTask(null, fm, dc, null, null, Arrays.asList(samSourceFile, clientSourceFile));
         try {
             ct.analyze();
         } catch (Exception e) {
             throw new AssertionError("failing SAM source file \n" + samSourceFile + "\n\n" + "failing client source file \n"+ clientSourceFile);
         }
         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;

     static JavaCompiler comp = ToolProvider.getSystemJavaCompiler();
     static JavaFileManager fm = comp.getStandardFileManager(null, null, null);

     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 {
         try {
             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);
         } finally {
             fm.close();
         }
     }
 }
	/*
	* Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* 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).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	/**
	* @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.
	* @modules jdk.compiler
	*/

	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.JavaFileManager;
	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")));

	DiagnosticChecker dc = new DiagnosticChecker();
	JavacTask ct = (JavacTask)comp.getTask(null, fm, dc, null, null, Arrays.asList(samSourceFile, clientSourceFile));
	try {
	ct.analyze();
	} catch (Exception e) {
	throw new AssertionError("failing SAM source file \n" + samSourceFile + "\n\n" + "failing client source file \n"+ clientSourceFile);
	}
	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;

	static JavaCompiler comp = ToolProvider.getSystemJavaCompiler();
	static JavaFileManager fm = comp.getStandardFileManager(null, null, null);

	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 {
	try {
	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);
	} finally {
	fm.close();
	}
	}
	}