public void testWriteAnonymousClass() {
// final List<String> baz = Arrays.asList("foo", "bar");
// new AbstractList<String>() {
// public int size() {
// return baz.size();
// }
// public String get(int index) {
// return ((String) baz.get(index)).toUpperCase();
// }
// }
final ParameterExpression bazParameter =
Expressions.parameter(Types.of(List.class, String.class), "baz");
final ParameterExpression indexParameter = Expressions.parameter(Integer.TYPE, "index");
BlockExpression e =
Expressions.block(
Expressions.declare(
Modifier.FINAL,
bazParameter,
Expressions.call(
Arrays.class,
"asList",
Arrays.<Expression>asList(
Expressions.constant("foo"), Expressions.constant("bar")))),
Expressions.statement(
Expressions.new_(
Types.of(AbstractList.class, String.class),
Collections.<Expression>emptyList(),
Arrays.<MemberDeclaration>asList(
Expressions.fieldDecl(
Modifier.PUBLIC | Modifier.FINAL,
Expressions.parameter(String.class, "qux"),
Expressions.constant("xyzzy")),
Expressions.methodDecl(
Modifier.PUBLIC,
Integer.TYPE,
"size",
Collections.<ParameterExpression>emptyList(),
Blocks.toFunctionBlock(
Expressions.call(
bazParameter, "size", Collections.<Expression>emptyList()))),
Expressions.methodDecl(
Modifier.PUBLIC,
String.class,
"get",
Arrays.asList(indexParameter),
Blocks.toFunctionBlock(
Expressions.call(
Expressions.convert_(
Expressions.call(
bazParameter,
"get",
Arrays.<Expression>asList(indexParameter)),
String.class),
"toUpperCase",
Collections.<Expression>emptyList())))))));
assertEquals(
"{\n"
+ " final java.util.List<String> baz = java.util.Arrays.asList(\"foo\", \"bar\");\n"
+ " new java.util.AbstractList<String>(){\n"
+ " public final String qux = \"xyzzy\";\n"
+ " public int size() {\n"
+ " return baz.size();\n"
+ " }\n"
+ "\n"
+ " public String get(int index) {\n"
+ " return ((String) baz.get(index)).toUpperCase();\n"
+ " }\n"
+ "\n"
+ " };\n"
+ "}\n",
Expressions.toString(e));
}
@Override
void accept(ExpressionWriter writer, int lprec, int rprec) {
// "new Function1() {
// public Result apply(T1 p1, ...) {
// <body>
// }
// // bridge method
// public Object apply(Object p1, ...) {
// return apply((T1) p1, ...);
// }
// }
//
// if any arguments are primitive there is an extra bridge method:
//
// new Function1() {
// public double apply(double p1, int p2) {
// <body>
// }
// // box bridge method
// public Double apply(Double p1, Integer p2) {
// return apply(p1.doubleValue(), p2.intValue());
// }
// // bridge method
// public Object apply(Object p1, Object p2) {
// return apply((Double) p1, (Integer) p2);
// }
List<String> params = new ArrayList<String>();
List<String> bridgeParams = new ArrayList<String>();
List<String> bridgeArgs = new ArrayList<String>();
List<String> boxBridgeParams = new ArrayList<String>();
List<String> boxBridgeArgs = new ArrayList<String>();
for (ParameterExpression parameterExpression : parameterList) {
final Type parameterType = parameterExpression.getType();
final Type parameterBoxType = Types.box(parameterType);
final String parameterBoxTypeName = Types.className(parameterBoxType);
params.add(parameterExpression.declString());
bridgeParams.add(parameterExpression.declString(Object.class));
bridgeArgs.add("(" + parameterBoxTypeName + ") " + parameterExpression.name);
boxBridgeParams.add(parameterExpression.declString(parameterBoxType));
boxBridgeArgs.add(
parameterExpression.name
+ (Primitive.is(parameterType)
? "." + Primitive.of(parameterType).primitiveName + "Value()"
: ""));
}
Type bridgeResultType = Functions.FUNCTION_RESULT_TYPES.get(this.type);
if (bridgeResultType == null) {
bridgeResultType = body.getType();
}
Type resultType2 = bridgeResultType;
if (bridgeResultType == Object.class
&& !params.equals(bridgeParams)
&& !(body.getType() instanceof TypeVariable)) {
resultType2 = body.getType();
}
String methodName = getAbstractMethodName();
writer
.append("new ")
.append(type)
.append("()")
.begin(" {\n")
.append("public ")
.append(Types.className(resultType2))
.list(" " + methodName + "(", ", ", ") ", params)
.append(Blocks.toFunctionBlock(body));
// Generate an intermediate bridge method if at least one parameter is
// primitive.
if (!boxBridgeParams.equals(params)) {
writer
.append("public ")
.append(Types.boxClassName(bridgeResultType))
.list(" " + methodName + "(", ", ", ") ", boxBridgeParams)
.begin("{\n")
.list("return " + methodName + "(\n", ",\n", ");\n", boxBridgeArgs)
.end("}\n");
}
// Generate a bridge method. Argument types are looser (as if every
// type parameter is set to 'Object').
//
// Skip the bridge method if there are no arguments. It would have the
// same overload as the regular method.
if (!bridgeParams.equals(params)) {
writer
.append("public ")
.append(Types.boxClassName(bridgeResultType))
.list(" " + methodName + "(", ", ", ") ", bridgeParams)
.begin("{\n")
.list("return " + methodName + "(\n", ",\n", ");\n", bridgeArgs)
.end("}\n");
}
writer.end("}\n");
}
