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* 2 along with this work; if not, write to the Free Software Foundation,
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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.
* @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();
}
}
}